VueJs:在v-repeat指令中使用v-el指令专注于输入

Question

我使用v-repeat指令显示一个列表.

http://jsfiddle.net/ftc9ev7p/1/

请注意v-el指令的动态创建的参数,该参数由

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

或者

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

仍然没有得到认可,因为我得到:

Uncaught TypeError: Cannot read property 'focus' of undefined

我想单击编辑按钮并关注相应的输入字段.

当我动态添加css类时,类似的语法有效.只需取消注释.focus()并单击"编辑".

		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>

这是jsfiddle:

http://jsfiddle.net/ftc9ev7p/1/

Answer 1

您不必真正按v-el对元素进行编号,因为您可以获得由v-repeat创建的子ViewModel.官方指南位于http://vuejs.org/guide/events.html#Invoke_Handler_with_Expression.

你可以通过this对editTask中v-on,然后你可以通过第一个参数获取子视图模型:

<div v-repeat="task: tasks">
  <span class="task" v-el="label" v-on="dblclick: editTask(this)">
  <input type="text" v-el="inputField" class="editInputField" value="{{ task.body }}">
</div>

editTask: function (task) {
    task.$$.inputField.focus();
    task.$$.label.className += " edit";
}

您也可以通过event.targetVM在函数中使用来获取targetVM,而无需将其传递给您的函数.

<div v-repeat="task: tasks">
  <span class="task" v-el="label" v-on="dblclick: editTask()">
  <input type="text" v-el="inputField" class="editInputField" value="{{ task.body }}">
</div>

editTask: function () {
    event.targetVM.$$.inputField.focus();
    event.targetVM.$$.label.className += " edit";
}

JS小提琴:http://jsfiddle.net/n1ef18uq/1/