What is the difference between v-show and v-if directives?

Answers

v-if only renders the element to the DOM if the expression passes whereas v-show renders all elements to the DOM and then uses the CSS display property to show/hide elements based on expression.
v-if supports v-else and v-else-if directives whereas v-show doesn't support else directives.
v-if supports tab but v-show doesn't support.
All of the above

# Understanding the Difference Between v-show and v-if Directives in Vue.js Vue.js, a popular JavaScript framework, utilizes directives as a means to manipulate the DOM. These directives offer a way of dynamically changing HTML attributes or elements. `v-show` and `v-if` are two commonly used directives that manage the visibility of elements, but they function rather differently. ```v-if``` and ```v-show``` both control whether an element will display based on the truthiness of the expression given. However, the method and timing of their rendering vary significantly. ## Understanding v-if Directive The `v-if` directive is a conditional directive in Vue.js that is used to conditionally render a block. When its condition is false, it prevents the rendering of an element completely. It is typically used when we need to display an element based on a certain condition. If the condition fails, then the DOM doesn't contain that element at all. Moreover, `v-if` supports usage along with `v-else` and `v-else-if` directives for adding more conditions. For instance, here's how you might use those directives: ```html

Condition 1 is true

Condition 2 is true

Neither condition is true

``` ## Understanding v-show Directive On the other hand, the `v-show` directive, which doesn't support else directives, also controls an element's visibility. It inserts all elements into the DOM irrespective of the condition and then uses CSS' `display` property to hide or show the elements. For instance: ```html

This div will be toggleable based on condition1

``` Unlike `v-if`, `v-show` keeps the element in the DOM, only changing its display based on the condition. ## Selecting Between v-if and v-show `v-if` is a "real" conditional. It ensures that event listeners or child components inside the conditional block are properly destroyed and re-created during toggles. This means `v-if` is lazy and switches only on the basis of conditions. If the condition is false on initial render, it won't even do anything. On the contrary, `v-show` is much simpler - the element will always be rendered and switched based only on CSS. This means `v-show` is not lazy and renders the element regardless of the initial condition. In conclusion, it is best to use `v-if` if the condition is not likely to change at runtime as it has a high toggle cost. `v-show` is advisable if conditions are likely to change frequently at runtime due to its low-cost visibility toggle.