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  • Legitimate uses of the Function constructor

    - by Marcel Korpel
    As repeatedly said, it is considered bad practice to use the Function constructor (also see the ECMAScript Language Specification, 5th edition, § 15.3.2.1): new Function ([arg1[, arg2[, … argN]],] functionBody) (where all arguments are strings containing argument names and the last (or only) string contains the function body). To recapitulate, it is said to be slow, as explained by the Opera team: Each time […] the Function constructor is called on a string representing source code, the script engine must start the machinery that converts the source code to executable code. This is usually expensive for performance – easily a hundred times more expensive than a simple function call, for example. (Mark ‘Tarquin’ Wilton-Jones) Though it's not that bad, according to this post on MDC (I didn't test this myself using the current version of Firefox, though). Crockford adds that [t]he quoting conventions of the language make it very difficult to correctly express a function body as a string. In the string form, early error checking cannot be done. […] And it is wasteful of memory because each function requires its own independent implementation. Another difference is that a function defined by a Function constructor does not inherit any scope other than the global scope (which all functions inherit). (MDC) Apart from this, you have to be attentive to avoid injection of malicious code, when you create a new Function using dynamic contents. Lots of disadvantages and it is intelligible that ECMAScript 5 discourages the use of the Function constructor by throwing an exception when using it in strict mode (§ 13.1). That said, T.J. Crowder says in an answer that [t]here's almost never any need for the similar […] new Function(...), either, again except for some advanced edge cases. So, now I am wondering: what are these “advanced edge cases”? Are there legitimate uses of the Function constructor?

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  • Another IE Issue with AJAX

    - by Nik
    Alright, This code works in every browser except IE (again, to be expected). The code is supposed to refresh based on setInterval, and does so normally in all other browsers except IE, which just doesn't refresh. Can you spot the problem? var nick = document.getElementById("chatnick").value; var sessid = document.getElementById("sessid").value; var room = document.getElementById("roomid").value; function user_read() { $.ajax({ type: "GET", url: "methods.php", data: {method: "u", room: room}, dataType: "html", success: function (data, status, xhr) { $("#userwindow").html(data); setTimeout(user_read, 10000); } }); } function ajax_read() { $.ajax({ type: "GET", url: "methods.php", data: {method: "r", room: room}, dataType: "html", success: function (data, status, xhr) { $("#chatwindow").html(data); setTimeout(ajax_read, 400); } }); } function submit_msg() { var msg = document.getElementById("chatmsg").value; $.ajax({ type: "GET", url: "methods.php", data: {method: "w", room: room, m: msg, n: nick, sessid: sessid}, dataType: "html", success: function (data, status, xhr) { } }); document.getElementById("chatmsg").value = ""; } function keyup(arg1) { if (arg1 == 13) submit_msg(); } setTimeout(function(){ajax_read();}, 400); user_read();

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  • jQuery: tabs where the tab/content can be linked to

    - by Ricardo Zea
    My issue is simple. I have already implemented a tab system, and I'd probably spend more time implementing another one with the solution I need, than giving a shot at adapting the code I have, and learn something while asking :) My problem is that the tabs can't be linked to, I need to be able to link to a tab from another website or page, and have that tab get selected upon page load. ie: I have three tabs showing different products, by default tab 1 is active/selected when the page loads. From the home page I want to link to tab 2 but I can't link to tab 2 because it doesn't get selected. Not sure if that makes sense. Tabs: <ul> <li><a href="products.php">Product 1</a></li> <li><a href="products.php">Product 2</a></li> <li><a href="products.php">Product 3</a></li> </ul> <div class="tab_container"> <div id="tab1" class="tab_content">Product 1 info...</div> <div id="tab2" class="tab_content">Product 2 info...</div> <div id="tab3" class="tab_content">Product 3 info...</div> </div> my jQuery: $(document).ready(function() { //Default Action $(".tab_content").hide(); $("ul.tabs li:first").addClass("active").show(); $(".tab_content:first").show(); //On Click Event $("ul.tabs li").click(function() { $("ul.tabs li").removeClass("active"); $(this).addClass("active"); $(".tab_content").hide(); var activeTab = $(this).find("a").attr("href"); $(activeTab).fadeIn(); return false; }); }); Is there a way this code can be adapted to be able to link to any tab from anywhere and have that tab get selected when the page loads? Thanks in advance.

