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• Music and Mathematics. Finding the natural scale generator. The best way?

  - by Alfonso de la Osa

  Hi! I wrote this post Music and Mathematics, finding the Natural and the Pentatonic scales. Is a method to find the Natural scale. I want to discuss it and find if its true. This is the code of the reasoning in js. <script> var c = 12/7; var tot = 0; var scale = []; while(tot < (14 - c)){ tot += c; scale.push(Math.round(tot)); } if(scale.length == 8){ document.write(scale + " " + c + "<br />"); } </script>

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• javascript image toggling

  - by Sunil Ramu

  I have a tree view which has a folder icon by default and once clicked it has to be changed to a checkbox icon. And further on clicking the checkbox icon should display a folder icon. Sample Code, Server side : c# htmlSb.AppendFormat(" {0}", emptyContent); JS code var Test= new Object(); Test.Controls=new Object(); Test.Controls.TreeView = new Object(); **Test.Controls.TreeView.SelectNode = function (TreeId, nodeLabel) { $("#" + TreeId + " li span, ul li span").css("background-color", "transparent"); nodeLabel.style.backgroundColor = "white"; nodeLabel.style.background = "url(../images/selected.gif) 0 0 no-repeat"; }** The other Image : if (nodeLabel.style.background = "url(../images/folderclosed.gif) 0 0 no-repeat") I need to toggle between "selected.gif" and "folderclosed.gif" images. If one is clicked the other should display. and vice versa. Please help.

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• Widget -what to do and what not

  - by mkoso

  I would like to make a html/js widget that people can add to their blogs, sites etc. I have never made widgets before so I would like to hear what should be done and what not. For example, how do I make the styling? Inline, own css file or what is the best practise? I believe i cant use head and body stuff in it. What about h1, h2 etc? Do they screw the website that has the widget or can i use them? If you have any good tips I would like to hear those. Thanks.

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• javascript and extJs - scope question

  - by ben

  Hi guys, I got a little scope related problem with some js code, maybe somebody can explain to me what I'm making wrong: I'm using extJs and got this snippet: Ext.onReady(function(){ // Form for filter selection var formFilter = new Ext.FormPanel({ // ... items: [ cbGroup = new Ext.form.ComboBox({ fieldLabel: 'Group', store: dsGroups, displayField: 'name', valueField: 'number', emptyText : '- Please choose a group -', listeners:{ 'select': function() { alert(cbGroup.selectedIndex +' '+this.selectedIndex); } } }) ] }); }); The problem: When I access the combobox over 'this' within the listener function, I get the correct result for the selectIndex property. When I access the combobox over it's var name, I allways get the result '-1'. Thank a lot for your help!

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• Use one submit button to enter various pages in Javascript

  - by Kelvin

  Hiya: I want to enter different rooms with on button. How is this possible in Javascript. For example, there are three rooms, "Kitchen, toilet and bedroom". How can I use JS to enter any of these rooms depending on my choice. This is the HTML input, <form method="post"> <input style=""name="Text1" type="text"><br> <input name="move" style="height: 23px" type="submit" value="Move"> </form>

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• Javascript Canvas Element - Array Of Images

  - by Ben Shelock

  I'm just learning JS, trying to do things without jQuery, and I want to make something similar to this however I want to use an array of images instead of just the one. My image array is formed like this var image_array = new Array() image_array[0] = "image1.jpg" image_array[1] = "image2.jpg" And the canvas element is written like this. (Pretty much entirely taken from the Mozilla site) function draw() { var ctx = document.getElementById('canvas').getContext('2d'); var img = new Image(); img.src = 'sample.png'; img.onload = function(){ for (i=0;i<5;i++){ for (j=0;j<9;j++){ ctx.drawImage(img,j*126,i*126,126,126); } } } } It uses the image "sample.png" in that code but I want to change it to display an image from the array. Displaying a different one each time it loops. Apoligies if I've not explained this well.

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• JQuery with SMARTY php

  - by out_sider

  This might seem a very noob question but I haven't found the answer yet. I have a header.tpl file which contains xhtml code. I want to and some java script to it using jquery. But my problem is that it simple doesn't happen what I tell it to do. Because the page hoster comiples php with SMARTY I had to make a small change to the block script, which was had the {literal} {/literal}. But the rest seems ok. Btw the jquery.js is on the same folder as the header.tpl. File header.tpl http://feupload.fe.up.pt/get/SQWJvybQkDCmjEG PS: I event replaced all the code by the getstarted tutorial on the jquery homepage and added the {literlar} {/literal} (otherwise it would give an error) and it steel didn't work

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• Catch and Show an error from a WCF service call in javascript.

