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  • added div does not recognize jquery function

    - by zurna
    I pull categories of one section from a XML. Problem is, pulled categories need to recognize tab plugin but they do not recognize it. I am not sure if I made sense, please let me know if I didnt make any sense. I will try to explain it again. :) $.ajax({ dataType: "xml", url: "/FLPM/content/home/index.cs.asp?Process=ViewVCategories", success: function(xml) { $(xml).find('row').each(function(){ var id = $(this).attr('id'); var CategoryName = $(this).find('CategoryName').text(); $("<div class='tab fleft'><a href='#'>"+ CategoryName + "</a></div>").appendTo("#VCategories"); }); } }); $("div.row-title").tabs("div.panes > div", {effect: 'ajax'}, function(i) { // get the pane to be opened var pane = this.getPanes().eq(i); // load it with a page specified in the tab's href attribute pane.html('<img src="http://www.refinethetaste.com/html/cp/images/loading.gif" alt="Loading..." />') .load(this.getTabs().eq(i).attr("href")); }); pulled categories displayed here: <div class="row-title clear" id="VCategories"> categories xml <rows> - <row id="1"> <CategoryName>Nation</CategoryName> </row> - <row id="2"> <CategoryName>Politics</CategoryName> </row> - <row id="3"> <CategoryName>Health</CategoryName> </row> - <row id="4"> <CategoryName>Business</CategoryName> </row> - <row id="5"> <CategoryName>Culture</CategoryName> </row> </rows> </div>

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  • how to use javascript to add link to image element created using javascript

    - by parag
    how to add link for the image created using following javascript. thanks for any help or replies. for(var i=0; i<images.length; i++) { var t = document.createElement('IMG'); t.setAttribute('src',images[i]); t.setAttribute('border', 0); t.setAttribute('width',imageWidth); t.setAttribute('height',imageHeight); t.style.position = 'absolute'; t.style.visibility = 'hidden'; el.appendChild(t); }

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  • can't load/read yahoo geocode as xml and read it in jquery

    - by mastah
    Hi, I tried saving the result as an xml, when I read from there it works, but if I read it from yahoo's api, doesn't load anything. You can check it here here's my script $(document).ready(function(){ $.ajax({ type: "GET", url: "http://local.yahooapis.com/MapsService/V1/geocode?appid=YD-9G7bey8_JXxQP6rxl.fBFGgCdNjoDMACQA--&zip=10035", dataType: "xml", success: function(xml) { $(xml).find('Result').each(function(){ var city = $(this).find('City').text(); var state = $(this).find('State').text(); $('<div />').html('<p>'+city+'</p><p>'+state+'</p>').insertAfter('h2'); }); } }); });

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  • WPF- Why can't my custom textbox be selected?