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  • Highstock Chrome/Firefox/Opera

    - by Matthias
    Is there any particular reason that this HighStock chart: var chart; $(function() { chart = new Highcharts.StockChart({ chart: { renderTo: 'container' }, title: { text: 'Total balance over time' }, xAxis: { type: 'datetime', maxZoom: 7 * 24 * 3600000, // one week title: { text: null } }, yAxis: { title: { text: 'Balance' }, startOnTick: false, showFirstLabel: false }, tooltip: { shared: true }, series: [{ type: 'area', name: 'Account balance', pointInterval: 14 * 3600 * 1000, pointStart: Date.UTC(2012, 3, 11), data: [ 0.7809, 0.7827, 0.7848, 0.785, 0.7873, 0.7894, 0.7907, 0.7909, 0.7947, 0.7987, 0.799, 0.7927, 0.79, 0.7878, 0.7878, 0.7907, 0.7922, 0.7937, 0.786, 0.787, 0.7838, 0.7838, 0.7837, 0.7836, 0.7806, 0.7825, 0.7798, 0.777, 0.777, 0.7772, 0.7793, 0.7788, 0.7785, 0.7832, 0.7865, 0.7865, 0.7853, 0.7847, 0.7809, 0.778, 0.7799, 0.78, 0.7801, 0.7765, 0.7785, 0.7811, 0.782, 0.7835, 0.7845, 0.7844, 0.782, 0.7811, 0.7795, 0.7794, 0.7806, 0.7794, 0.7794, 0.7778, 0.7793, 0.7808, 0.7824, 0.787, 0.7894, 0.7893, 0.7882, 0.7871, 0.7882, 0.7871, 0.7878, 0.79, 0.7901, 0.7898, 0.7879, 0.7886, 0.7858, 0.7814, 0.7825, 0.7826, 0.7826, 0.786, 0.7878, 0.7868, 0.7883, 0.7893, 0.7892, 0.7876, 0.785, 0.787, 0.7873, 0.7901, 0.7936, 0.7939, 0.7938, 0.7956, 0.7975, 0.7978, 0.7972, 0.7995, 0.7995 ] }] }); }); is rendered without any problems in Opera, but not working in Chrome or Firefox? I'm also using some HighChart pie charts. Those are rendered without any issues on all browsers. All of the demos on the HighStock Demo Gallery are working without problems.

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  • JQuery Validate: only takes the first addMethod?

    - by Neuquino
    Hi, I need to add multiple custom validations to one form. I have 2 definitions of addMethod. But it only takes the first one... here is the code. $(document).ready(function() { $.validator.addMethod("badSelectionB",function(){ var comboValues = []; for(var i=0;i<6;i++){ var id="comision_B_"+(i+1); var comboValue=document.getElementById(id).value; if($.inArray(comboValue,comboValues) != 0){ comboValues.push(comboValue); }else{ return false; } } return true; },"Seleccione una única prioridad por comisión."); $.validator.addMethod("badSelectionA",function(){ var comboValues = []; for(var i=0;i<6;i++){ var id="comision_A_"+(i+1); var comboValue=document.getElementById(id).value; if($.inArray(comboValue,comboValues) != 0){ comboValues.push(comboValue); }else{ return false; } } return true; },"Seleccione una única prioridad por comisión."); $("#inscripcionForm").validate( { rules : { nombre : "required", apellido : "required", dni : { required: true, digits: true, }, mail : { required : true, email : true, }, comision_A_6: { badSelectionA:true, }, comision_B_6: { badSelectionB: true, } }, messages : { nombre : "Ingrese su nombre.", apellido : "Ingrese su apellido.", dni : { required: "Ingrese su dni.", digits: "Ingrese solo números.", }, mail : { required : "Ingrese su correo electrónico.", email: "El correo electrónico ingresado no es válido." } }, }); }); Do you have any clue of what is happening? Thanks in advance,

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  • Raphael.js map default fill colors

    - by RIDER
    I am trying to familiarize myself with raphael.js. I want to create a USA map that already has default colors for each state and those colors stay there. Here is what I came up with. If you look at AK, I'm getting the default color loaded, but if I highlight another state, the default color for AK disappears. I want AK - and other states - to stay the same color. Specifically, I don't know what is clearing out my AK full color. I think part of this statement is clearing out the fill cover when I mouseover a different state: for (var state in aus) { //aus[state].color = Raphael.getColor(); (function (st, state) { st[0].style.cursor = "pointer"; st[0].onmouseover = function () { current && aus[current].animate({fill: "#333", stroke: "#666"}, 500) && (document.getElementById(current).style.display = ""); st.animate({fill: st.color, stroke: "#ccc"}, 500); st.toFront(); R.safari(); document.getElementById(state).style.display = "block"; current = state; }; })(aus[state], state); } Any ideas where I might be going wrong?

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  • Resizing canvas, where's the problem?

    - by Noor
    I'll post a link since theres to much to post here: http://hem.bredband.net/noor/canvas.htm My goal is to make the picture fit inside the window with the width of the image being the same as the window, even after resize. If the pictures height becomes to big for the window then the picture should resize itself according to the height and not the width. Somewhere along my code there is something wrong.. forgive me if this is stupid, i am still learning.. Thanks!

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  • Animation with Initial Velocity

    - by abustin
    I've been trying to solve this problem for a number of days now but I must be missing something. Known Variables: vi = Initial Velocity t = Animation Duration d = Distance The function I'm trying to create: D(t) = the current distance for a given time Using this information I want to be able to create a smooth animation curve with varying velocity (ease-in/ease-out). The animation must be able ease-in from an initial velocity. The animation must be exactly t seconds and must be travel exactly d units. The curve should lean towards the average velocity with acceleration occurring at the beginning and the end portions of the curve. I'm open to extra configuration variables. The best I've been able to come up with is something that doesn't factor in the initial velocity. I'm hoping someone smarter can help me out. ;) Thank you! p.s. I'm working with an ECMAScript variant

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  • "[object Object]" passed instead of the actual object as parameter

    - by Andrew Latham
    I am using Heroku with a Ruby on Rails application, and running from Safari. I have the following Ajax call: $.ajax({ type : 'POST', url : '/test_page', data : {stuff: arr1}, dataType : 'script' }); arr1 is supposed to be an array of objects. There's a console.log right before that, and it is: [Object, Object, Object, Object, Object, ...] However, I got an error on the server side when I made this ajax call. The logs showed 2012-10-01T03:13:34+00:00 app[web.1]: Parameters: {"stuff"=>"[object Object]"} 2012-10-01T03:13:34+00:00 app[web.1]: WARNING: Can't verify CSRF token authenticity 2012-10-01T03:13:34+00:00 app[web.1]: NoMethodError (undefined method `to_hash' for "[object Object]":String): 2012-10-01T03:13:34+00:00 app[web.1]: Completed 500 Internal Server Error in 1ms I'm unable to replicate the error. It's really confusing to me - what would cause that string to sometimes be passed to the server instead of the object?

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  • jquery version of array.contains

    - by morgancodes
    Can jquery test an array for the presence of an object (either as part of the core functionality or via an avaible plugin). Also, I'm looking for something like array.remove, which would remove a given object from an array. Can jquery handle this for me? thanks, -Morgan

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  • disallow selection inside an input element

    - by mkoryak
    I am looking to do the following Disallow text selection inside of an input element Do not show the cursor carrot inside of an input i cannot simply blur the input on click, focus must remain in the input. There is probably a way to do this in just IE, i would of course rather have a cross browser solution but ill settle for IE (or FF) only solution. Here is a demo page where you can see why i might need this functionality: http://programmingdrunk.com/current-projects/dropdownReplacement/ if you click on the dropdowns in the first row on page, you will see the carrot inside the dropdown which looks funny. (this wont happen in chrome, but will in FF or IE)

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  • jquery ajax encoding problem!

    - by teMkaa
    hi, i send ajax requests with jquery, and i have a function: $('input').ajaxSuccess(function(e, xhr, settings) { console.log(xhr.responseText); }); Ajax response ara russian letters in utf-8, all server (apache, php) and files are in utf-8 but response text is something like this: \u0421\u043b\u0438\u0448\u043a\u043e\u043c \u043c\u0430\u043b\u043e \u0431\u0443\u043a\u0432! how could i decode this characters to normal words? Thanks for help!

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  • Change bgcolor param value on mouse over?

    - by mr.matthewdavis
    I have a .SWF email submit form. The background color is set via: `<param name="bgcolor" value="#000000" />` and in the embed: `<embed src="FILE.swf" flashvars="STUFF" quality="high" **bgcolor="#000000"** width="260" height="32" name="WidgetMailBlack" align="middle" swLiveConnect="true" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />` Is it possible either on mouse over of the Object or a containing div to change those values? i.e. to #ffffff many thanks!

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  • Get status of servlet request before the response is returned

    - by Alex
    Good evening, I am in the process of writing a Java Servlet (Struts 2, Tomcat, JSP etc) which is capable of doing some fairly complex simulations. These can take up to 2 minutes to complete on the and will return a graph of the results. It is trivial to calculate the percentage of the simulation completed because the process works by repeating the same calculations 1000s of times. I would be interested to know if anyone has ever tried to use client side technology to provide any estimate of the percentage complete. I.e query the servlet processing to get the number of cycles completed at various point throughout the simulation. This could then be displayed as a bar in the client browser. Any thoughts, advice, resources would be much appreciated. Thanks, Alex

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  • Safari extension cookies not recognized/passed

    - by Alex
    I've recently been porting a Chrome extension to Safari, and encountered this kind of error (bug, feature, etc.) So, in global page i have a XMLHTTP request to a secure page which is available only after you login. Example: I simply login using browser - as usually you do on facebook or other secure pages After that, in global page, I load a login-only-available xmlhttp - and it says i'm not logged in it seems that global page somewhat has it's own cookies, so a secure page thinks i'm new ps: in Chrome i can load that page and it thinks i'm acting on behalf of logged in user, so i guess there are some restrictions in Safari pps: i heard there's a Block third-party cookies option in Safari, but even if i checked it to "Never block" it still doesn't work

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  • How to start/stop CrossSlide (jQuery)

    - by Alex
    I found that CrossSlide causes video playback on the same page to stutter quite badly. My thought was to have the cross slide effect on the same page stop or pause during video play back, annd then start again when video stops. Id doesn't look like there is any start stop function included. Does any one know how I might be able to accomplish this? Thanks.

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  • Assigning console.log to another object (Safari issue)

    - by Trevor Burnham
    I wanted to keep my logging statements as short as possible while preventing console from being accessed when it doesn't exist; I came up with the following solution: var _ = {}; if (console) { _.log = console.debug; } else { _.log = function() { } } To me, this seems quite elegant, and it works great in Firefox 3.6 (including preserving the line numbers that make console.debug more useful than console.log). But it doesn't work in Safari 4. (Haven't tested in other browsers yet.) If I follow the above with console.debug('A') _.log('B'); the first statement works fine in both browsers, but the second generates a "TypeError: Type Error" in Safari. Is this just a difference between how Firebug and the Safari Web Developer Tools implement console? If so, it is VERY annoying on Apple's part. (I get the same results in both browsers if I bind the console function to a prototype and then instantiate, rather than binding it directly to the object.) I could, of course, just call console.debug from an anonymous function assigned to _.log, but then I'd lose my line numbers. Any other ideas?

