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  • Precise explanation of JavaScript <-> DOM circular reference issue

    - by Joey Adams
    One of the touted advantages of jQuery.data versus raw expando properties (arbitrary attributes you can assign to DOM nodes) is that jQuery.data is "safe from circular references and therefore free from memory leaks". An article from Google titled "Optimizing JavaScript code" goes into more detail: The most common memory leaks for web applications involve circular references between the JavaScript script engine and the browsers' C++ objects' implementing the DOM (e.g. between the JavaScript script engine and Internet Explorer's COM infrastructure, or between the JavaScript engine and Firefox XPCOM infrastructure). It lists two examples of circular reference patterns: DOM element → event handler → closure scope → DOM DOM element → via expando → intermediary object → DOM element However, if a reference cycle between a DOM node and a JavaScript object produces a memory leak, doesn't this mean that any non-trivial event handler (e.g. onclick) will produce such a leak? I don't see how it's even possible for an event handler to avoid a reference cycle, because the way I see it: The DOM element references the event handler. The event handler references the DOM (either directly or indirectly). In any case, it's almost impossible to avoid referencing window in any interesting event handler, short of writing a setInterval loop that reads actions from a global queue. Can someone provide a precise explanation of the JavaScript ↔ DOM circular reference problem? Things I'd like clarified: What browsers are effected? A comment in the jQuery source specifically mentions IE6-7, but the Google article suggests Firefox is also affected. Are expando properties and event handlers somehow different concerning memory leaks? Or are both of these code snippets susceptible to the same kind of memory leak? // Create an expando that references to its own element. var elem = document.getElementById('foo'); elem.myself = elem; // Create an event handler that references its own element. var elem = document.getElementById('foo'); elem.onclick = function() { elem.style.display = 'none'; }; If a page leaks memory due to a circular reference, does the leak persist until the entire browser application is closed, or is the memory freed when the window/tab is closed?

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  • Suds array of arrays not nesting

    - by joshcartme
    Let me preface this by saying that I am still pretty new to SOAP and how things should work. I'm working with the Vertical Response API. I'm having trouble getting suds to construct the xml correctly for a request. Here is some code: from suds.client import Client url = 'https://api.verticalresponse.com/wsdl/1.0/VRAPI.wsdl' client = Client(url) vr = client.service ... test_list = ( ( { 'name' : 'email_address', 'value' : login['username'], }, { 'name' : 'First_Name', 'value' : 'VR_User', } ), ( { 'name' : 'email_address', 'value' : '[email protected]', }, { 'name' : 'First_Name', 'value' : login['username'], }, ), ) # sid and cid are correctly retrieved prior to this point print "Sending test message..." vr.sendEmailCampaignTest({ 'session_id' : sid, 'campaign_id' : cid, 'recipients' : test_list, }) In this context login['username'] is just an email address. That code raises this error: suds.WebFault: Server raised fault: 'Application failed during request deserialization: Too many elements in array. 4 instead of claimed 2 (2) Here is the the definition of sendEmailCampaignTest: http://developers.verticalresponse.com/api/soap/methods/campaigns/sendemailcampaigntest/ Here is the xml that logging outputs (I removed the session_id and list_id for display here): DEBUG:suds.client:headers = {'SOAPAction': u'"VR/API/1_0#sendEmailCampaignTest"', 'Content-Type': 'text/xml; charset=utf-8'} ERROR:suds.client:<?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:ns3="http://api.verticalresponse.com/1.0/VRAPI.xsd" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns0="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns4="VR/API/1_0" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Header/> <ns0:Body> <ns4:sendEmailCampaignTest> <args xsi:type="ns3:sendEmailCampaignTestArgs"> <session_id xsi:type="ns1:string">redacted</session_id> <campaign_id xsi:type="ns1:int">redacted</campaign_id> <recipients xsi:type="ns3:ArrayOfNVDictionary" ns2:arrayType="ns3:NVDictionary[2]"> <item> <name xsi:type="ns1:string">email_address</name> <value xsi:type="ns1:string">[email protected]</value> </item> <item> <name xsi:type="ns1:string">First_Name</name> <value xsi:type="ns1:string">VR_User</value> </item> <item> <name xsi:type="ns1:string">email_address</name> <value xsi:type="ns1:string">[email protected]</value> </item> <item> <name xsi:type="ns1:string">First_Name</name> <value xsi:type="ns1:string">[email protected]</value> </item> </recipients> </args> </ns4:sendEmailCampaignTest> </ns0:Body> </SOAP-ENV:Envelope> DEBUG:suds.client:http failed: <?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Client</faultcode><faultstring>Application failed during request deserialization: Too many elements in array. 4 instead of claimed 2 (2) </faultstring></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope> a ruby script (provided by Vertical Response) that does the same things as the script I am working on in python outputs the following xml (I removed the session_id and list_id): <?xml version="1.0" encoding="utf-8" ?> <env:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <env:Body> <n1:sendEmailCampaignTest xmlns:n1="VR/API/1_0" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <args xmlns:n2="http://api.verticalresponse.com/1.0/VRAPI.xsd" xsi:type="n2:sendEmailCampaignTestArgs"> <session_id xsi:type="xsd:string">redacted</session_id> <campaign_id xsi:type="xsd:int">redacted</campaign_id> <recipients xmlns:n3="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="n3:Array" n3:arrayType="n2:NVDictionary[2]"> <item xsi:type="n3:Array" n3:arrayType="n2:NVPair[2]"> <item> <name xsi:type="xsd:string">email_address</name> <value href="#id9496430"></value> </item> <item> <name xsi:type="xsd:string">First_Name</name> <value xsi:type="xsd:string">VR_User</value> </item> </item> <item xsi:type="n3:Array" n3:arrayType="n2:NVPair[2]"> <item> <name xsi:type="xsd:string">email_address</name> <value xsi:type="xsd:string">[email protected]</value> </item> <item> <name xsi:type="xsd:string">First_Name</name> <value href="#id9496430"></value> </item> </item> </recipients> </args> </n1:sendEmailCampaignTest> <value id="id9496430" xsi:type="xsd:string" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">[email protected]</value> </env:Body> </env:Envelope> I understand that the error is in the construction of recipients. It should contain two items, each that contain two items but my python script using suds is setting it up to contain four unnested items. So my question is how can I get suds to correctly construct the xml?

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  • How to run a shell command and selectively ignore the status?

    - by Walter Nissen
    I've got a shell script that I would like to stop with an error on nonzero status most of the time, but in some cases I want to ignore it. For example: #!/bin/tcsh -vxef cp file/that/might/not/exist . #Want to ignore this status cp file/that/might/not/exist . ; echo "this doesn't work" cp file/that/must/exist . #Want to stop if this status is nonzero

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  • Javascript Global Variables Not Working as expected. Help?

    - by capri corn
    I am new to Javascript. I am facing a problem with global variables. I can't figure out that why the global variables are not working as the code looks ok. Please Help me solve this problem. I will breifly explain the code first.I have some text on a page which changes to text field when clicked. When I define the variables inside the functions body the code starts working fine. When these variables are defined globally as in the following code, the console displays this error: the variable is not defined. Here my code: <!DOCTYPE HTML> <html> <head> <title>Span to Text Box - Demo - DOM</title> <script type="text/javascript" language="javascript"> var textNode = document.getElementById('text'); var textValue = textNode.firstChild.nodeValue; var textboxNode = document.getElementById('textbox'); var doneButton = document.getElementById('done'); function change() { textboxNode.setAttribute('value', textValue); textNode.style.display = 'none'; textboxNode.setAttribute('type','text'); doneButton.setAttribute('type','button'); } function changeBack() { textNode.firstChild.nodeValue = textboxNode.value; textNode.style.display = 'block'; textboxNode.setAttribute('type', 'hidden'); doneButton.setAttribute('type','hidden'); } </script> </head> <body> <p id="text" onClick="change()">Click me!</p> <form onSubmit="return false;"> <input type="hidden" id="textbox" /> <input type="hidden" id="done" onClick="changeBack()" value="Done" /> </form> </body> </html> Please Help! Thanks in Advance.

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  • Where i am doing wrong in this?

