How to Show Hidden Text in a PDF Form Field on Hover
Question details
The user needs to display overflowing text in a multiline PDF form field using a pop-up tooltip when the mouse hovers over the field.
- Product
- PDF Editor
- Device & OS
- not provided
- Scenario
- Designing or filling out a PDF form where the multiline text exceeds the fixed field height, requiring a way to view the full response without scrolling.
- Observed behavior
- Excess text becomes hidden within the fixed-size form field, and the user wants to dynamically reveal the complete entered value via a hover tooltip.
Ensure you are using a PDF editor that supports form field editing and JavaScript execution, such as Adobe Acrobat Pro. Check that your PDF document permissions allow for editing and script validation.
Use a Custom JavaScript Validation Script
Add a simple JavaScript line to the form field's validation settings to automatically copy the entered text into the field's tooltip property.
This method leverages PDF JavaScript to dynamically update the field's tooltip (known internally as the 'userName' property) whenever the user types something new and validation occurs.
Open your PDF in form preparation or editing mode. Right-click the multiline text field where text is being cut off and select 'Properties'.
In the Text Field Properties dialog box, click on the 'Validate' tab located at the top.
Select the 'Run custom validation script' option and click the 'Edit' button. In the JavaScript Editor, enter exactly: event.target.userName = event.value; then click 'OK'.
Close the properties window and exit form editing mode. Type excess text into the field, click outside the box to trigger validation, and then hover your cursor over the field to see the complete text pop up in the tooltip.
Easily Manage and Fill PDF Forms with WPS Office
WPS Office provides a powerful, lightweight PDF toolkit that allows you to easily read, fill, and manage interactive PDF forms without the hassle of missing text or complex scripting.
- 1. Open Your PDF: Launch WPS Office and open your interactive PDF form.
- 2. Fill in the Fields: Click on the form fields to enter your data. WPS PDF automatically supports standard form field scrolling and reading properties.
- 3. Save or Export: Once your form is filled, click 'Save' or export the document to share it securely.
Frequently Asked Questions
Why is the text in my PDF form field getting cut off?
This happens when the form field is set to a fixed font size and does not have the 'Scroll long text' option enabled. Consequently, any text that exceeds the physical box dimensions becomes hidden from view.
Will this JavaScript tooltip method work in all PDF viewers?
Not necessarily. The script requires a PDF viewer that natively supports JavaScript execution, such as Adobe Acrobat or full-featured desktop PDF editors. Many basic browser-based PDF viewers will not execute the script, meaning the dynamic tooltip won't trigger.
Can I make the text auto-resize instead of using a hover tooltip?
Yes. If you open the Text Field Properties and go to the 'Appearance' tab, you can set the Font Size to 'Auto'. This will shrink the text to fit within the box dimensions instead of hiding it, although it may become difficult to read if a large amount of text is entered.
