Javascript-Reference-Code/mobval.html at master · kugesh-Rajasekaran/Javascript-Reference-Code · GitHub

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<html>
    <head>
        <script type="text/javascript">

        function fun(){
var a=document.getElementById("first").value;
var exp=/^[7-9]\d{9}$/;
if(exp.test(a)){
    document.getElementById("lab").innerHTML="valid";

    document.getElementById("lab").style.visibility="visible";
    document.getElementById("lab").style.color="green";

}
else{
    document.getElementById("lab").innerHTML="invalid";

    document.getElementById("lab").style.visibility="visible";
    document.getElementById("lab").style.color="red";


}


        }

        </script>
    </head>

    <body>

<form>
    <input id="first" placeholder="enter_mob_no">
    <label id="lab" style="color: red;visibility:hidden" >Invalid</label>
    <button onclick="fun()"  type="button">click me</submit>
</form>


    </body>
</html>