Category: Vue Answers

Sometimes, we want to fix the ‘vue-language-server : Elements in iteration expect to have ‘v-bind:key’ directives’ warning in Vue.js.

In this article, we’ll look at how to fix the ‘vue-language-server : Elements in iteration expect to have ‘v-bind:key’ directives’ warning in Vue.js.

How to fix the ‘vue-language-server : Elements in iteration expect to have ‘v-bind:key’ directives’ warning in Vue.js?

To fix the ‘vue-language-server : Elements in iteration expect to have ‘v-bind:key’ directives’ warning in Vue.js, we should add the key prop to the component we’re using v-for on.

For instance, we write

<template>
  <div>
    <div v-for="(item, index) in items" :key="item.id">
      {{ index }}. {{ item.name }}
    </div>
  </div>
</template>

to add the key prop and set it to a unique ID value.

The ID value will help Vue distinguish between each item being rendered with v-for.

Conclusion

To fix the ‘vue-language-server : Elements in iteration expect to have ‘v-bind:key’ directives’ warning in Vue.js, we should add the key prop to the component we’re using v-for on.

Sometimes, we want to fix the ‘did you register the component correctly? For recursive components, make sure to provide the "name" option’ error in Vue.js.

In this article, we’ll look at how to fix the ‘did you register the component correctly? For recursive components, make sure to provide the "name" option’ error in Vue.js.

How to fix the ‘did you register the component correctly? For recursive components, make sure to provide the "name" option’ error in Vue.js?

To fix the ‘did you register the component correctly? For recursive components, make sure to provide the "name" option’ error in Vue.js, we should register the components we reference in our template.

For instance, we write

<script>
//...
export default {
  //...
  components: {
    "i-tabs": Tabs,
    "i-tab-pane": TabPane,
  },
  //...
};
</script>

to register the i-tabs and i-tab-pane component where Tabs and TabPane are components.

Then we can use i-tabs and i-tab-pane in our template without errors.

Conclusion

To fix the ‘did you register the component correctly? For recursive components, make sure to provide the "name" option’ error in Vue.js, we should register the components we reference in our template.

To download a PDF file with Vue.js, we can create an object URL from the PDF blob response, assign the URL as the value of the href property of an anchor element.

And them we call anchor’s click method to download it.

For instance, we write

<script>
//...
export default {
  //...
  methods: {
    async downloadFile() {
      const response = await this.$http.get("/test.pdf", {
        responseType: "arraybuffer",
      });
      const blob = new Blob([response.data], { type: "application/pdf" });
      const link = document.createElement("a");
      link.href = window.URL.createObjectURL(blob);
      link.download = "test.pdf";
      link.click();
    },
  },
  //...
};
</script>

to call $http.get with the PDF URL where $http.get is the Axios get method.

We set responseType to 'arraybuffer' to download the response as an array buffer.

Next, we convert the response to a blob with the Blob constructor.

Then we create a link with createElement.

Then we set its href property to the object URL created from createObjectURL called with blob.

And then we set link.download to the file name of the downloaded file.

Finally, we call click to download it.

Sometimes, we want to extend another Vue.js component in a single-file component.

In this article, we’ll look at how to extend another Vue.js component in a single-file component.

How to extend another Vue.js component in a single-file component?

To extend another Vue.js component in a single-file component, we can use Vue.extend on the base component.

And then we can extend the base component by calling extend on the base component.

For instance, we write

Foo.vue

<script>
import Vue from "vue";

export default Vue.extend({
  //...
});
</script>

to call Vue.extend with the component options object and export it.

And then we can extend the Foo.vue component by writing

<script>
import Foo from "./Foo";

export default Foo.extend({
  //...
});
</script>

to call Foo.extend with the component object definition to extend the Foo component.

Conclusion

To extend another Vue.js component in a single-file component, we can use Vue.extend on the base component.

And then we can extend the base component by calling extend on the base component.

Sometimes, we want to link to an external website with Vue.js and Vue Router.

In this article, we’ll look at how to link to an external website with Vue.js and Vue Router.

How to link to an external website with Vue.js and Vue Router?

To link to an external website with Vue.js and Vue Router, we can just use a regular anchor element.

For instance, we write

<template>
  <div>
    <a :href="websiteUrl" target="_blank">
      {{ url }}
    </a>
  </div>
</template>

to set the href prop to websiteUrl where websiteUrl is an external URL.

We set target to _blank to open a new tab when we click on the link.

Conclusion

To link to an external website with Vue.js and Vue Router, we can just use a regular anchor element.