Making a field in UI page mandatory

[SamiranD]

I want to make a field mandatory in an UI Page and by using required tag it is not working. Any workaround? maybe some javascript code or any other thing?

[kirankawle]

function validateMandatoryField() {
var field = document.getElementById('mandatoryField');
if (!field.value.trim()) {
alert('This field is mandatory. Please fill it out.');
return false; // Prevent form submission
}
return true; // Allow form submission
}

lets try this code 

[SamiranD]

@kirankawle

I have to write this in client script section of the UI pAge?

[kirankawle]

yes can you please try it on client script section of the UI page.it should work .

[GopikaP]

Hi @SamiranD , you will need validation in client script to see if the field has value or not.

Can you share your HTML and Client Script? 

Please refer:

Solved: UI Page, Reference field mandatory not working - ServiceNow Community