Category: Vue

Sometimes, we want to fix the "’v-slot’ directive doesn’t support any modifier" ESLint error in Vue.js.

In this article, we’ll look at how to fix the "’v-slot’ directive doesn’t support any modifier" ESLint error in Vue.js.

How to fix the "’v-slot’ directive doesn’t support any modifier" ESLint error in Vue.js?

To fix the "’v-slot’ directive doesn’t support any modifier" ESLint error in Vue.js, we wrap our slot name with periods in the name with backticks.

For instance, we write

<template>
  <template v-slot:[`item.actions`]="{ item }"> ... </template>
</template>

to add the item.actions slot with v-slot:[item.actions] to avoid having the "’v-slot’ directive doesn’t support any modifier" being thrown when we use ESLint in our Vue CLI project.

Conclusion

To fix the "’v-slot’ directive doesn’t support any modifier" ESLint error in Vue.js, we wrap our slot name with periods in the name with backticks.

Sometimes, we want to create a Vuex getter that takes an argument.

In this article, we’ll look at how to create a Vuex getter that takes an argument.

How to create a Vuex getter that takes an argument?

To create a Vuex getter that takes an argument, we can return a function in our getter function.

For instance, we write

const store = new Vuex.Store({
  getters: {
    someMethod: (state) => (id) => {
      return state.things.find((thing) => thing.id === id);
    },
  },
});

to return a function in the someMethod getter by setting someMethod to a function that returns a function that returns an object.

Then we can call someMethod with the id parameter in our components with

store.getters.someMethod(2)

Conclusion

To create a Vuex getter that takes an argument, we can return a function in our getter function.

Sometimes, we want to mock window.location.href with Jest and Vue.js.

In this article, we’ll look at how to mock window.location.href with Jest and Vue.js.

How to mock window.location.href with Jest and Vue.js?

To mock window.location.href with Jest and Vue.js, we can mock the window.location property with our own values.

For instance, we write

global.window = Object.create(window);
const url = "https://example.com";
Object.defineProperty(window, "location", {
  value: {
    href: url,
  },
});
expect(window.location.href).toEqual(url);

to call Object.defineProperty with window and 'location' and an object with the value.href property to set window.location.href‘s value to the url.

We make a copy of window and assign it to global.window with

global.window = Object.create(window)

Conclusion

To mock window.location.href with Jest and Vue.js, we can mock the window.location property with our own values.

Sometimes, we want to fix the unknown custom element error with Vue.js.

In this article, we’ll look at how to fix the unknown custom element error with Vue.js.

How to fix the unknown custom element error with Vue.js?

To fix the unknown custom element error with Vue.js, we need to register the components we use in our component.

For instance, we write

<template>
  <my-task></my-task>
</template>

<script>
//...

export default {
  //...
  components: {
    MyTask,
  },
  //...
};
</script>

to register the MyTask component with

components: {
  MyTask,
},

Then we can use the MyTask component with

<my-task></my-task>

Conclusion

To fix the unknown custom element error with Vue.js, we need to register the components we use in our component.

Sometimes, we want to use props in CSS with In Vue.js.

In this article, we’ll look at how to use props in CSS with In Vue.js.

How to use props in CSS with In Vue.js?

To use props in CSS with In Vue.js, we can set the style prop to an object with prop values as CSS style values.

For instance, we write

<template>
  <div :style="style" @mouseover="mouseOver()"></div>
</template>

<script>
export default {
  props: ["color"],
  computed: {
    style() {
      return { "background-color": this.hovering ? this.color : "red" };
    },
  },
  data() {
    return {
      hovering: false,
    };
  },
  methods: {
    mouseOver() {
      this.hovering = !this.hovering;
    },
  },
};
</script>

to create the style computed property to return an object with background-color set to the this.color prop value if this.hovering is true.

Otherwise, we set it to 'red'.

And then we set the style prop to style to apply the styles with

:style="style"

We register the color prop

props: ["color"]

Conclusion

To use props in CSS with In Vue.js, we can set the style prop to an object with prop values as CSS style values.