    - by highone
    I have this custom textbox that I am working on and I can use it in xaml, but when I run my app I cannot select it or type in it. Here is my code: public class ModdedTextBox : TextBox { private bool selectionStartChangeFromUI; private bool selectionLengthChangeFromUI; private bool selectedTextChangeFromUI; static ModdedTextBox() { DefaultStyleKeyProperty.OverrideMetadata(typeof(ModdedTextBox), new FrameworkPropertyMetadata(typeof(ModdedTextBox))); //this.SelectionChanged += this.OnSelectionChanged; //PropertyDescriptor VerticalOffsetProperty = TypeDescriptor.GetProperties(typeof(ModdedTextBox))["VerticalOffset"]; //VerticalOffsetProperty.AddValueChanged(this, this.OnVerticalOffsetChanged); } public static readonly DependencyProperty BindableSelectionStartProperty = DependencyProperty.Register( "BindableSelectionStart", typeof(int), typeof(ModdedTextBox), new PropertyMetadata(OnBindableSelectionStartChanged)); public static readonly DependencyProperty BindableSelectionLengthProperty = DependencyProperty.Register( "BindableSelectionLength", typeof(int), typeof(ModdedTextBox), new PropertyMetadata(OnBindableSelectionLengthChanged)); public static readonly DependencyProperty BindableSelectedTextProperty = DependencyProperty.Register( "BindableSelectedText", typeof(string), typeof(ModdedTextBox), new PropertyMetadata(OnBindableSelectedTextChanged)); public static readonly DependencyProperty DelayedTextProperty = DependencyProperty.Register( "DelayedText", typeof(string), typeof(ModdedTextBox), new PropertyMetadata(OnDelayedTextChanged)); public int BindableSelectionStart { get { return (int)this.GetValue(BindableSelectionStartProperty); } set { this.SetValue(BindableSelectionStartProperty, value); } } public int BindableSelectionLength { get { return (int)this.GetValue(BindableSelectionLengthProperty); } set { this.SetValue(BindableSelectionLengthProperty, value); } } public string BindableSelectedText { get { return (string)this.GetValue(BindableSelectedTextProperty); } private set { this.SetValue(BindableSelectedTextProperty, value); } } public string DelayedText { get { return (string)this.GetValue(DelayedTextProperty); } private set { this.SetValue(DelayedTextProperty, value); } } private static void OnBindableSelectionStartChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args) { var textBox = dependencyObject as ModdedTextBox; if (!textBox.selectionStartChangeFromUI) { int newValue = (int)args.NewValue; textBox.SelectionStart = newValue; } else { textBox.selectionStartChangeFromUI = false; } } private static void OnBindableSelectionLengthChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args) { var textBox = dependencyObject as ModdedTextBox; if (!textBox.selectionLengthChangeFromUI) { int newValue = (int)args.NewValue; textBox.SelectionLength = newValue; } else { textBox.selectionLengthChangeFromUI = false; } } private static void OnBindableSelectedTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args) { var textBox = dependencyObject as ModdedTextBox; if (!textBox.selectedTextChangeFromUI) { string newValue = (string)args.NewValue; textBox.BindableSelectedText = newValue; } else { textBox.selectedTextChangeFromUI = false; } } private static void OnDelayedTextChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args) { } private void OnSelectionChanged(object sender, RoutedEventArgs e) { if (this.BindableSelectionStart != this.SelectionStart) { this.selectionStartChangeFromUI = true; this.BindableSelectionStart = this.SelectionStart; } if (this.BindableSelectionLength != this.SelectionLength) { this.selectionLengthChangeFromUI = true; this.BindableSelectionLength = this.SelectionLength; } if (this.BindableSelectedText != this.SelectedText) { this.selectedTextChangeFromUI = true; this.BindableSelectedText = this.SelectedText; } } private void OnVerticalOffsetChanged(object sender, EventArgs e) { MessageBox.Show("hello the vertical offset works"); } }

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  • jquery noConflict not working in IE8 only

    - by slik
    I have a website using the prootype framework and I am looking to use a jquery plugin. Everything works just not in IE8. It works in ie7 which amazes me. Any idea what maybe wrong? jQuery.noConflict(); function OpenUp(sURL){ window.open(sURL,null,'height=560,width=820,status=yes,toolbar=yes,menubar=yes,location=yes,resizable=yes,scrollbars=yes',false); } jQuery(document).ready(function($) { $("head").append("<link>"); css = $("head").children(":last"); css.attr({ rel: "stylesheet", type: "text/css", href: "/my/docs/jquery.simplyscroll.css" }); $("#scroller").simplyScroll({ autoMode: 'loop', framerate: 1, speed: 1 }); }); I also tired the following: var $j = jQuery.noConflict(); var j = jQuery.noConflict(); everythig works just not in IE8 alone.

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  • OSX launchd plist for node forever process

