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  • javascript if statement

    - by mike
    Hi, In javascript, how can I test 2 "sets" of conditions in one if statement? example: if ((a == 'someValue' && b == 'someValue') || (c == 'someValue' && d == 'someValue')) { // do something } Thanks!

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  • JavaScript: Is there any "python's Generator" equivalent in JavaScript?

    - by JackSMTV
    Is there any "python's Generator" equivalent in JavaScript? PS: Python's Generator is very memory efficient when we need to do one time iterate through a big array, hash... "Generators are iterables, but you can only read them once. It's because they do not store all the values in memory, they generate the values on the fly" (Python's Generator explained in this thread: The Python yield keyword explained )

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  • Javascript syntax for abbreviating repeated access to same identifier

    - by yongjieli
    Hi all I wanted to ask if there is a formal way of describing the following code, whereby we can access the same object repeatedly without re-typing the object's identifier: myObj.render(1).render(2).print(); I didn't know how to describe it when trying to form a question; I wanted to know whether or not something like this is possible in javascript, I know that I can do it in VB: myObj.render(1) if(foo == 'bar') .render(2) .print(); Thanks!

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  • Javascript Date: Ensure getMinutes(), getHours(), getSeconds() puts 0 in front if necessary

    - by Mega Matt
    Hi all, Looking for a creative way to be sure values that come from the getHours, getMinutes, and getSeconds() method for the javascript Date object return "06" instead of 6 (for example). Are there any parameters that I don't know about? Obviously I could write a function that does it by checking the length and prepending a "0" if need be, but I thought there might be something more streamlined than that. Thanks.

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  • JavaScript 'contenteditable' -- Getting/Setting Caret Position

    - by OneNerd
    I have read a few posts on positioning the caret, but none seem to answer my particular issue. I have 2 divs (div1 and div2) div1 = noneditable div div2 = contenteditable div both divs contain exact same contents when user clicks on div1, it gets hidden, and div2 appears in exact location and user can edit The problem: I want the caret to appear in exact location on div2 as div1 So, I need some way to READ the location where the user clicks on div1, and then when div2 appears place the cursor/caret in that same location, so a getCaretLocation(in_div_id) and setCaretLocation(in_div_id) set of functions. Any way to do that? Thanks -

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  • Using a C#.net DLL in Node.js / serverside javascript

    - by Dve
    I have spent a while playing with node.js and exploring related frameworks such as express and geddy... and I am very impressed, especially with the WebSockets implementation in socket.io. I have a pet project that is an online game, the entire game engine is written in C# and I would like to know if there is anyway I can call the functions of this existing dll from a solution built using node.js, socket.io, express etc? The game engine itself is pretty complete; tested and robust. I am hoping there is some neat way of exposing its functionality without to much overhead. Thanks

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  • Accessing "Public" methods from "Private" methods in javascript class

    - by mon4goos
    Is there a way to call "public" javascript functions from "private" ones within a class? Check out the class below: function Class() { this.publicMethod = function() { alert("hello"); } privateMethod = function() { publicMethod(); } this.test = function() { privateMethod(); } } Here is the code I run: var class = new Class(); class.test(); Firebug gives this error: publicMethod is not defined: [Break on this error] publicMethod(); Is there some other way to call publicMethod() within privateMethod() without accessing the global class variable [i.e. class.publicMethod()]?

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  • Prototyping Object in Javascript breaks jQuery?

    - by blesh
    I have added a simple .js to my page that has some pretty mundane common-task sort of functions added to the Object and Array prototypes. Through trial and error I've figured out that adding any function to Object.prototype, no matter it's name or what it does causes javascript errors in jQuery: The culprit? Object.prototype.foo = function() { /*do nothing and break jQuery*/ }; The error I'm getting line 1056 of jquery-1.3.2.js, in the attr:function { } declaration: /*Object doesn't support this property or method*/ name = name.replace(/-([a-z])/ig, function(all, letter) { return letter.toUpperCase(); }); Apparently G.replace is undefined. While it's obvious that there's something I'm just not wrapping my head around with prototyping, I'm failing miserably to figure out what it is. To be clear, I'm not looking for a workaround, I have that handled... what I'm looking for is an answer to 'Why?'. Why does adding a function to Object.prototype break this bit of code?

