This is especially useful when you dont know the exact content youre going to render ahead of time, like when fetching posts from an API.
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Props are custom attributes you can register on a component.
blog-post Then the value will be passed as the first parameter of that method: methods: onEnlargeText: function (enlargeAmount) this.
postFontSize: 1 ) Which can be used in the template to control the font size of all blog posts: div id"blog-posts-events-demo" div :style" fontSize: postFontSize 'em' " blog-post v-for"post in posts" v-bind:key" v-bind:post"post" /blog-post /div /div Now lets add a button to enlarge the text.For example, keno lördag we may want the blog-post component to be in charge of how much to enlarge the text.So far, weve only registered components globally, using mponent: mponent my-component-name /.The problem is, that component wont be useful unless you can pass data to it, such as the title and content of the specific post we want to display.Thats where props come.V-on:enlarge-text"postFontSize.1" /blog-post Emitting a Value With an Event Its sometimes useful to emit a specific value with an event.In the template above, youll see that we can access this value on the component instance, just like with data.
With Babel or TypeScript use newline escapes instead.
Dynamic Components Sometimes, its useful to dynamically switch between components, like in a tabbed interface: The above is made possible by Vues component element with the is special attribute:!- Component changes when currentTabComponent changes - baccarat kortspel component In the example above, currentTabComponent can contain either: the.
button ' components are reusable Vue instances with a name: in this case, button-counter.
Once a prop is registered, you can pass data to it as a custom attribute, like this: blog-post title"My journey with Vue" /blog-post blog-post title"Blogging with Vue" /blog-post blog-post title"Why Vue is so fun" /blog-post In a typical app, however, youll likely have an array.
Defining a prop for each related piece of information could become very annoying: blog-post v-for"post in posts" v-bind:key" v-bind:title"post.In those cases, we can use emits 2nd parameter to provide this value: button.1 Enlarge text /button Then when we listen to the event in the parent, we can access the emitted events value with event: blog-post.When building out a blog-post component, your template will eventually contain more than just the title: h3 title /h3 At the very least, youll want to include the posts content: h3 title /h3 div If you try this in your template however, Vue will show.We can use this component as a custom element inside a root Vue instance created with new Vue: div id"components-demo" /div new Vue( el: components-demo' since components are reusable Vue instances, they accept the same options as new Vue, such as data, computed, watch, methods.Fortunately, Vue instances provide a custom events system to solve this problem.For example, we may decide to include an accessibility feature to enlarge the text of blog posts, while leaving the rest of the page its default size: In the parent, we can support this feature by adding a postFontSize data property: new Vue( el: blog-posts-events-demo.V-on:enlarge-text"postFontSize event" /blog-post Or, if the event handler is a method: blog-post.To use these components in templates, they must be registered so that Vue knows about them.This will lead to issues when using components with elements that have such restrictions.