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  • How to get started with embedded systems in the airline or submarine industries?

    - by Jason
    Hi, Not 100% sure how to frame this question but here goes... I currently work as a Rails developer but want to work on more substancial / "meaty" projects and have always been very interested in embedded systems, especially systems that run on aircraft and especially submarines.....I know strange combination. I have been doing some searching & found lockheed martin produces a lot of underwater systems for various navys around the world e.g. http://www.naval-technology.com/projects/nssn/ However, there is very little information about what software is used within these systems, what OS's they use or anything else "technical", presume there is a lot of C / C++ involved but that is just a guess... so its hard to know where to even begin learning what is required to potential work in these areas. Just wondering if anyone has any experiance working with or more information about embeddeed systems in either the airline (onboard flight systems) or especially submarine systems? Thanks!

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  • How to decide on what hardware to deploy web application

    - by Yuval A
    Suppose you have a web application, no specific stack (Java/.NET/LAMP/Django/Rails, all good). How would you decide on which hardware to deploy it? What rules of thumb exist when determining how many machines you need? How would you formulate parameters such as concurrent users, simultaneous connections and DB read/write ratio to a decision on how much, and which, hardware you need? Any resources on this issue would be very helpful...

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  • Django "Error: cannot import name escape" on windows

    - by Sam
    I cannot run the dev server because of this error ("Error: cannot import name escape"). I assume its because of modifications I've done to the project, but i have no idea how to find where the error is originating from to fix it. I don't import anything called escape anywhere. Update Using django-admin.py rather than the projects manage.py, don't know why... Update 2 Now manage.py is working. This may be because I had a file called email.py which was trying to import email.mime.text (ie trying to import itself) renaming to sendemail.py solved this problem.

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  • whJavaScript: how to create a JS event that requires 2 seperate JS files to be loaded first while d

    - by Teddyk
    I want to perform asynchronous JavaScript downloads of two files that have dependencies attached to them. function addScript(url) { var script = document.createElement('script'); script.src = url; document.getElementsByTagName('head')[0].appendChild(script); } addScript('http://google.com/gmaps.js'); addScript('http://jquery.com/jquery.js'); function requiresJQuery() { ... } function requiresGmaps() { ... } function requiresBothJQueryGmaps() { ... } // do some work that has no dependencies on either JQuery or Google maps ... // now call a function that requires Gmaps to be loaded if (GmapsIsLoaded) { requiresGmaps(); } // then do something that requires both JQuery & Gmaps (or wait until they are loaded) if (JQueryAndGmapsIsLoaded) { requiresBothJQueryGmaps(); } Question: How can I create an event to indicate when: JQuery is loaded? Google Maps is loaded JQuery & Google Maps are both loaded?

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  • amazon design doubt

    - by praveen
    I was looking at the amazon website and was wondering how one of the feature would have been implemented. The feature : what customers buy after viewing a particular item. If i were to develop such a feature i would probably generate a session id for each user session and store the session id-page id combination in a log file. and if a book is bought set a separate flag for the session id-page id. A separate program can then be run on the log file periodically, to identify the groups that were bought together/viewed together and that information can be stored in a persistent file. This is ofcourse a simple solution without taking into consideration the distributed nature of the servers - but would this suffice or can you help me identify a better design.

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  • Black outline around map polygons (IE)

    - by user146780
    This only happens in some IE's. Here: http://animactions.ca/Animactions/volet_entreprise.php You may notice that when you click and drag on one of the circles, you will get something similar to this: http://img534.imageshack.us/img534/7578/errorra.png I cannot figure it out. Here is my image map: <p class="style2"> <map id="FPMap0" name="FPMap0"> <area coords="405, 8, 375, 10, 353, 13, 322, 30, 317, 48, 327, 69, 344, 75, 370, 84, 401, 86, 428, 81, 454, 69, 466, 56, 468, 37, 452, 19, 419, 9" href="le_developpement_des_equipes_de_travail.php" shape="poly" style="outline:0" target="_blank" /> <area coords="95, 164, 65, 166, 43, 174, 21, 186, 16, 206, 27, 225, 48, 237, 76, 241, 99, 241, 129, 236, 151, 228, 165, 214, 167, 194, 154, 177, 130, 168, 105, 165" href="le_developpement_operationnel.php" shape="poly" style="outline:0" target="_blank" /> <area coords="138, 17, 115, 7, 95, 8, 63, 8, 41, 20, 21, 35, 23, 60, 42, 74, 77, 83, 117, 86, 144, 76, 164, 62, 173, 40, 156, 21, 137, 12" href="coaching_strategique_de_cadre.php" shape="poly" style="border-width:0" target="_blank" /> </map> <img alt="services entreprise" height="258" src="Images/service_ent.PNG" width="490" usemap="#FPMap0" /></p> I really hope someone can figure this out because I'v tried everything... Thanks

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  • Basic Tooltip (jQuery)

    - by Nimbuz
    HTML: <a href="#" rel="tooltip">Open Tooltip</a> <div id="tooltip">Tooltip Content</div> I checked out some tooltip plugins but my requirement is a really basic tooltip that shows a hidden div on hover. All plugins either have too many advanced options that I don't require and have already styled tooltips that might be difficult to modify. I'd appreciate any help. Thanks.