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  • clear javascript console in Google Chrome

    - by Reigel
    Hi, I was wondering if I could clear up the console with some command.. console.log(), can print... is there a command to clear up console?.. I've tried to console.log(console); and got this functions below... assert: function assert() { [native code] } constructor: function Console() { [native code] } count: function count() { [native code] } debug: function debug() { [native code] } dir: function dir() { [native code] } dirxml: function dirxml() { [native code] } error: function error() { [native code] } group: function group() { [native code] } groupEnd: function groupEnd() { [native code] } info: function info() { [native code] } log: function log() { [native code] } markTimeline: function markTimeline() { [native code] } profile: function profile() { [native code] } profileEnd: function profileEnd() { [native code] } time: function time() { [native code] } timeEnd: function timeEnd() { [native code] } trace: function trace() { [native code] } warn: function warn() { [native code] } __proto__: Object [ I guess there's no way to clear up the console... but I wanted someone to say it to me... ]

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  • JavaScript setTimeout setInterval within one function

    - by dagoof
    I think I might be overtired but I cannot for the life of me make sense of this, and I think it's due to a lack of knowledge of javascript var itv=function(){ return setInterval(function(){ sys.puts('interval'); }, 1000); } var tout=function(itv){ return setTimeout(function(){ sys.puts('timeout'); clearInterval(itv); }, 5500); } With these two functions I can call a=tout(itv()); and get a looping timer to run for 5.5 seconds and then exit, essentially. By my logic, this should work but it simply is not var dotime=function(){ return setTimeout(function(){ clearInterval(function(){ return setInterval(function(){ sys.puts("interval"); }, 1000); }); }, 5500); } any insight in this matter would be appreciated.

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  • A better JavaScript version of addslashes and stripslashes?

    - by karlthorwald
    I am using these 2 functions: http://javascript.about.com/library/bladdslash.htm But JSLint complains 'Bad Escapement' on this line: str=str.replace(/\\0/g,'\0'); [Edit] I converted to 2 lines, and now the first line is the one that fails JLint: var rep = '\0'; str=str.replace(/\\0/g,rep); So it is the '\0' can you help? I could try something but I want to understand what is going on. [/Edit] Can you make a better version and explain? I would like a version that passes JSLint and still works.

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  • jQuery/Javascript framework efficiency

    - by Russell
    My latest project is using a javascript framework (jQuery), along with some plugins (validation, jquery-ui, datepicker, facebox, ...) to help make a modern web application. I am now finding pages loading slower than I am used to. After some js profiling (thanks VS2010!), it seems a lot of the time is taken procesing inside the framework. Now I understand the more complex the ui tools, the more processing needs to be done. The project is not yet at a large stage and I think would be average functions. At this stage I can see it is not going to scale well. I noticed things like the 'each' command in jQuery takes quite a lot of processing time. Have others experienced some extra latency using JS frameworks? How do I minimise their effect on page performance? Are there best practices on implementation using JS frameworks? Thanks

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  • Convert Double to String without precision loss in javascript

    - by holger
    I would like to convert a floating point variable to a string without losing any precision. I.e. I would like the string to have the same information as my floating point variable contains, since I use the output for further processing (even if it means that the string will be very long and readable). To put this more clearly, I would like to have functions for cyclic conversion var dA = 323423.23423423e4; var sA = toString(dA); var dnA = toDouble(sA); and I would like dnA and dA to be equal Thanks PS: Sources on the internet usually talk about how to round strings but I have not found information on exact representation. Also I am not interested in Arbitrary Precision calculations, I just need double precision floating point arithmetic.

