Issue with Vue.js: The method this.$refs.key is returning either an empty array or undefined instead of the expected

I implemented a dialog window component in Vue 2 that listens to the event tcs-show-confirm (which triggers the dialog display by setting the show property to true in a parent component):

  @Prop({ default: false })
  show: boolean;

  @Prop()
  buttons: Array<TcsDialogButton>;

  mounted() {

    this.$nextTick(function () {
      TcsEventBus.$on('tcs-show-confirm', () => {
        console.log(this.$refs.tcsdialbuttons);
      });
    });
  }

The HTML structure of the component, specifically regarding the footer slot content remains intact:

  ...
  <slot name="footer">
    <div v-if="buttons && buttons.length" ref="tcsdialbuttons" v-for="(button, index) in buttons">
      <button tabindex="0" class="tcs-button tcs-dialog__button" @click="$emit('close', button.emitString)">
        {{button.text}}
      </button>              
    </div>
    <div style="clear: both;"></div>
  </slot>
  ...

An issue arises when attempting to access the buttons as console.log(this.$refs.tcsdialbuttons) returns an empty array [] with length 0. I am puzzled by this behavior and how to focus on the first button.


In an attempt to resolve the issue, I changed the fat arrow function to a normal function:

      TcsEventBus.$on('tcs-show-confirm', function() {
        console.log(this.$refs.tcsdialbuttons);
      });

However, this results in a return value of undefined.


Curiously, despite successful element referencing in other components within my project, I encounter difficulties accessing elements within this particular component. The reason behind this inconsistency eludes me.

Answer №1

Here are two key practices to consider initially:

  • Check out this link for avoiding v-if with v-for
  • Learn more about requiring a key in v-for loops here

Once you've addressed those points, I recommend adding an index to your v-for loop and attaching :ref to each button individually so they can be accessed in a function.

For guidance on working with array items using ref, you can refer to this article: Troubleshooting 'this.$refs[p + index].focus is not a function'

To set focus on the first button, you could use something like this.$refs[button${index}][0].focus();

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