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  • keep HTMLformat after replace some text (using PHP and JS)

    - by Sadi
    I would like modify HTML like I am <b>Sadi, novice</b> programmer. to I am <b>Sadi, learner</b> programmer. To do it I will search using a string "novice programmer". How can I do it please? Any idea? Thank you Sadi More clarification: I get some nice reply with possible solution. But please keep posting if you have any idea in mind. I would like to more clarify the problem just in case anyone missed it. Main post shows the problem as an example scenario. 1) Now the problem is find and replace some string without considering the tags. The tags may shows up within a single word. String may contain multiple word. Tag only appear in the content string or the document. The search phrase never contain any tags. We can easily remove all tags and do some text operation. But here the another problem shows up. 2) The tags must be preserve, even after replacing the text. That is what the example shows. Thank you Again for helping

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  • Raphael.js: Adding a new custom element

    - by Claudia
    I would like to create a custom Raphael element, with custom properties and functions. This object must also contain predefined Raphael objects. For example, I would have a node class, that would contain a circle with text and some other elements inside it. The problem is to add this new object to a set. These demands are needed because non-Raphael objects cannot be added to sets. As a result, custom objects that can contain Raphael objects cannot be used. The code would look like this: var Node = function (paper) { // Coordinates & Dimensions this.x = 0, this.y = 0, this.radius = 0, this.draw = function () { this.entireSet = paper.set(); var circle = paper.circle(this.x, this.y, this.radius); this.circleObj = circle; this.entireSet.push(circle); var text = paper.text(this.x, this.y, this.text); this.entireSet.push(text); } // other functions } var NodeList = function(paper){ this.nodes = paper.set(), this.populateList = function(){ // in order to add a node to the set // the object must be of type Raphael object // otherwise the set will have no elements this.nodes.push(// new node) } this.nextNode = function(){ // ... } this.previousNode = function(){ // ... } }

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  • Accomplishing This Style of Drop-Down Menus in jQuery

    - by Maxim Z.
    I was browsing the web and found this site. I noticed how the nav bar drop-down works, and I want to implement something similar on my website. Afer going into the source code of the page, I found that those drop-down areas are contained in divs with class fOut. It turns out that this is being done with MooTools. Here is the script itself (referenced in the original page after the Mootools script itself): window.addEvent('domready', function() { $("primaryNav").getChildren("li").addEvents({ "mouseenter": function(){ $(this).addClass("hover").getChildren("a").addClass("hover"); }, "mouseleave": function(){ $(this).removeClass("hover").getChildren("a").removeClass("hover"); } }); $$(".fOut").each(function(el,i){ var ifr = $(document.createElement("iframe")); ifr.className = "ieBgIframe"; ifr.frameBorder = "0"; ifr.src="about:blank"; ifr.injectInside(el); var p = el.getParent(); p.addClass("hover"); var h = el.getSize().size.y; p.removeClass("hover"); ifr.height=h; }); $$(".olderVersionsToggle").addEvents({ "click": function(e){ var event = new Event(e); event.stop(); var p = $(this).getParent().getNext(); if(p.hasClass("open")){ p.removeClass("open"); $(this).setText("Show previous versions..."); } else{ p.addClass("open"); $(this).setText("Hide previous versions..."); } return false; } }); }); My Question(s) I have two questions about this code. How does it work? I don't quite understand what it's doing, with the iframes and all. How can this be implemented in jQuery?

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  • Interesting interview question. .Net

    - by rahul
    Coding Problem NumTrans There is an integer K. You are allowed to add to K any of its divisors not equal to 1and K. The same operation can be applied to the resulting number and so on. Notice that starting from the number 4, we can reach any composite number by applying several such operations. For example, the number 24 can be reached starting from 4 using 5 operations: 468121824 You will solve a more general problem. Given integers n and m, return the minimal number of the described operations necessary to transform n into m. Return -1 if m can't be obtained from n. Definition Method signature: int GetLeastCount (int n, int m) Constraints N will be between 4 and 100000, inclusive. M will be between N and 100000, inclusive. Examples 1) 4 576 Returns: 14 The shortest order of operations is: 468121827365481108162243324432576 2) 8748 83462 Returns: 10 The shortest order of operations is: 874813122196832624439366590497873283106834488346083462 3) 4 99991 Returns: -1 The number 99991 can't be obtained because it’s prime!

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