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  • How to create Server-side Progress indicator in Javascript

    - by Eli
    Hey Guys, I want to create a section in my site, where a user has a few simple update buttons. Each of these update buttons will be going to the server, and will do a long crunching behind the scene. While the server crunches data, I want the user to have a some kind of progress indicator, like progress bar or textual percentage. I'm using jQuery as my javascript library, and CodeIgniter (PHP) as the server-side framework, if it's important... What I was thinking about is using PHP's flush() function to report progress status to jQuery, but I'm not sure that jQuery's ajax functions are reading the output before it's complete... So any advice/explanation would be useful and helpful! Thanks :)

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  • Javascript callback on blackberry

    - by Jeff
    I'm working on a mobile project, and I have a script that is dynamically generated on the backend and then appended to the document (the html page). Desktop browsers seem to append the script correctly and call any functions in the script, however, I can't get this to happen on Blackberry phones. I know that the script is being appending because I can alert it after I append it. I just can get it to call the function in the script. For example, if I have code like this: var scriptText = document.createElement('script'); scriptText.type = 'text/javascript'; scriptText.id = 'thisScript'; scriptText.innerHTML = 'alert("hello");'; document.getElementById('idName').appendChild(scriptText); alert(document.getElementById('thisScript')); //Alerts the script element. This will alert 'hello' in desktop browsers and even the iPhone/iPodTouch, but not BlackBerry's. Anyone have any idea why? Or if there's a fix/hack?

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  • ASP.NET Web User Control with Javascript used multiple times on a page - How to make javascript func

    - by Jason Summers
    I think I summed up the question in the title. Here is some further elaboration... I have a web user control that is used in multiple places, sometimes more than once on a given page. The web user control has a specific set of JavaScript functions (mostly jQuery code) that are containted within *.js files and automatically inserted into page headers. However, when I want to use the control more than once on a page, the *.js files are included 'n' number of times and, rightly so, the browser gets confused as to which control it's meant to be executing which function on. What do I need to do in order to resolve this problem? I've been staring at this all day and I'm at a loss. All comments greatly appreciated. Jason

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  • JavaScript try/catch: errors or exceptions?

    - by Josh
    OK. I may be splitting hairs here, but my code isn't consistent and I'd like to make it so. But before I do, I want to make sure I'm going the right way. In practice this doesn't matter, but this has been bothering me for a while so I figured I'd ask my peers... Every time I use a try... catch statement, in the catch block I always log a message to my internal console. However my log messages are not consistent. They either look like: catch(err) { DFTools.console.log("someMethod caught an error: ",err.message); ... or: catch(ex) { DFTools.console.log("someMethod caught an exception: ",ex.message); ... Obviously the code functions properly either way but it's starting to bother me that I sometimes refer to "errors" and sometimes to "exceptions". Like I said, maybe I'm splitting hairs but which is the proper terminology? "Exception", or "Error"?

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  • Overwriting arguments object for a Javascript function

    - by Ian Storm Taylor
    If I have the following: // Clean input. $.each(arguments, function(index, value) { arguments[index] = value.replace(/[\W\s]+/g, '').toLowerCase(); }); Would that be a bad thing to do? I have no further use for the uncleaned arguments in the function, and it would be nice not to create a useless copy of arguments just to use them, but are there any negative effects to doing this? Ideally I would have done this, but I'm guessing this runs into problems since arguments isn't really an Array: arguments = $.map(arguments, function(value) { return value.replace(/[\W\s]+/g, '').toLowerCase(); }); Thanks for any input. EDIT: I've just realized that both of these are now inside their own functions, so the arguments object has changed. Any way to do this without creating an unnecessary variable?

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  • Javascript: window.onload problem

    - by Matrym
    This isn't working in IE (although it does work in FFX). Why? Using HTML in the header: <script type="application/javascript"> // And finally, let's call the code ourselves. window.onload = lbp.init; </script> And then the script: // lbp is the script's universal variable, which retains everything var lbp = {}; // The sequence of functions to trigger lbp.init = function() { alert('hi'); } Thanks in advance for your help =)

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  • Inline javascript performance.

    - by Geromey
    I know it is better coding practice to avoid inline javascript like: <img id="the_image" onclick="do_this(true);return false;"/> I am thinking about switching this kind of stuff for bound jquery click events like: $("#the_image").bind("click",function(){ do_this(true); return false; }); Will I lose any performance if I bind a ton of click events? I am not worried about the time it takes to initially bind the events, but the response times between clicking and it happening. I bet if there is a difference, it is negligible, but I will have a ton of functions bound. I'm wondering if browsers treat the onclick attribute the same way as a bound event. Thanks

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