How to check if on input matches a string pattern with jQuery

Question

My goal is to check if an email input field (as a user is typing characters into it), matches a pattern or not. This is my working example so far, but I feel stuck when it gets to the point of actually matching the process "while" typing...

Below is my working example which I'm trying to capitalize on...


   //...

    var $attemail = mtarget.find(".my-email-field"); //INPUT

    function validateEmail(email) {
      var re = /\S+@\S+\.\S+/;
      if (re.test(email) == false) {
        console.log('Email field is not valid');
        //issueFlag.push(noticeEmail);
      }
    }

    function checkEmailOnType() {
      $attemail.on("input", function(){
        var $characters = jQuer(this).val();

        if ($characters.toLowerCase())  {
            //IF MY CHARACTER TYPING IS PASSING OR NOT PASSING 
            //MY validateEmail() FUNCTION ABOVE, HOW DO WE SAY THAT?  
        }
      });
    }

    //...

Use return re.test(email) in validateEmail() and add it to your if ($characters.toLowerCase()) {. Yet I suggest to use it on blur or submit and not on input. I can be annoying to be pointed out the obivous before one is even finished typing. — Lain
– Lain, Commented Feb 22, 2022 at 15:22
I think I get what you are saying but how does that solve my problem in checkEmailOnType()? How do we check character typing against a function? ok,, if its just as easy as simply adding it inside the if, I'll feel like an idiot. — klewis
– klewis, Commented Feb 22, 2022 at 15:25
How do we check character typing against a function? by returning a value in that function. Yours as it is returns undefined which you can just change to return the result of re.test(email). — Lain
– Lain, Commented Feb 22, 2022 at 15:28
As it is right now the function function checkEmailOnType() { does not really serve any puropose. You can assign the handler well without it. — JavaScript
– JavaScript, Commented Feb 22, 2022 at 15:31

Lain · Accepted Answer · 2022-02-22 15:34:56Z

1

Add a return value to your function. Yours as it is returns undefined which you can just change to return the result of re.test(email).

//...

var $attemail = mtarget.find(".my-email-field"); //INPUT

function validateEmail(email) {
  var re = /\S+@\S+\.\S+/;
  return re.test(email)
}

//function checkEmailOnType() {
  $attemail.on("input", function(){
    var $characters = jQuer(this).val();

    if ($characters.toLowerCase())  {
        //IF MY CHARACTER TYPING IS PASSING OR NOT PASSING 
        //MY validateEmail() FUNCTION ABOVE, HOW DO WE SAY THAT?
        if(validateEmail($characters) == false){
            console.log('Email field is not valid')
        }
    }
  });
//}

//...

answered Feb 22, 2022 at 15:34

Lain

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