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  • How to read loaded image into a blob?

    - by Gajus Kuizinas
    I am facing same-origin policy restrictions when loading remote images. However DOM 0 Image object can be used to load a remote resource (this is essentially the same as creating an <img /> tag). var fr = new FileReader(), img = new Image(); img.src = 'http://distilleryimage8.s3.amazonaws.com/6cf25568491a11e2af8422000a9e28e9_7.jpg'; img.onload = function () { // how to get this image as a Blob object? }; Is there a way to read this resource into a Blob/arraybuffer object? This is not a duplicate of How to convert an image object to a binary blob as the latter does not rise with same-origin issues.

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  • How to use a variable in a function expression which is injected in a page?

    - by anonymous
    I'm trying to inject a function into a webpage via Chrome extension content script by: function inject(code) { var actualCode = '(' + code + ')();'; var script = document.createElement('script'); script.textContent = actualCode; (document.head||document.documentElement).appendChild(script); script.parentNode.removeChild(script); } var myObj = person; // myObj/person is passed in from elsewhere var fn = function() { alert(myObj.name); }; inject(fn); // myObj undefined My issue is, since fn is a function expression, I can't pass in myObj.personName. So my question is, how can I construct a function expression that includes a variable? Do I do some sort of string concatenation instead? I also tried to pass the object to the function, as follows: function inject(code, myObj) { var actualCode = '(' + code + ')(' + myObj +');'; ... But this did not work, and caused a "Uncaught SyntaxError: Unexpected identifier" error. Related: Building a Chrome Extension - Inject code in a page using a Content script

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  • How do I escape backslashes in JSON?

    - by peteb
    I am using Firefox's native JSON.parse() to parse some JSON strings that include regular expressions as values, for example: var test = JSON.parse('{"regex":"/\\d+/"}'); The '\d' in the above throws an exception with JSON.parse(), but works fine when I use eval (which is what I'm trying to avoid). What I want is to preserve the '\' in the regex - is there some other JSON-friendly way to escape it?

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  • redirection follow by post

    - by lucas
    hi, just wonder how those air ticket booking website redirect the user to the airline booking website and then fill up(i suppose doing POST) the required information so that the users will land on the booking page with origin/destination/date selected? Is the technique used is to open up new browser window and do a ajax POST from there? Thanks.

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  • GEvent.addListener(...) return?

    - by user354436
    Hello, my Question is as follows: What does GEvent.addListener(map, "click" function(){...}) return into the callback function? I don't find any information in the GMaps reference at all, can you show me some? The only thing I found out was that there are two parameters, "overlay" and "latLng" that are passed. The name of these parameters should not be of interest right? I could also name them "foo" and "bar" as far as I know. But the parameter "overlay" seems to be empty anyway? Also I have problems passing these two parameters directly into a callback function I created myself which looks like that... GEvent.addListener(gmap, "click", generateMarker(overlay, latLng)); ... instead of writing the following, which actually works fine. GEvent.addListener(gmap, "click", function(overlay, latLng) { generateMarker(overlay, latLng); });

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  • How to set default view in OpenLayers, WITHOUT restricting bounds?

    - by Jenny
    Based on samples, I can see that you can set a default view in OpenLayers by saying something along the lines of: var bounds = new OpenLayers.Bounds(-125, 25, -65, 50); var map = new OpenLayers.Map('map', {restrictedExtent: bounds }); However, this also (as the name implies), restricts me to be able to ONLY navigate within these bounds. I can zoom out and see things outside of these bounds, but I can't then zoom back onto them, or scroll to them. I've tried not having any restrictedExtent (or making it the entire map), but then I can't get it to focus on the area I want. I tried using: map.setCenter(new OpenLayers.LonLat(0,0), 3); console.log(map.getCenter()); To set the zoom and the center...but it doesn't seem to do ANYTHING, other than set the variable "center" which I can then read from map.getCenter() (if I don't set it, it's null, if I do set it, I can see it...but the map itself stays fully extended and it's center doesn't seem to change at all...) The Map layer I am using is: OpenLayers.Layer.OSM.Mapnik with displayOutsideMaxExtent set to true... I'm really at a loss here. My goal is to have a default region of the world zoomed in to and in view (such as the United States), with the option of viewers being able to go outside the default to view things.

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  • Loading scripts using jQuery

    - by Nimbuz
    $.ajax({ url: "plugin.js", dataType: 'script', cache: true, success: function() { alert('loaded'); }}); 1) I can't get the script to load, probably due to incorrect path, but how do I determine the correct path? The above code is in init.js, plugin.js is also in the same folder. 2) Can I load multiple plugins at once with the same request? eg. plugin.js, anotherplugin.js? Thanks for your help

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  • Assigning function within function object without invoking the function itself.

