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Add values into hidden form fields using JS

I am trying to insert a string into the form hidden field using JS and google tag manager.

This is the script/method (worked on a bunch of different forms)

(function(){

var selector1 = $('[id="label-utm_source-f7d353cc-c056-400e-a41a-2b022eaf4340_7665"]') 
$(selector1).val('{{Read UTM Medium cookie}}');

})();

</script>

or

var selector1 = $('input name="utm_original_lead_source"') 
$(selector1).val('{{Read cookie-UTM source}}');

And nothing worked. Any idea what I'm missing here ?

Thank you!

This is the form field:

7 months ago · Juan Pablo Isaza

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Answer 1 · 2022-07-01T02:38:21.179Z

A css selector is actually a string. So this cannot work:

var selector1 = $('[id="label-utm_source-f7d353cc-c056-400e-a41a-2b022eaf4340_7665"]') 
$(selector1).val('{{Read UTM Medium cookie}}');

it should be something like this:

var selector1 = '*[id="label-utm_source-f7d353cc-c056-400e-a41a-2b022eaf4340_7665"]';
$(selector1).val('{{Read UTM Medium cookie}}');

This is also wrong:

var selector1 = $('input name="utm_original_lead_source"') 
$(selector1).val('{{Read cookie-UTM source}}');

And should be like this:

var selector1 = 'input[name="utm_original_lead_source"]';
$(selector1).val('{{Read cookie-UTM source}}');