    - by lostintranslation
    I am trying to write a launchd.plist file for my node server. I am using forever to run my node server. I would like the server to start on boot. I would also like to wait for the mongodb launchd plist to run first. I installed mongobb using homebrew and it came with a launchd.plist already. I have executed the following: $ launchctl load ~/Library/LaunchAgents/homebrew.mxcl.mongodb.plist plist for mongodb is: <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>homebrew.mxcl.mongodb</string> <key>ProgramArguments</key> <array> <string>/usr/local/opt/mongodb/mongod</string> <string>run</string> <string>--config</string> <string>/usr/local/etc/mongod.conf</string> </array> <key>RunAtLoad</key> <true/> <key>KeepAlive</key> <false/> <key>WorkingDirectory</key> <string>/usr/local</string> <key>StandardErrorPath</key> <string>/usr/local/var/log/mongodb/output.log</string> <key>StandardOutPath</key> <string>/usr/local/var/log/mongodb/output.log</string> <key>HardResourceLimits</key> <dict> <key>NumberOfFiles</key> <integer>1024</integer> </dict> <key>SoftResourceLimits</key> <dict> <key>NumberOfFiles</key> <integer>1024</integer> </dict> </dict> </plist> If I shutdown the computer and restart mongodb fires up as it should. However my node server is not starting. Any ideas? <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>KeepAlive</key> <dict> <key>SuccessfulExit</key> <false/> </dict> <key>Label</key> <string>com.test.app</string> <key>ProgramArguments</key> <array> <string>/usr/local/bin/forever</string> <string>-a</string> <string>-l</string> <string>/var/log/app/app.log</string> <string>-e</string> <string>/var/log/app/app_error.log</string> <string>/data/server/app.js</string> </array> <key>RunAtLoad</key> <true/> <key>StartInterval</key> <integer>3600</integer> </dict> </plist> EDIT: writing to log file and I see this: env: node: No such file or directory I think this means that the node binary cannot be found. I can echo $PATH and /usr/local/bin is in my path. I can start node from the terminal. Ideas?

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  • Using a filename with spaces with scp and chmod in bash.

    - by speciousfool
    Periodically, I like to put files in the /tmp directory of my webserver to share out. What is annoying is that I must set the permissions whenever I scp the files. Following the advice from another question I've written a script which copies the file over, sets the permissions and then prints the URL: #!/bin/bash scp "$1" SERVER:"/var/www/tmp/$1" ssh SERVER chmod 644 "/var/www/tmp/$1" echo "URL is: http://SERVER/tmp/$1" When I replace SERVER with my actual host, everything works as expected...until I execute the script with an argument including spaces. Although I suspect the solution might be to use $@ I've not yet figured out how to get a spaced filename to work.

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  • SqlCommand asp.net C#

    - by emilios
    i you please help me out with my problem i am trying to create a function that output the data on a dropdownlist an setting my parameters my code goes as follow : public static List<string> GetTracks(out List<string> trackIds, string conferenceId) { var res = new List<string>(); trackIds = new List<string>(); var sqlCon = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString); SqlCommand cmd = new SqlCommand("select Track_name,Track_ID from TrackCommittee where Conference_id= @conferenceId", sqlCon); DataSet ds = new DataSet(); cmd.Connection.Open(); cmd.Parameters.Add(new SqlParameter("@conferenceId", conferenceId)); using (SqlDataReader sdr = cmd.ExecuteReader()) { while (sdr.Read()) { res.Add(sdr.GetString(sdr.GetOrdinal("Track_name"))); trackIds.Add(sdr.GetInt32(sdr.GetOrdinal("Track_ID")).ToString()); } } cmd.Connection.Close(); cmd.Dispose(); return res; } thanking you in advance

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  • How to get global variable in JQuery functions

    - by Tahir Akram
    I want to access my global javascript variable in JQuery methods. But I am unable to get it when I go to attach a click even to a div. As following. How can I do that? I mean do I need to rely on hidden fields for some state management? var divCount = 3; $(function() { //divCount is accessible here $("#sortable").sortable({ revert: true }); $("#new").click(function(){ if (divCount<7){ //divCount is not accessible here. why? and how? var thisCount = ++divCount; $("#draggable_"+thisCount).addClass("draggable"); } }); });

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  • Jquery, "$.each(", function returns error in IE. 'Length' is null or not an object

    - by Collin Estes
    My code is working fine in FireFox but my users are restricted to IE. I'm getting an error though in IE, related to my JQUERY function. populateTable:function(returnList) { var self = this; var eat = $.evalJSON(returnList.firstChild.textContent) $.each(eat,function() { $("<tr><td>" + this.reportId + "</td><td>" + this.description + "</td><td>" + this.drawingNumber + "<td></tr>").insertAfter(self.tblResults[0].childNodes[1]); }) } IE is erring on the $.each with the message below: 'Length' is null or not an object Any ideas or maybe a workaround for the $.each function? Update: returnList is an XML document object from an Ajax call. I'm trying to retrieve the JSON object string located within the XML tag.