    - by webzide
    Dear experts, I am trying to assign an function within an function object property without actually invoking then function itself. for instance, I have the following function object class definition function objectOne(name, value, id){ this.name=name; this.value=value; this.id=id; this.methodOne=methodFunction(this); } the last line this.methodOne=methodFunction(this); I want to pass the current object to the function but at the same time i don't want to execute the function right now. But if I do it this way without the bracket this.methodOne=methodFunction then the argument of this object would not be passed as a parameter to the function. Is there a way to work through this. Thank you in advance

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  • Can't parse XML from AJAX response.

    - by Pavel
    Hi everyone. I'm having some problems with parsing the xml response from my ajax script. The XML looks like this: <IMAGE> <a href="address"> <img width="300" height="300" src="image.png class="image" alt="" title="LINKING"/> </a> </IMAGE> <LINK> www.address.com </LINK> <TITLE> This <i>is title</i> </TITLE> <EXCERPT> <p> And some excerpt </p> </EXCERPT> The code for js looks like this. function loadTab(id) { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { xmlDoc=xmlhttp.responseXML; var title=""; var image=""; x=xmlDoc.getElementsByTagName("TITLE"); for (i=0;i<1;i++) { title=title + x[i].childNodes[0].nodeValue; } document.getElementById("ntt").innerHTML=title; x1=xmlDoc.getElementsByTagName("IMAGE"); for (j=0;j<1;j++) { image=image + x1[j].childNodes[0].nodeValue; } document.getElementById("nttI").innerHTML=image; } } var url = 'http://www.factmag.com/staging/page/?id='+id; xmlhttp.open("GET",url,true); xmlhttp.send(); } When I'm parsing it it pulls out the title but not the IMAGE tag contents. What I'm doing wrong? Can someone please tell me? Thanks in advance!

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  • auto reload: how it works?

    - by Syom
    i need to change something in my site, if some fields changed in database, but without reloading the page! but i have no idea how i can do it. could you give me an idea? thanks

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  • Preparing for a C#, ASP.NET, JavaScript interview

    - by halivingston
    I have an interview I'm prepping for, I've written A LOT of code, specifically in C# and ASP.NET. I've written fair amounts of JavaScript, but no OO stuff in it. So I'm definately going to brush up on that. I remember for a previous job interview, I was asked Java questions, like not super intricate, but detailed stuff. Now I'm looking for a book maybe that I can read through in a day (or two) and known all the crannies of C#, ASP.NET and JavaScript. Different books obviously I'll be honest, for the Java interview, I actually read The J2EE certification book, and it helped A LOT!

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  • unable to set href inside click event of Jquery

    - by akshatrautela
    Hi I am trying to set href using Jquery inside click event of RadioButtonList but that doesnt work If I take the same code to document.ready event it works fine but not in click event. Please advice. $(document).ready(function() { url = "Results.aspx?latitude=" +latitude + "&Longitude=" + longitude; $("a[href='http://www.google.com/']").attr("href", url); // this works.. } $('.rbl input').click(function() { id = $(this).parent().children("input").val(); url = "Results.aspx?latitude=" + latitude + "&Longitude=" + longitude + "&ServiceCenterProductTypeId=" + id; //alert(url); $("a[href='http://www.google.com/']").attr("href", url); //this doesnt work.... }); });

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  • Expanding videoplayer like CNN-website, prerably jQuery-based

    - by Nils
    I'm wondering if anyone knows of a script/plugin, jquery-based or otherwise, which could be used to achive the effect that can be found on CNN.com. I'm talking about the videos that are representet by a small thumbnail, that when clicked expands in to the text and plays. I'm by no means a JS-guru, and me and flash isn't the bestest of friends, but I'm not completly cluess. Essentially, what im looking for is a way to click a thumbnail, expand a swf, and stop it if i contract it again. something like that. ANY ideas, tips or insights are welcome!

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  • Multiple Regex on String

    - by George
    How can I apply multiple regexs to a single string? For instance, a user inputs the following into a text area: red bird blue cat black dog and I want to replace each carriage return with a comma and each space with an underscore so the final string reads as red_bird,blue_cat,black_dog. I've tried variations in syntax along the lines of the following so far: function formatTextArea() { var textString = document.getElementById('userinput').value; var formatText = textString.replace( new RegExp( "\\n", "g" ),",", new RegExp( "\\s", "g"),"_"); alert(formatText); }

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  • sifr3 text doesn't load on first try?

