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Javascript postMessage Syntax Error DOM Exception in Web Worker Code

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  Javascript postMessage Syntax Error DOM Exception in Web Worker Code dman777 <darin.hensley@gmail.com> - 2013-09-27 08:09 -0700
    Re: Javascript postMessage Syntax Error DOM Exception in Web Worker Code Martin Honnen <mahotrash@yahoo.de> - 2013-09-27 17:47 +0200
    Re: Javascript postMessage Syntax Error DOM Exception in Web Worker Code dman777 <darin.hensley@gmail.com> - 2013-09-27 08:52 -0700
      Re: Javascript postMessage Syntax Error DOM Exception in Web Worker Code Martin Honnen <mahotrash@yahoo.de> - 2013-09-27 18:57 +0200
    Re: Javascript postMessage Syntax Error DOM Exception in Web Worker Code dman777 <darin.hensley@gmail.com> - 2013-09-27 10:09 -0700
      Re: Javascript postMessage Syntax Error DOM Exception in Web Worker Code dman777 <darin.hensley@gmail.com> - 2013-09-27 10:57 -0700

#21442 — Javascript postMessage Syntax Error DOM Exception in Web Worker Code

I am using Javascript Web Workers. In the web worker, I have:

function makeRequestChat(id) {
    var jsonObj;
    var xml = new XMLHttpRequest();
    xml.open("POST", "/site/myapp/" + id, true);
    xml.onreadystatechange = function () {
        if (xml.readyState === 4 && xml.status === 200){
            var jsonObj = JSON.parse(xml.responseText, function (key,value) { parseChat(key, value, id); });
            var foo = chatQueues[id];
            foo.queue = id;
            var bar = JSON.stringify(foo);
            postMessage(bar);

        }
    }
    xml.send(null);
}
I am using copy for sending the json string. I get Uncaught Error: SyntaxError: DOM Exception 12 get.js:28 xml.onreadystatechange. This is specifically at  postMessage(bar). This is strange there is nothing DOM related in this web workers code. I really need to get rid of this error if anyone can please help!

Here is the json string being returned to main:
 "{"active":0,"unanswered":0,"available":3,"queue":"uk"}"

I am desperate to get rid of this error if anyone can please help. 

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#21443

dman777 wrote:
> I am using Javascript Web Workers. In the web worker, I have:
>
> function makeRequestChat(id) {
>      var jsonObj;
>      var xml = new XMLHttpRequest();
>      xml.open("POST", "/site/myapp/" + id, true);
>      xml.onreadystatechange = function () {
>          if (xml.readyState === 4 && xml.status === 200){
>              var jsonObj = JSON.parse(xml.responseText, function (key,value) { parseChat(key, value, id); });
>              var foo = chatQueues[id];
>              foo.queue = id;
>              var bar = JSON.stringify(foo);
>              postMessage(bar);
>
>          }
>      }
>      xml.send(null);
> }
> I am using copy for sending the json string. I get Uncaught Error: SyntaxError: DOM Exception 12 get.js:28 xml.onreadystatechange. This is specifically at  postMessage(bar). This is strange there is nothing DOM related in this web workers code. I really need to get rid of this error if anyone can please help!

Which browser gives that error message? Do you get an error in other 
browsers too?

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#21444

On Friday, September 27, 2013 10:09:24 AM UTC-5, dman777 wrote:
> I am using Javascript Web Workers. In the web worker, I have:
> 
> 
> 
> function makeRequestChat(id) {
> 
>     var jsonObj;
> 
>     var xml = new XMLHttpRequest();
> 
>     xml.open("POST", "/site/myapp/" + id, true);
> 
>     xml.onreadystatechange = function () {
> 
>         if (xml.readyState === 4 && xml.status === 200){
> 
>             var jsonObj = JSON.parse(xml.responseText, function (key,value) { parseChat(key, value, id); });
> 
>             var foo = chatQueues[id];
> 
>             foo.queue = id;
> 
>             var bar = JSON.stringify(foo);
> 
>             postMessage(bar);
> 
> 
> 
>         }
> 
>     }
> 
>     xml.send(null);
> 
> }
> 
> I am using copy for sending the json string. I get Uncaught Error: SyntaxError: DOM Exception 12 get.js:28 xml.onreadystatechange. This is specifically at  postMessage(bar). This is strange there is nothing DOM related in this web workers code. I really need to get rid of this error if anyone can please help!
> 
> 
> 
> Here is the json string being returned to main:
> 
>  "{"active":0,"unanswered":0,"available":3,"queue":"uk"}"
> 
> 
> 
> I am desperate to get rid of this error if anyone can please help.

Hello,

Thank you for your reply. I get this in chromium Version 28.0.1500.71 (209842). When I try this in firefox, I do not get this error. But I do get this instead:

"Timestamp: 09/27/2013 10:49:16 AM
Error: NS_ERROR_XPC_NOT_ENOUGH_ARGS: Not enough arguments [nsIDOMWindow.postMessage]
Source File: http://10.14.213.69/js/get.js
Line: 28"

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#21445

dman777 wrote:

> Thank you for your reply. I get this in chromium Version 28.0.1500.71 (209842). When I try this in firefox, I do not get this error. But I do get this instead:
>
> "Timestamp: 09/27/2013 10:49:16 AM
> Error: NS_ERROR_XPC_NOT_ENOUGH_ARGS: Not enough arguments [nsIDOMWindow.postMessage]
> Source File: http://10.14.213.69/js/get.js
> Line: 28"

That error suggests the `postMessage` you are calling is not a 
WebWorker's postMessage but a DOM window's postMessage.

