Attach event to dynamic elements in javascript

Question

I'm trying to insert html data dynamically to a list that is dynamically created, but when i try to attach an onclick event for the button that is dynamically created the event is not firing. Solution would be really appreciated.

Javascript code:

document.addEventListener('DOMContentLoaded', function () {
   document.getElementById('btnSubmit').addEventListener('click', function () {
        var name = document.getElementById('txtName').value;
        var mobile = document.getElementById('txtMobile').value;
        var html = '<ul>';
        for (i = 0; i < 5; i++) {
            html = html + '<li>' + name + i + '</li>';
        }
        html = html + '</ul>';

        html = html + '<input type="button" value="prepend" id="btnPrepend" />';
        document.getElementsByTagName('form')[0].insertAdjacentHTML('afterend', html);
    });

    document.getElementById('btnPrepend').addEventListener('click', function () {
        var html = '<li>Prepending data</li>';
        document.getElementsByTagName('ul')[0].insertAdjacentHTML('afterbegin', html);
    });
});

HTML Code:

<form>
    <div class="control">
        <label>Name</label>
        <input id="txtName" name="txtName" type="text" />
    </div>
    <div class="control">
        <label>Mobile</label>
        <input id="txtMobile" type="text" />
    </div>
    <div class="control">
        <input id="btnSubmit" type="button" value="submit" />
    </div>
</form>

Answer 1

This is due to the fact that your element is dynamically created. You should use event delegation to handle the event.

 document.addEventListener('click',function(e){
    if(e.target && e.target.id== 'brnPrepend'){
          //do something
     }
 });

jquery makes it easier:

 $(document).on('click','#btnPrepend',function(){//do something})

Here is an article about event delegation event delegation article

Answer 2

There is a workaround by capturing clicks on document.body and then checking event target.

document.body.addEventListener( 'click', function ( event ) {
  if( event.target.id == 'btnSubmit' ) {
    someFunc();
  };
} );