    - by kumar
    <script type="text/javascript"> $(document).ready(function() { $('#PbtnSubmit').attr('disabled', 'disabled'); $('#PbtnCancel').attr('disabled', 'disabled'); $('#PbtnSelectAll').click(function() { $('#PricingEditExceptions input[type=checkbox]').attr('checked', 'checked'); $('#PbtnSubmit').removeAttr('disabled'); $('#PbtnCancel').removeAttr('disabled'); $('fieldset').find("input,select,textarea").removeAttr('disabled'); }); $('#PbtnCancel').click(function() { $('#PricingEditExceptions input[name=PMchk]').attr('checked', false); $('#PbtnSubmit').attr('disabled', 'disabled'); $('#PbtnCancel').attr('disabled', 'disabled'); $('fieldset').find("input:not(:checkbox),select,textarea").attr('disabled', 'disabled'); $('#genericfieldset').find("input,select,textarea").removeAttr('disabled'); }); $('#PbtnSubmit').click(function() { $('#PricingEditExceptions input[name=PMchk]').each(function() { if ($("#PricingEditExceptions input:checkbox:checked").length > 0) { var checked = $('#PricingEditExceptions input[type=checkbox]:checked'); var PMstrIDs = checked.map(function() { return $(this).val(); }).get().join(','); $('#1_exceptiontypes').attr('value', exceptiontypes) $('#1_PMstrIDs').attr('value', PMstrIDs); } else { alert("Please select atleast one exception"); return false; } }); }); function validate_excpt(formData, jqForm, options) { var form = jqForm[0]; } // post-submit callback function showResponse(responseText, statusText, xhr, $form) { if (responseText[0].substring(0, 16) != "System.Exception") { $('#error-msg-ID span:last').html('<strong>Update successful.</strong>'); } else { $('#error-msg-ID span:last').html('<strong>Update failed.</strong> ' + responseText[0].substring(0, 48)); } $('#error-msg-ID').removeClass('hide'); } $('#exc-').ajaxForm({ target: '#error-msg-ID', beforeSubmit: validate_excpt, success: showResponse, dataType: 'json' }); $('.button').button(); }); </script> This is my button.. at very first when page load I am trying Make Disabled PbtnSubmit and PbtnCancel and when we click PbtnSelectAll I am enabling back again.. but its not doing with this code. is that something I am doing worng in this? thanks

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  • ajaxSubmit options success & error functions aren't fired

    - by Thommy Tomka
    jQuery 1.7.2 jQuery Validate 1.1.0 jQuery Form 3.18 Wordpress 3.4.2 I am trying to code a contact/ mail form in above environment/ with above jQuery libs. Now I am having a problem with the jQuery Form JS: I have taken the original code from the developers page for ajaxSubmit and only altered the target option to an ID which exists in my HTML source and replaced $ with jQuery in function showRequest. The problem is, that the function namend after success: does not fire. I tried the same with error: and again nothing fired. Only complete: did and the function I placed there alerted the responseText from the receiving script. Does anyone has an idea whats going wrong? Thanks in advance! Thomas jQuery(document).ready(function() { var options = { target: '#mail-status', // target element(s) to be updated with server response beforeSubmit: showRequest, // pre-submit callback success: showResponse, // post-submit callback // other available options: //url: url // override for form's 'action' attribute //type: type // 'get' or 'post', override for form's 'method' attribute //dataType: null // 'xml', 'script', or 'json' (expected server response type) //clearForm: true // clear all form fields after successful submit //resetForm: true // reset the form after successful submit // $.ajax options can be used here too, for example: //timeout: 3000 }; jQuery("#mailform").validate( { submitHandler: function(form) { jQuery(form).ajaxSubmit(options); }, errorPlacement: function(error, element) { }, rules: { author: { minlength: 2, required: true }, email: { required: true, email: true }, comment: { minlength: 2, required: true } }, highlight: function(element) { jQuery(element).addClass("e"); jQuery(element.form).find("label[for=" + element.id + "]").addClass("e"); }, unhighlight: function(element) { jQuery(element).removeClass("e"); jQuery(element.form).find("label[for=" + element.id + "]").removeClass("e"); } }); }); // pre-submit callback function showRequest(formData, jqForm, options) { // formData is an array; here we use $.param to convert it to a string to display it // but the form plugin does this for you automatically when it submits the data var queryString = jQuery.param(formData); // jqForm is a jQuery object encapsulating the form element. To access the // DOM element for the form do this: // var formElement = jqForm[0]; alert('About to submit: \n\n' + queryString); // here we could return false to prevent the form from being submitted; // returning anything other than false will allow the form submit to continue return true; } // post-submit callback function showResponse(responseText, statusText, xhr, $form) { // for normal html responses, the first argument to the success callback // is the XMLHttpRequest object's responseText property // if the ajaxSubmit method was passed an Options Object with the dataType // property set to 'xml' then the first argument to the success callback // is the XMLHttpRequest object's responseXML property // if the ajaxSubmit method was passed an Options Object with the dataType // property set to 'json' then the first argument to the success callback // is the json data object returned by the server alert('status: ' + statusText + '\n\nresponseText: \n' + responseText + '\n\nThe output div should have already been updated with the responseText.'); }