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  • How to pass 2 variables to a php document with jquery

    - by Nikos
    Hello I have two text inputs which get their values from a datepicker. What I want to do is when user selects the two dates script pass these two values to a php document in which I make some checks and I return some html. Here is what I'm trying to do: (#to and $from are 2 input texts) $(document).ready(dateinput_change); function dateinput_change(){ $('#to').change(check_availability); $('#from').change(check_availability); } function check_availability(){ var to=$('#to').attr('value'); var from=$('#from').attr('value'); $.get("get_availability.php?to="+ to +"&from="+ from, show_availability); } function show_availability(available){ $('#availability').html(available); }

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  • ANDing javascript objects together

    - by Jonas
    I ran across this chunk of code (modified) in our application, and am confused to how it works: function someObject() { this.someProperty = {}; this.foo = { bar: { baz: function() { return "Huh?" } } }; this.getValue = function() { return (this.someProperty && this.foo.bar && this.foo.bar.baz && this.foo.bar.baz()) || null; } } function test() { var o = new someObject(); var val = o.getValue(); alert(val); } when you call the test() function, the text "Huh?" is alerted. I'm not sure how the result of getValue is returning that, I would've thought doing A && B && C && D would have returned true, rather than the value of D.

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  • ajax error callback is called before firing the action in Symfony 2

    - by Beginner
    I'm trying to write an application with Symfony and I'm new to it. I have an ajax call in this application. The problem is that it always fires error call back . I put breakpoint in netbeans IDE and can see that error callback is fired before firing the specified action in the url property of ajax. action code: public function userNameExistsAction() { return 'success'; } javascript: $('#register_submit').click(function(){ var path = '/symfony/web/app_dev.php/account/userNameExists'; //var userName = $('#register_userName').val(); $.ajax({ url: path, type: 'GET', success: function(){ alert('success');}, error: function() { console.log('error'); } }); }); Any help is appreciated in advance.

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  • Long Running Stored Proc - Report Progress Using BackgroundWorker & Timer

    - by daveywc
    While a long running stored proc (RMR_Seek) is executing (called via a Linq-To-SQL data context) I am trying to call another stored proc (RMR_GetLatestModelMessage) to check a table for the latest status message. The long running stored proc updates the table in question with status messages as it executes. I want to display the status message on a message panel to advise the user of the status of the execution of Proc_A. For various reasons it is not possible to determine how long RMR_Seek will take to execute so a progress bar with percentage increments is not feasible. I thought I'd found the way to do it by calling the long running stored proc from in a BackgroundWorker process DoWork event handler. This worked fine and allowed me to update my message panel with some dummy status messages that were NOT obtained via Proc_B while Proc_A was running. However now that I have tried to implement this fully by calling Proc_B to obtain the status messages I am running into problems that seem to be related to the mix of the backgroundworker and my System.Windows.Forms.Timer. An extract of the code I am using is below. I have tried many different ways around this but each one seems to present its own set of problems. The code below is problematic in the bw_DoWork event. The RMR_Seek stored proc gets called but does not execute properly - it also seems to be inconsistent as to whether _IsCompleted gets set to true. I'm sure there is a better way to achieve what I am trying to do. private bool _IsCompleted; private void RunRevenueSeek() { if (_SelectedModel == null) { MessageBox.Show("Please select a model from the list and try again.", "Model Generation", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { var bw = new BackgroundWorker(); bw.DoWork += new DoWorkEventHandler(bw_DoWork); ProgressPanelControl.Visible = true; _IsCompleted = false; MessageTimer.Start(); // Has an interval of 3000 bw.RunWorkerAsync(); ProgressLabelControl.Text = "Refreshing Data"; this.Update(); ...more code goes here } } private void bw_DoWork(object sender, DoWorkEventArgs e) { using (var dc = new RevMdlrDataClassesDataContext()) { dc.CommandTimeout = 300; dc.RMR_Seek(_SelectedModel.ModelSet_ID); _IsCompleted = true; } } private void MessageTimer_Tick(object sender, EventArgs e) { string message = ""; if (_IsCompleted) { MessageTimer.Stop(); } else { using (var dc = new RevMdlrDataClassesDataContext()) { dc.CommandTimeout = 300; dc.RMR_GetLatestModelMessage(_SelectedModel.ModelSet_ID, ref message); ProgressLabelControl.Text = message; this.Update(); } } }

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  • C#/Oracle: Specify Encoding/Character Set of Query?