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#21446

On Friday, September 27, 2013 10:09:24 AM UTC-5, dman777 wrote:
> I am using Javascript Web Workers. In the web worker, I have:
> 
> 
> 
> function makeRequestChat(id) {
> 
>     var jsonObj;
> 
>     var xml = new XMLHttpRequest();
> 
>     xml.open("POST", "/site/myapp/" + id, true);
> 
>     xml.onreadystatechange = function () {
> 
>         if (xml.readyState === 4 && xml.status === 200){
> 
>             var jsonObj = JSON.parse(xml.responseText, function (key,value) { parseChat(key, value, id); });
> 
>             var foo = chatQueues[id];
> 
>             foo.queue = id;
> 
>             var bar = JSON.stringify(foo);
> 
>             postMessage(bar);
> 
> 
> 
>         }
> 
>     }
> 
>     xml.send(null);
> 
> }
> 
> I am using copy for sending the json string. I get Uncaught Error: SyntaxError: DOM Exception 12 get.js:28 xml.onreadystatechange. This is specifically at  postMessage(bar). This is strange there is nothing DOM related in this web workers code. I really need to get rid of this error if anyone can please help!
> 
> 
> 
> Here is the json string being returned to main:
> 
>  "{"active":0,"unanswered":0,"available":3,"queue":"uk"}"
> 
> 
> 
> I am desperate to get rid of this error if anyone can please help.

Wow, interesting. Here is my main:

var worker1 = new Worker("js/get.js");

worker1.addEventListener("message", tell, false);

worker1.postMessage();


function tell(event) {
    var foo = JSON.parse(event.data);
    chatQelements(foo);
}


function chatQelements(foo) {
    var bar = document.getElementById("active" + foo["queue"]);
    bar.textContent = "Active: " + foo["active"];
    bar = document.getElementById("unans" + foo["queue"]);
    bar.textContent = "Unanswered: " + foo["unanswered"];
    bar = document.getElementById("avail" + foo["queue"]);
    bar.textContent = "Available: " + foo["available"];
}


How do I direct the workers postMessage(bar) to send the message to worker1.addEventListener("message", tell, false);?

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#21447

On Friday, September 27, 2013 12:09:15 PM UTC-5, dman777 wrote:
> On Friday, September 27, 2013 10:09:24 AM UTC-5, dman777 wrote:
> 
> > I am using Javascript Web Workers. In the web worker, I have:
> 
> > 
> 
> > 
> 
> > 
> 
> > function makeRequestChat(id) {
> 
> > 
> 
> >     var jsonObj;
> 
> > 
> 
> >     var xml = new XMLHttpRequest();
> 
> > 
> 
> >     xml.open("POST", "/site/myapp/" + id, true);
> 
> > 
> 
> >     xml.onreadystatechange = function () {
> 
> > 
> 
> >         if (xml.readyState === 4 && xml.status === 200){
> 
> > 
> 
> >             var jsonObj = JSON.parse(xml.responseText, function (key,value) { parseChat(key, value, id); });
> 
> > 
> 
> >             var foo = chatQueues[id];
> 
> > 
> 
> >             foo.queue = id;
> 
> > 
> 
> >             var bar = JSON.stringify(foo);
> 
> > 
> 
> >             postMessage(bar);
> 
> > 
> 
> > 
> 
> > 
> 
> >         }
> 
> > 
> 
> >     }
> 
> > 
> 
> >     xml.send(null);
> 
> > 
> 
> > }
> 
> > 
> 
> > I am using copy for sending the json string. I get Uncaught Error: SyntaxError: DOM Exception 12 get.js:28 xml.onreadystatechange. This is specifically at  postMessage(bar). This is strange there is nothing DOM related in this web workers code. I really need to get rid of this error if anyone can please help!
> 
> > 
> 
> > 
> 
> > 
> 
> > Here is the json string being returned to main:
> 
> > 
> 
> >  "{"active":0,"unanswered":0,"available":3,"queue":"uk"}"
> 
> > 
> 
> > 
> 
> > 
> 
> > I am desperate to get rid of this error if anyone can please help.
> 
> 
> 
> Wow, interesting. Here is my main:
> 
> 
> 
> var worker1 = new Worker("js/get.js");
> 
> 
> 
> worker1.addEventListener("message", tell, false);
> 
> 
> 
> worker1.postMessage();
> 
> 
> 
> 
> 
> function tell(event) {
> 
>     var foo = JSON.parse(event.data);
> 
>     chatQelements(foo);
> 
> }
> 
> 
> 
> 
> 
> function chatQelements(foo) {
> 
>     var bar = document.getElementById("active" + foo["queue"]);
> 
>     bar.textContent = "Active: " + foo["active"];
> 
>     bar = document.getElementById("unans" + foo["queue"]);
> 
>     bar.textContent = "Unanswered: " + foo["unanswered"];
> 
>     bar = document.getElementById("avail" + foo["queue"]);
> 
>     bar.textContent = "Available: " + foo["available"];
> 
> }
> 
> 
> 
> 
> 
> How do I direct the workers postMessage(bar) to send the message to worker1.addEventListener("message", tell, false);?

Actually, the question is how do I keep it from going to the DOM window? I have verified that it goes to the worker1 object because the script works with the output I intended with the info from the message. I also verified in debugger that event.target = Worker. So I am not sure why the DOM Window is also accepting it and treating it like it goes to itself.

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