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  • Variable assignment in bash

    - by Werner
    Hi, this is probably a very stupid question; in a bash script, given the output of, for instance; awk '{print $7}' temp it gives 0.54546 I would like to give this to a variable, so I tried: read ENE <<< $(awk '{print $7}' temp) but I get Syntax error: redirection unexpected Could you tell me why, and what is the easiest way to do this assignment? Thanks

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  • Passing a parameter to ant from CruiseControl Dashboard

    - by MSUDrew
    I am working on incorporating CruiseControl into my teams build process. What we need is a way to pass a Clearcase view name into the ant script so it knows what view to use when building. Sometimes a developer needs to create a build that is used for their testing only and not on the main integration branch. Is there a way to do this?

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  • getting part of an image with javascript

    - by Alper
    Hi all, i want to ask that, is it possible to show any part of image in img tag (with pixels) via Javascript. I mean, i'll prepare a big image (e.g. 32x320 pixels) and i'll define starting position (X,Y , e.g. 0,32) and width/height (e.g. 32,32), so script will show second (32x32 pixel) part of main image.. I hope i can explain. Thanks right now..

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  • Can you authenticate Facebook Graph entirely from command line with Python?

    - by Sebastian
    I'm writing a (tabbed) application for Facebook that requires a background process to run on a server and, periodically, upload images to an album on this application's page. What I'm trying to do is create a script that will: a) authenticate me with the program b) upload an image to a specific album All of this entirely from the command line and completely with the new Graph API. My problem right now is trying to locate the documentation that will allow me to get a token without a pop-up window of sorts. Thoughts?

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  • How do you throw an HTTP error with mod_python

    - by Zxaos
    I have a setup where I'm serving simple python pages using the mod_python publisher. At some points I'd like to have the python function raise a standard apache error - for example throwing a 500 error if a required file is missing. How can I throw an apache error from within a mod_python script?

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  • nant nantcontrib configuration to use fxcop

    - by Qutbuddin Kamaal
    hi guys, i have question related fxcop i need to run fxcop attribute which i have implemented in nant build file. i have nant and nantcontrib . i have copied content of nantcontrib\bin to nant\bin folder i have set environment variable to FxCopCmd.exe then also i'm gettin' error when i run nant script : unknown target (fxcop)

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  • Javascript not getting keyDown input

    - by William
    For some reason my code just isn't wanting to fire off any kind of OnKeyDown event. I don't know why. Can anyone tell me what I'm doing wrong? <!DOCTYPE html> <html lang="en"> <head> <title>Canvas test</title> <meta charset="utf-8" /> <link href="/bms/style.css" rel="stylesheet" /> <style> body { text-align: center; background-color: #000000;} canvas{ background-color: #ffffff;} </style> <script type="text/javascript"> var x = 50; var y = 250; var speed = 5; function controls(event){ if(!e){ //for IE e = window.event; } if(e.keyCode==37){//keyCode 37 is left arrow x -= speed; } if(e.keyCode==39){ //keyCode 39 is right arrow x += speed; } if(e.keyCode==38){//keyCode 37 is up arrow y -= speed; } if(e.keyCode==40){ //keyCode 39 is down arrow y += speed; } } function update(){ document.onkeydown="controls(event);"; draw(); } function draw(){ var canvas = document.getElementById('screen1'); if (canvas.getContext){ var ctx = canvas.getContext('2d'); ctx.fillStyle = 'rgba(255,255,255,0.5)'; ctx.fillRect(0,0,500,500); ctx.fillStyle = 'rgb(236,138,68)'; ctx.fillRect(x,y,25,25); } } setInterval('update();', 1000/60); </script> </head> <body> <canvas id="screen1" width="500" height="500"></canvas> </body> </html>

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  • what will be the code to move to previous textfield ?

