Global.isFinite() : isFinite « Global « JavaScript Tutorial






The isFinite() method is used to determine if a variable has finite bounds.

<html>
    <body>
    <script lanuguage="JavaScript">
    <!--
    function checkNum(){
        var n = document.form1.text1.value;
        if(isFinite(n) == true){
           alert("Your entry had finite bounds");
        }else{
           alert("Your entry had no finite bounds");
        }
    }
    -->

    </script>
    <form name="form1">
    Enter a number or character into the text box and then click the check value
    button to verify if the input is a number.
    <br><br>
    <input type="text" name="text1" size=3>
    <br><br>
    <input type="button" value="Check value" onClick='checkNum()'>
    <br>
    </form>
    </body>
    </html>








8.7.isFinite
8.7.1.Global.isFinite()