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How to force Cascading Dropdown box to refresh


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I'm having trouble getting a cascading dropdown to refresh programatically :

I have two fields: Field1 (dropdown) and Field2(cascading dropdown), when the page loads I can using javascript set the value of Field1, but the corresponding Field2 does not recalculate.   its always stuck filtering off the first item in the Field1  dropdown.   

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I resolved a way to trigger an onchange event on Field1 programmatically.  Once the onchange event is triggered the cascading dropdown refreshes properly.

var e = document.querySelector("[id*=cbParamVirtual40]");
e.dispatchEvent(new Event('change'));

 

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