CODEWITHSUNDEEP
dojo
Piyush-Ask Any Difference
Piyush-Ask Any Difference

Reputation: 4286

Avoiding onChange on ComboBox when chaning selection dynamically

I have a combobox for which I have a validation that a change in selection should be reverted back on meeting a condition.

I have detected the condition but when I change the value and displayedValue of combobox, the onChange associated with the combobox gets fired. Following is the code I am using to change the selection:

dijit.byId('scheduleName').set('value',val,false);
dijit.byId('scheduleName').set('displayedValue',displayVal,false);

I have also tried to set the onChange to blank before firing above code and then re attaching the onChange code as below:

dojo.connect(dijit.byId('scheduleName'),'onChange','');
dijit.byId('scheduleName').set('value',scheduleNameVal,false);
dijit.byId('scheduleName').set('displayedValue',trim(String(scheduleNameName)),false);
dojo.connect(dijit.byId('scheduleName'),'onChange', "hideGrid");

hideGrid is a javascript function. I am using Dojo 1.8

Upvotes: 0

Views: 1927

Answers (2)

phusick
phusick

Reputation: 7352

Set only value, not displayedValue

myComboBox.set("value", value, false);

then only watch callback is fired, not dojo/on or onChange.

Check this jsFiddle out to see differencies: http://jsfiddle.net/phusick/d7ymY/

Note: If you need to trim() displayedValue consider a custom setter or dojo/aspect::before.

Upvotes: 3

Craig Swing
Craig Swing

Reputation: 8162

You should use dojo.disconnect instead of 

dojo.connect(dijit.byId('scheduleName'),'onChange','');

Example:

var hndl, sched = dijit.byId('scheduleName');
var fnWireOnChange = function(){
  hndl = dojo.connect(sched,'onChange', 'hideGrid');
};

dojo.disconnect(hndl);
sched.set('value',scheduleNameVal,false);
sched.set('displayedValue',trim(String(scheduleNameName)),false);
fnWireOnChange();

As a side note, connect/disconnect has been deprecated in favor of dojo/on

https://dojotoolkit.org/reference-guide/1.8/dojo/on.html#dojo-on

Upvotes: 1

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