Dropdown list selection question

Question

Hello, I have a dropdown list with values-- (first value)01 (second value)02 03 And a textfield. This text field will have a string - 01 for example.I want the user to not be able to select the value which is in the textfield, from the dropdown list. I've tried this code but it's not working as expected -I have to click multiple times there to work-- added it in the Mouse Down event for the dropdown list  if (this.getField("Dropdown").valueAsString==this.getField("Textfield").value)
{
app.alert("this value can't be selected",1);
this.getField("Dropdown").currentValueIndices=0;
}  Can you please give me an idea? Thank you.

Thom Parker · Answer

Add this script to the Custom Validation script on the dropdown

event.rc = event.value != this.getField("TextField").valueAsString;
if(!event.rc)
    app.alert("this value can't be selected",1);

The validation script is the correct place to "validate" a selection. The "event.rc" property determines whether or not the selected value is accepted. The "validation" event occurs before the selected value is actually committed, so the only way to access the current selection is though the event object.

You can read more about dropdown fields here:

https://www.pdfscripting.com/public/List-Field-Usage-and-Handling.cfm

And validation scripts here:

https://www.pdfscripting.com/public/Form-Data-Validation.cfm

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