Effortless expansion of textarea following data insertion in Vue

Question

Effortless expansion of textarea following data insertion in Vue

In my Vue project, I am fetching a JSON array from an API and displaying its content in a list of textareas using v-for.

Whenever a user focuses on a textarea or edits the text within it, I want the textarea to automatically resize to fit the content.

<div v-for="post in posts">
<textarea v-model="post.body" rows="1" @focus="resizeTextarea" @keyup="resizeTextarea"></textarea>
</div>

resizeTextarea(e) {
  let area = e.target;
  area.style.overflow = 'hidden';
  area.style.height = area.scrollHeight + 'px';
}

Despite my limited knowledge of Vue, I have been struggling to find a way to automatically resize all textareas after loading data from the API since there is no @load event for textareas.

I attempted to achieve this by using a watcher on the data, but it seems like a lengthy workaround.

Does anyone have a more efficient solution? Thank you!

Visit this link for reference.

javascript vue.js asynchronous resize textarea

Answer 1

Answer №1

If you're looking to dynamically resize a textarea element in your Vue component, one approach is to create a separate component specifically for managing the resizing logic. Here's an example that demonstrates this using single-file components:

// DynamicTextarea.vue
<template>
  <textarea
    v-model="value"
    ref="textarea"
    rows="1"
    @focus="resize"
    @keyup="resize"
  >
  </textarea>
</template>

<script>
  export default {
    props: {
      value: {
        type: String,
        required: true,
      }
    },
    mounted() {
      this.resize();
    },
    methods: {
      resize() {
        const { textarea } = this.$refs;
        textarea.style.height = `${textarea.scrollHeight - 4}px`;
      }
    }
  }
</script>

In the parent component template:

<template>
  <div v-for="post in posts">
    <DynamicTextarea v-model="post.body" />
  </div>
</template>

<script>
  import DynamicTextarea from './DynamicTextarea.vue';

  export default {
    components: {
      DynamicTextarea,
    }
    // Other script content
  }
</script>

Please note: If you are working with Vue 3, ensure that you replace value with modelValue in the child component.

Another option is to utilize a watch method as an alternative solution. Here is an example of how you could implement this:

watch: {
  posts() {
    // Ensure the view updates before applying changes
    this.$nextTick(() => {
      [...document.querySelectorAll('textarea')].forEach(textarea => {
        this.resizeTextarea({ target: textarea });
      });
    });
  }
}

Answer 2

If you're looking to dynamically resize a textarea element in your Vue component, one approach is to create a separate component specifically for managing the resizing logic. Here's an example that demonstrates this using single-file components:

// DynamicTextarea.vue
<template>
  <textarea
    v-model="value"
    ref="textarea"
    rows="1"
    @focus="resize"
    @keyup="resize"
  >
  </textarea>
</template>

<script>
  export default {
    props: {
      value: {
        type: String,
        required: true,
      }
    },
    mounted() {
      this.resize();
    },
    methods: {
      resize() {
        const { textarea } = this.$refs;
        textarea.style.height = `${textarea.scrollHeight - 4}px`;
      }
    }
  }
</script>

In the parent component template:

<template>
  <div v-for="post in posts">
    <DynamicTextarea v-model="post.body" />
  </div>
</template>

<script>
  import DynamicTextarea from './DynamicTextarea.vue';

  export default {
    components: {
      DynamicTextarea,
    }
    // Other script content
  }
</script>

Please note: If you are working with Vue 3, ensure that you replace value with modelValue in the child component.

Another option is to utilize a watch method as an alternative solution. Here is an example of how you could implement this:

watch: {
  posts() {
    // Ensure the view updates before applying changes
    this.$nextTick(() => {
      [...document.querySelectorAll('textarea')].forEach(textarea => {
        this.resizeTextarea({ target: textarea });
      });
    });
  }
}

Answer 3

Answer №2

If you want to enhance the functionality, consider utilizing the ref attribute:

<div id="app">
    <div v-for="post in posts" ref="container">
        <textarea v-model="post.body" rows="1" @focus="resizeTextarea" @keyup="resizeTextarea" ></textarea>
    </div>
</div>

To complete this setup, don't forget to insert the following code snippet at the end of the mounted() method:

this.$nextTick(() => {
    this.$refs.container.forEach(ta => {
        ta.firstChild.dispatchEvent(new Event("keyup"));
    });
});

Answer 4

If you want to enhance the functionality, consider utilizing the ref attribute:

<div id="app">
    <div v-for="post in posts" ref="container">
        <textarea v-model="post.body" rows="1" @focus="resizeTextarea" @keyup="resizeTextarea" ></textarea>
    </div>
</div>

To complete this setup, don't forget to insert the following code snippet at the end of the mounted() method:

this.$nextTick(() => {
    this.$refs.container.forEach(ta => {
        ta.firstChild.dispatchEvent(new Event("keyup"));
    });
});

Effortless expansion of textarea following data insertion in Vue

Answer №1

Answer №2

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