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  • How to run/test JavaScript? [closed]

    - by user702
    I'm reading David Flanagan's "JavaScript: The Definitive Guide, 6th ed". It only actually tells users how to run JS code on page 311, where users are told of the following solutions: "Client-side JavaScript code is embedded within HTML documents in four ways: Inline, between a pair of <script> and </script> tags From an external file specified by the src attribute in a <script> tag In an HTML event handler attribute, such as onclick or onmouseover In a URL that uses the special javascript: protocol." I was wondering what professional JS developers use to write and test their code: Do they use a good text editor with syntax high-lighting + autocompletion, hit F5 in the browser to reload the page every time they make a change, and use some add-on in the browser to investigate errors? Or are there full-fledged IDE's similar to MS VisualStudio for non-web languages?

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  • How do I know that I'm good at JavaScript

    - by lKashef
    I'm an ASP.NET developer and I won't get any job because of my JavaScript skills. I started reading about JavaScript in articles and tutorials but I still didn't pick a book to read. But what I'm trying to understand. For example If you want to test your ASP.NET skills you firstly start learning the basics from a book, course, etc. And to increase my knowledge and experience, I would build a website of any given idea and start to face troubles and learn as I go. but what can I do with JavaScript! .. how am I supposed to know how good I am at it !? First Things First: I'm sorry guys, I've been facing some troubles to Comment or UpVote on the website but It's finally over, so Thanks everybody for your help =)

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  • Javascript Dropdownbox

    - by edgar
    I have a dropdownbox (percent), a input box(price) and a input box (total) When you select a percent from the dropdown, it multiplies the value of the selected dropdown times the price value and input the result in the total input box. This works well with one input box, but what I am trying to do is to use asp and when you select a percent from the drop down box, it will calcualate the rest of the total fields. Here is the code that I have so far <%@LANGUAGE="VBSCRIPT" CODEPAGE="1252"% <% Dim Recordset1 Dim Recordset1_numRows Set Recordset1 = Server.CreateObject("ADODB.Recordset") Recordset1.ActiveConnection = MM_pricdsn_STRING Recordset1.Source = "SELECT * FROM AMFLIB.MBCWCPP where cwfvnb = 1090101 and cwaitx between '0025' and '0025AT'" Recordset1.CursorType = 0 Recordset1.CursorLocation = 2 Recordset1.LockType = 1 Recordset1.Open() Recordset1_numRows = 0 %> <% Dim Repeat1__numRows Dim Repeat1__index Repeat1__numRows = -1 Repeat1__index = 0 Recordset1_numRows = Recordset1_numRows + Repeat1__numRows %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> Javascript Untitled Document <script type="text/javascript"> function startCalc4(){ interval = setInterval("calc4()",1); } function calc4(){ one = document.form1.prcbook.value; two = document.form1.percent.value; document.form1.total.value = (one * 1) * (two * 1); } function stopCalc4(){ clearInterval(interval); } </script> <style type="text/css"> <!-- #Layer1 { position:absolute; left:26px; top:49px; width:150px; height:24px; z-index:1; } #Layer2 { position:absolute; left:36px; top:22px; width:166px; height:22px; z-index:2; } #Layer3 { position:absolute; left:19px; top:24px; width:174px; height:21px; z-index:3; } --> </style> <script type="text/javascript"> function showhideText(box,id) { var elm = document.getElementById(id) elm.style.display = box.checked? "inline":"none" } </script> </head> <body> <form id="form1" name="form1" method="post" action=""> <p> </p> <p>&nbsp;</p> <p> <input type="text" name="itm" value="<%=(Recordset1.Fields.Item("CWAITX").Value)%>"/> <select name="percent" onFocus="startCalc4();"onBlur="stopCalc4();"> <option value="0">select</option> <option value="1.10">10%</option> <option value="1.25">25%</option> </select> </p> <p> <% If Not REcordset1.EOF Then Do while not REcordset1.EOF %> <input type="text" name="qty" value="<%=(Recordset1.Fields.Item("CWAJQT").Value)%>"onfocus="startCalc4();" onblur="stopCalc4();"/> <input name="prcbook" type="text" value="<%=(Recordset1.Fields.Item("CWKDVA").Value)%>"onfocus="startCalc4();" onblur="stopCalc4();"/> <input type="text" name="total" value=""/> </p> </form> </body> </html> <% REcordset1.MoveNext Loop End If %>

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  • Functional Methods on Collections

    - by GlenPeterson
    I'm learning Scala and am a little bewildered by all the methods (higher-order functions) available on the collections. Which ones produce more results than the original collection, which ones produce less, and which are most appropriate for a given problem? Though I'm studying Scala, I think this would pertain to most modern functional languages (Clojure, Haskell) and also to Java 8 which introduces these methods on Java collections. Specifically, right now I'm wondering about map with filter vs. fold/reduce. I was delighted that using foldRight() can yield the same result as a map(...).filter(...) with only one traversal of the underlying collection. But a friend pointed out that foldRight() may force sequential processing while map() is friendlier to being processed by multiple processors in parallel. Maybe this is why mapReduce() is so popular? More generally, I'm still sometimes surprised when I chain several of these methods together to get back a List(List()) or to pass a List(List()) and get back just a List(). For instance, when would I use: collection.map(a => a.map(b => ...)) vs. collection.map(a => ...).map(b => ...) The for/yield command does nothing to help this confusion. Am I asking about the difference between a "fold" and "unfold" operation? Am I trying to jam too many questions into one? I think there may be an underlying concept that, if I understood it, might answer all these questions, or at least tie the answers together.

