html - Javascript onchange validation so that :valid and :invalid CSS selectors work -

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this seems simple thing do, have not been able find this.

how can use following:

// html: <input type="text" onchange="validate()"> function validate(e) {     e.preventdefault();      if(isvalid(this.value)) {         // make valid somehow     } else {         // make invalid somehow     } }

so following css works might expect:

input:valid {     background: green; }  input:invalid {     background: red; }

click "run code snippet" see!

you can create custom validator , use setcustomvalidity function on element allow use of these selectors.

this article describes how use html5 constraint api achieve this.

example:

#inputfield:valid {    background-color: green;  }    #inputfield:invalid {    background-color: red;  }
<html>    <body>      type value (must 'abc'): <input id="inputfield">      <button>check it!</button>      <script type="text/javascript">        function validatefield() {          if (this.value !== 'abc') {            this.setcustomvalidity('value must abc!');          }          else {            this.setcustomvalidity('');          }        }        window.onload = function () {          document.getelementbyid("inputfield").onchange = validatefield;        }      </script>    </body>  </html>


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