Delay HTML5 :Invalid Pseudo-Class Until the First Event

Delay HTML5 :invalid pseudo-class until the first event

http://www.alistapart.com/articles/forward-thinking-form-validation/

Since we only want to denote that a field is invalid once it has
focus, we use the focus pseudo-class to trigger the invalid styling.
(Naturally, flagging all required fields as invalid from the start
would be a poor design choice.)

Following this logic, your code would look something like this...

<style>
    input:focus:required:invalid {background-color: pink; color: white;}
    input:required:valid {background-color: white; color: black; }
</style>

Created a fiddle here: http://jsfiddle.net/tbERP/

As you'd guess, and as you'll see from the fiddle, this technique only shows the validation styling when the element has focus. As soon as you move focus off, the styling is dropped, regardless of whether it is valid or not. Not ideal by any means.

Validation in HTML5. :invalid classe after submit

No there is nothing out of the box.

Mozilla has its own pseudoclass for something very similiar called ':-moz-ui-invalid'. If you want to achieve something like this, you have to use the constraint validation DOM-API:

if(document.addEventListener){
    document.addEventListener('invalid', function(e){
        e.target.className += ' invalid';
    }, true);
}

You can also use webshims lib polyfill, which will not only polyfill incapable browsers, but also adds something similiar like -moz-ui-invalid to all browser (.form-ui-invalid).

How to make pseudo class :invalid apply to an input AFTER submitting a form

You can add a class to the form when the submit-button was clicked and adjust your CSS selector so it only matches the input fields in a submitted form:

document.getElementById("submitButton").addEventListener("click", function(){

 document.getElementById("testForm").className="submitted";

});

form.submitted input:invalid{

  border:1px solid red;

}

<form id="testForm">

<input type="text" required>

<input type="submit" value="submit" id="submitButton">

</form>

How to work input[type=text]:invalid with html 5 required?

Can you try below code? here It will have red border only when you focus input. However If you wish to display border when focus is lost after focusing once then you may need to write some javascript code instead of css.

input:focus:invalid {border: 1px red solid;}

Delay HTML5 :invalid pseudo-class until the first event

http://www.alistapart.com/articles/forward-thinking-form-validation/

Since we only want to denote that a field is invalid once it has
focus, we use the focus pseudo-class to trigger the invalid styling.
(Naturally, flagging all required fields as invalid from the start
would be a poor design choice.)

Following this logic, your code would look something like this...

<style>
    input:focus:required:invalid {background-color: pink; color: white;}
    input:required:valid {background-color: white; color: black; }
</style>

Created a fiddle here: http://jsfiddle.net/tbERP/

As you'd guess, and as you'll see from the fiddle, this technique only shows the validation styling when the element has focus. As soon as you move focus off, the styling is dropped, regardless of whether it is valid or not. Not ideal by any means.

How to have onclick() event as well as HTML5 form validation together?

This has nothing to do with the onclick event. It is caused by the alert.

You are pulling the focus away from the form which causes the browser generated error message to be removed at the instant it would normally be displayed.

Don't use alert(). Instead, modify the DOM of the page to display the message there.

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