Vuejs 无法从组件访问 refs [英] Vuejs can't access refs from component

问题描述

我正在尝试获取组件模板内的画布元素，找到了适用于 vuejs1 的出色文档，但没有找到适用于ref"的 vuejs2 文档.是获取元素的唯一方法.虽然我正在获取对象，但是当我尝试访问该变量时，它是未定义的.

HTML

</模板>

JS

常量 ic = {模板: '#image-capture' ,创建(){console.log(this.$refs);//这个返回对象console.log(this.$refs.icanvas);//但这是未定义的}}const 路由 = [{路径:'/ic'，组件:ic}，]const 路由器 = 新的 VueRouter({路线})新的 Vue({路由器，}).$mount('#app')

我需要获取 icanvas 元素.

解决方案

created 在处理模板之前被触发.
您可以在此处找到更多详细信息:https://vuejs.org/v2/guide/instance.html#Lifecycle-Diagram

您应该能够在 mounted 事件中访问 $refs

挂载:function() {console.log(this.$refs.icanvas);},

I am trying to get the canvas element which is inside a template of a component, found great documentations for vuejs1 but not for vuejs2 where "ref" is the only way to get the element. I am getting the object though, but when I try to access the variable it is undefined.

HTML

<div id="app>
  <template id="image-capture">
    <div class="row" >
      <canvas ref="icanvas" ></canvas>
    </div>
  </template>
</div>

JS

const ic = {
  template: '#image-capture' ,
   
  created () {
    console.log(this.$refs); //this returns object
    console.log(this.$refs.icanvas); // but this is undefined
  }
}

const routes = [
  { path: '/ic', component:   ic},
]

const router = new VueRouter({
  routes 
})

 new Vue({
  router,
   }).

$mount('#app')

I need to get the icanvas element.

解决方案

The created is fired before the template is processed.
You can find more details here: https://vuejs.org/v2/guide/instance.html#Lifecycle-Diagram

You should be able to access the $refs on the mounted event

mounted: function() {
    console.log(this.$refs.icanvas);
},

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