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jqueryemail-validation

Validate format of an email address - no regex, no plugins jquery

I've got a function which almost works - it validates an email address format in the following form:

  • Must have an @ symbol
  • Must have some string after @ symbol.
  • Must have a '.' followed by another string after that.

It doesn't work at the moment because I don't know how to correctly insert a variable that accepts any string that the user inputs - how can this be achieved?

Solution

  • I am not going to profess to being an email validation expert.

    If you really must not use regex, could do something along the lines of:

    function validateEmail(str){
   var index_at= str.indexOf('@')
   if( index_at === -1){
       return false;
   }   

    var name= str.substr(0,index_at);
     /* should test name for other invalids*/

    var domain=str.substr(index_at+1);
    /* should check for extra "@" and any other checks that would invalidate an address of which there are likely many*/
    if( domain.indexOf('@') !=-1){
        return false;
    }
    /* dot can't be first character of domain*/
   return domain.indexOf('.') >0;

}

    DEMO: http://jsfiddle.net/v43Hw/

    Strongly recommend using a regex that has been tested against email standards for greater reliability.