Utilizing Vue.js methods within a v-for loop

Is there a way to execute a method inside a v-for loop in my Vue component? Take a look at this example:

<div v-for="(item,index) in list">
      <p>{{myCustomMethod(item,index)}}</p>
</div>

However, when I try to run the method, the paragraph tag ends up being empty. Here is the method along with an axios call:

 myCustomMethod: function(item, index) {
    axios.get('/fetchData')
    .then((response)=> {
        alert(response.data);
        return response.data;

    })
    .catch(function (error) {
        console.error(error);
    });
   },
 }

Interestingly, when I use

alert( SomethingWithItemAndIndex)
, the expected output is displayed in the browser. But as soon as I remove the axios call, the method seems to work just fine.

Any suggestions or tips would be greatly appreciated. Thank you!

Answer №1

It is not recommended to use the myMethod within a v-for loop.

Axios operates asynchronously.

Consider separating the logic of myMethod with bar into a different method and store the data in newbar, which can then be rendered.


 <div v-for="(foo, index) in dataBar">
  <p>{{otherSimpleMethod(foo, index)}}</p>
 </div>

  1. Add dataBar to your data object
  2. Refactor myMethod to work with the variable bar in a separate method called newMethod
  3. Update dataBar (the Axios response) within the newMethod
  4. Call newMethod within the mounted lifecycle hook (assumed to be after page load)

Alternatively, you can explore using nextTick.

By the way, should the title be changed from Vue.js Use mounted in v-for to perhaps Vue.js Use method in v-for?

Answer №2

Your code seems to have an issue as you missed adding a quote in it.

<div v-for="(foo,index) in bar">
      <p>{{myMethod(foo,index)}}</p>
</div>

To view a solution, please visit the following jsbin link: http://jsbin.com/wovavut/edit?html,js,output

Answer №3

In my opinion, it is not recommended to directly use a method within the v-for directive. It is better to create a computed property that can apply your method to the original array of items stored in the data property:

Check out Vue.js 2: Computed Properties

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