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  • Safari extension - Too many injected scripts responding to message

    - by Philipp
    Hi, I am trying to code a safari extension similar to Bubble Translate for Chrome. when you click a button on the toolbar, it automatically translates the text currently selected to the language of your choice using the Google language API. I use the following injected script to get the highlighted text and display the result (as an alert for the time being): http://pastebin.com/bYVuQAmp I use the following global script to call the injected script if neccessary: hxxp://pastebin.com/VHaAKM5a The problem I have is the following: The script does not just get injected into the main page but also into ads and similar stuff that is embedded into the page. Due to that, the selected text gets translated multiple times because all the embedded scripts in one page respond to the message. How can I make sure that the script is injected only into the right page or only the right page responds? Thank you, Philipp

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  • PHP JSON encode output number as string

    - by mitch
    I am trying to output a JSON string using PHP and MySQL but the latitude and longitude is outputting as a string with quotes around the values. This causes an issue when I am trying to add the markers to a google map. Here is my code: $sql = mysql_query('SELECT * FROM markers WHERE address !=""'); $results = array(); while($row = mysql_fetch_array($sql)) { $results[] = array( 'latitude' =>$row['lat'], 'longitude' => $row['lng'], 'address' => $row['address'], 'project_ID' => $row['project_ID'], 'marker_id' => $row['marker_id'] ); } $json = json_encode($results); echo "{\"markers\":"; echo $json; echo "}"; Here is the expected output: {"markers":[{"latitude":0.000000,"longitude":0.000000,"address":"2234 2nd Ave, Seattle, WA","project_ID":"7","marker_id":"21"}]} Here is the output that I am getting: {"markers":[{"latitude":"0.000000","longitude":"0.000000","address":"2234 2nd Ave, Seattle, WA","project_ID":"7","marker_id":"21"}]} Notice the quotes around the latitude and longitude values.

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  • Asynchronous Silverlight WCF callback

    - by Matt
    I've created my own WCF service and I've successfully been able to talk to it via my Silverlight client. I ran into an interesting problem on my asynchronous callbacks though. When my callback is invoked, I can't update any UI controls with the dreaded invalid cross thread access Here's what my callback function looks like private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { lblDisplay.Text = e.Object.ToString(); } A quick google search showed me that I have to do this instead. private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { Dispatcher.BeginInvoke( () => lblDisplay.Text = e.Object.ToString() ); } Now everything works fine, but I wasn't expecting my callback to be running on a different thread. Will I always have to use the Dispatcher class in order to modify anything within my class or is this just limited to UI elements? I've not familiar with the Dispatcher class at all so I'm looking to understand it more.

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  • Is there a tool for generating a DSL parser that does not require a runtime for the resultant parser

    - by Chris
    I'm doing a lot of work with a DSLs at the moment and was wondering if anyone knew of a tool that could generate a parser for my bnf specification that does not require a run-time library (pure java source parser)? I'm committed to using XTEXT for a future Eclipse plug-in but I need a nice small version for my library itself and don't want to add another jar dependency. It seems that ANTLR requires a run-time to parse files and I performed a Google search with no avail. Can anyone help out? Thanks, Chris

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  • IE HTTPS Ajax request image not showing up

    - by Sha Le
    Hi: In IE (7 or 8) and HTTPS mode, following RESPONSE is delivered for an AJAX request. My issue is the img was NOT requested at all by IE (figured out using Fiddler), broken img is shown instead. It all works perfectly in HTTP mode in IE and other browsers no problem rendering in both mode (please don't tell me not to use IE). Any thoughts/work-arounds/suggestions? Thanks. <div> <h1>Chart Title</h1> <h2>Chart sub-title</h2> <img src="https://www.google.com/chart?cht=p3&chd=t:106,169,73,14&chds=0,169&chs=300x150&chtt=Ocean+Area&chdl=Atlantic|Pacific|Indian|Arctic&chma=0,0,0,0|70&chco=3366CC|DC3912|FF9900|109618&chp=4.7"> <p>message comes here</p> </div>

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  • Look of the app - Py2exe / wxPython

    - by Francisco Aleixo
    So my problem is the look and feel from my application, as it looks like an old look app. It is an wxPython application, and on python it runs fine and looks fine, but when I convert it to .exe using py2exe, the look is just bad. Now I know that if you are using XP you need some manifest to correct it but I am in other circumstances. I'm using Windows 7, and I'm using Python 2.6 (Yes, I am including the DLL's and the Microsoft.VC90.CRT.manifest). So my question is how can I solve this under these circumstances? NOTE: I tried to search on google, but the posts I found were rather old with people using XP and older python versions so I assumed it would be different? EDIT: Screenshots Normal (wanted look) : http://img80.imageshack.us/img80/3157/70762988.png Py2exe (unwanted look) : http://img687.imageshack.us/img687/6581/53608742.jpg