  - by cw

  Hello, I'm calling a WCF service through javascript and right now it's not showing any errors that might occur on the service side to the user. I have the code below and am looking for a better way to inform the user an error has occured, including the call stack and error message if possible. The service itself throws a FaultException if an error has occured. However, I want to catch that error in the javascript call and show it to the user. Here is the js code to call the service function Save() { var saveInfo = $("._saveInfo").val() app.namspace.interfacetoservice.Save( saveInfo, function(results) { if (results == true) { window.close(); } else { alert("error saving"); } } ); } Thanks for the help!

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• GlassFish JDO and global object

  - by bach

  Hi, I'm thinking about the GlassFish platform for my new app. My app env. doesn't have a big volume of data to handle, but a lot of users writing/reading the same data A very volotile portion of the data updates every 200milsec by diff users. Therefore I'd like that type of data to be in memory only and accessible to the whole app My questions: How do I use a global object in memory with GF? a. use a static variable object - for that I guess I need to make sure GF is running on only 1 JVM -- how to I configure GF to run on 1 jvm? b. use HttpContext - same as a. How do I persist to the DB? a. can I use JDO interface? How do I Schedule tasks to be performed in the future (something like the task queue in GAE) thanks, J.S. Bach

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• Why is Varnish not caching?

  - by Justin

  I am troubleshooting the setup of Varnish 3.x on my Ubuntu server. I'm running Drupal 7 on two sites set up on the box, via named-based vhosts. Before trying to get Varnish to play nice with Drupal I'm trying to just get Varnish to a PNG from cache. Here are the headers I get from a curl -I request of the PNG file: HTTP/1.1 200 OK Server: Apache/2.2.22 (Ubuntu) Last-Modified: Sun, 07 Oct 2012 21:18:59 GMT ETag: "a57c2-3850-4cb7ea73db6c0" Accept-Ranges: bytes Content-Length: 14416 Cache-Control: max-age=1209600 Expires: Thu, 25 Oct 2012 22:55:14 GMT Content-Type: image/png Accept-Ranges: bytes Date: Thu, 11 Oct 2012 22:55:14 GMT X-Varnish: 1766703058 Age: 0 Via: 1.1 varnish Connection: keep-alive X-Varnish-Cache: MISS Here is the Varnish VCL file I'm using (It's a default VCL configuration designed for Drupal): # Default backend definition. Set this to point to your content # server. # backend default { .host = "127.0.0.1"; .port = "8080"; } # Respond to incoming requests. sub vcl_recv { # Use anonymous, cached pages if all backends are down. if (!req.backend.healthy) { unset req.http.Cookie; } # Allow the backend to serve up stale content if it is responding slowly. set req.grace = 6h; # Pipe these paths directly to Apache for streaming. #if (req.url ~ "^/admin/content/backup_migrate/export") { # return (pipe); #} # Do not cache these paths. if (req.url ~ "^/status\.php$" || req.url ~ "^/update\.php$" || req.url ~ "^/admin$" || req.url ~ "^/admin/.*$" || req.url ~ "^/flag/.*$" || req.url ~ "^.*/ajax/.*$" || req.url ~ "^.*/ahah/.*$") { return (pass); } # Do not allow outside access to cron.php or install.php. #if (req.url ~ "^/(cron|install)\.php$" && !client.ip ~ internal) { # Have Varnish throw the error directly. # error 404 "Page not found."; # Use a custom error page that you've defined in Drupal at the path "404". # set req.url = "/404"; #} # Always cache the following file types for all users. This list of extensions # appears twice, once here and again in vcl_fetch so make sure you edit both # and keep them equal. if (req.url ~ "(?i)\.(pdf|asc|dat|txt|doc|xls|ppt|tgz|csv|png|gif|jpeg|jpg|ico|swf|css|js)(\?.*)?$") { unset req.http.Cookie; } # Remove all cookies that Drupal doesn't need to know about. We explicitly # list the ones that Drupal does need, the SESS and NO_CACHE. If, after # running this code we find that either of these two cookies remains, we # will pass as the page cannot be cached. if (req.http.Cookie) { # 1. Append a semi-colon to the front of the cookie string. # 2. Remove all spaces that appear after semi-colons. # 3. Match the cookies we want to keep, adding the space we removed # previously back. (\1) is first matching group in the regsuball. # 4. Remove all other cookies, identifying them by the fact that they have # no space after the preceding semi-colon. # 5. Remove all spaces and semi-colons from