Category: Vue transition on change

Vue transition on change

In the code snippet above, you can see that we give the transition the name fadeand we set the mode property to out-inso the current page is first faded out before the new page is faded in.

Next up, we have to define our transition styles to make the fade transition work. In the JavaScript code block above, you can see the three new methods which are triggered by our transition hooks.

vue transition on change

The beforeLeave method gets the element of the current page as its only parameter; we can use this to get the height of the current page and save it for later usage. Next, we can see the enter method, which is responsible for actually triggering the transition of the height of the new page, to which we transition.

First, we get the final height of the new page and save it in a height variable. Next, we set the height of the new page to the height of the current page; this is our starting point for the transition.

And finally, we set the height of the new page to its original height back again. We do this inside a setTimeout function to make sure the browser has triggered a paint after setting the height of the new page to the height of the current page. After the entrance transition of the new page has finished, the afterEnter method is triggered.

Next, we set the height of the page back to auto to make sure its height is dynamic again. We do this in case new content is rendered or the size of the browser window changes. To animate the change of the height, we add the height to the list of transition properties. Also, we have to add overflow: hidden to make sure the height of the page is actually cut off and not visible until it has transitioned to its final height.

Register for the Newsletter of my upcoming book: Advanced Vue. So far, so good, the combination of transitioning the opacity and the height of the pages already looks pretty decent. But we still can do better and make an even more fancy page transition: we can use a sliding effect to transition between pages.

The following code is loosely based on some code from the official Vue Router documentation about route transitions. As you can see in the diff above, we add a new route for a sub page of the About page.

Note that we define a meta property on that new route. We can use the meta property to define a property; in this case, we named it transitionName but you can name it however you want.Learn Development at Frontend Masters. Vue offers several ways to control how an element or component visually appears when inserted into the DOM.

Examples can be fading in, sliding in, or other visual effects. Almost all of this functionality is based around a single component: the transition component.

A simple example of this is with a single v-if based on a Boolean. When the Boolean is true, the element appears. When the Boolean is false, the element disappears.

State Transitions

Normally, this element would just pop in and out of existence, but with the transition component you can control the visual effect. Several articles have been written that cover the transition component quite well, like articles from Sarah DrasnerNicolas Udyand Hassan Djirdeh.

The initial change this attribute offers is that the CSS classes injected onto the element during the transition sequence will be prefixed by the given name.

Basically, it would be fade-enter instead of v-enter from the example above. This single attribute can go well beyond this simple option. It can be used to leverage certain features of Vue and CSS which allows for some interesting outcomes. In this example, the transition will be named the value currentTransition resolves to.

With static and dynamic named transitions, a project can have a series of prebuilt transitions ready to apply throughout the entire app, components that can extend existing transitions applied to them, switch a transition being used before or after being applied, allowing users to choose transitions, and control how individual elements of a list transition into place based on the current state of that list.

By default, when a transition component is used, it applies specific classes in a specific sequence to the element. These classes can be leveraged in CSS. Without any CSS, these classes, in essence, do nothing for the element. Therefore, there is a need for CSS of this nature:. This causes the element to fade in and out with a duration of half a second. A minor change to the transition provides for elegant visual feedback to the user.

Still, there is an issue to consider. Essentially the same CSS but with fade- prefixed instead of v.

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This naming addresses the potential issue that can happen when using the default class names of the transition component. For small apps this may suffice, but in larger, more complex apps, it may lead to undesirable visual effects, as not everything should fade in and out over half a second. Naming transitions provides a level of control for developers throughout the project as to how different elements or components are inserted or removed visually. It is suggested that all transitions be named — even if there is just one — to establish the habit of doing so.

Even if an app has only one transition effect, there may be a need to add a new one at a future point. Having already named existing transitions in the project eases the effort of adding a new one. Naming transitions provides for a simple yet very useful process.

A common practice might be to create the transition classes as part of the component that is using them. If another common practice of scoping styles for a component is done, those classes will only be available to that particular component. If two different components have similar transitions in their style blocks, then we are just duplicating code. For most of my projects, I place them as the last section of the style block, making them easy to locate for adjustments and additions.

Keeping the CSS in this location makes the transition effects available to every use of the transition component throughout the entire app. Here are examples from some of my projects. There are multiple ways to store these transition classes depending on your preferences and the needs of the project.Vue provides a variety of ways to apply transition effects when items are inserted, updated, or removed from the DOM.

This includes tools to:. When an element wrapped in a transition component is inserted or removed, this is what happens:. Vue will automatically sniff whether the target element has CSS transitions or animations applied. If the transition component provided JavaScript hooksthese hooks will be called at appropriate timings.

Added before element is inserted, removed one frame after element is inserted. Applied during the entire entering phase. This class can be used to define the duration, delay and easing curve for the entering transition. Ending state for enter.

Added immediately when a leaving transition is triggered, removed after one frame. Applied during the entire leaving phase. This class can be used to define the duration, delay and easing curve for the leaving transition. Ending state for leave. Each of these classes will be prefixed with the name of the transition. CSS animations are applied in the same way as CSS transitions, the difference being that v-enter is not removed immediately after the element is inserted, but on an animationend event.

vue transition on change

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These will override the conventional class names. Vue needs to attach event listeners in order to know when a transition has ended. It can either be transitionend or animationenddepending on the type of CSS rules applied. If you are only using one or the other, Vue can automatically detect the correct type. However, in some cases you may want to have both on the same element, for example having a CSS animation triggered by Vue, along with a CSS transition effect on hover.

