<!doctype html>
<meta charset= "UTF-8" >
<meta name= "Generator" content= "editplus®" >
<meta name= "Author" content= "" >
<meta name= "Keywords" content= "" >
<meta name= "Description" content= "" >
<title>javascript Note 2</title>
<script type= "Text/javascript" >
Validation: Method 1
function Email () {
var Email=document.getelementbyid ("email"). Value;
if (email== "" | | Email==null) {
Alert ("Email cannot be empty!") ");
}
return false;
}
Validation: Method 2
function validate_required (field,alerttxt) {
With (field) {
if (value==null| | value== "") {
alert (alerttxt);
return false;
}else {
return true;
}
}
}
function Validate_form (thisform) {
With (Thisform) {
if (validate_required email, "Email must be filled out!") ==false) {
Email.focus ();
return false;
}
}
}
</script>
<body>
<!--validation: Method 1-->
<form action= "#" Onsubmit=email () method= "POST" >
Email:<input type= "text" id= "email"/>
<input type= "Submit" value= "Submission"/>
</form>
<!--validation: Method 2-->
<form action= "main.html" onsubmit= "return Validate_form (This)" method= "POST" >
Email: <input type= "text" name= "email" size= ">"
<input type= "Submit" value= "Submit" >
</form>
</body>
2016-04-05 Java Learning Note-validation
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