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Is there a way to determine if a <select> dropdown menu is open?

- by Robert

I'm looking for a way to determine if/when a <select> element's menu is open. I don't need to force it to open or close, just figure out if it's open or closed at a given time. I can listen to events for focus/blur, mouseup/mousedown, etc., but I don't think I can reliably figure out the state of the menu from those events. For example, mousedown followed by mouseup could mean the user clicked and dragged to a selection and released (in which case the menu is now closed) or clicked and released to open the menu (in which case the menu is open). It also seems likely that the specific behavior of dropdown menus is browser-dependent. I know I could do this if I roll my own dropdown menu, but I prefer to use <select>. Is there a reliable way to find out if a dropdown menu is open? Or is this something that Javascript can't know?

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Error when trying to refer to a field by name

- by raja

I am getting an error (document.my_formm.fieldName.value is null or not an object) from the below code: <html> <head> <title>(Type a title for your page here)</title> <script language=JavaScript> function check_length(my_formm,fieldName) { alert(fieldName); alert(document.my_formm.fieldName.value); } </script> </head> <body> <form name=my_form method=post> <input type="text" onChange=check_length("my_form","my_text"); name=my_text rows=4 cols=30 value=""> <br> <input size=1 value=50 name=text_num> Characters Left </form> </body> </html>

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Which event handler to use to record leaving page - onunload or onbeforeunload?

- by symcbean

Hi all, Having not any answers to my previous questions about using javascript to measure page turn times, I'm going to start writing my own code (!). To measure the length of tie it takes, I'm proposing dropping a cookie containing a timestamp when the user browses away from a page, then in a subsequent page, comparing that time with 'now' and sending back a request to a URL which will log the interval. It seems that there are 2 possible handlers I could associate the first block of code with - the onunload() handler or the onbeforeunload()? It's more important that it fail silently on browsers with no/broken support for the handler, than it be portable across every possible browser. Any pointers? Gotchas? TIA C.

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IE Display bug - solved when using the "developer tools"?

- by nute

I have some Javascript/CSS issues with IE (no suprises?). So when I see the error in IE8, I go to Tools Developer Tools. Then I navigate to the correct DIV. I click on it, look around ... then I look again at my page, and the problem is fixed! This makes debugging pretty difficult... To see the display error, go to http://www.makemeheal.com/mmh/home.do in IE, and look at the "Your Recent History" module.

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accessing and modifying tab opened using window.open in google chrome

- by sonofdelphi

I used to be able to this to create an exported HTML page containing some data. But the code is not working with the latest version of Google Chrome (It works alright with Chrome 5.0.307.11 beta and all other major browsers). function createExport(text) { var target = window.open(); target.title = 'Memonaut - Exported View'; target.document.open(); target.document.write(text); target.document.close(); } Chrome now complains that the domains don't match and disallows the Javascript calls as unsafe. How can I access and modify the document of a newly opened browser-tab in such a scenario?

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Style common group of divs in one css statement.

- by Vafello

I have a few divs created dynamically in Javascript.I was wondering if it is possible to style them all at once. #somediv { background-color: #F2F5FC; border-style:solid; border-bottom:thin dotted #33ccff; } #somediv2 { background-color: #F2F5FC; border-style:solid; border-bottom:thin dotted #33ccff; } ...and so on (this can be even 50 divs) I would like to change this to something like: #somediv* { background-color: #F2F5FC; border-style:solid; border-bottom:thin dotted #33ccff; }

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Fade out text value inside of text field using jQuery

- by Dwayne

I am not entirely sure if this is possible or not, I am pretty knowledgeable when it comes to jQuery and JavaScript in general, but this one has me stumped. I've created a simple plugin that clears a text input on focus and then displays the default value if nothing has been entered. Is it possible to fade out just the text itself inside of the text input, and not the whole field itself? All attempts seem to result in the text field itself fading out and eventually hiding the element from view. I did come up with a solution of using spans containing the default value and absolutely positioning them over the text input, hiding and showing them depending if a user has entered any text or not. I would much rather a much straightforward approach if one exists.

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2d parabolic projectile

- by ndg

I'm looking to create a basic Javascript implementation of a projectile that follows a parabolic arc (or something close to one) to arrive at a specific point. I'm not particularly well versed when it comes to complex mathematics and have spent days reading material on the problem. Unfortunately, seeing mathematical solutions is fairly useless to me. I'm ideally looking for pseudo code (or even existing example code) to try to get my head around it. Everything I find seems to only offer partial solutions to the problem. In practical terms, I'm looking to simulate the flight of an arrow from one location (the location of the bow) to another. It strikes me there are two distinct problems here: determining the position of interception between the projectile and a (moving) target, and then calculating the trajectory of the projectile. Any help would be greatly appreciated.

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Using jQuery to find keywords in string

- by Nic Hubbard

In php, I have used preg_match_all() to find keywords (using the format %keyword%) in a string, which works wonderfully and returns an array of all found keywords. What I would like to do, is do the same thing using jQuery or javascript. I have tried using the filter() function, and it kind of works. But I think I am missing something. How can I find ALL instances of the keyword in a string, using a regex? Here is what I have worked out so far: $("[id^='editableContent-']").filter(function() { alert($(this).html().match(/\%(.*?)\%/)); }); Any suggestions are welcome!

