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1

I have created a web worker using, but I could not find a way to get the instance of Worker from inside the Worker function.

From inside the function, if I use 'this' or 'self' then I only can get 'DedicatedWorkerGlobalScope' object.

Please see the code snippet below to understand the problem:

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

I have tried to pass the Worker instance in postMessage, such as:

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

Thanks in advance for the help~

javascript web-worker

share|improve this question

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you need it for?
  
  – charlietfl
  Mar 28 at 1:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have a need to set/add 'some states' into the 'Worker' object, so caller and other functions can see the state. For example: is it busy ? is it finished ? what is the current progress ?
  
  – hmaxf2
  Mar 28 at 8:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So why can't that be done using standard messages and some sort of state object?
  
  – charlietfl
  Mar 28 at 9:07
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The above snippet is only an example, the actual code is quite broad and the Worker states will be shared among different function, so I feel need the add some flags directly to the Worker object itself instead of making some global variables and doing many postMessage(), do you have any way to get the Worker object instance from inside the Worker itself ?
  
  – hmaxf2
  Mar 29 at 4:26
  

  
  
  
  

add a comment | 

1

I have created a web worker using, but I could not find a way to get the instance of Worker from inside the Worker function.

From inside the function, if I use 'this' or 'self' then I only can get 'DedicatedWorkerGlobalScope' object.

Please see the code snippet below to understand the problem:

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

I have tried to pass the Worker instance in postMessage, such as:

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

Thanks in advance for the help~

javascript web-worker

share|improve this question

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you need it for?
  
  – charlietfl
  Mar 28 at 1:59
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have a need to set/add 'some states' into the 'Worker' object, so caller and other functions can see the state. For example: is it busy ? is it finished ? what is the current progress ?
  
  – hmaxf2
  Mar 28 at 8:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So why can't that be done using standard messages and some sort of state object?
  
  – charlietfl
  Mar 28 at 9:07
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The above snippet is only an example, the actual code is quite broad and the Worker states will be shared among different function, so I feel need the add some flags directly to the Worker object itself instead of making some global variables and doing many postMessage(), do you have any way to get the Worker object instance from inside the Worker itself ?
  
  – hmaxf2
  Mar 29 at 4:26
  

  
  
  
  

add a comment | 

I have created a web worker using, but I could not find a way to get the instance of Worker from inside the Worker function.

From inside the function, if I use 'this' or 'self' then I only can get 'DedicatedWorkerGlobalScope' object.

Please see the code snippet below to understand the problem:

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

I have tried to pass the Worker instance in postMessage, such as:

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

Thanks in advance for the help~

javascript web-worker

share|improve this question

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

/******** below is main.html file *********/
var mywebworker1 = new Worker('mywebworker1.js');
 
// register event listener to receive data from worker
mywebworker1.addEventListener('message', function(e) 
 // at this point, 'this' == 'Worker' instance
 
 // ... other code
);


/******** below is inside mywebworker1.js file *********/
self.addEventListener('message', function(e) 
 // at this point, 'this' == 'DedicatedWorkerGlobalScope' object
 
 // PROBLEM: How to get 'Worker' instance in here ??
 
 // .. other code
, false);

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

// send command to start counting
mywebworker1.postMessage("action": "count", "from" : 7, "to": 22, "instance": mywebworker1);

// GOT ERROR message = Uncaught DOMException: Failed to execute 'postMessage' on 'Worker': Worker object could not be cloned.

share|improve this question

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

share|improve this question

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges

asked Mar 28 at 1:46

hmaxf2hmaxf2

38622 silver badges99 bronze badges