Databases
StackOverflow2013
Postsdbo
POweb workers behave differently in webkit than Firefox
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POweb workers behave differently in webkit than Firefox
    primarykey
    data
    text
    <p>I have a web application that works just fine in modern webkit-based browsers (<a href="http://montecarlo-tester.appspot.com" rel="nofollow">http://montecarlo-tester.appspot.com/</a>). Basically it uses a webworker to fetch data from a server, and then sends it back after performing some computations.</p> <p>It works just fine in Chrome/Safari (no errors in console), but when I try to use it in Firefox, it doesn't. I've deduced that somehow the variable 'iterations' is not set properly in Firefox. Unfortunately, Firefox lacks a debugger (for web workers), and javascript has functional scoping, so it's really hard to pinpoint where the problem is. I've posted the javascript code for my web worker, and I was wondering if anybody could point out where I went wrong:</p> <pre><code>importScripts('/static/js/mylibs/jquery.hive.pollen-mod.js'); $(function (data) { main(); //while(main()); close(); }); function main() { //make an ajax call to get a param var iterations//value will be set by server response var key//key of the datastore object var continueloop = true; p.ajax.post({ url:'/getdataurl', dataType: "json", success: function(responseText){ if (responseText === null) { var workermessage = { "log":"responseText is null. Either the server has issues or we have run out of stuff to compute." }; $.send(workermessage); continueloop = false; } iterations = responseText.iterationsjob; key = responseText.key; } }); if (continueloop === false) { return false; } //here is where I think the problems begin. In chrome/safari, iterations = 1000. //In Firefox however, iterations = null. As a result, everything after that does not work. var i,x,y,z; var count = 0; var pi; start = new Date(); for (i=0;i&lt;iterations;i++) { x = Math.random(); y = Math.random(); z = x*x+y*y; if(z&lt;=1.0){ count++; } }//end for loop pi = count/(iterations)*4.0; end = new Date(); result = { "estimated_pi":pi, "num_iter":iterations, "duration_ms":end.valueOf()-start.valueOf(), "key":key }; //send results to the server p.ajax.post({ url: "/resultshandler", dataType:'json', data: result, success: function() { //do nothing! } }); $.send(result); return true;//persists the loop } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USejang
    1. USejang
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. CO"Unfortunately, Firefox lacks a debugger" Have you tried [Firebug](http://getfirebug.com)?
      singulars
      1. POweb workers behave differently in webkit than Firefox
      1. USYi Jiang
    2. CODoes it make a difference to put a semicolon after your variable name before the comment for `var iterations` and `var key`?
      singulars
      1. POweb workers behave differently in webkit than Firefox
      1. USjfriend00
    3. COIs your `p.ajax.post` function doing asynchronous or synchronous ajax? If async, then `iterations` will only be set in your success handler, not where you're asking for it to be set because the ajax call hasn't completed yet so `iterations` isn't set yet. Call an async ajax call just starts the operation and then your javascript continues executing. It isn't completed until sometime later when the success handler runs.
      singulars
      1. POweb workers behave differently in webkit than Firefox
      1. USjfriend00
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload