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• using a tileset with canvas

  - by Anonymous

  Yeah so I'm lost from the get-go. Alright let's say I have a big image with every tile for a 2D top-down RPG game. They're all the same width and everything. What I don't know is how would I save every individual tile from that image to their own image data for use on the canvas? Basically I want to take a big image with all my tiles, choose squares throughout it to make images out of the tiles, and store each image as a variable in an array. So, how would I do this?

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• Get next key-value pair in an object

  - by captainclam

  So, given a key, I want to find the next property in an object. Then, I want to return the value of the NEXT property. I can not rely on the keys to be ordered or sequential (they're uuids). Please see below for trivial example of what I want: var db ={ a: 1, b: 2, c: 3 } var next = function(db, key) { // ??? } next(db, 'a'); // I want 2 next(db, 'b'); // I want 3 I also want a prev() function, but I'm sure it will be the same solution. This seems like such a trivial problem but I can't for the life of me figure out how to do it. Happy for the solution to use underscore.js or be written in coffeescript :)

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• problem with inserting HTML with insertHTML

  - by bah

  Hi, I'm trying to make wysiwyg editor with content editable divs and I'm inserting html with document.execCommand('insertHTML', false, html); but the problem is, when i insert link, and then i want to write after it continues to write INSIDE that link. EXAMPLE: how it does now: Hello, stackoverflow.com MyTextAfterLink how it should be: Hello, stackoverflow.com MyTextAfterLink How could i fix this? Thanks.

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• How to I preload images where it actually forces the images to load before continuing (html/javascri

  - by Mr. Flibble

  I want to preload images but ensure they are loaded before continuing. How can I do this? The following does not work as it sends off the load request only, but doesn't wait till the image is loaded. So it is possible that the image isn't loaded when requested soon after. jQuery.preloadImages = function () { for (var i = 0; i < arguments.length; i++) { jQuery("<img>").attr("src", arguments[i]); } } $.preloadImages("img1.jpg","img2.jpg");

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• How to convert a string to variable name

  - by p1xelarchitect

  I'm loading several external JSON files and want to check if they have been successfully cached before the the next screen is displayed. My strategy is to check the name of the array to see if it an object. My code works perfectly when I check only a single array and hard code the array name into my function. My question is: how can i make this dynamic? not dynamic: (this works) $("document").ready(){ checkJSON("nav_items"); } function checkJSON(){ if(typeof nav_items == "object"){ // success... } } dynamic: (this doesn't work) $("document").ready(){ checkJSON("nav_items"); checkJSON("foo_items"); checkJSON("bar_items"); } function checkJSON(item){ if(typeof item == "object"){ // success... } } here is the a larger context of my code: var loadAttempts = 0; var reloadTimer = false; $("document").ready(){ checkJSON("nav_items"); } function checkJSON(item){ loadAttempts++; //if nav_items exists if(typeof nav_items == "object"){ //if a timer is running, kill it if(reloadTimer != false){ clearInterval(reloadTimer); reloadTimer = false; } console.log("found!!"); console.log(nav_items[1]); loadAttempts = 0; //reset // load next screen.... } //if nav_items does not yet exist, try 5 times, then give up! else { //set a timer if(reloadTimer == false){ reloadTimer = setInterval(function(){checkJSON(nav_items)},300); console.log(item + " not found. Attempts: " + loadAttempts ); } else { if(loadAttempts <= 5){ console.log(item + " not found. Attempts: " + loadAttempts ); } else { clearInterval(reloadTimer); reloadTimer = false; console.log("Giving up on " + item + "!!"); } } } }

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• How to remove expand on label click on TextNode YUI Treeview ?

  - by quilovnic

  I want to expand the Node only on click on Icon not on the label. With yahoo ui 2.7 : selfCategoryTree.tree.subscribe("labelClick", function(node) { alert(node.data.customData.id + " label was clicked"); }); So I catch the labelClick , I show an alert, but the Node is expanded.

