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How to prevent field onchange event from getting fired in a loop.

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Posted on by Mohammed Fakhri

402

I am updating optionset value inside onchange function to the previous selection after showing an alert. which works fine but the function is again trigered due to this update. How can I prevent this.

Below id my code:

//registered on change of new_decision field

function onchange(){

var formContext = eContext.getFormContext();

alert("This is not a valid decision for application");

formContext.getAttribute("new_decision").setValue();

}

I have tried few things like atttaching onchange through addonchange method insted of Form UI.

I have also turned on legacy form rendering but it is firing in a loop.

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Mohammed Fakhri 402 on at

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RE: How to prevent field onchange event from getting fired in a loop.

Thanks Ankit and Henry.

Ankit, I liked your solution (havent tried though) but I used SetTimeOut function to my rescue. -

Use this to set value - window.setTimeout(function () { formContext.getAttribute("new_decision").setValue(); }, 300);

This wont trigger the OnChange again in a loop.
Henry J. 5,237 on at

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RE: How to prevent field onchange event from getting fired in a loop.

Hi Mohammed,

Please refer to this article on Attribute OnChange Event as well:
https://docs.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/events/attribute-onchange

Henry
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Ankit Sabharwal on at

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RE: How to prevent field onchange event from getting fired in a loop.

Hello Partner,

If this is one time execution, like after alert you set the right value and you don't want to fire the OnChange event, you can fiddle with the code as follows :-

var checkFlag = true;
function onchange(){

if(checkFlag)
{
var formContext = eContext.getFormContext();

alert("This is not a valid decision for application");

formContext.getAttribute("new_decision").setValue();
checkFlag= false;
}

}

Hope this helps.

Best regards,

Ankit

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