出处 转载与 b站up主 程序员小山与Bug

效果预览网址

https://sunzsh.github.io/vue-demos/#/ellipsis

视频讲解

程序员小山与Bug

自定义指令 trunced

https://github.com/sunzsh/vue-el-demo/blob/master/src/components/trunced.js

import ResizeObserver from 'resize-observer-polyfill';


const syncVar = (node, binding, vnode) => {
    
    
 if (binding.arg) {
    
    
   binding.value[binding.arg] = node.offsetWidth < node.scrollWidth
 } else {
    
    
   vnode.context[binding.expression] = node.offsetWidth < node.scrollWidth
 }
}

export default {
    
    
 install(Vue) {
    
    
   Vue.directive('trunced', {
    
    
     inserted: function(el, binding, vnode) {
    
    
       const node = binding.modifiers.parent ? el.parentNode : el
       syncVar(node, binding, vnode);

       const ro = new ResizeObserver((entries, observer) => {
    
    
         entries[0].target && syncVar(node, binding, vnode)
       });
       ro.observe(node);
     },
     componentUpdated: function(el, binding, vnode) {
    
    
       const node = binding.modifiers.parent ? el.parentNode : el
       syncVar(node, binding, vnode);
     }
   })
 }
};

使用

https://github.com/sunzsh/vue-el-demo/blob/master/src/views/ellipsis.vue

<template>
 <div>


   {
    
    {
    
     sl }}
   <br />
   <div v-trunced="sl" class="test"> {
    
    {
    
    value}}</div>
   <input v-model="value" />


 </div>
</template>

<script>
export default {
    
    
 data() {
    
    
   return {
    
    
     value: 'testtests',
     sl: false
   }
 }
}
</script>

<style scoped>
.test {
    
    
 background-color: red;
 color: #fff;
 width: 15%;
 overflow: hidden;
 text-overflow: ellipsis;
 white-space: nowrap;
}
</style>