Using Vue.js watchers can sometimes cause an endless loop

Question

Using Vue.js watchers can sometimes cause an endless loop

I'm working on a unique aspect ratio calculator. How can I ensure my code doesn't get stuck in an endless loop when dealing with 4 variables that are dependent on each other?

To address this, I implemented 4 watchers, each monitoring a specific data element.

watch: {
widthRatio(value) {
  this.pxWidth = (value * this.pxHeight) / this.heightRatio;
},
heightRatio(value) {
  this.pxHeight = (value * this.pxWidth) / this.widthRatio;
},
pxWidth(value) {
  //updates heightRatio and widthRatio accordingly
},
pxHeight(value) {
  //updates heightRatio and widthRatio accordingly
}

The goal is to enable the user to adjust the ratios dynamically, with those changes being reflected in the pixel values automatically. Additionally, users have the flexibility to modify pixel values, which will then impact the ratios accordingly.

javascript vue.js runtime-error infinite-loop

Answer 1

Answer №1

Using computed objects instead of watchers is a better practice.

Check out this simple example below.

<script src="https://vuejs.org/js/vue.js"></script>

<div id="app">
    <strong>Aspect Ratio</strong>: {{ar}}
</div>

<script>
    var vm = new Vue({
        el: '#app',
        data: { width: 16, height: 9 },
        computed: {
        ar () {
          return this.width / this.height
          }
        }
    });
</script>

Answer 2

Using computed objects instead of watchers is a better practice.

Check out this simple example below.

<script src="https://vuejs.org/js/vue.js"></script>

<div id="app">
    <strong>Aspect Ratio</strong>: {{ar}}
</div>

<script>
    var vm = new Vue({
        el: '#app',
        data: { width: 16, height: 9 },
        computed: {
        ar () {
          return this.width / this.height
          }
        }
    });
</script>

Answer 3

Answer №2

Instead of just returning those 4 values as data in the component, consider utilizing v-model so that whenever the user makes changes, it triggers a function to update all calculations and ensure everything is updated accordingly.

In my opinion, computed properties/getters and setters would have been a suitable alternative for this scenario.

Answer 4

Instead of just returning those 4 values as data in the component, consider utilizing v-model so that whenever the user makes changes, it triggers a function to update all calculations and ensure everything is updated accordingly.

In my opinion, computed properties/getters and setters would have been a suitable alternative for this scenario.

Using Vue.js watchers can sometimes cause an endless loop

Answer №1

Answer №2

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