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Validate phone number

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Hi, You may use the following script:


function tel()
var message = document.getElementById("InsertRecordPhone").value; 

document.getElementById("InsertRecordPhone").value = (message.replace(/[^\d]/g, '')); 

var message1 = document.getElementById("InsertRecordPhone").value;
var tel =message1.substring(0,3);
if (tel!='031'){
alert("Please enter phone number which starts from 031");
return false;




This function will prevent form from submitting if  phone starts from other numbers. Don't forget to enter your field name instead of mine.

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On 1/21/2023 at 2:15 AM, PotatoMato said:

I am working with the code in the article Potato mentioned.  The problem I found was when using it on an update it wipes out the number that was stored in the database.  Looking for a solution to that now.

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