How to connect a Javascript/Jquery function with a html form?

Question

i want to create a form that extracts email addresses from input text , i know there is a lot of scripts which do this easily , but i want to create one by myself .
So i read , searched and tried but i couldn't see a result . here is my code , what is the problem ?

<html>
  <head>
    <script type="text/javascript">

    function extractEmails ( text ){
    return text.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);
    }

    // EXAMPLE #1
    var emails = extractEmails ( HugeListWithBulkTextIncludingEmailAddresses );
    document.write ( emails.join('\n') );


    // EXAMPLE #2 (jQuery)
    $(function(){
    $('#eform').submit(function(){
    $('#extractedemails').val( extractEmails($('#input').val() ).join('\n'));
    return false;
    });
    });

    </script>
  </head>

<body>
    <form name="myform" id="eform" action="javascript:extractEmails()">
        <input type="text" name="firstname">
        <input name="Submit"  type="submit" value="Update"/>
    </form>
    <textarea id="extractedemails">
    </textarea>
</body>
</html>

There is no element in your code with the id of input. Also, using javascript in the action attribute is not widely supported, attach your code to the submit event instead. — Rory McCrossan
– Rory McCrossan, Commented Oct 30, 2013 at 11:50

jofftiquez · Accepted Answer · 2013-10-30 12:31:09Z

i suggest you should use this :

onsubmit="return extractEmails()"

cause i noticed that your submit button doesnt call your function.

instead of :

action="javascript:extractEmails()"

try this form, you should also have an id to your input field :

<form name="myform" id="eform" onsubmit="return extractEmails()">
   <input type="text" name="firstname" id = "input">
   <input name="Submit"  type="submit" value="Update"/>
</form>

below is a little program i created, i'm not quite sure of what you want to achieve in your function but hopefully this might help you a little. :)

    <html>

<head>
    <script type="text/javascript">

        function extractEmails(){

            var input = document.getElementById('input').value;
            input.match(/([a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+)/gi);

            var textarea = document.getElementById('extractedemails');
            textarea.value = input;

        }

    </script>
  </head>

<body>
    <form name="myform" id="eform" onsubmit = "return extractEmails()">
        <input type="text" name="firstname" id = "input">
        <input name="Submit"  type="submit" value="Update"/>
    </form>
    <textarea id="extractedemails">
    </textarea>
</body>
</html>

it is based on your html happy coding :D

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