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  • Sep 25 2006
    12:06 PM
    28567
    112

    What is the difference between echo and print?
    • Ashwani

    If anyboyd knows, do tell me.waiting for your prompt response.

    Nakato

    • Aug 18th, 2017

    Echo() can be used as part of an expression, while print() cant

    Abinash Kumar

    • Jun 20th, 2017

    Echo does not returns a value and is faster than print. While print is a language construct that returns 1 which makes it slower in page than echo

  • Feb 01 2006
    11:43 AM
    6823
    13

    How to use email validation in Java script.Like User can't enter invalid email address?
    • mrbaliram

    Star Read Best Answer

    Editorial / Best Answer

    bicu  

    • Member Since Sep-2005 | Feb 2nd, 2006

    First of all, here is the javascript function that tests if an email address is valid.
    It checks for a lot of things: to see if the email contains a "@" sign and a dot, checks to see if the @ is before the dot, and so on.

    <script>
    function isMail(str)
    {
       var at="@";
       var dot=".";
       var lat=str.indexOf(at);
       var lstr=str.length;
       var ldot=str.indexOf(dot);
       if (str.indexOf(at)==-1) return false;
       if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) return false;
       if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) return false;
       if (str.indexOf(at,(lat+1))!=-1) return false; if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) return false;
       if (str.indexOf(dot,(lat+2))==-1) return false;
       if (str.indexOf(" ")!=-1) return false;
       return true;
    }

    // the next function will be used to validate the form. I made this as a separate function because you might want to validate more fields.
    function validate_form()
    {
       if (!isMail(document.form1.mail.value))
       {
          alert("Please enter a valid email address");
          document.form1.mail.focus();
          return false;
       }
       // if the value entered is not a valid email address, 
       // we show a message, focus on the field and return false.
       // returning false will make sure the form is not submitted

       // if we got here, it means the email address is valid
       return true;
       // return true means that the form is submitted.
    }
    </script>

    After placing this function in the code, here is what you need to put in the form.

    Let's say the form only has the email address and a submit button.

    <form action="/" method="post" onsubmit="return validate_form()" name="form1">
    <input type="text" name="email" value="">
    <input type="submit" name="submit_button" value="continue">
    </form>