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Basic form lookup renedered as drop down, hide fields based on lookup rendered as drop down value

I have tried the following to get the lookup rendered as a drop down to hide other fields based on its value

Here is another set of code I tried also unsuccessful

//# field with the conditional logic
$(document).ready(function () {
$("#inspectselectionid").change(onDisplaySectionChange);
onDisplaySectionChange();
});

function onDisplaySectionChange() {
var varSubject = $('#inspectselectionid').find("setIsDirty(this.id)").text();

// if lookup rendered as dropdown is Parking show justification field else hide
if (varSubject === "Parking") {

$('#logicalfieldtoshow').parent().parent().show();
}
else {
$('#logicalfieldtohide').parent().parent().hide();
}}

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General topics

The second set of code is closer to what you need as Power Pages does not support the model driven app client side scripting (e.g. formContext) - Use plain JQuery/JavaScript.

With the second bit of script put in a debugger statement and debug it in the browser - not sure if this line

$('#inspectselectionid').find("setIsDirty(this.id)").text(); is correct the others look ok

also in JQuery .change() is deprecated and should now be .on('change', yourfunction)

https://api.jquery.com/change-shorthand/

Edit: to get the text value from the dropdown you will need to do something like

$('#fieldschmaname').find("[value='"+ $('#fieldschmaname').val() +"']").text();

//and you will want to check $('#fieldschmaname').val() is not null or empty before that

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