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  • What are best practices for securing the admin section of a website?

    - by UpTheCreek
    I'd like to know what people consider best practice for securing the Admin sections of websites, specifically from an authentication/access point of view. Of course there are obvious things, such as using SSL and logging all access, but I'm wondering just where above these basic steps people consider the bar to be set. For example: Are you just relying on the same authentication mechanism that you use for normal users? If not, what? Are you running the Admin section in the same 'application domain'? What steps do you take to make the admin section undiscovered? (or do you reject the while 'obscurity' thing)

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  • CSS background image ?

    - by BillyD
    I have a div that is 200px by 200px. If I want to place a 30x30px no-repeat background image at the top left corner position of 120px from the left and 50px from the top ... while also allowing the text inside that div to be displayed on top of the background image ... how would I do that? I tried the following, but it doesnt appear to work. background:url(http://example.com/background-image.png) no-repeat 120px 50px; Any ideas how to perform what I want to accomplish?

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  • Website. AJAX and FIREFOX problems. I dont think Firefox likes ajax..?

    - by DJDonaL3000
    Working on an AJAX website (HTML,CSS,JavaScript, AJAX, PHP, MySQL). I have multiple javascript functions which take rows from mysql, wrap them in html tags, and embed them in the HTML (the usual usage of AJAX). THE PROBLEM: Everything is working perfect, except when I run the site with Firefox (for once its not InternetExplorer causing the trouble). The site is currently in the developmental stage, so its offline, but running on the localhost (WampServer, apache, Windows XP SP3,VISTA,7). All other cross-browser conflicts have been removed, and works perfectly on all major browsers including IE, Chrome, Opera and Safari, but I get absolutely nothing from the HTTPRequest (AJAX) if the browser is Firefox. All browsers have the latest versions. THE CODE: I have a series of javascript functions, all of which are structured as follows: function getDatay(){ var a = document.getElementById( 'item' ).innerHTML; var ajaxRequest; try{//Browser Support Code: // code for IE7+, Firefox, Chrome, Opera, Safari: ajaxRequest = new XMLHttpRequest(); } catch (e){ // code for IE6, IE5: try{ ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try{ ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e){ // Something went wrong alert("Your browser is not compatible - Browser Incompatibility Issue."); return false; } } } // Create a function that will receive data sent from the server ajaxRequest.onreadystatechange = function(){ if(ajaxRequest.readyState < 4){ document.getElementById( 'theDiv' ).innerHTML = 'LOADING...'; } if(ajaxRequest.readyState == 4){ document.getElementById( 'theDiv' ).innerHTML = ajaxRequest.responseText; } } //Post vars to PHP Script and wait for response: var url="01_retrieve_data_7.php"; url=url+"?a="+a; ajaxRequest.open("POST", url, false);//must be false here to wait for ajaxRequest to complete. ajaxRequest.send(null); } My money is on the final five lines of code being the cause of the problem. Any suggestions how to get Firefox and AJAX working together are most welcome...

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  • JavaScript: How can I delay running some JS code until my JS file downloaded?

    - by Henryh
    I have the following code: <script type="text/javascript"> function addScript(url) { var script = document.createElement('script'); script.src = url; document.getElementsByTagName('head')[0].appendChild(script); } addScript('http://example.com/One.js'); addScript('http://example.com/Two.js'); addScript('http://example.com/Three.js'); addScript('http://example.com/Four.js'); ... // run code below this point once Two.js has been downloaded and excuted </script> How can I detect when one of my JavaScript files has been downloaded and executed so that I can use it?

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  • Book recommendation for developing ecommerce website in Java

    - by Mirage
    I have seen that there are many books titled: Build Ecommerce website in php Build shopping carts in php or asp.net Is there any book which explains, from scratch, how to start building a website in Java using any framework or with servlets or JSP? Desired topics: Basic forms with logins and registration Building catalogue system Building shopping cart Building newsletters system

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  • What is the best way to create a wizard for web?