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Posting null values via AJAX

- by nickf

Using the jQuery $.post function, if you send a null value, it arrives at the server side as "null". Example: Javascript: $.post('test.php', { foo : null }); PHP: var_dump($_POST['foo']); // string(4) "null" I understand why this is so, but was wondering the best way to work around the limitation? Should you: Loop through all the variables in JS before you send them and replace with an empty string? Interpret "null" as null on the server side? Don't send the variable at all? Something else?

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Can not get json response using $.getJSON

- by Mellon

I am currently developing a Ruby on rails 3 application. My server controller function render a json object as response: class DaysController < BaseController ... def the_days ... render :json => days end end In my javascript,I use the following code to get json response from server( that's from the_day function in controller) $.getJSON( url, {emp_id: emp_id}, function(data) { var result = data.response; alert(result) alert(data) }, "json" ); I use firefox browswer and checked with Firebug, in Firebug Net-XHR, I see the Get request is successful, and the response "days" is there. That's both request and response are successful. But I did not see the two alert window defined in the above $.getJSON function, why? Why I can not get the response "days" in $.getJSON function??

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Resolve URL's for ASP.NET in jQuery?

- by TruMan1

I would like to use "~/" and resolve on the client site. For example, I would want to do this: <a href="~/page.aspx">website link</a> <img src="~/page.aspx" /> I would have my base URL's in ASP.NET like this: <script type="text/javascript"> var baseUrl = "<%= ResolveUrl("~/") %>"; </script> Would I need a jQuery plugin for this or can this be a achieved with a chained command?

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GZipping CSS and JS files

- by Ryan Giglio

I'm using YSlow to improve the speed of my site, and I'm having trouble with the "compress components with gzip" grade. I have this in my .htaccess file: SetOutputFilter DEFLATE AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css application/x-javascript But YSlow is saying There are 4 plain text components that should be sent compressed * http://crewinyourcode.com/css/reset.css * http://crewinyourcode.com/css/inner-pages/index.css * http://crewinyourcode.com/script/css/jquery-ui-1.8.custom.css * http://crewinyourcode.com/js/inner-pages/index.js How can I gzip the css and js files? Also...I don't have access to the httpd.conf file.

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How do polymorphic inline caches work with mutable types?

- by kingkilr

A polymorphic inline cache works by caching the actual method by the type of the object, in order to avoid the expensive lookup procedures (usually a hashtable lookup). How does one handle the type comparison if the type objects are mutable (i.e. the method might be monkey patched into something different at run time). The one idea I've come up with would be a "class counter" that gets incremented each time a method is adjusted, however this seems like it would be exceptionally expensive in a heavily monkey patched environ since it would kill all the PICs for that class, even if the methods for them weren't altered. I'm sure there must be a good solution to this, as this issue is directly applicable to Javascript and AFAIK all 3 of the big JS VMs have PICs (wow acronym ahoy).

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Standalone jQuery "touch" method?

- by dclowd9901

So, I'm looking to implement the ability for a plugin I wrote to read a touch "swipe" from a touch-capable internet device, like an iPhone, iPad or android. Is there anything out there? I'm not looking for something as full as jQtouch, though was considering reverse engineering the code I would need out of it. Any suggestions on the best way to approach this? A snippet of code already available? Addendum: I realize in hindsight the solution won't strictly be jQuery, as I'm pretty sure there aren't any built-in methods to handle this. I would expect standard Javascript to find itself in the answer.

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local match kickoff time

- by Usagi Dreamy

I'm working on a sports website and need to convert the server's match start time to local match start time. After much googling, I figured the fastest and most accurate way is to get the GMT offset value in JavaScript. The trouble is, I can't pass the GMT offset value to PHP. I've tried using both the PHP session and cookie variables, but both are always empty. The website doesn't require a user account, so there isn't any stored GMT value in the database. I'm trying to auto-detect each user's local timezone every time he/she visits the website, and then calculate the local match start time based on the timezone offset. Can someone please advise me? Thanks.

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set div position to fixed after scrolling 100px?

- by user1481850

I tried to use the following function in order to set the div's position to 100 px from top after scrolling 100 px. <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> $(window).scroll(function(){ $("#header").css("top",Math.max(0,100-$(this).scrollTop())); }); </script> <div class="header" style="position:fixed;top:100px;background-color:red">something</div> it is not working(the div stick to it's fixed position). it seems that the function is not relating to the div. what is my problem ?

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How to output JavaScript with PHP

- by krishna

Hi, I am new to PHP. I need to output the following JavaScript with PHP. This is my code: <html> <body> <?php echo "<script type="text/javascript">"; echo "document.write("Hello World!")"; echo "</script>"; ?> </body> </html> But it's showing the error: Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /var/www/html/workbench/person/script.php on line 4 Can anyone please help? I also need some simple tutorials on how to use PHP, HTML and JavaScript for an application.