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  • XCode 3.2 does not mark unit test assert failures in the editor

    - by Cliff
    I've been off in Java land for about a month or so and now, upon returning to XCode I feel lost. I've upgraded 1st to 3.1.2 then recently to 3.2 and also got a new Mac with Snow Leopard so I'm not exactly sure when the problem surfaced. I just know that I used to get little red bubbles in my unit test next to the failing asserts and that no longer seems to happen. Is there a way to restore this? I've been trying to use Apple's own SenTesting framework instead of GoogleTools for mac like I used to. Should I revert to Google Tools? Does anyone have an answer?

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  • What web based programming environments exist, on which to learn?

    - by jjclarkson
    I loved appjet (the programming environment) before it was taken over by Google. What other web based complete programming environments are out there? Which one do you think is best for starting to do real world coding the fastest? I really think coding from your browser will make programming more accessible to the public. Are there any out there that use a vim style, (e.g. jsvi) in combination with free server side hosting? The last time I looked at Bespin it was a little green. Are there others?

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  • error about django to connecct newes mssql2008

    - by qq263020776
    I am using django-mssql and SQL Server 2008, but I found that it always errors when I do some commands,for example: python manage.py syncdb the error is below: raise OperationalError(e, "Error opening connection: " + connection_string) ngo.db.backends.sqlserver_ado.dbapi.OperationalError: (com_error(-2147352567, xb7\xa2\xc9\xfa\xd2\xe2\xcd\xe2\xa1\xa3', (0, u'Microsoft OLE DB Provider for L Server', u'[DBNETLIB][ConnectionOpen (Connect()).]SQL Server \u4e0d \u5b58\u 8\u6216\u62d2\u7edd\u8bbf\u95ee\u3002', None, 0, -2147467259), None), 'Error ning connection: PROVIDER=SQLOLEDB;DATA SOURCE=115.238.106.100,60433;Network rary=DBMSSOCN;Initial Catalog=rvdb_1;UID=sa;PWD=xxxx') When I use Microsoft SQL Server Management studio client, I can successfully connect the database. I got some infomation from: http://code.google.com/p/django-mssql/issues/detail?id=76 but I still tried I got wrong and I think the solution provided is wrong.

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  • CodePlex Daily Summary for Saturday, December 08, 2012

