Vue: The computed property cannot be set

Question

Vue: The computed property cannot be set

I'm having trouble with utilizing computed properties and ajax calls in Vue.js.

The "filterFactories" variable stores a list of factories. A computed property named "filterFactories" generates this list of factories.

Now, I am looking to implement a new functionality: There is a button that triggers an ajax request to fetch additional factories. I want to update the computed property "filterFactories" after the ajax request is successful. However, the update does not happen as expected. Neither of the following methods make any difference: 1. Setting this.filterFactories = response; 2. Setting window.filterFactories = response; Both approaches do not update the property.

Is there a way to refresh the "filterFactories" variable after a successful ajax call?

The following is a snippet of the larger code I'm working with:

<!-- Add your code snippet here -->

javascript vue.js vuejs2 computed-properties

Answer 1

Answer №1

When working with Vue, computed properties can sometimes feel like magic. Vue scans the function code and automatically creates watchers for the properties it detects within the code. While this approach is effective in simpler scenarios, it can fall short when dealing with loops, map, reduce, and so on.

To address this issue, I have developed several workarounds, but one of the simplest and most straightforward methods involves creating an artificial property that you reference in the computed property and then update as necessary:

new Vue({
    data: {
        updated: 0,
    },
    computed: {
        myComputed(): {
            // ...
            // simply reference the artificial property
            this.updated;
        },
    },
    methods: {
        myAjax(): {
            // ...
            // modifying the artificial property triggers an update of myComputed
            this.updated++;
        },
    },
});

It's important to choose names that accurately reflect the specific use cases you're dealing with, although I've found instances where simply naming this property "updateDummy" suffices ;)

Answer 2

When working with Vue, computed properties can sometimes feel like magic. Vue scans the function code and automatically creates watchers for the properties it detects within the code. While this approach is effective in simpler scenarios, it can fall short when dealing with loops, map, reduce, and so on.

To address this issue, I have developed several workarounds, but one of the simplest and most straightforward methods involves creating an artificial property that you reference in the computed property and then update as necessary:

new Vue({
    data: {
        updated: 0,
    },
    computed: {
        myComputed(): {
            // ...
            // simply reference the artificial property
            this.updated;
        },
    },
    methods: {
        myAjax(): {
            // ...
            // modifying the artificial property triggers an update of myComputed
            this.updated++;
        },
    },
});

It's important to choose names that accurately reflect the specific use cases you're dealing with, although I've found instances where simply naming this property "updateDummy" suffices ;)

Vue: The computed property cannot be set

Answer №1

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