Numerous references embedded within a Vue.js component

Question

Numerous references embedded within a Vue.js component

I am currently working with multiple instances of a polygonCrop component in Vue.js, each one having a unique reference to a canvas property. These components are utilized in separate crop functions triggered by button clicks. My question is how to effectively use multiple refs with multiple components in Vue.js?

<polygonCrop 
    :canvasClass="'some-class'"
    :height="600"
    :imageSource="imgSrc"
    :showCanvas="show"
    :showPointer="showPointer"
    :width="800"
    ref="canvas"
></polygonCrop>
<polygonCrop 
    :canvasClass="'some-class'"
    :height="600"
    :imageSource="imgSrc1"
    :showCanvas="show"
    :showPointer="showPointer"
    :width="800"
    ref="canvas1"
></polygonCrop>
...
<b-button @click.prevent="crop" variant="success">Crop</b-button>
<b-button @click.prevent="crop1" variant="success">Crop</b-button>
...
crop: function () {
    this.$refs.canvas.crop();
    this.resultImage = this.$refs.canvas.resultImage;
    this.show = false;
    this.showResult = true;
},
crop1: function () {
    this.$refs.canvas1.crop();
    this.resultImage1 = this.$refs.canvas1.resultImage;
    this.show = false;
    this.showResult = true;
},

Although I am utilizing multiple canvases with references like canvas and canvas1, I'm unsure if this is the correct approach. Any guidance on this matter would be greatly appreciated.

javascript vue.js

Answer 1

Answer №1

If you have multiple elements with unique props for each element, it is not recommended to use this approach. Instead, consider creating an array containing multiple objects, with each object including the necessary data for that canvas. For example:

data(){
  return {
      canvases:[
        {
          class: 'class-name',
          imgSrc: 'image-source',
          width: 800,
          height: 600,
          ....
        },
        {
          class: 'class-name-2',
          imgSrc: 'image-source-2',
          width: 800,
          height: 600,
        }
         ....
      ]
  }
}

You can then loop through this array:

<!-- 5 elements -->
<polygonCrop 
             v-for="(canvas, i) in canvases"
             :key="i"
             :canvasClass="canvas.class"
             :height="canvas.height"
             :imageSource="canvas.imgSrc"
             :showCanvas="show(i)"
             :showPointer="showPointer"
             :width="800"
             :ref="'canvas-' + i"
></polygonCrop>

If you prefer to keep your current code structure, here is a solution for you

For the DOM, utilize a v-for loop with dynamic ref binding, and for the image sources, use a method to match the variables' names:

<!-- 5 elements -->
<polygonCrop :canvasClass="'some-class'"
             :height="600"
             :imageSource="getSource('imgSrc' + n)"
             :showCanvas="show"
             :showPointer="showPointer"
             :width="800"
             v-for="n in 5"
             :key="n"
             :ref="'canvas-' + n"
></polygonCrop>
<b-button @click.prevent="crop(n)" variant="success" v-for="n in 5">Crop {{n}}</b-button>

Utilize only one crop function, accepting a parameter:

// methods
crop: function (n) {
    const canvas = 'canvas-' + n 
    this.$refs[canvas].crop();
    this.resultImage = this.$refs[canvas].resultImage;
    this.show = false;
    this.showResult = true;
},
getSource : function(img) {
  return this[img]
}

Answer 2

If you have multiple elements with unique props for each element, it is not recommended to use this approach. Instead, consider creating an array containing multiple objects, with each object including the necessary data for that canvas. For example:

data(){
  return {
      canvases:[
        {
          class: 'class-name',
          imgSrc: 'image-source',
          width: 800,
          height: 600,
          ....
        },
        {
          class: 'class-name-2',
          imgSrc: 'image-source-2',
          width: 800,
          height: 600,
        }
         ....
      ]
  }
}

You can then loop through this array:

<!-- 5 elements -->
<polygonCrop 
             v-for="(canvas, i) in canvases"
             :key="i"
             :canvasClass="canvas.class"
             :height="canvas.height"
             :imageSource="canvas.imgSrc"
             :showCanvas="show(i)"
             :showPointer="showPointer"
             :width="800"
             :ref="'canvas-' + i"
></polygonCrop>

If you prefer to keep your current code structure, here is a solution for you

For the DOM, utilize a v-for loop with dynamic ref binding, and for the image sources, use a method to match the variables' names:

<!-- 5 elements -->
<polygonCrop :canvasClass="'some-class'"
             :height="600"
             :imageSource="getSource('imgSrc' + n)"
             :showCanvas="show"
             :showPointer="showPointer"
             :width="800"
             v-for="n in 5"
             :key="n"
             :ref="'canvas-' + n"
></polygonCrop>
<b-button @click.prevent="crop(n)" variant="success" v-for="n in 5">Crop {{n}}</b-button>

Utilize only one crop function, accepting a parameter:

// methods
crop: function (n) {
    const canvas = 'canvas-' + n 
    this.$refs[canvas].crop();
    this.resultImage = this.$refs[canvas].resultImage;
    this.show = false;
    this.showResult = true;
},
getSource : function(img) {
  return this[img]
}

Numerous references embedded within a Vue.js component

Answer №1

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