The difference between v-if and v-show in vue

The difference between v-if and v-show in Vue.js: v-if directly removes DOM elements, v-show controls visibility through CSS and does not remove DOM. v-if is more performant, v-show is slightly less performant because it triggers CSS reflow. v-if triggers the element switching animation, v-show does not trigger the animation when switching back to visible. v-if is suitable for scenarios that require dynamic addition or removal of DOM, while v-show is suitable for scenarios that require frequent visibility switching but do not involve changes to the DOM structure.

The difference between v-if and v-show in Vue

The Vue.js framework provides two instructions v-if and v-show to control the display and hiding of elements. Although both instructions can achieve similar functionality, there are some key differences in how they are implemented and used.

1. Rendering method

• #v-if: Remove DOM elements directly during the compilation phase (template is converted to render function) , only render the DOM part that meets the conditions.
• v-show: Control the visibility of DOM elements at runtime via the CSS display property, but does not remove the DOM.

2. Performance impact

• v-if: Usually performance is higher because it reduces the number of DOM operations quantity.
• v-show: Slightly lower performance because CSS reflow is triggered every time the visibility is toggled.

3. Animation effect

• v-if: The appearance and disappearance of elements will trigger the animation of element switching.
• v-show: The animation will not be triggered when the element is switched to display: none, and will be displayed immediately when switched back to display: block.

4. Usage scenarios

• v-if: Recommended for situations where DOM elements need to be added or deleted dynamically , such as conditionally rendering list items or switching components.
• v-show: Suitable for situations where frequent switching of element visibility is required but does not involve changes to the DOM structure, such as switching buttons or panels.

Summary

v-if and v-show are two useful instructions in Vue.js to control the display and hiding of elements. v-if is more performant and removes the DOM directly at compile time, while v-show allows visibility to be controlled via CSS at runtime. Choosing the right directive based on your specific use case and performance requirements is critical.

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