    CodePlex Daily Summary for Saturday, December 08, 2012Popular ReleasesYnote Classic: Ynote Classic version 1.0: Ynote Classic is a text editor made by SS Corporation. It can help you write code by providing you with different codes for creation of html or batch files. You can also create C/C++ /Java files with SS Ynote Classic. Author of Ynote Classic is Samarjeet Singh. Ynote Classic is available with different themes and skins. It can also compile *.bat files into an executable file. It also has a calculator built within it. 1st version released of 6-12-12 by Samarjeet Singh. Please contact on http:...Http Explorer: httpExplorer-1.1: httpExplorer now has the ability to connect to http server via web proxies. The proxy may be explicitly specified by hostname or IP address. Or it may be specified via the Internet Options settings of Windows. You may also specify credentials to pass to the proxy if the proxy requires them. These credentials may be NTLM or basic authentication (clear text username and password).Bee OPOA Platform: Bee OPOA Demo V1.0.001: Initial version.Microsoft Ajax Minifier: Microsoft Ajax Minifier 4.78: Fix for issue #18924 - using -pretty option left in ///#DEBUG blocks. Fix for issue #18980 - bad += optimization caused bug in resulting code. Optimization has been removed pending further review.Torrents-List Organizer: Torrents-list organizer v 0.5.0.0: ????? ? ?????? 0.5.0.0: 1) ????? ? ?????? ?????? ??????????? ???????? ?????????? ? ?????? ????????. ??????????????, ????????? ???????, ??? ????????? ???????? ?????? ("???????? ?? ??????"). 2) ????????? ???????? ???????? ???????-??????. ????? ??????, ?????? ??? ?????? ?????????????? ??? ???????-?????. 3) ?????? ??? ??????? ??????? ?????? ? ????? ????????????? ?????????? ???????????, ? ?????????????, ??????? ?????? ????? ?????? ??????????, ?????????? ???? ??????? ???? ?????? ???????? ??????? ? ...fastJSON: v2.0.11: - bug fix single char number json - added UseEscapedUnicode parameter for controlling string output in \uxxxx for unicode/utf8 format - bug fix null and generic ToObject<>() - bug fix List<> of custom typesMedia Companion: MediaCompanion3.508b: Recommended Download - Fixes IMDB title scrape bug and several mc_com movie and actor cache bugs.Measure It: MeasureIt v0.2.1: Updated with lots of bug fixes and support for interactive measurements in LinqPadPeriodic.Net: 0.8: Whats new for Periodic.Net 0.8: New Element Info Dialog New Website MenuItem Minor Bug Fix's, improvements and speed upsYahoo! UI Library: YUI Compressor for .Net: Version 2.2.0.0 - Epee: New : Web Optimization package! Cleaned up the nuget packages BugFix: minifying lots of files will now be faster because of a recent regression in some code. (We were instantiating something far too many times).DtPad - .NET Framework text editor: DtPad 2.9.0.40: http://dtpad.diariotraduttore.com/files/images/flag-eng.png English + A new built-in editor for the management of CSV files, including the edit of cells, deleting and adding new rows, replacement of delimiter character and much more (issue #1137) + The limit of rows allowed before the decommissioning of their side panel has been raised (new default: 1.000) (issue #1155, only partially solved) + Pressing CTRL+TAB now DtPad opens a screen that shows the list of opened tabs (issue #1143) + Note...AvalonDock: AvalonDock 2.0.1746: Welcome to the new release of AvalonDock 2.0 This release contains a lot (lot) of bug fixes and some great improvements: Views Caching: Content of Documents and Anchorables is no more recreated everytime user move it. Autohide pane opens really fast now. Two new themes Expression (Dark and Light) and Metro (both of them still in experimental stage). If you already use AD 2.0 or plan to integrate it in your future projects, I'm interested in your ideas for new features: http://avalondock...AcDown?????: AcDown????? v4.3.2: ??●AcDown??????????、??、??、???????。????,????,?????????????????????????。???????????Acfun、????(Bilibili)、??、??、YouTube、??、???、??????、SF????、????????????。 ●??????AcPlay?????,??????、????????????????。 ● AcDown??????????????????,????????????????????????????。 ● AcDown???????C#??,????.NET Framework 2.0??。?????"Acfun?????"。 ?? v4.3.2?? ?????????????????? ??Acfun??????? ??Bilibili?????? ??Bilibili???????????? ??Bilibili????????? ??????????????? ???? ??Bilibili??????? ????32??64? Windows XP/...ExtJS based ASP.NET 2.0 Controls: FineUI v3.2.2: ??FineUI ?? ExtJS ??? ASP.NET 2.0 ???。 FineUI??? ?? No JavaScript,No CSS,No UpdatePanel,No ViewState,No WebServices ???????。 ?????? IE 7.0、Firefox 3.6、Chrome 3.0、Opera 10.5、Safari 3.0+ ???? Apache License 2.0 (Apache) ???? ??:http://fineui.com/bbs/ ??:http://fineui.com/demo/ ??:http://fineui.com/doc/ ??:http://fineui.codeplex.com/ ???? +2012-12-03 v3.2.2 -?????????????,?????button/button_menu.aspx(????)。 +?Window????Plain??;?ToolbarPosition??Footer??;?????FooterBarAlign??。 -????win...Player Framework by Microsoft: Player Framework for Windows Phone 8: This is a brand new version of the Player Framework for Windows Phone, available exclusively for Windows Phone 8, and now based upon the Player Framework for Windows 8. While this new version is not backward compatible with Windows Phone 7 (get that http://smf.codeplex.com/releases/view/88970), it does offer the same great feature set plus dozens of new features such as advertising, localization support, and improved skinning. Click here for more information about what's new in the Windows P...SSH.NET Library: 2012.12.3: New feature(s): + SynchronizeDirectoriesQuest: Quest 5.3 Beta: New features in Quest 5.3 include: Grid-based map (sponsored by Phillip Zolla) Changable POV (sponsored by Phillip Zolla) Game log (sponsored by Phillip Zolla) Customisable object link colour (sponsored by Phillip Zolla) More room description options (by James Gregory) More mathematical functions now available to expressions Desktop Player uses the same UI as WebPlayer - this will make it much easier to implement customisation options New sorting functions: ObjectListSort(list,...Chinook Database: Chinook Database 1.4: Chinook Database 1.4 This is a sample database available in multiple formats: SQL scripts for multiple database vendors, embeded database files, and XML format. The Chinook data model is available here. ChinookDatabase1.4_CompleteVersion.zip is a complete package for all supported databases/data sources. There are also packages for each specific data source. Supported Database ServersDB2 EffiProz MySQL Oracle PostgreSQL SQL Server SQL Server Compact SQLite Issues Resolved293...RiP-Ripper & PG-Ripper: RiP-Ripper 2.9.34: changes FIXED: Thanks Function when "Download each post in it's own folder" is disabled FIXED: "PixHub.eu" linksD3 Loot Tracker: 1.5.6: Updated to work with D3 version 1.0.6.13300New ProjectsAqui Estoy ( IP announcing Tool): Aqui Estoy its a tool that once installed on a computer announces its IP to another computer, so it can be localized, it can be used to find computer that have a dinamic IP. Developed with vb.net and sockets technology. Bing Maps for Windows Store Apps Training Kit: This training kit consists of a power point slide deck which gives an overview of how to create a Windows Store App that uses Bing Maps. BTFramework: Beauty Code FrameworkCAML Builder: Small and simple API which allows you to easily write CAML queries, in a declarative way.Easy sound: Easy sound is a .net tool for managing audio stream in the memory. It joins existing wav streams into single one using different method.EBusiness: Little Prototype of an education ProjectField Validator: Silverlight 3 Field Validator finalproject: Web 2.0 project about Real Madrid Community.fossilGui: Gui for fossil (http://www.fossil-scm.org)HubLog: Tool for application administrator: collects and joins logs from multiple instances of an application, and displays them. Example of usage in C#: the telnet protocol, dynamically compiled functions as elements of configuration.Implementing Google Protocol Buffers using C#: Demonstration for Implementing Google Protocol Buffers using C# Jarvis PSO Course Project: Project for the course Programmazione di Sistema taught @ Politecnico di TorinoL3374tw: Translates text into L337log4net Dynamics CRM 2011 Appender: log4net Dynamics CRM 2011 AppenderNote Garden: Note Garden is my extension to NodeGarden (http://alphalabs.codeplex.com) for Windows Phone 8, using Silverlight. NV2: This library will support playback of v2m files.Paste As Plugin For Windows Live Writer: The Paste As Plugin for Windows Live Writer is a simple plugin which steamlines the pasting of text and HTML into a WLW post.PMS_LSI: PMS LSIPoker Calculator: Monte Poker is poker utility which calculates probabilities of handspostleitzahlensuche: Postleitzahlen Suche C# WPF Applikation; Suche nach Postleitzahlen oder Orten => Liefert als Ergebnis eine Liste von übereinstimmenden Orten mit deren PLZsPythagorean Theorem in WPF: This project shows off using the Pythagorean Theorem in a simple drawing WPF Application. Measuring the distance between 2 objects in WPF can easily be achieved using this approach.Resource management language: This project is a try to create an automata-based resource management language in C#. Resource management means the work with computational resources (possibly threads, processors) in order to execute a program.Resource-Based Economy: A .Net framework to help with the implementation of a global Resource-Based Economy.Sinbiota 2.0 prototype: SinBiota 2.0 prototype is an open source biodiversity information system, which allows the presentation of biodiversity data through an enhanced GIS framework.Snapword: Work in progress.UISandbox: UISandbox is a sample C# source code showing how to deal with plugins requiring sandbox, when those plugins must interact with WPF application interface (classically display child controls inside application window).UnitFundProfitability: This program helps to calculate real profitability of your investments in unit funds. It knows about markdown rate, markup rate, taxes and other payments, which decrease declaring profitability.Z3 Test Suite: Test suite for the Z3 theorem prover.

