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Polymer – Bind events to dynamically created elements

Asked By: Anonymous

I’m trying to create a polymer component that will make an ajax call and populate a list based on the response, and I’d also like to add a click / tap event to each list element to do something when I click on a list item.

I create the list like so:

  populateList: function(items) {
    if (items.length == 0) {
      return;
    }
    var menu = this.$$('.mp-Autocomplete-dropdown-menu');
    var node = null;

    for (var k = 0; k < items.length; k++) {
      node = document.createElement('li');
      node.setAttribute('class', 'style-scope mp-autocomplete');
      node.setAttribute('tabindex', '0');

      node.innerHTML = items[k];
      menu.appendChild(node);
      this.listen(this.$$('li'), 'click', '_itemTapHandler');

      .addEventListener('')
    }
  },

But the ‘listen’ doesn’t work, and I can’t find anything else in the polymer docs which might help me – without going outside the component and invoking straight js on the complete document, which would not be good …… Can anyone help me ?

Thanks,
Colm


Solution

Answered By: Anonymous

this.$$('li') always returns the first <li> element in your element, that is probably not what you want.

Use instead:

this.listen(node, 'click', '_itemTapHandler');

and if you want to remove it later

var node = ... /* get reference to node */

this.unlisten(node, 'click', '_itemTapHandler');

See also https://www.polymer-project.org/1.0/docs/devguide/events.html#imperative-listeners

techinplanet staff


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