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  • computationally expensive flash blocking javascript events

    - by jedierikb
    When I have a computationally expensive flash animation running in my page, sometimes javascript keyUp listeners on a textfield are not being fired. Keydown events are not lost. This only happens in IE8 (and IE7 in compatibility mode). I need those keyup listeners! How can I solve / workaround this problem? Ideas: query the textfield myself (without the broken listener) if the key is down or up? can I do this?

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  • Clear/Remove JavaScript Event Handler

    - by Jordan Terrell
    Greetings all - Given the following HTML fragment: <form id="aspnetForm" onsubmit="alert('On Submit Run!'); return true;"> I need to remove/clear the handler for the onsubmit event and register my own using jQuery or any other flavor of JavaScript usage. Anyone know how to do this? Thanks - Jordan

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  • JavaScript on the server-side like PHP

    - by Nathan Campos
    I'm now thinking to establish my server-side code in JavaScript, and begin to do all on it, but I want to know about its security and flexibility compared to PHP. I want to know too, if it can be successfully used to develop things like forum boards, full web-sites and things like this, as PHP does.

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  • remove element in javascript

    - by Hulk
    In the below code how to remove the hyperlink after getting the innerHTML function test(obj) { var a=obj.innerHTML // remove obj element here } $p = $('<a id="name" onclick="javascript:var ele=test(this);">').html( "test" ); $('#questions').append( $p ); Thanks..

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  • While Mouse press event. Prototype JS or Javascript

    - by nahum
    Hi, I would like to know if someone knows how to make a function repeat over and over while the mouse is press, I don't know how to make it work. I know in prototype you can take events like $('id').observe("click",function(event){}) $('id').observe("leave",function(event){}) $('id').observe("change",function(event){}) //etc... but is something like $('id').observe("whilemousepress",function(event){}) :P //I know there is not any event in javascript but I would like to emulate. thanks...

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  • Javascript Running slow in IE

    - by SharePoint Newbie
    Hi, Javascript is running extremely slow on IE on some pages in our site. Profiling seems to show that the following methods are taking the most time: (Method, count, inclusive time, exclusive time) JScript - window script block 2,332 237.98 184.98 getDimensions 4 33 33 eh 213 32 32 extend 446 30 30 tt_HideSrcTagsRecurs 1,362 26 26 String.split 794 18 18 $ 717 49 17 findElements 104 184.98 14 What does "JScript - window script block" do? We are using jquery and prototype. Thanks,

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  • Divs over images using JavaScript

    - by Abhi
    Say I have an image with a couple of dots in a web page. When someone clicks on the dots I want a JavaScript function to be executed and then a div placed over the clicked dot in the image. Something akin to markers in maps. How do I go about doing this?

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  • Capture link clickthrough events from Javascript

    - by Silver Dragon
    In order to track the overall user clickstream, I'd like to fire a javascript event, if the user right-clicks, and select "Open in new Tab" (or middle-clicks in most browsers) on a link. Most of these links are linking outside of my site, and I'd like to interfere with overall browser experience (such as: status bar, etc) as little as possible. What options are there to solve this?

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  • shuffling array javascript

    - by Dennis Callanan
    <!doctype html> <html lang="en"> <head> <meta charset="utf=8" /> <title>Blackjack</title> <link rel="stylesheet" href="blackjack.css" /> <script type="text/javascript"> var H2 = 2; var S2 = 2; var D2 = 2; var C2 = 2; var H3 = 3; var S3 = 3; var D3 = 3; var C3 = 3; var deck = new Array(H2, S2, D2, C2, H3, S3, D3, C3); var new_deck = new Array(); var r; document.write("deck = ") for (r =0; r<deck.length; r++){ document.write(deck[r]); } document.write("</br>") document.write("new deck = ") for (r=0; r<new_deck.length; r++){ document.write(new_deck[r]); } document.write("</br>") for (r=0;r<deck.length;r++){ var randomindex = Math.floor(Math.random()*deck.length); new_deck.push(randomindex) deck.pop(randomindex) } document.write("deck = ") for (r =0; r<deck.length; r++){ document.write(deck[r]); } document.write("</br>") document.write("new deck = ") for (r=0; r<new_deck.length; r++){ document.write(new_deck[r]); } document.write("</br>") </script> </head> <body> </body> </html> Obviously this isn't the full Blackjack game here. It's just a test to see if shuffling the array works by printing the contents of both decks (arrays) before and after the shuffle. I'm only using 8 cards at the moment, 4 2's and 4 3's. What I am getting from this is: deck = 22223333 new deck = deck = 2222 new deck = 7502 What I'm hoping to get is: deck = 22223333 new deck = deck = new deck = 23232323 (or any of the 8 numbers, generated randomly) So it should be shuffling those 8 cards, what am I doing wrong? I'm only new to javascript but I've used some python before. I've done something similar in python and worked perfectly, but I'm not sure what's wrong here. Thanks for any answers in advance!!