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  • Is there a standard Java utility to parse XSD files at runtime?

    - by Andrew
    I've been looking around for a way to programmatically parse XSD files to generate an XML mapping so that I can take any XSD file and create a parser that will parse any XML file that conforms to it, and my google-fu has been coming up short. XSOM looks promising, as it will parse an XSD file and make all its attributes available in a straight forward way. Are there any other options or standard libraries available that will produce an XML file parser from an XSD file? [Conclusion] Thanks everyone for your responses, they were a real help. I was able to write implementations using JAXP, Eclipses EMF and in XSOM that all worked as desired. JAXP was very straight forward and easy to learn and do. EMF was actually a pain to get going properly, there were so many jars that had to be included for it to work standalone that I would not recommend it. XSOM was even simpler than the JAXP implementation, so I went with it in the end.

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  • wsimport and Android or any other ProxyGenerator for android?

    - by Shoaib Shaikh
    I am currently developing an Android app i previously developed for IPhone. My Backend is built using WCF service with basichttpEndpoint, i also enabled RESTful methods for better support with other Mobile platforms as well. Now i want to access my existing WCF service(SOAP/REST endpoint) on Android but i need some good ProxyGenerator to consume my services. I just google around for some solution and i found wsimport and wsdl2java(Axis) are two options in java domain. But i am still unable to find any solution related to Android. Can anyone suggest me the best practice in such scenario?

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  • UnauthorizedAccessException cannot resolve Directory.GetFiles failure

    - by Ric Coles
    Hi all, Directory.GetFiles method fails on the first encounter with a folder it has no access rights to. The method throws an UnauthorizedAccessException (which can be caught) but by the time this is done, the method has already failed/terminated. The code I am using is listed below: try { // looks in stated directory and returns the path of all files found getFiles = Directory.GetFiles(@directoryToSearch, filetype, SearchOption.AllDirectories); } catch (UnauthorizedAccessException) { } As far as I am aware, there is no way to check beforehand whether a certain folder has access rights defined. In my example, I'm searching on a disk across a network and when I come across a root access only folder, my program fails. I have searched for a few days now for any sort of resolve, but this problem doesn't seem to be very prevalent on here or Google. I look forward to any suggestions you may have, Regards

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  • Socksifying a Java ServerSocket - how to approach

    - by Thorbjørn Ravn Andersen
    I would like to have a Java program running on network A have a ServerSocket living on another network B through a proxy. I have played with a SOCKS5 proxy (which works) but it appears that all the proxy facilities in Java only work with client connections, not with ServerSockets (no constructor taking a Proxy argument). Asking Google gives much hay and few needles. What is the approach I should take to get this running? If a specific client is better than a generic SOCKS or web proxy then fine, but it needs to be Java (that leaves sshd out). Target JVM is preferrably Java 5, and then Java 6.

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  • How to order <script> tags vs. <style> tags in HTML markup for best results.

    - by Tchalvak
    I'm building up my site over at http://royronalds.com, and I'm trying to figure out what order of elements in the <head> makes most sense. Just to take from what I current have, I have: <head> <style> external stylesheet <meta> <title> <link> to favicon <script> for jQuery <script> main javascript for site <script> google analytics, asynchronous script. </head> Are there reasons to order these differently so that load times and other issues happen more smoothly, and if so, what would the ideal order be?

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  • Error connecting to SQL Server 2008 with Django

    - by qq263020776
    I am using django-mssql and SQL Server 2008, but I found that it always errors when I do some commands,for example: python manage.py syncdb the error is below: raise OperationalError(e, "Error opening connection: " + connection_string) ngo.db.backends.sqlserver_ado.dbapi.OperationalError: (com_error(-2147352567, xb7\xa2\xc9\xfa\xd2\xe2\xcd\xe2\xa1\xa3', (0, u'Microsoft OLE DB Provider for L Server', u'[DBNETLIB][ConnectionOpen (Connect()).]SQL Server \u4e0d \u5b58\u 8\u6216\u62d2\u7edd\u8bbf\u95ee\u3002', None, 0, -2147467259), None), 'Error ning connection: PROVIDER=SQLOLEDB;DATA SOURCE=115.238.106.100,60433;Network rary=DBMSSOCN;Initial Catalog=rvdb_1;UID=sa;PWD=xxxx') When I use Microsoft SQL Server Management studio client, I can successfully connect the database. I got some infomation from: http://code.google.com/p/django-mssql/issues/detail?id=76 but I still tried I got wrong and I think the solution provided is wrong.

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  • Combining deflate and minify - am i creating overhead?

    - by Mark Nolan
    I minify my css and js files on the fly with google.codes minify. I have also set my .htaccess to use deflate on all my css and js files - the reason beeing some js files (like shadowbox and tinymce) reference to other js files in the code. So i'm compressing with apache deflate and also minify compresses some js and css files with gzip - am i creating overhead by doing this - first gzipping (minify) and then zlib (deflate) will run through again. Or will apache deflate ignore the already gzipped files having the attributes set by minify in the headers. Anyone have any experiences with this?

