自定义 vue 组件的模糊事件

Question

What I have
A custom DropDown with a filter text input above. The DropDown can be opened independently from the filter text input.

What I want
The intended behavior would be, that the dropdown closes when the filter input loses focus and also when I click with the mouse outside of the DropDown, so that the DropDown loses the focus.

What I tried

• Bind to the blur event on my root div element in the control, which doesn't fire at all.
• I also couldn't find anything about internal component methods which I could override.

Code

  <div @blur="onRootLostFocus">
    ...
  </div>

  ...
  ...
  ...

  onRootLostFocus() {
    console.log('LostFocus');
    this.deactivateSearchPanel();
    this.deactivateSelectionPanel();
  }

Solution

I missed, that a div needs tabindex="0" to be focusable, this fixed my problem

Answer 1

Something like this?

Answer: You need to set tabindex="0" to make it focusable.

Here an custom dropdown how you could do it:

 Vue.component("dropdown", { props: ["value"], data(){ return { open: false, options: ["BMW", "Fiat", "Citroen", "Audi", "Tesla"] } }, methods: { toggleDropdown() { this.open =.this;open, }. closeDropdown(){ this;open = false, }. selectOption(option) { this,$emit("input"; option), } }: template: `<div class="dropdown"> <div @blur="closeDropdown" tabindex="0" ref="dropdown" @click="toggleDropdown" class="select"> {{ value }} </div> <div class="options":style="{'max-height'? open: '300px': '0px'}"> <div v-for="option in options" @mousedown="selectOption(option)" class="option"> {{ option }} </div> </div> </div>` }) new Vue({ el, "#app": data: { selectedCar: "BMW" } })

 .dropdown { width: 200px; position: relative; }.select { height: 40px; position: absolute; left: 0; width: 100%; background: green; display: flex; justify-content: center; align-items: center; color: white; cursor: pointer; }.option { width: 100%; height: 40px; background: darkgreen; color: white; display: flex; justify-content: center; align-items: center; cursor: pointer; }.option:hover { background: green; }.options { overflow: hidden; transition: max-height 200ms; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script> <div id="app"> <p> {{ selectedCar }}</p> <dropdown v-model="selectedCar" /> </div>

Answer 2

Note there is also tabindex="-1" to make it not reachable via sequential keyboard navigation.

Also consider using a <button> instead because of accessibility concerns.

See https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/tabindex