What is the functionality of this.$eval in Vue.js?

Question

What is the functionality of this.$eval in Vue.js?

During the process of updating an unfamiliar old script from version 0.11 to 2.5.4, an alert popped up stating:

To address the warning message saying 'Replace this.$eval('reportData | reportFilter false') with a solution using normal JavaScript', Line 327 in assets/js/custom-reports.js file needs attention. This is due to vm.$eval being removed as it does not serve any real purpose anymore. For more information visit: http://vuejs.org/guide/migration.html#vm-eval

Upon examining the code, it was noted that certain values were being set, for example:

this.$set('reportData[' + key + '].selected', !selectAll);

These values are then used here:

var data = this.$eval('reportData | reportFilter false');

Seeking assistance to understand the underlying issue and how to rewrite this functionality in a new manner.

javascript vue.js

Answer 1

Answer №1

It appears that the code is filtering the data using a filter called `reportFilter` with a parameter of `false`. In Vue 2, filters work differently and you will need to move `reportFilter` to a method. If this method is used in multiple components, consider creating a mixin:

// Filters mixin
const Filters = {
  methods:{
    reportFilter(data, flag){
      // reportFilter method
    }
  }

}

Then add the mixin to components where `reportFilter` is used:

new Vue({
  // ...
  mixins: [Filters],
  // ...
})

You can update your code to use the `reportFilter` method like this:

var data = this.reportFilter(reportData, false);

Check out this JSFiddle for a visual example: https://jsfiddle.net/4b8vqccs/

Answer 2

It appears that the code is filtering the data using a filter called `reportFilter` with a parameter of `false`. In Vue 2, filters work differently and you will need to move `reportFilter` to a method. If this method is used in multiple components, consider creating a mixin:

// Filters mixin
const Filters = {
  methods:{
    reportFilter(data, flag){
      // reportFilter method
    }
  }

}

Then add the mixin to components where `reportFilter` is used:

new Vue({
  // ...
  mixins: [Filters],
  // ...
})

You can update your code to use the `reportFilter` method like this:

var data = this.reportFilter(reportData, false);

Check out this JSFiddle for a visual example: https://jsfiddle.net/4b8vqccs/

What is the functionality of this.$eval in Vue.js?

Answer №1

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