How to force reload / re - render in Vue. Js

Vue.js is typically reactive, automatically updating the DOM when corresponding data changes. However, in certain scenarios, you may need to force a Vue component to re-render even if its data remains unchanged. Here are several methods to achieve forced re-rendering:

1. Using the key Attribute

In Vue, you can force a component to re-render by changing its key attribute. The key attribute is a special Vue property used to track node identity, enabling forced re-rendering of the component.

vue
<template>
  <your-component :key="componentKey"></your-component>
</template>

<script>
export default {
  data() {
    return {
      componentKey: 0,
    };
  },
  methods: {
    reloadComponent() {
      this.componentKey += 1;
    }
  }
};
</script>

In this example, calling the reloadComponent method increments componentKey, causing your-component to be recreated and re-rendered.

2. Using the v-if Directive

Another approach is to leverage the v-if directive to control component rendering. By toggling the value of v-if on a variable, you can first destroy the component and then recreate it.

vue
<template>
  <your-component v-if="isComponentVisible"></your-component>
</template>

<script>
export default {
  data() {
    return {
      isComponentVisible: true,
    };
  },
  methods: {
    reloadComponent() {
      this.isComponentVisible = false;
      this.$nextTick(() => {
        this.isComponentVisible = true;
      });
    }
  }
};
</script>

Here, the reloadComponent method initially sets isComponentVisible to false, destroying the component. Using $nextTick, it waits for Vue to complete DOM updates before resetting isComponentVisible to true to re-render the component.

3. Using forceUpdate

Although not recommended as it violates Vue's reactivity principles, you can use the forceUpdate method of the Vue instance to force view updates.

javascript
this.$forceUpdate();

This triggers re-rendering of all child components within the component. Note that excessive use of $forceUpdate may cause performance issues as it bypasses Vue's reactivity system.

In summary, it is generally advisable to avoid forcing component re-renders and instead pursue solutions aligned with Vue's reactivity principles. Only employ the methods above when other approaches are impractical.