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  • Javascript get anchor href on click

    - by Infinity
    Hello guys! How can I get the href of an anchor when I click on it using javascript? I did the following: document.onClick = myFunc(); function myFunc() { } But how to extend the function to respond only to clicks on anchors and get the href?

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  • javascript object's - private methods: which way is better.

    - by Praveen Prasad
    (function () { function User() { //some properties } //private fn 1 User.prototype._aPrivateFn = function () { //private function defined just like a public function, //for convetion underscore character is added } //private function type 2 //a closure function _anotherPrivateFunction() { // do something } //public function User.prototype.APublicFunction = function () { //call private fn1 this._aPrivateFn(); //call private fn2 _anotherPrivateFunction(); } window.UserX = User; })(); //which of the two ways of defining private methods of a javascript object is better way, specially in sense of memory management and performance.

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  • JavaScript: catching URI change

    - by ptrn
    I have a site where I'm using hash based parameters, eg. http://url.of.site/#param1=123 What I want When the user manually changes the URI to eg. http://url.of.site/#param1=789 When the user enters this URI, the event is caught by the JavaScript, and the appropriate functions are called. Basically, what I'm wondering about is; is there an event listener for this? Or would I have to periodically check the URI to see if it has been changed? I'm already using the current jQuery API, if that helps. _L

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  • JavaScript: Keeping track of eventListeners on DOM elements

    - by bobthabuilda
    What is the best way to keep track of eventListener functions on DOM elements? Should I add a property to the element which references the function like this: var elem = document.getElementsByTagName( 'p' )[0]; function clickFn(){}; elem.listeners = { click: [clickFn, function(){}] }; elem.addEventListener( 'click', function(e){ clickFn(e); }, false ); Or should I store it in my own variable in my code like below: var elem = document.getElementsByTagName( 'p' )[0]; function clickFn(){}; // Using window for the sake of brevity, otherwise I wouldn't =D // DOM elements and their listeners are referenced here in a paired array window.listeners = [elem, { click: [clickFn, function(){}] }]; elem.addEventListener( 'click', function(e){ clickFn(e); }, false ); Obviously the second method would be less obtrusive, but it seems it could get intensive iterating through all those possibilities. Which is the best way and why? Is there a better way?

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  • Switching Javascript Function states

    - by webzide
    Dear experts, I would like to implement a API of Javascript that sort of resemble a light switch. For instance, there are two buttons on the actual HTML page act as the UI. Both of the buttons have event handlers that invokes a different function. Each function have codes that act like a state, for instance. button1.onclick=function (){ $("div").click( //code effects 2 ) } button2.onclick=function (){ $("div").click( //Code effects 2 ) } I the code works fine on the surface but the 2 state functions overlap. the effects is going to take place for the rest of the way until the next reload of the document. Basically what I want to achieve is that when 1 button is clicked, it will switch "OFF" the state of function invoked by the other button and vice versa. Thus, the effects achieved are unique are not overlapped. Is there anyway to achieve this or could any experts point me to the right direction. Thanks in advance.

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  • JavaScript local alias pattern

    - by Latest Microsoft Blogs
    Here’s a little pattern that is fairly common from JavaScript developers but that is not very well known from C# developers or people doing only occasional JavaScript development. In C#, you can use a “using” directive to create aliases of namespaces Read More......(read more)

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  • Best IDE for HTML, CSS, and Javascript for mac [closed]

    - by jon2512chua
    I'm currently looking to move to using an IDE for web development. The options I'm considering are: Aptana Studio Coda Expresso Please base your answers on the following criteria, in descending order of importance: Supports HTML, CSS, JavaScript Powerful (having good code completion, good debugger, great syntax highlighting etc) Fast and light Supports HTML5, CSS3, and major JavaScript frameworks (JQuery or YUI) Great design (both usability and aesthetics) Supports PHP, Ruby, and Python Has Git integrated I've updated the question to be more objective. I'm mainly looking for an answer that addresses how well each of the IDEs addresses my criteria.

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  • Learning how to integrate JavaScript with other languages

    - by beacon
    After learning JavaScript syntax, what are some good resources for learning about integrating JavaScript with other languages (HTML, XML, CSS, PHP) to create real, useful applications? I'm most interested in reading articles or other people's code - not so interested in books. Basically, I'm looking to move from programming puzzle-solvers to programming complex applications and could use some advice.

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