Tips for incorporating external functions into Vue Component data synchronization:

As someone new to JavaScript, I am trying to incorporate external functions into Vue component data bindings, but I am encountering issues.

helper.js

function groupArrayOfObjects(list, key) {  
    return blah blah
}

function parseDate(d) {      
    return bla bla
}

export { groupArrayOfObjects, parseDate };

vue component:

Vue warn]: Property or method "parseDate" is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property.

 <template>
          <div>{{parseDate(date) }}</div>  
    </template>

    import { groupArrayOfObjects, parseDate } from "@/assets/js/helper.js";
    export default {
        methods:{
          abc(){ groupArrayOfObjects(param1, param2);}
        }
    }

Answer №1

To enhance your code structure, consider organizing the helper functions within the methods option:

import * as helpers from "@/assets/js/helper.js";

export default {
  methods: {
    abc() { groupArrayOfObjects(param1, param2); },
    ...helpers
  }
}

Within the template section:

 <template>
   <div>{{parseDate(date) }}</div>  
 </template>

Answer №2

When it comes to using imported functions in your template, there is a trick you need to know. Since imported functions are not technically part of the component, you can't directly use them. To do so, you must add them to the method object of your component. This is similar to how you added the groupArrayOfObjects function.

import { groupArrayOfObjects, parseDate } from "@/assets/js/helper.js";

export default {
  methods: {
    abc() { groupArrayOfObjects(param1, param2); },
    
    // You can wrap your function like this
    foo(date) { parseDate(date) },
    
    // Or simply add it directly
    parseDate,
  }
}

Answer №3

If you want to utilize the parseDate function, you can import it from the helper file and make it available for the template design.

 <template>
  <div>{{ parseDate(date) }}</div>
</template>

<script>
import { parseDate } as helpers from "@/assets/js/helper.js";

export default {
  methods: {
    parseDate
  }
}
</script>

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