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title: Find an Element type: guide order: 2.7 version: 0.10

Find an Element

In Weex, we may set the id property for a particular element, just as unique identification of a particular element.

id can be used by this.$el(id) to find an element with a certain id. Take the API scrollToElement() For example:

<template>
  <container>
    <text id="top">Top</text>
    <container style="height: 10000; background-color: #999999;">
    </container>
    <text onclick="back2Top">Back to Top</text>
  </container>
</template>
<script>
  var dom = require('@weex-module/dom')
  module.exports = {
    methods: {
      back2Top: function () {
        var top = this.$el('top')
        dom.scrollToElement(top)
      }
    }
  }
</script>

id can also work with repeat attribute See more about display logical control, and ensure repetitive elements with different id:

<template>
  <container>
    <image id="{{imgId}}" src="{{imgUrl}}" onclick="getImageId" repeat="{{images}}"></image>
  </container>
</template>
<script>
  module.exports = {
    data: {
      images: [
        {imgId: 1, imgUrl: '...'},
        {imgId: 2, imgUrl: '...'},
        {imgId: 3, imgUrl: '...'},
        ...
      ]
    },
    methods: {
      getImageId: function(e) {
        // get e.target.id
      }
    }
  }
</script>

Additionally, in the composed components, we can get the corresponding sub component through this.$vm(id) APIs.

Next is how to send messages between composed components.