    - by metal-gear-solid
    sifr3 text doesn't load many time first time on FF 3.5? I haven't checked on other browser. If i reload page again then it loads properly. this is my code sIFR.replace(futura, { selector: '#Homepage h1', ratios: [6, 1.24, 9, 1.13, 10, 1.15, 16, 1.09, 21, 1.06, 22, 1.07, 25, 1.04, 26, 1.06, 29, 1.03, 30, 1.05, 31, 1.03, 32, 1.05, 41, 1.04, 58, 1.03, 97, 1.02, 1.01], wmode: 'transparent', css: '.sIFR-root { background-color: none; color: #ffffff; }' });

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  • Is there a unified way to know if a node is visible or not?

    - by zneak
    Hello guys, I'd like to be able to know if a node is visible and rendered on screen. As far as I know, there are at least 3 standard and easy ways of making HTML nodes not visible: Setting opacity: 0; Setting display: none; Setting visibility: hidden. I could check for just these three, but I'm afraid people can get creative when it comes to ways of hiding contents: Sending the element offscreen using negative margins; Using a width or height of 0 and hiding overflow; many more I trust people to have developed. So I was wondering if there is a standard way of determining if a node is rendered to the screen. I'm pretty sure all major browsers determine it for themselves to accelerate drawing, so maybe it's somehow exposed.

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  • Why do spaces appear in my string?

    - by Abs
    Hello all, I have this function below which returns all IDs of checked boxes on my page seperated by a comma. It works great but the problem is, it seems to put a lot of white space after each checkbox ID. I can't seem to figure out why? /*Returns selected checkbox ID in string seperated by comma */ function get_selected_chkbox(){ var checked_string = ''; $('#report_table').find("input[type='checkbox']").each(function(){ if(this.checked){ checked_string = checked_string + this.id + ','; } }); alert(checked_string);//test1 ,test2 , return checked_string; } Thanks all for any help

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  • Page fully re-rendered event?

    - by alex
    I'm altering the DOM tree in plain JS and need to know when the changes get fully rendered on screen (mostly care about document dimensions). window.onload=function(){ ss = document.styleSheets[0]; for(i = 0; i < ss.cssRules.length; i++) { ss.deleteRule(i) }; ss.addRule('p', 'color: red;') // ... many more // call some other function when the page is fully rendered? } TIA.

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  • IE7 - jquery addClass() breaks floating elements

    - by Patrick
    I have this nav that uses addClass('hover') when the mouse is rolled over an item. This works fine except in IE7 when the addClass function is called every element with float:left stops floating and the page totally loses its structure. This is my JS: _this.position_sub_menus = function(){ $('#header #nav > ul > li').mouseenter( function(e){ pos = $(this).offset(); height = $(this).height(); lvl2 = '#' + $(this).attr('id') + '-submenu'; if( $(this).position().left > ($('#nav').width()/2)){ pos.left = pos.left - $(lvl2).width() + $(this).width(); } $(this).addClass('hover'); $(lvl2).show(); $(lvl2).css( { 'left' : (pos.left - 12) + 'px', 'top' : pos.top + height + 'px'}); } ); This is the CSS of the of the elements that break: display: inline; float: left; margin-left: 10px; margin-right: 10px; position: relative; It's CSS from the 960 grid system. When I comment out the $(this).addClass('hover'); line the floated elements dont break. Is anyone familiar with this IE7 problem? Thanks guys

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  • close other infowindows nicely.

    - by raklos
    Im currently doing this to create markers for my google map. function createMarker(posn, title, html) { var marker = new google.maps.Marker({ position: posn, title: title, draggable: false }); marker['infowindow'] = new google.maps.InfoWindow({ content: html }); infoWindows.push(marker['infowindow']); google.maps.event.addListener(marker, "click", function () { for (i = 0; i < infoWindows.length; i++) { infoWindows[i].close(); } this['infowindow'].open(map, this); }); return marker; } im not happy with the for loop, for closing the markers, i know something similar to this can be done by using one refernce: if (infowindow) infowindow.close(); the reason I am using code like above is because i am doing something like markers[myPoint]['infowindow'].open(map, markers[myPoint]); else where, (myPoint is a number). how can i avoid this for loop to close open infowindows and do it the nice way?

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  • autoTab and allowed only numbers

    - by Abu Hamzah
    is there any easy way of implementing two feature 1) auto tab and 2) allowed only numbers i have a SSN box below as soon as the user enter three digits will skip to the next .. so on and so forth..... <TR> <TD nowrap><b>Social Security Number</b></TD> <TD align="left" nowrap colspan="4"> <INPUT NAME= "SSN1" TYPE= "TEXT" SIZE= "3" MAXLENGTH= "3" VALUE= ""> <INPUT NAME= "SSN2" TYPE= "TEXT" SIZE= "2" MAXLENGTH= "2" VALUE= ""> <INPUT NAME= "SSN3" TYPE= "TEXT" SIZE= "4" MAXLENGTH= "4" VALUE= ""> </TD> </tr> also i wanted to restrict to have only numbers.

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