Is there a way to utilize the outcome of a method in multiple sections of the HTML code?

Working with Vue.js, I have a component that cleans up some content using a method and displays the results within HTML tags:

<template>
  ....
  <div v-for="(value) in mydata">
    <h2>{{ prettifyMyNumber(value) }}</h2>
  </div>
  ...
</template>

The current code for the method looks like this:

export default {
    // ...
    methods: {
        prettifyMyNumber(num) {
            // perform calculations
            return 23;
        }
    }
}

I now want to modify the method to separate the integer and float parts of the number so they can be displayed in different sections. The updated method will look like this:

    methods: {
        prettifyMyNumber(num) {
            // perform calculations
            return [numValue, floatValue];
        }
    }

To display each part separately, I could simply call the method twice within the template:

<template>
  ....
  <div v-for="(value) in mydata">
    <h2>{{ prettifyMyNumber(value)[0] }}</h2>
    <h3>{{ prettifyMyNumber(value)[1] }}</h3>
  </div>
  ...
</template>

However, this approach calls the method twice. Is there a way to store the result of the method somewhere and then use it to populate both h2 and h3 elements?

Answer №1

To create a new array from the existing data in mydata, one approach is to utilize a computed property and then incorporate it into your v-for loop:

export default {
    computed: {
        // This computed property processes `mydata` and generates an array of tuples
        prettifiedNumbers() {
            return this.mydata.map(data => this.prettifyMyNumber(data.value))
        }
    },
    methods: {
        prettifyMyNumber(num) {
            // Perform calculations here
            return [numValue, floatValue];
        }
    }
}

<template>
  ....
  <div v-for="entry in prettifiedNumbers">
    <h2>{{ entry[0] }}</h2>
    <h3>{{ entry[1] }}</h3>
  </div>
  ...
</template>

If you prefer keeping the original data structure of mydata, you can simply include a new property within each object:

export default {
    computed: {
        myTransformedData()) {
            return this.mydata.map(data => {
                // Append `prettifiedNumbers` tuple as a new key-value pair
                data.prettifiedNumbers = this.prettifyMyNumber[data.value];
                
                return data;
            });
        }
    },
    methods: {
        prettifyMyNumber(num) {
            // Execute necessary calculations
            return [numValue, floatValue];
        }
    }
}

<template>
  ....
  <div v-for="entry in myTransformedData">
    <h2>{{ entry.prettifiedNumbers[0] }}</h2>
    <h3>{{ entry.prettifiedNumbers[1] }}</h3>
  </div>
  ...
</template>

Answer №2

To achieve this, follow these simple steps:

<template v-for="value in mydata" >
   <div v-for="(num,index) in [prettifyMyNumber(value)]" :key="index">
      {{num[0]}}
      {{num[1]}}
  </div>
</template>

It's important to note that the template being used here is not the main template but an inner template. If this template is all you have, it might be beneficial to consider using a functional component instead.

Answer №3

Have you considered utilizing computed properties to take advantage of data caching?

computed: {
    initialSection() {
        return prettifyMyNumber(value)[0];
    },
    additionalSection() {
        return prettifyMyNumber(value)[1];
    }
}

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