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  • Amazon AWS s3fs mount problem on Fedora 14

    - by Alex
    I successfully compiled and installed s3fs (http://code.google.com/p/s3fs/) on my Fedora 14 machine. I included the password credentials in /etc/ as specified in the guide. When I run: sudo /usr/bin/s3fs bucket_name /mnt/bucket_name/ it runs successfully. (note: the bucket name is the same as the folder name in /mnt/). When I run ls in /mnt/ I get the error "ls: cannot access bucket_name: Permission denied". When I run sudo chmod 640 /mnt/bucket_name I get "chmod: changing permissions of `bucket_name': Input/output error". When I reboot the machine I can access the folder /mnt/bucket_name normally but it is not mapped to the s3 bucket. So, basically I have two questions. 1) How do I access the folder (/mnt/bucket_name) as usual after I mount it to the s3 bucket and 2) How can I keep it mounted even after machine restart. Regards

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  • Ruby Error: "No such file or directory -- script/generate (LoadError)"

    - by Jenius
    Hey all, I know that this error has been discussed elsewhere on the web, and this may seem like a stupid question, but I've got a very strange situation on my hands here. I'm running on Snow Leopard, with fully updated ruby and rails gems. I created a new rails project (ruby new testing), then navigated into that folder (cd ~/testing), and tried to create a basic scaffolding (ruby script/generate scaffold newtest name:string), and I got this error back: "ruby: No such file or directory -- script/generate (LoadError)" I have searched google thoroughly and tried to implement every solution that I could, but nothing has been working. I don't understand why I have this error or how to fix it. Can anyone help me, please?

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  • sharepoint approval workflow loop

    - by Sachin
    Hi All, I am trying to set up a Approval workflow when item created and item updated event on a list and then update the approval status as workflow complete. Now when I create a new Item the workflow kicks off as expected. When I edit the same item and approve the item new workflow get started as the item get edit. It seems to be workflow falls in loop if I se an Approval workflow on new item created and Item Edit events. I Google for it and I found that Microsoft has come up with hotfix to overcome this issue. I have installed it on my machine but still the problem persist. Is there are any prerequisites needed for this ? or any other service pack or specific version of service pack needs be installed on machine to make this hotfix running. Can any one tell me how shold I overcome this issue...? Thanks in Advance Sachin

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  • Detecting HTML5/CSS3 Features using Modernizr