    - by Reini
    I'm trying to fetch some Data of a Oracle 10 Database. Some cells are containing german umlauts (äöü). In my Administration-Tool (TOAD) I can see them very well: "Mantel für Damen" (Jacket for Women) This is my C# Code (simplified): var oracleCommand = new OracleCommand(sqlGetArticles, databaseConnection); var articleResult = oracleCommand.ExecuteReader(); string temp = articleResult.Read()["SomeField"].ToString(); Console.WriteLine(temp); The output is: "Mantel f?r Damen" Tryed on Debugging (moving mouse over variable), Debug-Window, Console-Window, File. I think I have to specify the Encoding/Character Set somwhere. But where?

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  • how can I deploy my silverlight 4 application

    - by Mark
    I have a basic Silverlight 4 project called "MySLApp" which has the associated MySLApp.Web project. (names changed for simplicity) It compiles down into these files (in the silverlight project): AppManifest.xaml MySLApp.dll MySLApp.xap MySLAppTestPage.html And the Web project builds into: Bin\MySLApp.Web.dll ClientBin\MySLApp.xap What I also have in my Web project is a .ASHX file that serves up a generated image, which my Silverlight application calls out to as the URL of an image: var uri = new Uri(@"http://localhost:1122/ImageServer.ashx", UriKind.Absolute); var bi = new BitmapImage(uri); TagImage.Source = bi; My big question boils down to this: How do I deploy my app to my IIS server? What files from where do I need to get it to work? Including the .ASHX url? Cheers, Mark

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  • How to store javascript variables in iPhone application

    - by sugar
    <script type="text/javascript"> function getSelectionRange() { var sel; if (window.getSelection) { sel = window.getSelection(); if (sel.rangeCount) { return sel.getRangeAt(0); } } else if (document.selection) { return document.selection.createRange(); } return null; } var range; </script> whatShouldBeHere=[wvText stringByEvaluatingJavaScriptFromString:@"getSelectionRange();"]; Here, method getSelectionRange is returning JavaScript Object of Range type. How can I catch & store in plist file in iPhone application ? Thanks in advance for sharing your knowledge. Sagar

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  • Prototype.js: How can i return an array without all the methods Prototypes extends Array with?

    - by Morten
    Hi! Is there a way to return a new version of an array/hash that does not contain all the methods/functions that prototype extends the array object with? Example: var myArray = $A(); myArray['test'] = '1'; myArray['test2'] = '2'; var myVariableToPassToAjax = myArray; If I debug myVariableToPassToAjax it looks like this: Array ( [test] = 1 [test2] = 2 [each] = function each(iterator, context) { .......... .......... } ...and all the other extended array functions ); Is there a way to solve this? :-/ Morten

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  • svnlook always returns an error and no output

    - by Pierre-Alain Vigeant
    I'm running this small C# test program launched from a pre-commit batch file private static int Test(string[] args) { var processStartInfo = new ProcessStartInfo { FileName = "svnlook.exe", UseShellExecute = false, ErrorDialog = false, CreateNoWindow = true, RedirectStandardOutput = true, RedirectStandardError = true, Arguments = "help" }; using (var svnlook = Process.Start(processStartInfo)) { string output = svnlook.StandardOutput.ReadToEnd(); svnlook.WaitForExit(); Console.Error.WriteLine("svnlook exited with error 0x{0}.", svnlook.ExitCode.ToString("X")); Console.Error.WriteLine("Current output is: {0}", string.IsNullOrEmpty(output) ? "empty" : output); return 1; } } I am deliberately calling svnlook help and forcing an error so I can see what is going on when committing. When this program run, SVN displays svnlook exited with error 0xC0000135. Current output is: empty I looked up the error 0xC0000135 and it mean App failed to initialize properly although it wasn't specific to svnhook. Why is svnlook help not returning anything? Does it fail when executed through another process?

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  • Jquery hover to only have effect for certain amount of time

    - by Andrew Cassidy
    Hi, I'm using a jquery hover effect but would only like the effect to last for around a second when rolled over....ie user rolls over image, it changes for a second, then reverts back to the original image. $(document).ready(function(){ $(function() { $('.rollover').hover(function() { var currentImg = $(this).attr('src'); $(this).attr('src', $(this).attr('hover')); $(this).attr('hover', currentImg); }, function() { var currentImg = $(this).attr('src'); $(this).attr('src', $(this).attr('hover')); $(this).attr('hover', currentImg); }); }); }); This is the code I'm using for the standard hover. Any help would be great, thanks.

