Exploring the Paste Event Data in VueJS

While working on a Vue app, I implemented a paste listener for a textarea to trigger validation code whenever a user pastes data into the field. However, despite being able to see the pasted data in the console under event -> target -> value, I am unable to access it using event.target.value. What could be the issue here?

Here's a minimal example:

<div id="app">
  <textarea name="myField" @paste="onPaste"></textarea>
  <p>Field name: {{ fieldName }}</p>
  <p>Pasted data: {{ pasted }}</p>
</div>
var app = new Vue({
  el: '#app',
  data: {
    fieldName: '',
    pasted: ''
  },
  methods: {
    onPaste(event){
        console.log(event)
        this.message = event.target.name
        this.paste = event.target.value
    }
  }
})

https://jsfiddle.net/feg8pcmv/

Answer №1

Initially, there is a small error in your jsfiddle code (this.paste instead of this.pasted).

Furthermore, make sure to utilize the "getData" method from the clipboardData property to retrieve the text.

https://developer.mozilla.org/en-US/docs/Web/API/Element/paste_event

this.pasted = event.clipboardData.getData('text')

https://jsfiddle.net/zfuwy9ep/

Moreover, if you aim to obtain the entire string within the text area after pasting, consider waiting for the current tasks in the event queue to finish before reading the textarea value

setTimeout(() => {
   console.log('textarea contents', event.target.value);
})

https://jsfiddle.net/cjq1bw5u/

Answer №2

Currently, as per the latest information available on MDN documentation regarding onpaste event,

The paste event is triggered when a user tries to paste text.

It's important to note that currently there isn't a direct DOM method to retrieve the pasted text; an nsIClipboard must be used for this purpose.

Furthermore, with the Clipboard API and its associated events still being in the drafting stage, ensuring compatibility with older browsers might pose challenges.

A workaround that some developers have resorted to involves using setTimeout:

  methods: {
    onPaste(event){
      setTimeout(() => {
      console.log(event);
      this.fieldName = event.target.name;
      this.pasted = event.target.value }, 100);
    }
  }

For further details, refer to this discussion on Stack Overflow.

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