How to Return a Popup Menu Value to a Text Field in Acrobat JavaScript
Question details
The user needs to populate a specific text field named "M-MainCaseMaterial" with the value selected from a multilevel popup menu using Acrobat JavaScript.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Developing a custom PDF form that uses JavaScript to capture multilevel popup menu selections and automatically display them in a designated text field.
- Observed behavior
- The developer needs the correct JavaScript syntax to assign the chosen popup menu value to a text field and properly handle scenarios where the user cancels the menu.
Ensure your PDF document has a text field exactly named "M-MainCaseMaterial" and that you have access to the JavaScript editor in your PDF application. Remember that JavaScript variables and field names are case-sensitive.
Assign the Popup Value and Clear on Cancel
Use this method to assign the selection and automatically clear the text field if the user presses Escape to close the menu.
When a user interacts with a popup menu but presses Escape without making a selection, the JavaScript returns a null value. By using the logical OR operator, you can instruct the script to output an empty string instead of printing the word 'null' into your text field.
Open your PDF form in editing mode, right-click the button that triggers the popup menu, and select 'Properties'.
Navigate to the 'Actions' tab, choose 'Mouse Up' as the trigger, select 'Run a JavaScript' from the action dropdown, and click 'Add'.
In the JavaScript editor, define your popup menu and append the assignment code: getField("M-MainCaseMaterial").value = cRtn || "";
Preserve the Existing Text Field Value if Cancelled
Use this approach if you want to keep the previously entered text in the field when the user opens the menu but makes no new selection.
Troubleshooting Field References
If the value isn't updating, check for script errors related to case sensitivity and invalid field references.
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Frequently Asked Questions
Why does my text field display 'null' when I cancel the popup menu?
If you assign the popup menu return value directly without validating it, pressing Escape returns a null object. Using the syntax `cRtn || ""` prevents this by assigning a blank string instead of the word 'null'.
Why is getField returning an error in my Acrobat JavaScript?
This usually happens if the field name is misspelled or the field does not exist in the current document. Ensure the string inside `getField("FieldName")` matches your actual text field's properties exactly.
Are Acrobat JavaScript variables case-sensitive?
Yes, JavaScript is strictly case-sensitive. Variables like `cChoices` and `CChoices` are treated as entirely different entities, which can cause your script to fail if not typed consistently.
Can I populate multiple text fields from a single popup menu selection?
Yes, you can evaluate the selected value and write a switch statement or use multiple `getField` commands to update different text fields based on the single `cRtn` result.