the beginning and end of the # cookie string. set req.http.Cookie = ";" + req.http.Cookie; set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";"); set req.http.Cookie = regsuball(req.http.Cookie, ";(SESS[a-z0-9]+|SSESS[a-z0-9]+|NO_CACHE)=", "; \1="); set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", ""); set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", ""); if (req.http.Cookie == "") { # If there are no remaining cookies, remove the cookie header. If there # aren't any cookie headers, Varnish's default behavior will be to cache # the page. unset req.http.Cookie; } else { # If there is any cookies left (a session or NO_CACHE cookie), do not # cache the page. Pass it on to Apache directly. return (pass); } } } # Set a header to track a cache HIT/MISS. sub vcl_deliver { if (obj.hits > 0) { set resp.http.X-Varnish-Cache = "HIT"; } else { set resp.http.X-Varnish-Cache = "MISS"; } } # Code determining what to do when serving items from the Apache servers. # beresp == Back-end response from the web server. sub vcl_fetch { # We need this to cache 404s, 301s, 500s. Otherwise, depending on backend but # definitely in Drupal's case these responses are not cacheable by default. if (beresp.status == 404 || beresp.status == 301 || beresp.status == 500) { set beresp.ttl = 10m; } # Don't allow static files to set cookies. # (?i) denotes case insensitive in PCRE (perl compatible regular expressions). # This list of extensions appears twice, once here and again in vcl_recv so # make sure you edit both and keep them equal. if (req.url ~ "(?i)\.(pdf|asc|dat|txt|doc|xls|ppt|tgz|csv|png|gif|jpeg|jpg|ico|swf|css|js)(\?.*)?$") { unset beresp.http.set-cookie; } # Allow items to be stale if needed. set beresp.grace = 6h; } # In the event of an error, show friendlier messages. sub vcl_error { # Redirect to some other URL in the case of a homepage failure. #if (req.url ~ "^/?$") { # set obj.status = 302; # set obj.http.Location = "http://backup.example.com/"; #} # Otherwise redirect to the homepage, which will likely be in the cache. set obj.http.Content-Type = "text/html; charset=utf-8"; synthetic {" <html> <head> <title>Page Unavailable</title> <style> body { background: #303030; text-align: center; color: white; } #page { border: 1px solid #CCC; width: 500px; margin: 100px auto 0; padding: 30px; background: #323232; } a, a:link, a:visited { color: #CCC; } .error { color: #222; } </style> </head> <body onload="setTimeout(function() { window.location = '/' }, 5000)"> <div id="page"> <h1 class="title">Page Unavailable</h1> <p>The page you requested is temporarily unavailable.</p> <p>We're redirecting you to the <a href="/">homepage</a> in 5 seconds.</p> <div class="error">(Error "} + obj.status + " " + obj.response + {")</div> </div> </body> </html> "}; return (deliver); } I'm getting a MISS and age 0 every time. If I'm understanding correctly, this means the file isn't being returned from Varnish's cache. Is there a problem with my Varnish config?

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• Storing DOM reference elements in Javascript array

  - by webzide

  Dear experts, I was trying to dynamically generate DOM elements using JS. I read from Douglas Crockford's book that DOM is very very poorly structured. Anyways, I would like to create a number of DIVISION elements and store the reference into an array so it could be accessed later. Here's the code for(i=0;i<3;i++){ var div=document.body.appendChild(document.createElement("div")); var arr=new Array(); arr.push(div); } Somehow this would not work..... There is only 1 div element created. When I use the arr.length to test the code there is only 1 element in the array. Is there another way to accomplish this. THanks in advance

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• Making JSON Feed Work Server to Server

  - by Oscar Godson

  I have a JSON feed (which I don't directly control, I have to ask the server admins to update it), that is returning NULL, or otherwise not working when I try to access it from another server. The actual feed works fine, but I can't get it to work like a normal API. Why can I use Flickr, WhitePages, Twitter, etc's JSON APIs, but for: http://portlandoregon.gov/shared/cfm/json.cfm It returns NULL in the browser when using JS. If I call it on the same server, it's fine though. If this is a server issue, what do I ask the admins to change, and if this is a local (browser) based issue, what am I doing wrong for this one feed that works for every other JSON API?

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• JavaScript array to PHP array then process in PHP and return

  - by Constructor

  Example: javascript: var mycourses=new Array(); mycourses[0]="History"; mycourses[1]="Math"; mycourses[1][0]="Introduction to math"; mycourses[1][1]="Math 2"; mycourses[1][2]="Math 3"; PHP will then run these values through functions (please note values are mostly not strings as in the example above but rather numbers), the functions will return some text which will than be displayed in a form How should I go about doing this? p.s.: I found some similar stuff, but nothing quite like this... as far as I see I will have to use JSON (is there a way to code it from JS automatically - saw this for strings) and AJAX

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• customisable JSLint

  - by Don

  Hi, I'm looking for a tool that checks JS code, which can be integrated into a Maven build. I need a tool that will check for errors such as use of reserved words as identifiers trailing semi-colon, e.g. var obj = { a: 1, b, 2, } JSLint seems like a perfect candidate, but the problem is that it is too strict, because it also checks for various coding patterns which are (arguably) bad style, but do not actually generate errors in a browser. Examples of such issues include Disallow ++ and -- and Allow one var statement per function If possible, I would like the errors to fail the build, and I would like the other rules to only print warnings (or disable them completely). Obviously, I need the ability to specify which of the available rules I consider errors and which I consider warnings. Thanks, Don

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• Cross-Browser jQuery text-zoom implementation

  - by JMC Creative

  I've got some code to increase/decrease font size. This is giving me a headache because each browser seems to implement the $.css('font-size') differently (see jquery bug). The part that's really killing me, though, is that Firefox is scaling up okay, but when I use the scale down function below, it scales up. Webkit & IE are both working as expected. Any ideas on that? I put this in a fiddle here: http://jsfiddle.net/srQ3P/1/ where you can see it working as expected, and you can see it broken in firefox at the project page: http://cumberlandme.info/residents MAJOR EDIT Sorry, the issue is not the code, it's firefox buggy behavior. After I zoom in or out with the browser controls (ctrl + plus or ctrol + minus) the js goes haywire. This doesn't happen in other browsers. This is the real issue. Any advice on that

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• I cannot get this Jquery Image ComboBox to Work

  - by WillingLearner

  Im trying to use this plugin: http://www.marghoobsuleman.com/jquery-image-dropdown I cannot get it to work in my file. I copied and pasted the code from the example files and made the necessary links to the js and css files just to test, and i still cant get it to work. Everytime i run it, i get this error: Error: Result of expression '$(".mydds").msDropDown' [undefined] is not a function The script im using to run the file is: <script language="javascript" type="text/javascript"> function showvalue(arg) { alert(arg); //arg.visible(false); } $(document).ready(function() { try { oHandler = $(".mydds").msDropDown().data("dd"); oHandler.visible(true); //alert($.msDropDown.version); //$.msDropDown.create("body select"); $("#ver").html($.msDropDown.version); } catch(e) { alert("Error: "+e.message); } }) </script> Why am I getting these errors and how can I fix it?

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• How do you set up your JScript (NOT JScript.NET) development environment?

  - by jJack

  In my environment, if I create a class in JScript syntax: class test{ } and then save it to a file named "test.js" and run it with wscript, I get a Microsoft JScript "Syntax error" at line 1. However, if I simply, say, write a function: function getInput() { var wshell = WScript.CreateObject("WScript.Shell"); wshell.Popup ("Do you want to continue?"); return userInput } getInput() and run it the same way, it works. Hopefully, there is something fundamentally wrong with my class definition. If that is the case, I am excited to find out.

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• Unable to update value of Select from AngularJs

  - by Ahmad.Masood

  I am unable to update value of select from AngularJs. Here is my code <select ng-model="family.grade" > <option ng-repeat="option in options" value='{{option.id}}'>{{option.text}}</option> </select> Here are the options which i am using to populate my select var options = [{text:'Pre-K',id:'Pre-K'}, {text:'K',id:'K'}, {text:'1',id:'1'}, {text:'2',id:'2'}, {text:'3',id:'3'}, {text:'4',id:'4'}, {text:'5',id:'5'}, {text:'6',id:'6'}, {text:'7',id:'7'}, {text:'8',id:'8'}, {text:'+',id:'+'}]; Here is mu js code. $scope.$watch("family_member.date_of_birth" ,function(newValue, oldValue){ $scope.family.grade = "1" }) When ever value of family_member.date_of_birth changes it should set they value of select to 1. But this change is not visible on UI.

