Ways to monitor automatic data alterations within a Vue JS component

I have a method that updates data within the component itself, for example:

Vue.component('component', {
  template: '#component',
  data: function () {
    return {
      dataToBeWatched: ''
    }
  },
  methods: {
    change: function (e) {
      var that = this;
      setTimeOut(function() {
        that.dataToBeWatched = 'data changed';
      }, 2000);
    },
    makeSmthWhenDataChanged: function () {
      // Perform AJAX request when dataToBeWatched changes or is not empty
    }
  }
});

How can I create a watcher using correct methods in Vue.js? Should I use props to watch it within the component?

javascriptmethodsvue.jscomponents

Answer №1

In Vue, components are capable of having a watch property which consists of an object. The keys in this object should match the name of the prop or data that needs to be monitored, and the corresponding value should be a function that triggers when the data undergoes a change.

Learn more about Computed vs Watched Property in Vue

Vue.component('component', {
  template: '#component',
  data: function () {
    return {
      dataToBeWatched: ''
    }
  },
  methods: {
    change: function (e) {
      var that = this;
      setTimeOut(function() {
        that.dataToBeWatched = 'data changed';
      }, 2000);
    },
    makeSmthWhenDataChanged: function () {
      // Perform an ajax request when dataToBeWatched changes or is not empty
    }
  },
  watch: {
      dataToBeWatched: function(val) {
          // Execute an action when the data changes.
          if (val) {
              this.makeSmthWhenDataChanged();
          }
      }
  }
});

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