    - by rajesh
    i have the code if i press down button it goes to next textfield but to go to previous textfield what should be the code ... <html> <head> <script language="JavaScript"> function handleKeyDownEvent(elementRef,eventRef) { var charCode = (window.event) ? eventRef.keyCode : eventRef.which; //alert(charCode); // Arrow keys (37:left, 38:up, 39:right, 40:down)... if (charCode == 40) { if (window.event) window.event.keyCode = 9; else event.which = 9; return true; } return true; } </script> </head> <body> <table width="433" border="1" cellspacing="0" cellpadding="0"> <tr> <td width="235" align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td> <td width="235" align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td> </tr> <tr> <td width="235" align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td> <td width="235" align="center"><input type="text" onKeyDown="handleKeyDownEvent(this,event);" onKeyUp="handleKeyUpEvent(this,event);"></td> </tr> <tr> <td> <input type="radio" id="check" name="check" checked> </td> <td> <input type="radio" id="check" name="check" checked> </td> </tr> <tr> <td><input type="checkbox" id="check" name="check"></td> <td><input type="checkbox" id="check" name="check"></td> </tr> </table> </body> </html>

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  • Need this VB code changed into Python.

    - by David
    I wrote this code in VB to label columns in a table but now im writting a python script to automate the process and i can't make it work. Any thoughts?? Static v1 as variant Static v2 as variant Dim Output as double Dim Start as double Start = 1 If v2 = [XMIN] Then Output = v1 Else Output = v1 + 1 End If v1 = Output v2 = [XMIN]

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  • Bash: How to flush output to a file while running

    - by noam
    I have a small script, which is called daily by crontab using the following command: /homedir/MyScript &> some_log.log The problem with this method is that some_log.log is only created after MyScript finishes. I would like to flush the output of the program into the file while it's running so I could do things like tail -f some_log.log and keep track of the progress, etc.

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  • jQuery appendTo (switching back and forth)

    - by Starboy
    So what I'm trying to accomplish is a simple appendTo a certain element. The issue I'm having is after execute is run, it appends to the location but then proceed to go back to the ul it resides in. <script type="text/javascript"> function execute() { $('#desCopy').appendTo('#description') $('#imgPlace').appendTo('#IMGbox') } </script> <div id="content" style="background:#000; width:989px;"> <div style="float:left; left:18px; margin:0; width:337px; position:relative; padding:15px 0 0 0; color:#FFF;"> <div id="description"> </div> </div> <div id="IMGbox" style="float:left; position:relative; display:block; background:#F00; width:652px; height:258px; background:#0FF; overflow:hidden;"> </div> <div style="float:right; background:#CCC; height:25px; width:652px;"> <ul> <li><a href="" onclick="execute()">Slide 1</a> <ul style=""> <li><span id="desCopy">Test description, Test description</span></li> <li><img src="images/test.jpg" id="imgPlace"></li> </ul> </li> </ul> </div> </div>

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  • PHP GD Allowed memory size exhausted

    - by gurun8
    I'm trying to process a directory of JPEG images (roughly 600+, ranging from 50k to 500k) using PHP: GD to resize and save the images but I've hit a bit of a snag quite early in the process. After correctly processing just 3 images (30K, 18K and 231K) I get a Allowed memory size of 16777216 bytes exhausted PHP Fatal error. I'm cycling through the images and calling the code below: list($w, $h) = getimagesize($src); if ($w > $it->width) { $newwidth = $it->width; $newheight = round(($newwidth * $h) / $w); } elseif ($w > $it->height) { $newheight = $it->height; $newwidth = round(($newheight * $w) / $h); } else { $newwidth = $w; $newheight = $h; } // create resize image $img = imagecreatetruecolor($newwidth, $newheight); $org = imagecreatefromjpeg($src); // Resize imagecopyresized($img, $org, 0, 0, 0, 0, $newwidth, $newheight, $w, $h); imagedestroy($org); imagejpeg($img, $dest); // Free up memory imagedestroy($img); I've tried to free up memory with the imagedestroy function but it doesn't seem to have any affect. The script just keeps consistently choking at the imagecreatefromjpeg line of code. I checked the php.ini and the memory_limit = 16M setting seems like it's holding correctly. But I can't figure out why the memory is filling up. Shouldn't it be releasing the memory back to the garbage collector? I don't really want to increase the memory_limit setting. This seems like a bad workaround that could potentially lead to more issues in the future. FYI: I'm running my script from a command prompt. It shouldn't affect the functionality but might influence your response so I thought I should mention it. Can anyone see if I'm just missing something simple or if there's a design flaw here? You'd think that this would be a pretty straightforward task. Surely this has to be possible, right?

