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en:modul:m291:learningunits:lu05:theorie:04 [2025/03/14 12:34] – vdemiren:modul:m291:learningunits:lu05:theorie:04 [2025/03/14 13:46] (aktuell) – vdemir
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-====== LU05d - v-show - TBD ======+====== LU05d - v-show ======
  
 ===== Learning ojectives ===== ===== Learning ojectives =====
-  - .... +  - I can explain what directive v-show fulfil within the DOM. 
-  - +  - I can prove the visibility of objects using v-show. 
 +  - I can use the v-show directive. 
 + 
 +====== Sources ====== 
 +  * [[https://www.w3schools.com/vue/vue_v-show.php|W3School | W3School | Conditional Rendering - v-show]] 
 +  * [[https://vuejs.org/guide/essentials/conditional.html#v-show | Vuejs.org | Conditional Rendering - v-show]] 
 + 
 ===== Introduction ==== ===== Introduction ====
 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 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:+The syntax is simple: isVisible controls the visibility of the element dynamically
  
   <div v-show="isVisible">Content</div>   <div v-show="isVisible">Content</div>
- 
-, where isVisible controls the visibility of the element dynamically 
  
 ===== Example ===== ===== Example =====
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 **Explanation:** **Explanation:**
-The v-show="isVisible" directive controls the visibility of the <p> element.+  * The v-show="isVisible" directive controls the visibility of the <p> element.
   * Clicking the button toggles isVisible between true and false.   * Clicking the button toggles isVisible between true and false.
   * Instead of removing the element from the DOM, Vue modifies its display property.   * Instead of removing the element from the DOM, Vue modifies its display property.
 +
 +===== v-if VS v-show =====
 +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. 
 +
 +===== Demonstration =====
 +
 +[[https://www.w3schools.com/vue/tryit.php?filename=tryvue_v-show_div2 | v-show VS v-if]]
 +
 +  * **v-show:** Hides only an object, it is still accessible for fold-in or fold-out
 +  * **v-if:** The object of concern is no longer existing, as it was destroyed from 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 | 
 + 
  
 ===== Vocabulary ===== ===== Vocabulary =====
 ^ English ^ German ^  ^ English ^ German ^ 
 | conditionally | bedingt | | conditionally | bedingt |
 +| to fold in/out | einklppen/ausklappen |
  
 ---- ----
 [[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir [[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir
  
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  • Zuletzt geändert: 2025/03/14 12:34
  • von vdemir