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Vue.js Element Ui – trap / lock focus when el-dialog is open

Asked By: Anonymous

As you can see here, when you open any dialog example and start pressing the tab key, the focus start highlighting the elements that are outside/behind the dialog. I was wondering if element-ui have something to offer which I missed to notice?

Anyhow, for now I am using vue-focus-lock but I wish something native to be offered by element-ui rather pulling a library to fix this issue.


Solution

Answered By: Anonymous

Here is answer to my own question:

First of all I tried to use vue-focus-lock plugin it works but also have issues when selecting the components like el-checkbox or el-radio. You can see the issue when the outside/behind content of el-dialog is more (below fold) then the checkbox or radio will not be checked.

Anyhow here is my solution, I have created a component FocusLock.vue:

<template lang="pug">
  div.dialog-focus-lock
    slot
</template>

<script>
export default {
  name: 'focus-lock',

  data() {
    return {
      focusableEls: [],
      firstFocusableEl: [],
      lastFocusableEl: [],
      focusedElBeforeOpen: document.activeElement,
    };
  },

  methods: {
    handleDialogFocusLock() {
      const selectors = '' +
        'a[href], ' +
        'input:not([disabled]), ' +
        'select:not([disabled]), ' +
        'textarea:not([disabled]), ' +
        'button:not([disabled])';

      const getEls = this.$el.querySelectorAll(selectors);

      this.focusableEls = Array.prototype.slice.call(getEls);
      [this.firstFocusableEl] = this.focusableEls; // get first array item
      [this.lastFocusableEl] = this.focusableEls.slice(-1); // get last array item

      this.$el.addEventListener('keydown', e => this.handleKeyDown(e));
      this.firstFocusableEl.focus();
    },

    handleBackwardTab(e) {
      if (document.activeElement === this.firstFocusableEl) {
        e.preventDefault();
        this.lastFocusableEl.focus();
      }
    },

    handleForwardTab(e) {
      if (document.activeElement === this.lastFocusableEl) {
        e.preventDefault();
        this.firstFocusableEl.focus();
      }
    },

    handleKeyDown(e) {
      const KEY_TAB = 9;

      switch (e.keyCode) {
        case KEY_TAB:
          if (this.focusableEls.length === 1) {
            e.preventDefault();
            break;
          }
          if (e.shiftKey) {
            this.handleBackwardTab(e);
          } else {
            this.handleForwardTab(e);
          }
          break;
        default:
          break;
      }
    },
  },

  mounted() {
    this.handleDialogFocusLock();
  },
};
</script>

I wanted the component to be available globally, so imported it in main.js or in your case just import it wherever you need.

import FocusLock from '@/components/partials/FocusLock.vue';
Vue.component('FocusLock', FocusLock);

And using them wherever I need, just like this:

<template lang="pug">
  focus-lock
    el-dialog(:visible.sync="dialogVisible")
      el-form(:model="editedItem")
        // form elements goes here
</template>

Took some help from HERE.

Also, I think you should not worry about handling this.$el.removeEventListener, this is taken care by vue.js, you can test by pasting below code in your browser console and run it when the el-dialog is open and run again when it’s closed.

Array.from(document.querySelectorAll('*'))
  .reduce(function(pre, dom){
    var clks = getEventListeners(dom).click;
    pre += clks ? clks.length || 0 : 0;
    return pre
  }, 0)

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