    - by dwahlin
    HTML5, CSS3, and related technologies such as canvas and web sockets bring a lot of useful new features to the table that can take Web applications to the next level. These new technologies allow applications to be built using only HTML, CSS, and JavaScript allowing them to be viewed on a variety of form factors including tablets and phones. Although HTML5 features offer a lot of promise, it’s not realistic to develop applications using the latest technologies without worrying about supporting older browsers in the process. If history has taught us anything it’s that old browsers stick around for years and years which means developers have to deal with backward compatibility issues. This is especially true when deploying applications to the Internet that target the general public. This begs the question, “How do you move forward with HTML5 and CSS3 technologies while gracefully handling unsupported features in older browsers?” Although you can write code by hand to detect different HTML5 and CSS3 features, it’s not always straightforward. For example, to check for canvas support you need to write code similar to the following:   <script> window.onload = function () { if (canvasSupported()) { alert('canvas supported'); } }; function canvasSupported() { var canvas = document.createElement('canvas'); return (canvas.getContext && canvas.getContext('2d')); } </script> If you want to check for local storage support the following check can be made. It’s more involved than it should be due to a bug in older versions of Firefox. <script> window.onload = function () { if (localStorageSupported()) { alert('local storage supported'); } }; function localStorageSupported() { try { return ('localStorage' in window && window['localStorage'] != null); } catch(e) {} return false; } </script> Looking through the previous examples you can see that there’s more than meets the eye when it comes to checking browsers for HTML5 and CSS3 features. It takes a lot of work to test every possible scenario and every version of a given browser. Fortunately, you don’t have to resort to writing custom code to test what HTML5/CSS3 features a given browser supports. By using a script library called Modernizr you can add checks for different HTML5/CSS3 features into your pages with a minimal amount of code on your part. Let’s take a look at some of the key features Modernizr offers.   Getting Started with Modernizr The first time I heard the name “Modernizr” I thought it “modernized” older browsers by added missing functionality. In reality, Modernizr doesn’t actually handle adding missing features or “modernizing” older browsers. The Modernizr website states, “The name Modernizr actually stems from the goal of modernizing our development practices (and ourselves)”. Because it relies on feature detection rather than browser sniffing (a common technique used in the past – that never worked that great), Modernizr definitely provides a more modern way to test features that a browser supports and can even handle loading additional scripts called shims or polyfills that fill in holes that older browsers may have. It’s a great tool to have in your arsenal if you’re a web developer. Modernizr is available at http://modernizr.com. Two different types of scripts are available including a development script and custom production script. To generate a production script, the site provides a custom script generation tool rather than providing a single script that has everything under the sun for HTML5/CSS3 feature detection. Using the script generation tool you can pick the specific test functionality that you need and ignore everything that you don’t need. That way the script is kept as small as possible. An example of the custom script download screen is shown next. Notice that specific CSS3, HTML5, and related feature tests can be selected. Once you’ve downloaded your custom script you can add it into your web page using the standard <script> element and you’re ready to start using Modernizr. <script src="Scripts/Modernizr.js" type="text/javascript"></script>   Modernizr and the HTML Element Once you’ve add a script reference to Modernizr in a page it’ll go to work for you immediately. In fact, by adding the script several different CSS classes will be added to the page’s <html> element at runtime. These classes define what features the browser supports and what features it doesn’t support. Features that aren’t supported get a class name of “no-FeatureName”, for example “no-flexbox”. Features that are supported get a CSS class name based on the feature such as “canvas” or “websockets”. An example of classes added when running a page in Chrome is shown next:   <html class=" js flexbox canvas canvastext webgl no-touch geolocation postmessage websqldatabase indexeddb hashchange history draganddrop websockets rgba hsla multiplebgs backgroundsize borderimage borderradius boxshadow textshadow opacity cssanimations csscolumns cssgradients cssreflections csstransforms csstransforms3d csstransitions fontface generatedcontent video audio localstorage sessionstorage webworkers applicationcache svg inlinesvg smil svgclippaths"> Here’s an example of what the <html> element looks like at runtime with Internet Explorer 9:   <html class=" js no-flexbox canvas canvastext no-webgl no-touch geolocation postmessage no-websqldatabase no-indexeddb hashchange no-history draganddrop no-websockets rgba hsla multiplebgs backgroundsize no-borderimage borderradius boxshadow no-textshadow opacity no-cssanimations no-csscolumns no-cssgradients no-cssreflections csstransforms no-csstransforms3d no-csstransitions fontface generatedcontent video audio localstorage sessionstorage no-webworkers no-applicationcache svg inlinesvg smil svgclippaths">   When using Modernizr it’s a common practice to define an <html> element in your page with a no-js class added as shown next:   <html class="no-js">   You’ll see starter projects such as HTML5 Boilerplate (http://html5boilerplate.com) or Initializr (http://initializr.com) follow this approach (see my previous post for more information on HTML5 Boilerplate). By adding the no-js class it’s easy to tell if a browser has JavaScript enabled or not. If JavaScript is disabled then no-js will stay on the <html> element. If JavaScript is enabled, no-js will be removed by Modernizr and a js class will be added along with other classes that define supported/unsupported features. Working with HTML5 and CSS3 Features You can use the CSS classes added to the <html> element directly in your CSS files to determine what style properties to use based upon the features supported by a given browser. For example, the following CSS can be used to render a box shadow for browsers that support that feature and a simple border for browsers that don’t support the feature: .boxshadow #MyContainer { border: none; -webkit-box-shadow: #666 1px 1px 1px; -moz-box-shadow: #666 1px 1px 1px; } .no-boxshadow #MyContainer { border: 2px solid black; }   If a browser supports box-shadows the boxshadow CSS class will be added to the <html> element by Modernizr. It can then be associated with a given element. This example associates the boxshadow class with a div with an id of MyContainer. If the browser doesn’t support box shadows then the no-boxshadow class will be added to the <html> element and it can be used to render a standard border around the div. This provides a great way to leverage new CSS3 features in supported browsers while providing a graceful fallback for older browsers. In addition to using the CSS classes that Modernizr provides on the <html> element, you also use a global Modernizr object that’s created. This object exposes different properties that can be used to detect the availability of specific HTML5 or CSS3 features. For example, the following code can be used to detect canvas and local storage support. You can see that the code is much simpler than the code shown at the beginning of this post. It also has the added benefit of being tested by a large community of web developers around the world running a variety of browsers.   $(document).ready(function () { if (Modernizr.canvas) { //Add canvas code } if (Modernizr.localstorage) { //Add local storage code } }); The global Modernizr object can also be used to test for the presence of CSS3 features. The following code shows how to test support for border-radius and CSS transforms:   $(document).ready(function () { if (Modernizr.borderradius) { $('#MyDiv').addClass('borderRadiusStyle'); } if (Modernizr.csstransforms) { $('#MyDiv').addClass('transformsStyle'); } });   Several other CSS3 feature tests can be performed such as support for opacity, rgba, text-shadow, CSS animations, CSS transitions, multiple backgrounds, and more. A complete list of supported HTML5 and CSS3 tests that Modernizr supports can be found at http://www.modernizr.com/docs.   Loading Scripts using Modernizr In cases where a browser doesn’t support a specific feature you can either provide a graceful fallback or load a shim/polyfill script to fill in missing functionality where appropriate (more information about shims/polyfills can be found at https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-Browser-Polyfills). Modernizr has a built-in script loader that can be used to test for a feature and then load a script if the feature isn’t available. The script loader is built-into Modernizr and is also available as a standalone yepnope script (http://yepnopejs.com). It’s extremely easy to get started using the script loader and it can really simplify the process of loading scripts based on the availability of a particular browser feature. To load scripts dynamically you can use Modernizr’s load() function which accepts properties defining the feature to test (test property), the script to load if the test succeeds (yep property), the script to load if the test fails (nope property), and a script to load regardless of if the test succeeds or fails (both property). An example of using load() with these properties is show next: Modernizr.load({ test: Modernizr.canvas, yep: 'html5CanvasAvailable.js’, nope: 'excanvas.js’, both: 'myCustomScript.js' }); In this example Modernizr is used to not only load scripts but also to test for the presence of the canvas feature. If the target browser supports the HTML5 canvas then the html5CanvasAvailable.js script will be loaded along with the myCustomScript.js script (use of the yep property in this example is a bit contrived – it was added simply to demonstrate how the property can be used in the load() function). Otherwise, a polyfill script named excanvas.js will be loaded to add missing canvas functionality for Internet Explorer versions prior to 9. Once excanvas.js is loaded the myCustomScript.js script will be loaded. Because Modernizr handles loading scripts, you can also use it in creative ways. For example, you can use it to load local scripts when a 3rd party Content Delivery Network (CDN) such as one provided by Google or Microsoft is unavailable for whatever reason. The Modernizr documentation provides the following example that demonstrates the process for providing a local fallback for jQuery when a CDN is down:   Modernizr.load([ { load: '//ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.js', complete: function () { if (!window.jQuery) { Modernizr.load('js/libs/jquery-1.6.4.min.js'); } } }, { // This will wait for the fallback to load and // execute if it needs to. load: 'needs-jQuery.js' } ]); This code attempts to load jQuery from the Google CDN first. Once the script is downloaded (or if it fails) the function associated with complete will be called. The function checks to make sure that the jQuery object is available and if it’s not Modernizr is used to load a local jQuery script. After all of that occurs a script named needs-jQuery.js will be loaded. Conclusion If you’re building applications that use some of the latest and greatest features available in HTML5 and CSS3 then Modernizr is an essential tool. By using it you can reduce the amount of custom code required to test for browser features and provide graceful fallbacks or even load shim/polyfill scripts for older browsers to help fill in missing functionality. 