In these cases, you will have to explicitly declare the type you want Vue to care about in a type attribute, with a value of either animation or transition. Transitions Crash Course

In most cases, Vue can automatically figure out when the transition has finished. By default, Vue waits for the first transitionend or animationend event on the root transition element. However, this may not always be desired - for example, we may have a choreographed transition sequence where some nested inner elements have a delayed transition or a longer transition duration than the root transition element.

When using JavaScript-only transitions, the done callbacks are required for the enter and leave hooks. Otherwise, the hooks will be called synchronously and the transition will finish immediately. This also prevents CSS rules from accidentally interfering with the transition. If you also want to apply a transition on the initial render of a node, you can add the appear attribute:. By default, this will use the transitions specified for entering and leaving. In the example above, either appear attribute or v-on:appear hook will cause an appear transition.

One of the most common two-element transitions is between a list container and a message describing an empty list:. When toggling between elements that have the same tag nameyou must tell Vue that they are distinct elements by giving them unique key attributes.For example:. All of these are either already stored as raw numbers or can be converted into numbers. Watchers allow us to animate changes of any numerical property into another property. When you update the number, the change is animated below the input.

See this example for the complete code behind the above demo.

Vue Router Page Transitions with Fade, Slide and Zoom Effects

Managing many state transitions can quickly increase the complexity of a Vue instance or component. Fortunately, many animations can be extracted out into dedicated child components. Together, there are very few limits to what can be accomplished. To animate, by one definition, means to bring to life. Vue can help.

Since SVGs are just data, we only need examples of what these creatures look like when excited, thinking, or alarmed. Then Vue can help transition between these states, making your welcome pages, loading indicators, and notifications more emotionally compelling. Sarah Drasner demonstrates this in the demo below, using a combination of timed and interactivity-driven state changes:. Stay at home and level up. Special Sponsor. Platinum Sponsors.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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In Vue documentation there is only example how to show or hide element but what if you want to show some transition based on value change. For example if new value is higher then old then show an arrow up for 3 seconds and if value is lower than old one show arrow down for 3 seconds. How can I achieve that? As you can see css. Learn more. Asked 3 years ago. Active 3 years ago. Viewed 7k times. Did you see vuejs. Active Oldest Votes. Egor Stambakio Egor Stambakio Sign up or log in Sign up using Google.

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Related 3. Hot Network Questions.Learn Development at Frontend Masters. This is the fifth part in a five-part series about the JavaScript framework, Vue. This is not intended to be a complete guide, but rather an overview of the basics to get you up and running so you can get to know Vue. If you come from React, the concept behind the transition component will be familiar to you, because it works similarly to ReactCSSTransitionGroup in relationship to lifecycle hooks, but it has some notable differences that make nerds like me excited.

Transitioning state is out of the scope of this article, but it is possible. I could probably be convinced to write that article too, once I take a long nap. A transition basically works by interpolating the values from state to another. We can do great things with them, but they are rather simple.

Here, to there, and back again. Animations are a bit different in that you can make multiple states occur within one declaration. You can even chain many animations with delays for really complex movement. In terms of tools, both are useful. Think of transitions as a saw and animations as a powersaw.

Sometimes you just need to saw one thing and it would be silly to go out and buy really expensive equipment. For other more robust projects, it makes more sense to make the powersaw investment. The modal shows and hides on a click of a button. Based on the previous sections, we already know that we might: make a Vue instance with a button, make a child component from that instance, set the data on the state so that it toggles some sort of boolean and add an event handler to show and hide this child component.

We could use v-if or v-show to toggle the visibility. We might even use a slot to pass the button toggle into the modal as well. See the Pen by Sarah Drasner. This will give us a v- prefix for some transition hooks we can use in our CSS. This is normal CSS, you can pass in cubic-beziers for eases, delays, or specify other properties to transition.

Truthfully, this would also work just as well if you placed the transition in these classes on the component classes themselves as a default. The one reason I do use it on the enter-active and leave-active classes is that I can reuse the same transition for other elements as well, and not run around the codebase applying the same default CSS to each instance.

This works and looks fine for something like opacity. I find it makes the animation look more… classy har har. These will be the first and last positions of the animation, the initial state as it mounts, the end state as it unmounts. You may think you need to set opacity: 1 on. CSS transitions and animations will always use the default state unless told otherwise.

This works nicely! But what would happen if we wanted to make that background content fade out of view, so that the modal took center stage and the background lost focus? What we can do is transition classes based on the state, and use the classes to create CSS transitions that alter the background:.

Now that we understand how transitions work, we can build off of those core concepts to create some nice CSS animations. In the last section, we talked a little about how you can designate a special name for the transition component that we can then use as class hooks.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to use the css transition property to fade the app background from black to white by adding a class of.

The adding of. Do I have to add the Vue transition element? And if so how? To answer your question if you have to use transition for something like this, the answer is no.

The solution you proposed should work out of the box. There is probably something else that is interfering with your code, but the one you posted is correct. Learn more. Asked 2 years, 6 months ago. Active 2 years, 6 months ago. Viewed 6k times. Leah Leah 3 3 silver badges 6 6 bronze badges. Active Oldest Votes. I attached the working snippet.

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vue transition on change

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