How to get dom elements in vue

This article mainly introduces the precautions for vue to obtain dom elements and the content of vue to obtain dom elements. Friends in need can refer to it

mounted(){
    setTimeout(()=>{
     this.contentToggle();
    },1000)
  },

methods:{
   contentToggle(){
    console.log(this.$refs.bodyFont.offsetHeight);
   }
  }

If vue wants to obtain the height of dom elements, generally we all We can think of writing it in the mounted function, that is, getting it after the dom is loaded, but the result is not what we thought. We also thought of using a

this.$nextTick(()=>{
   
    //函数
})

to get it, but found that it is useless at all/. .

So a good way is to use a setTimeout timer. The time can be set to 0, but sometimes it takes effect and sometimes it does not take effect. It is safer to add a small time value, so that you can ensure that you get It must be after the dom is loaded. This principle applies to many value transfer problems in Vue. If you cannot get the passed value at the beginning, just use a setTimeout.

ps: VUE gets the DOM element content

Get the dom element through ref

On the vue official website, check the ref Explanation

ref is used to register reference information to an element or subcomponent. Reference information will be registered on the $refs object of the parent component. If used on a normal DOM element, the reference points to the DOM element; if used on a subcomponent, the reference points to the component instance

When v-for is used on an element or component, the reference information will be Array containing DOM nodes or component instances

For example, the effect I want to achieve now is to click on the li generated with v-for and get the value of the element.

First, I need to get the currently clicked li element, what we have to do is

1. Add a click event and ref attribute to the dom

<li class="sidebar-list" v-for="(item, index) in meunList" @click="setPageMenu(index)" ref="menuItem">
  <router-link class="sidebar-a" :to="{ path: item.listLink }" >{{item.listTitle}}</router-link>
</li>

2. Then use ref

setPageMenu(index) {
//这个是获取当前menuItem值，用index来区分当前元素是v-for 产生的数组中的第几个数
  let getMenuText = this.$refs.menuItem[index].innerText;
}

in the click event method. The above is me I compiled it for everyone, I hope it will be helpful to everyone in the future.

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