bd/htmlform1.html at master · zhangsgithub04/bd · GitHub

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<HTML>
<HEAD>
<TITLE>Test Input Validation</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function testResults (form) {
    TestVar = isNumberString (form.inputbox.value)
    if (TestVar == 1)
        alert ("Congratulations! You entered only numbers");
    else
        alert ("Boo! You entered a string with non-numbers characters");
}
function isNumberString (InString)  {
    if(InString.length==0) return (false);
    var RefString="1234567890";
    for (Count=0; Count < InString.length; Count++)  {
        TempChar= InString.substring (Count, Count+1);
        if (RefString.indexOf (TempChar, 0)==-1)
            return (false);
    }
    return (true);
}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="myform">
Enter a string with numbers only:
<INPUT TYPE="text" NAME="inputbox" VALUE="">
<INPUT TYPE="button" NAME="button" Value="Click" onClick="testResults(this.form)" >
</FORM>
</BODY>
</HTML>