    - by Yan
    I want to create a wizard that includes a few steps, that in the final steps we need to include all the steps and save to the data base. What is the best design to do this ? Is there an implementation for jquery ? Do I need to save the steps in session till the final save ?

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  • Using Action Filters for user login in Asp.NET MVC?

    - by ripper234
    I recently built a site using Asp.Net. The way I chose to implement user login is through a base 'UserAwareController' class, that all controllers extend. It contained a reference to the UserRepository, and exposed a protected GetCurrentUser() method that concrete controllers could query. The whole process felt a bit wishy-washy to me. Is Action Filters a good alternative? What are its benefits? Is there something else I might be missing?

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  • unexplained spacing in horizontal panel in GWT

    - by special0ne
    hi, i am adding widgets to a horizontal panel, and i want them to be all once next to the other on the left corner. even though i have set the spacing=0 and alignment= left the widgets still have space between them. they are spread evenly in the panel. please see the code here for the widget C'tor and the function that adds a new tab (toggle button) tabsPanel is a horizontalPanel, that you can see is aligned to left/right according to the locale any advise would be appreciated thanks.... public TabsWidgetManager(int width, int height, int tabs_shift_direction){ DecoratorPanel decorContent = new DecoratorPanel(); DecoratorPanel decorTitle = new DecoratorPanel(); widgetPanel.setSize(Integer.toString(width), Integer.toString(height)); tabsPanel.setSize(Integer.toString(UIConst.USER_CONTENT_WIDTH), Integer.toString(UIConst.TW_DEFAULT_TAB_HEIGHT)); tabsPanel.setSpacing(0); if (tabs_shift_direction==1) tabsPanel.setHorizontalAlignment(HorizontalPanel.ALIGN_LEFT); else tabsPanel.setHorizontalAlignment(HorizontalPanel.ALIGN_RIGHT); decorTitle.add(tabsPanel); contentPanel.setSize(Integer.toString(UIConst.USER_CONTENT_WIDTH), Integer.toString(UIConst.USER_CONTENT_MINUS_TABS_HEIGHT)); decorContent.add(contentPanel); widgetPanel.add(decorTitle, 0, 0); widgetPanel.add(decorContent, 0, UIConst.TW_DEFAULT_TAB_HEIGHT+15); initWidget(widgetPanel); } public void addTab(String title, Widget widget){ widget.setVisible(false); ToggleButton tab = new ToggleButton(title); tabsList.add(tab); tab.setSize(Integer.toString(UIConst.TW_TAB_DEFAULT_WIDTH), Integer.toString(UIConst.TW_TAB_DEFAULT_HEIGHT)); tab.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { handleTabClick((ToggleButton)event.getSource()); } }); //adding to the map tabToWidget.put(tab, widget); // adding to the tabs bar tabsPanel.add(tab); //adding to the content contentPanel.add(widget); }

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  • Google Chrome and (cache or memory leaks).

    - by Alexey Ogarkov
    Hello All, I have a big problem with Google Chrome and its memory. My app is displaying to user several image charts and reloads them every 10s. In the interval i have code like that var image = new Image(); var src = 'myurl/image'+new Date().getTime(); image.onload = function() { document.getElementById('myimage').src = src; image.onload = image.onabort = image.onerror = null; } image.src = src; So i have no memory leaks in Firefox and IE. Here the response headers for images Server Apache-Coyote/1.1 Vary * Cache-Control no-store (// I try no-cache, must-revalidate and so on here) Content-Type image/png Content-Length 11131 Date Mon, 31 May 2010 14:00:28 GMT Vary * taken from here In about:cache page there is no my cached images. If i enable purge-memory-button for chrome (--purge-memory-button parameter) it`s not help. Images is in PNG24. So i think that the problem is not in cache. May be Google Chrome is not releasing memory for old images. Please help. Any suggestions. Thanks.

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  • What does Silverlight offer?

    - by Maurizio Reginelli
    I'm working with C# and WPF and I would like to study something related to web programming. I already know HTML and CSS, and since I'm working with WPF, I am wondering if going into Silverlight is a good choice to start web developing. Can it be a substitute of server-side programming languages, like PHP or ASP .NET? What do you suggest? Thank you very much

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  • Practical ways around the GPL?

    - by Daniel
    My company makes an extremely specialized piece of software which costs a lot of money for those few who need it. On our current release we have no choice but to use a few libraries which are released only under the GPL. Releasing the code is not an option and it would take months, if not years to implement the functionality the libraries provide. What do companies do in this situation? Are there practical and legal ways around the GPL?

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