What's the optimal method for implementing a Windows-style selection mode in JavaScript?

Question

What's the optimal method for implementing a Windows-style selection mode in JavaScript?

In Windows, you have the ability to select a folder by clicking on it once.

Currently, I am using Vuejs. I am interested in coding the same functionality with multiple arrays retrieved from my database and displayed using v-for.

My idea is to add a new column (select) to each array with a default value of 0. Then, I can implement a function that changes the select value to 1 when clicked, as well as apply a CSS class for visual distinction (such as blue border color).

At present, the element with the select column value of 1 is considered selected.

The process becomes more complex when trying to change the selection (i.e., selecting another array). I would need to first set all select columns' values to 0, remove any applied CSS classes, and then proceed with the new operation (as only one element should be selected at a time).

Any advice on how to achieve this? Thank you.

javascript vue.js

Answer 1

Answer №1

To implement this functionality with Vue.js, you just need to ensure your ViewModel is set up correctly. Your template should look like this:

<div>
  <!-- Pay attention to the dynamic :class bindings -->
  <div v-for="folder in list" class="folder-item" :key="folder.id"
    @click="onClick(folder)"
    :class="{ 'folder-item__active': folder === selected }">
      <span>{{ folder.folderName }}</span>
  </div>
</div>

In your component's JavaScript code, make sure to include:

Vue.extend({

  data() {
    return {
      // Initial list of folders
      list: [
        { folderName: 'Folder 1', id: 1 /* Some more data */ },
        { folderName: 'Folder 2', id: 1 /* Some more data */ },
      ],

      // Set selected to null for Vue.js reactivity tracking
      selected: null
    };
  },

  mounted() {

    // Update the folder list later on
    setTimeout(() => {
      this.list = [/* Updated list */]
      this.selected = null;
    }, 3000);
  },

  methods: {
    onClick(selectedItem) {
      this.selected = selectedItem;
    }
  }
});

There are three key points to note:

Utilize dynamic :class bindings.
Use the @click event handler to manage the selected folder.
Whenever the list changes, reset the selected value to null. (Detecting changes by comparing references internally is straightforward and efficient.)

If your list frequently changes due to immutable data, adjust the logic based on a unique identifier:

<!-- Vue binding -->
:class="{ 'folder-item__active': folder.id === selected && selected.id }"

Answer 2

To implement this functionality with Vue.js, you just need to ensure your ViewModel is set up correctly. Your template should look like this:

<div>
  <!-- Pay attention to the dynamic :class bindings -->
  <div v-for="folder in list" class="folder-item" :key="folder.id"
    @click="onClick(folder)"
    :class="{ 'folder-item__active': folder === selected }">
      <span>{{ folder.folderName }}</span>
  </div>
</div>

In your component's JavaScript code, make sure to include:

Vue.extend({

  data() {
    return {
      // Initial list of folders
      list: [
        { folderName: 'Folder 1', id: 1 /* Some more data */ },
        { folderName: 'Folder 2', id: 1 /* Some more data */ },
      ],

      // Set selected to null for Vue.js reactivity tracking
      selected: null
    };
  },

  mounted() {

    // Update the folder list later on
    setTimeout(() => {
      this.list = [/* Updated list */]
      this.selected = null;
    }, 3000);
  },

  methods: {
    onClick(selectedItem) {
      this.selected = selectedItem;
    }
  }
});

There are three key points to note:

Utilize dynamic :class bindings.
Use the @click event handler to manage the selected folder.
Whenever the list changes, reset the selected value to null. (Detecting changes by comparing references internally is straightforward and efficient.)

If your list frequently changes due to immutable data, adjust the logic based on a unique identifier:

<!-- Vue binding -->
:class="{ 'folder-item__active': folder.id === selected && selected.id }"

What's the optimal method for implementing a Windows-style selection mode in JavaScript?

Answer №1

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