Category: Vue

Sometimes, we want to fix the "You are binding v-model directly to a v-for iteration alias" error in Vue.js.

In this article, we’ll look at how to fix the "You are binding v-model directly to a v-for iteration alias" error in Vue.js.

How to fix the "You are binding v-model directly to a v-for iteration alias" error in Vue.js?

To fix the "You are binding v-model directly to a v-for iteration alias" error in Vue.js, we should make sure that we don’t use iteration variables we defined in v-for as values for v-model.

For instance, we write

<template>
  <table id="app">
    <tr v-for="(run, index) in settings.runs">
      <td>
        <input
          type="text"
          :name="`run${index}`"
          v-model="settings.runs[index]"
        />
      </td>
      <td>
        <button @click.prevent="removeRun(index)">X</button>
      </td>
      <td>{{ run }}</td>
    </tr>
  </table>
</template>

to loop through settings.runs with v-for and render inputs for each entry.

We set v-model to settings.run[index] instead of run to let us set the settings.runs array entry values without the "You are binding v-model directly to a v-for iteration alias" being thrown.

Conclusion

To fix the "You are binding v-model directly to a v-for iteration alias" error in Vue.js, we should make sure that we don’t use iteration variables we defined in v-for as values for v-model.

Sometimes, we want to fix conflict between templates of Twig and Vue.js.

In this article, we’ll look at how to fix conflict between templates of Twig and Vue.js.

How to fix conflict between templates of Twig and Vue.js?

To fix conflict between templates of Twig and Vue.js, we can change the delimiters when we’re creating the Vue instance.

For instance, we write

new Vue({ delimiters: ['${', '}'] })

to set the template variable delimiters to be different from the default double curly braces in Vue 2.

In Vue 3, we write

Vue.createApp({ delimiters: ['${', '}'] })

to set the template variable delimiters to be different from the default double curly braces with Vue.createApp.

Conclusion

To fix conflict between templates of Twig and Vue.js, we can change the delimiters when we’re creating the Vue instance.

Sometimes, we want to remount a component in Vue.js.

In this article, we’ll look at how to remount a component in Vue.js.

How to remount a component in Vue.js?

To remount a component in Vue.js, we should change the key prop of the component.

For instance, we write

<template>
  <div id="app">
    <my-component :key="componentKey"></my-component>
    <button @click="componentKey = !componentKey">reload</button>
  </div>
</template>

to set the key prop of my-component to componentKey.

And then we add a button to toggle the componentKey between true and false.

As a result, my-component will remount when we change the value of componentKey by clicking the button.

Conclusion

To remount a component in Vue.js, we should change the key prop of the component.

Sometimes, we want to limit iteration of elements in v-for with Vue.js.

In this article, we’ll look at how to limit iteration of elements in v-for with Vue.js.

How to limit iteration of elements in v-for with Vue.js?

To limit iteration of elements in v-for with Vue.js, we can use the JavaScript array slice method.

For instance, we write

<template>
  <div>
    <div v-if="showLess">
      <div v-for="value in array.slice(0, 5)" :key="value.id"></div>
    </div>
    <div v-else>
      <div v-for="value in array" :key="value.id"></div>
    </div>
    <button @click="showLess = false"></button>
  </div>
</template>

to call array.slice with indexes 0 and 5 to return an array with array elements from index 0 to 4.

And then we loop through the returned array with v-for.

How to limit iteration of elements in v-for with Vue.js?

To limit iteration of elements in v-for with Vue.js, we can use the JavaScript array slice method.

Sometimes, we want to toggle class on click with Vue.js.

In this article, we’ll look at how to toggle class on click with Vue.js.

How to toggle class on click with Vue.js?

To toggle class on click with Vue.js, we can set the class prop to an image with the class name as the property name and the condition to enable the class as the value.

For instance, we write

<template>
  <div
    :class="{ active: showMobileMenu }"
    @click="showMobileMenu = !showMobileMenu"
  >
    click me
  </div>
</template>

to set the active property to showMobileMenu to apply the active class if showMobileMenu is true.

And we set @click to showMobileMenu to its negation to toggle showMobileMenu.

As a result, when we click on the div, the active class would be toggled on and off.

Conclusion

To toggle class on click with Vue.js, we can set the class prop to an image with the class name as the property name and the condition to enable the class as the value.