The Difference Between v-if and v-show

The v-if directive and the v-show directive can dynamically control the display and hiding of DOM elements based on their values. v-if and v-show are commonly used directives internally in Vue. The responsibility of a directive is to apply some special behavior to the DOM when the value of an expression changes.

Description

v-if

The v-if directive is used to conditionally render a block of content, which will only be rendered when the expression of the directive returns a truthy value.

<div v-if="show">show</div>
<div v-else>hide</div>

v-show

The usage of the v-show directive is similar, but the difference is that the element with the v-show directive will always be rendered and kept in the DOM. v-show simply toggles the CSS property display of the element.

<div v-show="show">show</div>

Difference

  • Implementation: v-if dynamically adds or removes DOM elements within the DOM tree, while v-show controls visibility by setting the display style property of DOM elements.
  • Compilation process: v-if toggle involves a partial compilation and unmounting process; during the toggle process, the internal event listeners and child components are properly destroyed and rebuilt. On the other hand, v-show simply toggles based on CSS.
  • Compilation condition: v-if is lazy; if the initial condition is false, nothing will be done. Partial compilation only starts when the condition first becomes true. v-show is compiled under any condition, and then cached, while DOM elements are retained.
  • Performance cost: v-if has higher toggle cost, while v-show has higher initial rendering cost.
  • Use cases: v-if is suitable for situations where the condition is less likely to change, while v-show is suitable for frequently changing conditions.

Daily Question

https://github.com/WindrunnerMax/EveryDay

References

https://cn.vuejs.org/v2/guide/conditional.html#v-if https://www.cnblogs.com/dengyao-blogs/p/11378228.html https://cn.vuejs.org/v2/guide/conditional.html#v-show
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