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• parseInt('07')=='7', but parseInt('08')=='0'? why?

  - by KOHb

  Here's a simple script that gives a strange result: alert(parseInt('01')+' - '+parseInt('02')+' - '+parseInt('03')+' - '+parseInt('04')+' - '+parseInt('05')+' - '+parseInt('06')+' - '+parseInt('07')+' - '+parseInt('08')+' - '+parseInt('09')+' - '+parseInt('10')); I would expect it to give 1 - 2 - 3 and so on, but it gives me this (in FireFox, Chrome and IE6): 1 - 2 - 3 - 4 - 5 - 6 - 7 - 0 - 0 - 10 Can someone please explain me why?

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• How do I determine height and scrolling position of window in jQuery?

  - by One Crayon

  I need to grab the height of the window and the scrolling offset in jQuery, but I haven't had any luck finding this in the jQuery docs or Google. I'm 90% certain there's a way to access height and scrollTop for an element (presumably including the window), but I just can't find the specific reference. Any help is appreciated! Thanks!

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• jQuery: Load body of page into variable

  - by Nathan G.

  I'm using jQuery to load the result of a PHP script into a variable. The script is passed something that the user typed with a GET request. I want to take just what the script spit out into its <body> tag. Here's what I've tried: JS: function loader() { var typed = $('#i').val(); //get what user typed in $.get("script.php", {i: typed}, function(loaded) {dataloaded = loaded;}); alert($(dataloaded).find('body')) } But it just displays [Objec object]. How can I get a useful value that is just the contents of the body of a loaded page? I know the PHP works, I just need the JS. The script echos something like 1!!2 (two numbers separated by two exclamation points). Thanks!

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• mootools: $ not defined

  - by eaigner

  I've strange error i don't understand. I'm just moving my code from jQuery over to Mootools because it's much cleaner than the jQuery mess. Now when i use the $$('div.canvas') in mootools i get the correct element. When i try $(document).getElement('div.canvas') it tells me that $ is not defined. How can $$ and all helper functions like $lambda etc. be defined but not $? Has something changed there from 1.1 to 1.2 and the docs are not updated yet?

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• How to check if a Latitude/Longitude point is on the GRoute in Google Maps API?

  - by Pavel

  I'm ploting a route between two points and I need to check if the route goes through a predefiend location. In the api, each GStep has a start and end points but the path doesn't have to be straight. Given a Lat/Long point, is there a way to check if it intersects with a route?

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• Anyone know how to get the z-index of a div tag that returns the actual number and not 'Auto'?

  - by Derrick

  This gives me auto: I need the number, so I can move one above the other? // Swop div index $("#panel div").each(function(){ alert($(this).css('z-index')); });

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• Dropdown menu (SELECT element) not losing focus correctly in IE6

  - by devils-avacado

  Example (load in IE6): http://jsbin.com/uheco/14 In IE6, if the user clicks on a SELECT and does not click any OPTION but instead clicks somewhere else on the page outside the SELECT, the SELECT still has focus. I expected the SELECT to lose focus when I clicked once outside of it (such as in IEs 7 & 8).

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• JQuery: How do I use the JQuery delay with my own function?

  - by Timj

  How do I use the JQuery delay in conjunction with my own defined function, pseudo-code like so?: $('#foo').slideUp(300).delay(800).myOwnFunction(1,2,3); function myOwnFunction (a,b,c) {...} The code above doesn't work, however - per the JQuery documentation it appears like it should.

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• How to select all anchor tags with specific text

  - by geoff

  Given multiple anchor tags: <a class="myclass" href="...">My Text</a> How do I select the anchors matching the class and with some specific text. eg Select all anchors with the class:'myclass' and text:'My Text'

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• jQuery uses (new Function("return " + data))(); instead of eval(data); to parse JSON, why?

  - by Luca Matteis

  This link shows you that jQuery uses (new Function("return " + data))(); for older browsers, to parse a JSON string instead of eval(). What are the benefits of this? What if the JSON string isn't safe?

