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Text Field Formatting Validation

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This links might give you an idea on how it can be done by adding a required pattern attribute to your text fields.



Here's an example that you can test in an HTML Block w/ Header and Footer for the styles:

<div>FISCAL ID: <input type="text" name="name" required pattern="[A-Z]{6}\d{2}[A-E,H,L,M,P,R,S,T]{1}\d{2}[A-Z]{1}\d{3}[A-Z]{1}" /></div>

input:required:invalid {background-color: lightcoral;}
input:required:valid {background-color: lightgreen;} 

With this knowledge, you can select the Caspio text field and use:

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  • 3 years later...

Just to add, if you also wish to validate value entered in an input field to make sure that it follows this format: www.websitename.com

Then you can use this code:


<script type="text/javascript">

document.addEventListener('BeforeFormSubmit', function(event) {

var inputField = document.querySelector('#InsertRecordNameofField');

  const value = inputField.value;
  const regex = /^www\.[a-zA-Z0-9-]+\.[a-zA-Z]{2,}$/;

if (!regex.test(value)) {
alert('Invalid Submission!');

} else {




Make sure to replace "NameofField" with the actual name of the field that you want to validate before submitting.

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