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  • The "Why" behind PMD's rules.

    - by James Kingsbery
    Is there a good resource which describes the "why" behind PMD rule sets? PMD's site has the "what" - what each rule does - but it doesn't describe why PMD has that rule and why ignoring that rule can get you in trouble in the real world. In particular, I'm interested in knowing why PMD has the AvoidInstantiatingObjectsInLoops and OnlyOneReturn rules (the first seems necessary if you need to create a new object corresponding to each object in a collection, the second seems like it is a necessity in many cases that return a value based on some criteria). Just to be clear, I know that I can disable these and how to do that, I'm just wondering why they are there in the first place. Sorry if there's something obvious I missed out there, but I did a Google search and SO search before posting this.

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  • Collaborative text editing in a web application

    - by UmYeah
    I have a group of writers around the world all trying to work on one story. I want them to be able to work with each other like they would on google documents, but from within our application. Specifically, being able to see who else is working on the document and what they are changing in real time. Something like an embedded etherpad. Are there any good solutions out in the wild? Im sure building something like this would be a significant project.

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  • Modifying setup file with PHP

    - by Paul Lammertsma
    I have an application that needs branding when downloaded in certain continents. When installed in North America, for instance, the application, when run, displays a different logo and company name than in Europe. The setup file is provided through a PHP script. Presently there is a Inno Setup executable for Windows and a DMG for Mac OS X. I have seen that when downloading Google Chrome, you can specify whether or not it should send usage statistics. A brief look at the JavaScript that controls it reveals that this is simply sent back to the server with &usagestats=0 or &usagestats=1. How would I go about influencing the installation based upon settings specified via the PHP download page?

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  • Inter Widget Communication for iGoogle like portals

    - by bakore
    I was looking for a platform where widgets developed using various technologies like Java can communicate with each other. In other words When I add widgets to an interface I need them to talk to each other. For example A Click event in one widget should trigger an event in some other widget. I have been looking into the web for solutions and ways to do it, but couldnt find anything concrete. Any pointers or information on this would be great. Something like this http://blogs.sun.com/pdblog/entry/inter_widget_communication_in_cross Google also had a gadget to gadget communication API which was deprecated last year.

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