CODEWITHSUNDEEP
javascripthtmlconstraint-validation-api
edddd
edddd

Reputation: 482

Can you call checkValidity() on a <form> element?

I was looking through the Constraint Validation API and found some example code online that seemed to call checkValidity() on <form> elements:

(function() {
'use strict';
window.addEventListener('load', function() {
  var forms = document.getElementsByClassName('needs-validation');
  var validation = Array.prototype.filter.call(forms, function(form) {
    form.addEventListener('submit', function(event) {
      if (form.checkValidity() === false) {
        event.preventDefault();
        event.stopPropagation();
      }
      form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();

But I tried to do this myself and it didn't work. I couldn't find any reference to this being possible anywhere else either. As far as I figured, it can't be called on <form>. Could someone help me out?

Upvotes: 2

Views: 2494

Answers (2)

Gaurav Khanzode
Gaurav Khanzode

Reputation: 13

Actually there are many ways to dot this. It seems like you have written a self-invoking JS function. In the other simple way, you can simply write a onsubmit event attribute in tag and write the function name.

e.g.

<form onsubmit="return checkValidity()">
        //...rest stuff
</form>

Based on the returned result from the function, whether true or false depending on the conditions the form will get submitted or stop submission respectively.

Upvotes: 0

brk
brk

Reputation: 50346

You are using submit , but if you are using input there is no submit event for it. You can use input or paste event handler for input

window.addEventListener('load', function() {
  var forms = document.getElementsByClassName('needs-validation');
  var validation = Array.prototype.filter.call(forms, function(form) {
    form.addEventListener('input', function(event) {
      if (form.checkValidity() === false) {
        event.preventDefault();
        event.stopPropagation();
      }
      form.classList.add('was-validated');
    }, false);
  });
}, false);
<form>
  <input type='email' class='needs-validation'>
  <button type='submit'>Submit</button>
</form>

Upvotes: 2

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