Unable to stop TaskMgr

Published by: cfz 2009-01-07

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I have some problems with ExtJS and tasks. First of all I was unable to start the timer with this.doUpdate as property for run. The other (much bigger) problem is that I'm unable to stop the timer, I see the message-box but the timer runs until I close the browser/tab.

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Ext.UpdateControl = Ext.extend(Ext.BoxComponent, {
updateTimer : null,
[...]
startUpdate : function() {
if ( !this.updateTimer ) {
this.updateTimer = Ext.TaskMgr.start({

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interval: 500,
//run: this.doUpdate,
run: function() {
this.imageEl.src = this.imageURL + '?' + new Date().getTime();
},
scope: this
});
}
},

doUpdate : function() {
this.imageEl.src = this.imageURL + '?' + new Date().getTime();
},

stopUpdate : function() {
alert('Stopping');
Ext.TaskMgr.stop(this.updateTimer);
}
});

Your code looks correct (event the this.doUpdate should work).

Are you calling startUpdate and stopUpdate with the correct scope?

Thanks, works like a charm now :D

Yes, it's a scope problem:
var window = new Ext.Window({
[...]
buttons: [{
text: 'Start',
handler: updateController.startUpdate,
scope: updateController
},{
text: 'Stop',
handler: updateController.stopUpdate,
scope: updateController
}]
});
(otherwise 'this' in startUpdate/stopUpdate will refer to the Start/Stop button instead of the updateController instance)

Never thought it was a scope problem, because starting the timer works fine (stopping doesn't of course). Here is the calling code:

var updateController = new Ext.UpdateControl({
id: 'update-control'
});

var window = new Ext.Window({
[...]
buttons: [{
text: 'Start',
handler: updateController.startUpdate
},{
text: 'Stop',
handler: updateController.stopUpdate
}]
});