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• jQuery: Animated header plugin

  - by Fverswijver

  I'm looking for a jQuery plugin that can help me with the following: I have a list of images I want to use for my header but they are pretty big (height especially) and I don't want to resize them to fit my small header div. What I'd want is a plugin that allows the images to start at the bottom of the div (or rather the top of the image at the top of the div) and move upwards so the entire image can be seen, and once up they are shown entirely (bottom of image at bottom of div) they should "blend" (opacity toggle or something alike) with the next image and thus create a continuous loop with all the images. I've looked through several plugins but have never found one that can achieve what I'm looking for (maybe I'm asking for a tad too much) but my JS is not sufficient enough to build it myself. Thanks!

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• What does this JavaScript error mean?

  - by Tommy

  Using the “Venkman” JavaScript debugger for Mozilla and getting the following error: XML Parsing Error: not well-formed Location: x-jsd:source?location=http%3A%2F%2F192.168.1.150%2Fscript.js&instance=337 Line Number 557, Column 50:<line><margin x='t'> - </margin><num> 554</num> ?? valid = false;</line> Functions works but I don't understand the error. Any help is appreciated. Thanks. function ValidateCheckBoxes() { var valid; $(document).ready(function(){ if($('input[@name=boxesA]:checked').size() == 0) {     valid = false; } else { valid = true; } }); return valid; }

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• Problem with referencing CSS and Javascript fiels relativ

  - by Markus

  I have an IIS web site. This web site contains other web sites so the structure is like that. \ MainWebSite\ App1\ App2\ All sites are Asp.net MVC Webapplications. In the MasterPage of App1 i reference the Script-files like that <script type="text/javascript" src="../../Scripts/jquery-ui-1.8.custom.min.js"></script> The Problem is that he now tries to find the File at http:\server\MainWebSite\Scripts.... how can i workaround that? should i put all my Scripts and CSS files into the root directory is that a preferred solution?

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• jQuery add border to table.

  - by Kyle Sevenoaks

  Hi, I'm a jQuery noob, I tried this: <input value="1" type="checkbox" name="mytable" id="checkbox2" style="float:left;" /> {literal} <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> $(function() { //checkbox $(".mytable").click(function(){ $(".mytable").toggleClass('mytableborders'); }); }); </script> {/literal} <table class="mytable" id="cart">....</table> But it doesn't work, I want the checkbox to change the class of the table from .mytable to .mytableborders. Thanks :)

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• Ruby on Rails - Send JavaScript to view

  - by Eef

  Hey, I am creating a website in Ruby on Rails. I have a controller action that renders a view like so: def show time_left = Time.now.to_i - 3.hours.to_i @character = current_user.characters.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @character } end end This is fine as it renders the show.html.erb as I like. I would like however to somehow pass time_left to the view as a Javascript variable as this value is use by a countdown JQuery plugin. I could put a javascript block on the page in the HTML and print a instance variable out like so: <script type="javascript"> $('#countdown').countdown('<%= @time_left =>')</script> But I would like to keep all my JS in a external file and off the page could anyone give some advice on how to implement this? Cheers Eef

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• Should we bother about IE < 8?

  - by Misiur

  Hi there. It might look like philosophical question, however it really bother me. We're expecting HTML 5, we're using JS, Ajax, Flex, all this stuff, but when older browsers were devleoped, nooone even dreamed about such technologies. IE6 can't see transparency in PNG's. Some correct W3C techniques, are bad interpreted by IE6. It's just too old for our "new" world. IE7 is sight better better than IE6, but it still has some weird errors. How many people use IE6 now? And if someone upgraded to IE7, doesn't he already upgraded to IE8? Should we bother about those browsers? (sorry for bad eng, but noone in my country answered me to this)

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• PHP controllable menubar position

  - by craide

  I'm an admin for a page and I want to give certain users dynamic control of the menubar layout. The ideal would be a page with a list with menu items and arrows pointing up and down with each item and when you click them the item is reordered. I have a pretty basic idea of how I can do it but I would like some suggestions. The items are stored in MySQL and I only need help figuring out how the items should be ordered or numbered and how to re-order them. This probably needs some javascript trickery and I'm not familiar with JS.

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