Can someone tell me what does this part of code do? i have look through w3cschool and i dont understand.

Leon · October 24, 2015

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Untitled 1</title>

</head>

<body>

<form name="checkmail" onSubmit="return checkemail()" method="post"

action="javascript:alert('The form is submitted!!!')">

Please enter your email<br />

</form>

function checkemail(){

var email=document.checkmail.Text1.value;

if (email.indexOf(' ')==-1

&& 0 < email.indexOf('@')

&& email.indexOf('@')+5< email.length

)return true;

else alert('Invalid Email address')

return false;

}

</script>

</body>

</html>

if (email.indexOf(' ')==-1

&& 0 < email.indexOf('@')

&& email.indexOf('@')+5< email.length

)return true;

else alert('Invalid Email address')

return false;

}

Can someone tell me what does this part of code do? i have look through w3cschool and i dont understand.

Ash! · October 24, 2015

Hi,

Looks like it checks whether the text entered is a valid email address or not.

If you are confused by the indexOf part, check this: http://www.w3schools.com/jsref/jsref_indexof.asp

Edited October 24, 2015 by Ash!

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