form validation in javascript vs html5

form validation in javascript vs html5

By : Marhula Broskynova
Date : November 17 2020, 04:28 AM
this will help HTML5 validation is convenient but it depends on your audience. HTML5 validations are not supported by some older browsers (here is the list: http://caniuse.com/#feat=form-validation). Also I've noticed a Safari bug: the form doesn't validate (expected behavior) but the pop up error message doesn't display leaving the user unsure of the issue.
code :

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html5 form validation, void form action and execute jQuery when all html5 form elements are validated?

html5 form validation, void form action and execute jQuery when all html5 form elements are validated?

By : user2964691
Date : March 29 2020, 07:55 AM
I hope this helps . According to this: Do any browsers yet support HTML5's checkValidity() method?, and this may not be the latest truth since HTML5 is a work in progress, the Form.checkValidity() and element.validity.valid should let you access validation information from JavaScript. Assuming that's true, your jQuery would need to attach itself to the form submit and make use of that:
code :
    // cancels the form submission

    // do whatever you want here
What javascript fallback does best simulate html5 form validation

What javascript fallback does best simulate html5 form validation

By : Hafiz
Date : March 29 2020, 07:55 AM
With these it helps CSS tricks has a nice article on the fallback process here: http://css-tricks.com/progressively-enhancing-html5-forms/
They also suggest a project such as this http://code.google.com/p/webforms2/
Javascript Form Validation within HTML5

Javascript Form Validation within HTML5

By : ggBuTTers
Date : March 29 2020, 07:55 AM
seems to work fine Move the ids to class. Then use getElementsByClassName and iterate through each.
code :
<input type="text" id="numbers" name="uadnumber" />
<input type="text" class="numbers" id="numbers1" name="uadnumber" />
return true;
var nbrs = document.getElementsByClassName('numbers');
for (var i = 0; i < nbrs.length; i++)
alert("Fields within this form must only use numbers, and not left empty");
return false;
return true;
Javascript Code For HTML5 Form Validation Not Working

Javascript Code For HTML5 Form Validation Not Working

By : fitka
Date : March 29 2020, 07:55 AM
wish of those help Like Ethan Brown said, you might missing attributeSupported function. If this is the case, you can add it to your code. It will check if attribute (in your case it's "required") is supported
code :
function attributeSupported(attribute) {
    return (attribute in document.createElement("input"));
function isSafariOnly() {
    return navigator.userAgent.indexOf('Safari') != -1 && navigator.userAgent.indexOf('Chrome') == -1;
$(function () {
    $('#contactForm').submit(function () {
        if (!attributeSupported("required") || isSafariOnly()) {
            $("#contactForm [required]").each(function (index) {
                if (!$(this).val()) {
                    alert("Please Fill In All Required Fields.");
                    return false;
        return true;
Also do I need this in my <head> tag:
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js">
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
if (isSafariOnly()) {
    $("#contactForm [required]").each(function (index) {
        if (!$(this).val()) {
            alert("Please Fill In All Required Fields.");
            return false;
HTML5 form validation without Javascript validation

HTML5 form validation without Javascript validation

By : Jeroen
Date : March 29 2020, 07:55 AM
will help you When you apply an HTML validation via HTML to a form element and that element's value doesn't meet the validation criteria, the form will NOT be submitted.
But, if you get JavaScript involved, you will have to take control of this process. The simplest way is to simply check the form's validity.
code :
var btn = document.getElementById("btnSubmit");
var frm = document.getElementById("frmTest");

btn.addEventListener("click", function(){
  // The HTML 5 Forms API provides a .checkValidity()
  // method to your form object so that you can know
  // if the form is valid or not:
<form method=post action="http://www.somewhere.com" id=frmTest>
  <input required>
  <input type=button id=btnSubmit value=submit>
  // Custom form validation logic:
  function validate(evt) {

    // An HTML5 form has a checkValidity() method which forces it
    // to examine the validity of all controls that know how to validate
    // and it returns a boolean indicating if ALL these controls are valid
    // or if any ONE of them is not.
    var valid = theForm.checkValidity();
    if (valid) {
      // Everything is good. Submit the form:
    } else {
      // At least one form element is invalid. Loop through all the elements to
      // see which one(s) they are:
      var theElements = theForm.elements;

      for (var i = 0; i < theElements.length; i++) {
        var theElement = theElements[i];

        // If the form element participates in the HTML5 Validity Framework and
        // if it is invalid...
        if (theElement.willValidate && !theElement.validity.valid) {

          console.warn(theElement.id + " validity details: ");

          // ...The object will have a validity object property:

          // The element is invalid. Loop through all the validity object's
          // properties to see why it is invalid:
          for (var constraint in theElement.validity) {

            // Check the particular validity constraint for true
            if (theElement.validity[constraint]) {
              // Update the span element next to the offending form element with the reason:
              theElement.nextElementSibling.innerHTML = constraint;
            }  // End If

          }  // End For

        }  // End If

      } // End For

    } // End If

  }  // End Function
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