Fix “elements in interation expect to have ‘v-bind:key'” in Vue
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To fix the “elements in iteration expect to have ‘v-bind:key’ error” in Vue, you need to set a unique v-bind:key, or :key for short, on the v-for element.
The :key should be a JavaScript primitive, like a string or a number.
<div v-for="item in items" v-bind:key="item.id">
<li>{{item}}</li>
</div>We recommend using a unique identifier, like a Mongoose ObjectId or uuid, as the :key if you are iterating over an array of objects.
Using the Array Index as the Key
You can also use the array index as the key if you do not have a good unique identifier.
<div v-for="(item, index) in items" v-bind:key="index">
<li>{{item}}</li>
</div>However, if you use the array index as the key, be careful if you use a component that relies on internal state in v-for.
For example, below the second list is incorrect.
The internalValue doesn’t line up with value after you click addValueToMiddle because Vue won’t re-render existing item components when the items array changes.
Vue.component('item', {
props: ['value'],
data() {
return {
internalValue: this.value
};
},
template: '<li>Internal: {{internalValue}} Prop: {{value}}</li>'
});
const app = new Vue({
data: () => ({ items: [1, 2, 3, 4, 5] }),
template: '
<div>
<button @click="addValueToMiddle">Add value to middle</button>
<ul>
<item v-for="(i, index) in items" :value="i" :key="index"></item>
</ul>
</div>
',
methods: {
addValueToMiddle() {
this.items.splice(Math.ceil(this.items.length / 2), 0, this.items.length + 1)
}
}
});Vue.js is a progressive JavaScript framework that makes building user interfaces simple and enjoyable. Vue is designed from the ground up to be incrementally adoptable, so you can use the features you need, and mix and match Vue with other libraries or frameworks.
Vue is a relatively new framework, but it has quickly become one of the most popular JavaScript frameworks in the world. It is used by large companies like Alibaba, Baidu, and Xiaomi, as well as by thousands of smaller businesses and startups.
Here are some of the features that make Vue.js so popular:
- Declarative rendering: Vue uses a declarative rendering model, which means that you can describe the desired output of your application in terms of HTML, CSS, and JavaScript. This makes it easy to reason about your code and to make changes to your application.
- Reactivity: Vue is a reactive framework, which means that it automatically updates the DOM whenever there is a change to the application’s state. This makes your application feel fast and responsive.
- Composition: Vue is a component-based framework, which means that you can build your application out of reusable components. This makes your code more maintainable and easier to test.
- Performance: Vue is a highly performant framework. It has been benchmarked against other popular JavaScript frameworks, and it has consistently outperformed them.
If you are looking for a JavaScript framework that is easy to learn, powerful, and performant, then Vue.js is a great choice.
Here are some of the things you can do with Vue.js:
- Build single-page applications
- Create user interfaces for web, mobile, and desktop applications
- Integrate with other JavaScript frameworks and libraries
- Build custom components
- Create reusable code
- Test your code
If you are interested in learning more about Vue.js, there are a number of resources available online. The official Vue.js website has a comprehensive documentation and a number of tutorials. There are also a number of third-party websites and blogs that offer tutorials, articles, and other resources about Vue.js.
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