Generate and save a document

Upon clicking the button, I am trying to generate a CSV file and download it right away. My current approach is as follows:

html:

<a class="btn btn-primary" @click="downloadCsv">Download CSV</a>
  <a v-if="fileObjectUrl !== null" ref="downloadCsv" :download="fileName" 
     :href="fileObjectUrl"
     :downloadUrl="downloadurl"></a>

JavaScript:

downloadCsv () {
  let csv = this.createCsv()
  let blob = new Blob([csv], { type: 'text/csv' })
  this.fileObjectUrl = window.URL.createObjectURL(blob)
  this.$refs.downloadCsv.click()
},

However, this method does not work smoothly as Vue updates the fileObjectUrl with a delay, which causes the file to be downloaded only after clicking the button twice. Is there an alternative way to generate and download the file in sequence?

javascriptvue.js

Answer №1

Referencing Vue's Async Update Queue:

If you haven't already realized, Vue executes DOM updates asynchronously. When a data change is detected, it creates a queue and stores all the data changes that occur within the same event loop. If a watcher is triggered multiple times, it will be added to the queue only once. This mechanism of buffering and de-duplication helps in minimizing unnecessary computations and manipulations of the DOM. Subsequently, in the next event loop cycle, Vue processes the queue and carries out the necessary work.

At the point when you trigger the click(), Vue may not have updated the DOM yet, so you need to ensure that Vue waits for the next tick. To achieve this, schedule the click() action after the next tick using Vue.$nextTick().

Therefore, in your case, the solution would involve:

this.$nextTick(function(){
    this.$refs.downloadCsv.click();
});

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