We can use the v-for directive to render a list of items based on an array. The v-for directive requires a special syntax in the form of item in itemswhere items is the source data array and item is an alias for the array element being iterated on:. Inside v-for blocks we have full access to parent scope properties.
When iterating over an object, the order is based on the enumeration order of Object. If the order of the data items has changed, instead of moving the DOM elements to match the order of the items, Vue will patch each element in-place and make sure it reflects what should be rendered at that particular index. This default mode is efficient, but only suitable when your list render output does not rely on child component state or temporary DOM state e.
It is recommended to provide a key attribute with v-for whenever possible, unless the iterated DOM content is simple, or you are intentionally relying on the default behavior for performance gains. Use string or numeric values instead.
Vue.js: Get and Display JSON Data with Fetch and Axios
For detailed usage of the key attribute, please see the key API documentation. The wrapped methods are:. For example: example1. Mutation methods, as the name suggests, mutate the original array they are called on. In comparison, there are also non-mutating methods, e. When working with non-mutating methods, you can replace the old array with the new one:.
You might think this will cause Vue to throw away the existing DOM and re-render the entire list - luckily, that is not the case. Vue implements some smart heuristics to maximize DOM element reuse, so replacing an array with another array containing overlapping objects is a very efficient operation.
In this case it will repeat the template that many times. For example:.Install the CLI by typing the following in a terminal. Now we have created a basic Vue CLI project called weather-json. Go into the folder by typing this in the command:. Open a new tab on your browser and enter this URL.
We will change this completely. This is a live reload server. This means that every change you do in the project, it will reflect those changes in the GUI. No need to waste valuable seconds refreshing the site manually :. We will work more on this shortly. We have only changed the code within the template tag and the script tag. In the template tag, we removed all the HTML within the div tag and replaced it with our Weather component.
In the script tag, we removed the HelloWorld component and replaced it with our Weather component. Copy the JSON content in a file called weather. Add the file into the root of the public folder of your project. Change the code in the script section in Weather. We have created a variable called weatherDataList. We will fill this variable with the data from the JSON file.
Then create a method called getWeatherData. This returns a promise and we are using the then function to handle the response.
How to Fetch data from an External JSON in VueJS
With the fetch API we need to call the json function which reads the response to the completion. This also returns a promise, so we need to chain a new then method to get the JSON data that we want. Even though we are fetching the data from a file, we do the exact same thing when fetching data from an URL. This is a click listener which will execute the getWeatherData when clicked.Oromo new music
We can then add the properties in the HTML by using the double bracket syntax. If you try to get the weather data now, you will notice that the app looks horrible.
We are using flexbox to lay out all the element in the page. Fetch has a few shortcomings. Like we demonstrated earlier with fetchwe needed to chain two then functions to the call the get the data.
At first I tried sending it in form data. This works but the problem is that max url parameter length is limited. The issue is that characters is not enough for my use case. You can't read a dynamic local file using a front end framework since the file won't exist if the code runs on another computer. But if the file you are trying to load is static and you won't be changing it periodically you can put it in the asset and load it using require.
Learn more. Vue - how to display local data [duplicate] Ask Question. Asked 6 days ago. Active 5 days ago. Viewed 53 times.
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Questions seeking debugging help " why isn't this code working? Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Reproducible example. Active Oldest Votes.We can use this component as a custom element inside a root Vue instance created with new Vue :.
Since components are reusable Vue instances, they accept the same options as new Vuesuch as datacomputedwatchmethodsand lifecycle hooks. The only exceptions are a few root-specific options like el. Notice that when clicking on the buttons, each one maintains its own, separate count. For example, you might have components for a header, sidebar, and content area, each typically containing other components for navigation links, blog posts, etc. To use these components in templates, they must be registered so that Vue knows about them.
There are two types of component registration: global and local. Earlier, we mentioned creating a component for blog posts. Props are custom attributes you can register on a component. When a value is passed to a prop attribute, it becomes a property on that component instance.
To pass a title to our blog post component, we can include it in the list of props this component accepts, using a props option:. If you try this in your template however, Vue will show an error, explaining that every component must have a single root element. You can fix this error by wrapping the template in a parent element, such as:. Defining a prop for each related piece of information could become very annoying:.
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:. When we click on the button, we need to communicate to the parent that it should enlarge the text of all posts.
Fortunately, Vue instances provide a custom events system to solve this problem. The parent can choose to listen to any event on the child component instance with v-onjust as we would with a native DOM event:. Custom events can also be used to create custom inputs that work with v-model. Remember that:. Keep in mind that this attribute can be used with regular HTML elements, however they will be treated as components, which means all attributes will be bound as DOM attributes.
For some properties such as value to work as you would expect, you will need to bind them using the. This will lead to issues when using components with elements that have such restrictions. For example:. Fortunately, the is special attribute offers a workaround:.Get the latest tutorials on SysAdmin and open source topics. Write for DigitalOcean You get paid, we donate to tech non-profits. DigitalOcean Meetups Find and meet other developers in your city. Become an author.
This makes it a good fit for small projects as well as sophisticated single-page applications when used with other tooling and libraries. An API, or Application Programming Interface, is a software intermediary that allows two applications to talk to each other. An API often exposes data that other developers can consume in their own apps, without worrying about databases or differences in programming languages.
See their licensing terms if you wish to use it in a commercial project. This is how Vue lets us declaritively render data in the UI. This code creates a new Vue app instance and attaches the instance to the element with the id of app. Vue calls this process mounting an application. We define a new Vue instance and configure it by passing a configuration object.
This object contains an el option which specifies the id of the element we want to mount this application on, and a data option which contains the data we want available to the view. This data will be displayed on our HTML page, or our viewin the place where we enclosed the key in double curly braces like this:. Open this file in your browser. First, change the data model:. Now save the file and reload it in your browser.
This new structure will let us reduce some duplication in our view. Open the index. This code uses the v-for directive which acts like a for-loop. It iterates over all the key-value pairs in our data model and displays the data for each one. This modification lets us add a new currency to the results data in vueApp. Add another mocked entry to the dataset to try this out:.
Use curl to make a request to the API to see the response:. This result looks exactly like the hard-coded data model you used in the previous step. All we have to do now is switch out the data by making a request to this URL from our app. The mounted function is called once the Vue app is mounted to an element.All Vue. Combined with the reactivity system, Vue is able to intelligently figure out the minimal number of components to re-render and apply the minimal amount of DOM manipulations when the app state changes.
The double mustaches interprets the data as plain text, not HTML. In order to output real HTML, you will need to use the v-html directive :. The contents of the span will be replaced with the value of the rawHtml property, interpreted as plain HTML - data bindings are ignored.
Note that you cannot use v-html to compose template partials, because Vue is not a string-based templating engine. Instead, components are preferred as the fundamental unit for UI reuse and composition.
Only use HTML interpolation on trusted content and never on user-provided content. Mustaches cannot be used inside HTML attributes. Instead, use a v-bind directive :.Dzsa launcher not downloading mods
Directives are special attributes with the v- prefix.API Driven Application with herpsabic.online, JSON-Server and Axios
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Create a data object where you have content as a key. On component created, you can assign it to the component's content value. Learn more. Asked 1 year, 10 months ago.
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