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  • How can I implement a site with ASP.NET MVC without using Visual Studio?

    - by Cheeso
    I have seen ASP.NET MVC Without Visual Studio, which asks, Is it possible to produce a website based on ASP.NET MVC, without using Visual Studio? And the accepted answer is, yes. Ok, next question: how? Here's an analogy. If I want to create an ASP.NET Webforms page, I load up my favorite text editor, create a file named Something.aspx. Then I insert into that file, some boilerplate: <%@ Page Language="C#" Debug="true" Trace="false" Src="Sourcefile.cs" Inherits="My.Namespace.ContentsPage" %> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Title goes here </title> <link rel="stylesheet" type="text/css" href="css/style.css"></link> <style type="text/css"> #elementid { font-size: 9pt; color: Navy; ... more css ... } </style> <script type="text/javascript" language='javascript'> // insert javascript here. </script> </head> <body> <asp:Literal Id='Holder' runat='server'/> <br/> <div id='msgs'></div> </body> </html> Then I also create the Sourcefile.cs file: namespace My.Namespace { using System; using System.Web; using System.Xml; // etc... public class ContentsPage : System.Web.UI.Page { protected System.Web.UI.WebControls.Literal Holder; void Page_Load(Object sender, EventArgs e) { // page load logic here } } } And that is a working ASPNET page, created in a text editor. Drop it into an IIS virtual directory, and it's working. What do I have to do, to make a basic, hello, World ASPNET MVC app, in a text editor? (without Visual Studio) Suppose I want a basic MVC app with a controller, one view, and a simple model. What files would I need to create, and what would go into them?

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  • ASP.NET Application Level vs. Session Level and Global.asax...confused

    - by contactmatt
    The following text is from the book I'm reading, 'MCTS Self-Paced Training Kit (Exam 70-515) Web Applications Development with ASP.NET 4". It gives the rundown of the Application Life Cycle. A user first makes a request for a page in your site. The request is routed to the processing pipeline, which forwards it to the ASP.NET runtime. The ASP.NET runtime creates an instance of the ApplicationManager class; this class instance represents the .NET framework domain that will be used to execute requests for your application. An application domain isolates global variables from other applications and allows each application to load and unload separately, as required. After the application domain has been created, an instance of the HostingEnvironment class is created. This class provides access to items inside the hosting environment, such as directory folders. ASP.NET creates instances of the core objects that will be used to process the request. This includes HttpContext, HttpRequest, and HttpResponse objects. ASP.NET creates an instance of the HttpApplication class (or an instance is reused). This class is also the base class for a site’s Global.asax file. You can use this class to trap events that happen when your application starts or stops. When ASP.NET creates an instance of HttpApplication, it also creates the modules configured for the application, such as the SessionStateModule. Finally, ASP.NET processes request through the HttpApplication pipleline. This pipeline also includes a set of events for validating requests, mapping URLs, accessing the cache, and more. The book then demonstrated an example of using the Global.asax file: <script runat="server"> void Application_Start(object sender, EventArgs e) { Application["UsersOnline"] = 0; } void Session_Start(object sender, EventArgs e) { Application.Lock(); Application["UsersOnline"] = (int)Application["UsersOnline"] + 1; Application.UnLock(); } void Session_End(object sender, EventArgs e) { Application.Lock(); Application["UsersOnline"] = (int)Application["UsersOnline"] - 1; Application.UnLock(); } </script> When does an application start? Whats the difference between session and application level? I'm rather confused on how this is managed. I thought that Application level classes "sat on top of" an AppDomain object, and the AppDomain contained information specific to that Session for that user. Could someone please explain how IIS manages Applicaiton level classes, and how an HttpApplication class sits under an AppDomain? Anything is appreciated.

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