FAQ: I want to perform my own input validation and display a message based on the results
## Answer
Please use "「Script」".
---
## Overview
If you want to perform your input validation in "「Script」", please implement your input validation and result message display process in [$p.events.before_validate](/en/manual/script-events-before-validate) of the event firing script.
## Operation Procedure
1. Please enable the Number A item from the Editor tab.
1. Create a new "「Script」", write the script's contents below, and check "Edit" for the output destination to update.
1. Create a new record, enter a blank or a value other than 100 in Number A on the editing screen, and press the "Update" button.
### Execution Result
## Sample Code
##### JavaScript
```
$p.events.before_validate_Update = function (args) {
var myNumA = $p.getControl('NumA').val()
if (myNumA == "") {
$p.clearMessage();
$p.setMessage('#Message', JSON.stringify({
Css: 'alert-warning',
Text: 'No value entered. Please enter a number.'
}));
return false; //If false, processing stops and no update occurs
} else if (myNumA != 100) {
$p.clearMessage();
$p.setMessage('#Message', JSON.stringify({
Css: 'alert-error',
Text: 'Please enter the number 100.'
}));
return false; //If false, processing stops and the value is not updated
} else {
return true; //If true, the value is updated
}
}
````
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