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LU05d - v-show

  1. I can explain what directive v-show fulfil within the DOM.
  2. I can prove the visibility of objects using v-show.
  3. I can use the v-show directive.

Sources

The v-show directive in Vue.js is used to conditionally display elements based on a boolean expression. Unlike v-if, which completely removes elements from the DOM when the condition is false, v-show toggles the CSS display property, keeping the element in the DOM but hiding it visually. This makes v-show more efficient when elements need to be frequently shown or hidden without re-rendering. It is best suited for UI toggles, such as modals, dropdowns, or tooltips.

The syntax is simple: isVisible controls the visibility of the element dynamically

<div v-show="isVisible">Content</div>
<template>
  <div>
    <button @click="isVisible = !isVisible">
      Toggle Message
    </button>
    <p v-show="isVisible">Hello, Vue.js!</p>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        isVisible: true
      };
    }
  };
</script>

Explanation:

  • The v-show=„isVisible“ directive controls the visibility of the <p> element.
  • Clicking the button toggles isVisible between true and false.
  • Instead of removing the element from the DOM, Vue modifies its display property.

Both, v-if and v-show are conditional rendering, but unlike v-if, the v-show directive only„ make the object of concern invisible**, for it is yet hidden part of the HTML-DOM.

Feature v-if v-show
DOM Behavior Completely adds/removes elements from the DOM Only toggles the display property (keeps elements in the DOM)
Performance Better for infrequent changes (expensive re-rendering) Better for frequent toggling (faster updates)
Usage Case When elements are rarely shown/hidden When elements need to be toggled frequently
English German
conditionally bedingt

Volkan Demir

  • en/modul/m291/learningunits/lu05/theorie/04.1741955593.txt.gz
  • Zuletzt geändert: 2025/03/14 13:33
  • von vdemir