Hello Jeremiah!
Do you solve this problem?
I have similar issue in Microsoft Dynamics CRM 2016.
Error message appears twice if I alert it on OnChange event and then set field value to null. It’s happen even I have first validated field to null.
I notice that field clearing occurs a second time. So, my workaround is alert message only a second time. To resolve it I add error
counter, that help to understand when really alert a message. I alert message only when counter is
odd number.
My solution:
In MyEntity.FormEvents.js add counter on OnLoad event.
function MyEntityOnLoad()
{
//Variable is needed to display Error Message only once.
var ERROR_COUNTER = 0;
}
Add function that call when need to show message and clean field.
function _showError(errorMsg, fieldName)
///<summary>Display error message</summary>
///<param name="errorMsg" type="String">Error message</param>
///<param name="fieldName" type="String">Entity field name that need to clear</param>
{
//Display error message only if counter is odd number.
if (ERROR_COUNTER != 0 && _isOdd(ERROR_COUNTER))
{
alert(errorMsg);
}
//Clear field value
Xrm.Page.getAttribute(fieldName).setValue(null);
ERROR_COUNTER++;
}
Add function that check is presented number odd or not.
function _isOdd(num)
{
///<summary>Validate is passed odd number or not.</summary>
///<param name="num" type="number">Number</param>
///<return>true or false</return>
return !!(num % 2);
}
It works for me.
JavaScript OnChange Functions being called twice (2 times) in Microsoft Dynamics CRM Online 2015 Update 1
