How to make a custom global component using Vue

I have studied Vue.js in the past two days and I feel that there is a lot of knowledge about components and it is very important, so this article mainly introduces you to the implementation method of custom global components in Vue. It is introduced through sample code. It is very detailed and has certain reference learning value for everyone to learn or use vue. Friends who need it can follow the editor to learn together.

Preface

#Sometimes when we are doing development, we want to write a plug-in ourselves and then we can use our own plug-in, that kind of There is a strong sense of accomplishment. Today I solved a problem that has been bothering me for a long time. I will record it now for future reference.

The knowledge point involved is the use of plug-ins in the Vue.js official website tutorial.

The method is as follows:

First of all, I encountered The problem is that if my custom component needs to be called multiple times in other components in the project, my previous solution is simply to reference it wherever it is needed. This undoubtedly adds a lot of code duplication.

When using some UI frameworks of Vue.js, I noticed that you only need to import the plug-in in the project's entry file and then follow Vue.use('plugin name'). In this way, the components and methods in this framework can be used throughout the project.

After consulting the information, I found that the custom component needs to provide an install method

import sideblockComponent from './sideBlock'
const defaultComponentName = 'sidebar'

const Sidebar = {
 install(Vue, options = {}) {
 const componentName = options.componentName || defaultComponentName //提供可选的组件名
 Vue.component(componentName, sideblockComponent)
 }
}
export default Sidebar

Introduce the component you wrote like this, then create an object and include an install method, and useVue.component()The method is registered as a Vue global component, and finally export default exports this object.

Now that the most critical step has been completed, the next step is the most critical step.

We need to introduce the just-made component into the project's entry file, and use the plug-in through Vue.use (introduced component).

At this point, a global Vue component is ready. While we provide the install method, we can also trigger the methods in the component through the Vue.$emit() method. However, recently when using Element UI, we found that the methods in their components are generally through Vue.$refs() to trigger. The specific reasons will be left for future research.

Basic usage of vue $refs

<p id="app">
<input type="text" ref="input1"/>
<button @click="add">添加</button>
</p>

<script>
new Vue({
  el: "#app",
  methods:{
  add:function(){
    this.$refs.input1.value ="22"; //this.$refs.input1 减少获取dom节点的消耗
    }
  }
})
</script>

Generally speaking, to obtain DOM elements, document.querySelector (".input1") is required to obtain them This dom node then gets the value of input1.

But after binding with ref, we no longer need to obtain the dom node. We can directly bind input1 to the above input and then call it in $refs.

Then call this in javascript: this.$refs.input1 This will reduce the consumption of obtaining dom nodes

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future. .

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