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Updating Silverlight with data. JSON or WCF?

- by Alastair Pitts

We will be using custom Silverlight 4.0 controls on our ASP.NET MVC web page to display data from our database and was wondering what the most efficient method was? We will be having returned values of up to 100k records (of 2 properties per record). We have a test that uses the HTML Bridge from Javascript to Silverlight. First we perform a post request to a controller action in the MVC web app and return JSON. This JSON is then passed to the Silverlight where it is parsed and the UI updated. This seems to be rather slow, with the stored procedure (the select) taking about 3 seconds and the entire update in the browser about 10-15sec. Having a brief look on the net, it seems that WCF is another option, but not having used it, I wasn't sure of it's capability or suitability. Does anyone have any experiences or recommendations?

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Aggregating and Displaying Multiple Feeds

- by Keith

I want to pull feeds for multiple online services (e.g. Tumblr, Google Reader, Delicious) and aggregate them into a single feed to display on my site. I know of services like YQL or Yahoo! Pipes which will combine feeds, but sometimes those services are too slow. I was wondering what the best method would be if I wanted to run this on my own server (using JavaScript or PHP)? Ideally, I would cache the results to cut down on processing.

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Facebook Iframe App in Safari links to home page. Works OK in other Browsers.

- by Bathan

I have a facebook iframe that has several php files in it. In all tested browsers (IE,FFOX,Chrome) the links on the header work fine and go to the php files inside the iframe. When I tried this on Safari the links are reloading the whole app inside the iframe. Is like a recursive call because Its not like im having the home page reloaded inside the iframe but the whole facebook page WITH the iframe.. reloaded inside my iframe. The links are called using javascript with document.location.href="myPage.php"; Tryed placing target "_self" inside the link but this turned out weird : the iframe page was placed on top of everything, as if I had specified "_parent" on the target. Any help?

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Hiding/Unhiding Control in Gridview’s column - shifting problem

- by lupital

This is a follow up to my previous question: link text In gridview's column i have a linkbutton and a label under it. I want to hide/unhide label when linkbutton is clicked. I use javascript because i don't want any postbacks. The code: protected void gvwComments_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { LinkButton lButton = ((LinkButton)e.Row.Cells[2].FindControl("lbtnExpand")); Label label = ((Label)e.Row.Cells[2].FindControl("lblBody")); lButton.Attributes.Add("onclick", string.Format("HideLabel('{0}'); return false;", label.ClientID)); } } function HideLabel(button) { var rowObj = document.getElementById(button); if (rowObj.style.display == "none") { rowObj.style.display = "block"; } else { rowObj.style.display = "none"; } } The problem is that when I unhide the label by clicking on button, linkbutton is shifted a a bit upper it's original position in the cell. Is it possible to preserve linkbutton's position in the gridviews cell?

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Evaluation of jQuery function variable value during definition of that function

- by thesnail

I have a large number of rows in a table within which I wish to attach a unique colorpicker (jQuery plugin) to each cell in a particular column identified by unique ids. Given this, I want to automate the generation of instances of the colorpicker as follows: var myrows={"a","b","c",.....} var mycolours={"ffffff","fcdfcd","123123"...} for (var i=0;i<myrows.length;i++) { $("#"+myrows[i]+"colour").ColorPicker({flat: false, color: mycolours[i], onChange: function (hsb, hex, rgb) { $("#"+myrows[i]+"currentcolour").css('backgroundColor', '#' + hex); } }); Now this doesn't work because the evaluation of the $("#"+myrows[i]+"currentcolour") component occurs at the time the function is called, not when it is defined (which is want I need). Given that this plugin javascript appends its code to the level and not to the underlying DOM component that I am accessing above so can't derive what id this pertains to, how can I evaluate the variable during function declaration/definition? Thanks for any help/insight anyone can give. Brian.

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Creating a custom widget using django for use on external sites

- by ajt

I have a new site that I am putting together and part of it has statistics for the site's users. I would like to create a widget that others can use on another website by invoking javascript that reads data from my server and shows that statistics for a given user, but I am having a hard time finding specific tutorials that covers this in django. I have seen the link at Alex Maradon's site [0], but it looks to me like that is passing html back to the widget and I am having a hard time figuring out how to do this using something like xml. Are there any django apps for doing this or does anyone know of good how-tos? [0] http://alexmarandon.com/articles/web_widget_jquery/

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Collect DOM elements from external HTML documents

- by sonofdelphi

I am trying to write a report-generator to collect user-comments from a list of external HTML files. User-comments are wrapped in < span elements. Can this be done using JavaScript? Here's my attempt: function generateCommentReport() { var files = document.querySelectorAll('td a'); //Files to scan are links in an HTML table var outputWindow = window.open(); //Output browser window for report for(var i = 0; i<files.length; i++){ //Open each file in a browser window win = window.open(); win.location.href = files[i].href; //Scan opened window for 'comment's comments = win.document.getElementsByName('comment'); for(var j=0;j<comments.length;j++){ //Add to output report outputWindow.document.write(comment[i].innerHTML); } } }

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