What should I do if uniapp does not support this.$refs?

As a developer, if you are developing using the uniapp framework, you may encounter some problems. One of them is that uniapp does not support the use of this.$refs syntax. This article will explore this problem and how to solve it.

First of all, we need to understand what this.$refs is and what it does. In the Vue.js framework, this.$refs is used to obtain references to subcomponents or DOM elements. Use this.$refs to easily access and modify components and DOM elements. However, since the uniapp framework adopts a development model based on small program extensions, this.$refs is not supported in uniapp.

So, how to get the reference of subcomponent or DOM element in uniapp? The answer is to use the API provided by uniapp to operate. uniapp provides many APIs, such as univerify authorization verification, uni.request network request, uni.showToast prompt box, etc. To obtain references to subcomponents or DOM elements, we can use the API provided by uni-app - uni.createSelectorQuery().

uni.createSelectorQuery() provides a method to select nodes on the page, and returns a query object. For this query object, we can use the methods it provides, such as select, selectAll, boundingClientRect, etc. to obtain the node information we need. Let's look at an example:

<template>
  <view>
    <button @click="handleClick">获取节点信息</button>
    <view ref="myView">{{ message }}</view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello uniapp!',
      myViewRect: null
    }
  },
  methods: {
    handleClick() {
      uni.createSelectorQuery().select('.myView').boundingClientRect(rect => {
        this.myViewRect = rect
        console.log(this.myViewRect)
      }).exec()
    }
  }
}
</script>

In this example, we use the view tag, set the ref attribute to the view tag, and set an attribute named myView. In this example, we obtain the information of the myView node through the this.myViewRect property. When the button is clicked, we use uni.createSelectorQuery(), and use the .select() method to select the node we need, then use the .boundingClientRect() method to obtain the information of this node, and finally use the .exec() method to execute this operation. In the callback function, we obtained the information of the myView node, assigned it to the myViewRect property, and then printed this property on the console.

In short, although the uniapp framework does not support the use of this.$refs syntax, we can still use other methods to obtain references to subcomponents or DOM elements. I believe that after mastering the uni.createSelectorQuery() API, you can easily obtain the node information you need to achieve your business needs.

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