V-if is “real” conditional rendering because it ensures that event listeners and child components inside the conditional block are properly destroyed and re-created during toggles. Note that v-show doesn’t support the element, nor does it work with v-else. The difference is that an element with v-show will always be rendered and remain in the DOM v-show only toggles the display CSS property of the element.
v-showĪnother option for conditionally displaying an element is the v-show directive. Note that the elements are still efficiently re-used, because they don’t have key attributes. Since both templates use the same elements, the is not replaced - just its placeholder.Ĭheck it out for yourself by entering some text in the input, then pressing the toggle button:
Then switching the loginType in the code above will not erase what the user has already entered. For example, if you allow users to toggle between multiple login types: Username Email Beyond helping make Vue very fast, this can have some useful advantages. Vue tries to render elements as efficiently as possible, often re-using them instead of rendering from scratch. Similar to v-else, a v-else-if element must immediately follow a v-if or a v-else-if element. The v-else-if, as the name suggests, serves as an “else if block” for v-if. You can use the v-else directive to indicate an “else block” for v-if: 0.5">Ī v-else element must immediately follow a v-if or a v-else-if element - otherwise it will not be recognized. The final rendered result will not include the element. But what if we want to toggle more than one element? In this case we can use v-if on a element, which serves as an invisible wrapper. It is also possible to add an “else block” with v-else: Vue is awesome! Oh no ? Conditional Groups with v-if on īecause v-if is a directive, it has to be attached to a single element. The block will only be rendered if the directive’s expression returns a truthy value. The directive v-if is used to conditionally render a block.
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