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• how to test rails js and ajax without a browser

  - by user1679052

  when i use rspec with capybara to test my rails js page , I got the following error: "Selenium::WebDriver::Error::WebDriverError: Could not find Firefox binary (os=linux). " Actually my rails script are all written on the linux server, where there is on brower installed, and any desktop software is not supported on the server (since no X11 is installed). How can I test js in this situation. Or is there and brower that works without X11 installed like wget? Thanks.

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• how to create a kml file for google-maps..

  - by zjm1126

  i want save my google map use kml file, but i don't know how to do .. thanks

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• How does this cross-domain request work ?

  - by Phonethics

  $.ajax( { url : "http://search.twitter.com/search.json?q=google&lang=en&rpp=10&since_id=&callback=?", dataType : 'json', success : function(data) { alert(data.results.length); } }); How exactly is this working ? I mean the cross-domain request.

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• How to get attributes of container in jquery ?

  - by Rachel

  How can I get attributes values from an container using jquery ? For example: I have container div as: div id = "zone-3a-2f-2f-2fPortal-2fPages-2fHome-2fZones-2fLeft-2f-7ccomponent-3a-2f-2f-2fSpm-2fComponents-2fPromotion-2f" class = "promotion" here how can I get attribute id value using jquery and than how can I trim the value to get component information ? Thanks.

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• how to handle large dataset like sproutcore

  - by Nik

  Hello all, I really don't have any substantial code to show here, actually, that's kinda why I am writing: I looked at the SproutCore demo, especially the Collection demo, on http://demo.sproutcore.com/sample_controls/, and am amazed by its loading 200,000 records to the page so easily. I tried using Rails to provide 200,000 records and in a completely blank HTML page with <% @projects.each do |p| % <%= p.title % <% end % that freezes the browser for seconds on my m1530 laptop with 4gb ram and t7700 256gb ssd. Yet the sproutcore demo does not freeze and takes less than 3 seconds to load. What do you think the one technique they are using to enable this is? Thanks!

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• How do I submit a form from another page?

  - by Tommy

  I have a two page site. Each page contains a header with "tabs" at the top, to navigate between page 1 and 2. When a tab is selected, I need the selected page to re-POST to the server, to quickly refresh before it is displayed. I have a form on each page that allows a manual refresh from that page but need to submit that form from the other page. For example, page 2 is displayed. The tab for page 1 is selected (which is on page 2) It should then submit the refresh form on page 1. Any help is appreciated. (Using jQuery, js, html and CSS)

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• Is there a way to give css syntax highlighting to any <textarea> using any bookmarklets?

  - by jitendra

  Is there a way to give css syntax highlighting to any <textarea> using any bookmarklets, Favlets? I work on CMS where i write and manage CSS in plain <textarea> like notepad? is there a boomarklets to get css syntax highlight in <textarea> temporarily.

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• How to to dump JS array... (boommarklet?)

  - by Soulhuntre

  A page on a site I use is holding some of my data hostage. Once I have logged into the site and navigated to the right page, the data I need is in the array eeData[] - it is 720 elements long (once every 2 minutes of a given day). Rather than simulate the requests to the underlying stuff json supplier and since its only once a day, I am happy to simply develop a bookmarklet to grab the data - preferably as a XML or CSV file. Any pointers to sample code or hints would help. I found a bookmarklet here that is based on this script that does part of this - but I am not up to speed on any potential JS file IO to see if it is possible to induce a file "download" of the data, or pop it opn in a new window I can copy / paste.

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• IE showing "decimal" instead of "comma"

  - by John Stewart

  I am having an issue with a slider (implemented using Prototype) and IE7. Upon the slider value change I update a with the value such as "420,000". Now on all browsers other than IE7 this is display correctly. But on IE7 it is displayed as "420.000" .. my question is how did the "," become "." the page has UTF-8 meta tag. Any help?

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