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  • Angularjs togglecheck error(not working as intended) with prechecked data

    - by crozzfire
    I have this plunker where i have a button that opens a bootstrap modal dialog box. I the modal, when a course is selected(checked) from this list, it adds 3 to the $scope.planned and also increases the progress bar accordingly. Similarly it also reduces in the same way when a checkbox is unchecked. This is the function that does the above: $scope.toggleCheck = function (course) { //debugger var x = $scope.checkcoursefunction($scope.selectedCourses, course); if(x==true){ $scope.selectedCourses.splice($scope.selectedCourses.indexOf(course), 1); $scope.planned -= 3; } else{ if ($scope.selectedCourses.indexOf(course) === -1){ $scope.selectedCourses.push(course); $scope.planned += 3; } else { $scope.selectedCourses.splice($scope.selectedCourses.indexOf(course), 1); $scope.planned -= 3; } } $scope.getPercentage(); }; I have 2 services from where the controller fetches its data named Requirements and Planned Services. The table in the modal has a list of the requirements service data. I also have a function named checkplanneddetails() that checks if an item from this data is present in the requirements data. If present, they come in the table pre-checked. This is the function that checks: $scope.checkplanneddetails = function(course){ $scope.coursedetail = course; $scope.requirementcoursename = ($scope.coursedetail.course.subject).concat("-",$scope.coursedetail.course.course_no); for(var k = 0; k < $scope.planneddetails.length; k++){ if($scope.requirementcoursename==$scope.planneddetails[k].course_name){ $scope.selectedCourses.push(course); return true; } } return false; }; $scope.checkcoursefunction = function(arr,obj){ return (arr.indexOf(obj) != -1); } This works fine with bringing the data as checked. But the togglecheck() function does not work as they are supposed to with these checked details(they work in reverse). It always returns true(for var x in togglecheck) even after the splice function. Am i splicing the course correctly?

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  • Issue with JSON and jQuery

    - by Jason N. Gaylord
    I'm calling a web service and returning the following data in JSON format: ["OrderNumber":"12345","CustomerId":"555"] In my web service success method, I'm trying to parse both: $.ajax({ type: "POST", url: "MyService.asmx/ServiceName", data: "{}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(msg) { var data = msg.d; var rtn = ""; $.each(data, function(list) { rtn = rtn + this.OrderNumber + ", " + this.CustomerId + "<br/>"; } rtn = rtn + "<br/>" + data; $("#test").html(rtn); } }); but I'm getting a bunch of "undefined, undefined" rows followed by the correct JSON string. Any idea why? I've tried using the eval() method but that didn't help as I got some error message talking about ']' being expected.

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  • jQuery Validation Engine with Mime

    - by Diego Pucci
    I have this custom rule with tje jQuery validation Engine: "validateMIME": { "func": function(field, rules, i, options){ var fileInput = field[0].files[0]; var MimeFilter = new RegExp(rules[3],'i'); if (fileInput) { return MimeFilter.test(fileInput.type); } else { return true;} }, "alertText": "* Estensione non supportata" }, The problem is that this is working ONLY if the field is required. But in my case the field is not required, but if filled then the Mime type needs to be checked. How do I edit this function to work with non required fields? what's wrong with it? Thanks

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  • Prototype Library use of !! operator

    - by Rajat
    Here is a snippet from Prototype Javascript Library : Browser: (function(){ var ua = navigator.userAgent; var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]'; return { IE: !!window.attachEvent && !isOpera, Opera: isOpera, WebKit: ua.indexOf('AppleWebKit/') > -1, Gecko: ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1, MobileSafari: /Apple.*Mobile/.test(ua) } })(), This is all good and i understand the objective of creating a browser object. One thing that caught my eye and I haven't been able to figure out is the use of double not operator !! in the IE property. If you read through the code you will find it at many other places. I dont understand whats the difference between !!window.attachEvent and using just window.attachEvent. Is it just a convention or is there more to it that's not obvious?

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