JavaScript VueJs: Focus on Input using v-el Directive inside v-repeat Directive vuejs focus input on load,vuejs focus input,vuejs focus

I display a list by using the v-repeat directive.

Please notice the dynamically created argument of the v-el directive, which is made of

v-el="inputField{{task.id}}"

or alternatively

v-el="{{'inputField' + task.id }}"

Still it doesn't get recognized, since I get:

Uncaught TypeError: Cannot read property 'focus' of undefined

I want to click the edit button and have the according input field focused on.

A similar syntax works, when I dynamically add a css class. Just uncomment the line with the .focus() and click "edit".

		new Vue({
		  el: '#tasks',

		  data: {
		    "tasks": [{
		      "id": 25,
		      "body": "Slack Noooo Yes",
		      "completed": true,
		      "created_at": "2015-08-05 17:00:26",
		      "updated_at": "2015-08-05 17:00:26"
		    }, {
		      "id": 27,
		      "body": "And",
		      "completed": false,
		      "created_at": "2015-08-05 17:22:14",
		      "updated_at": "2015-08-05 17:22:14"
		    }, {
		      "id": 28,
		      "body": "Happiness",
		      "completed": false,
		      "created_at": "2015-08-05 17:22:16",
		      "updated_at": "2015-08-05 17:22:16"
		    }, {
		      "id": 29,
		      "body": "Love",
		      "completed": true,
		      "created_at": "2015-08-06 07:45:02",
		      "updated_at": "2015-08-06 07:45:02"
		    }],

		    newTask: ''
		  },

		  methods: {
		    editTask: function(task) {

		      var inputField = 'inputField' + task.id;
		      alert(inputField);

		      var self = this;
		      self.$$.inputField.focus();

		      document.querySelector(".task" + task.id).className += " edit";
		    }
		  }
		});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/0.12.8/vue.min.js"></script>
<table class="table" id="tasks">
  <thead>
    <tr>
      <th>Task</th>
      <th>Edit</th>
      <th>Options</th>
    </tr>
  </thead>
  <tbody>
    <tr v-repeat="task: tasks">
      <td class="todo">
        <span class="task{{ task.id }}" v-on="dblclick: editTask(task)">
						{{ task.body }}
					</span>
      </td>
      <td>
        <input type="text" class="editInputField" v-el="inputField{{ task.id }}" value="{{ task.body }}" v-on="keyup:editTask(task) | key 'enter'">
      </td>
      <td>
        <button class="btn btn-xs btn-primary" v-on="click: editTask(task)">Edit</button>
      </td>
    </tr>
  </tbody>
</table>

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