Mutating properties in VueJs

When I attempted to move a section for filtering from the parent component to a child component, I encountered this error message: "Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: filter". Even though the template is rendering, typing in the input field triggers this error.

In Child

<b-form-input
         v-model="filter"
         type="search"
         id="filterInput"
         placeholder="Type to Search"
    ></b-form-input>
<b-button :disabled="!filter" @click="filter = ''">Clear</b-button>

export default {
    name:'ExampleSearch',
    props:['filter'],

}

In Parent

   <ExampleSearch></ExampleSearch>

    <b-table
            ...code....
            :fields="fields"
            ...code....
    >

getExample(context) {
   ..code..
   if (typeof context !== 'undefined' && context.filter) {
         url += `&filter=${context.filter}`;
   }
   ..code..
}

Answer №1

The click event on

<b-button :disabled="!filter" @click="filter = ''">Clear</b-button>
is changing the value of the filter prop directly from the child component to the parent, causing this error.

To prevent this issue, you can update the click event listener as shown below, where you use $emit to send the event to the parent:

...
<b-button :disabled="!filter" @click="$emit('clearFilter')">Clear</b-button>
...

Then in the parent component, you can listen for this event like this:

...
<ExampleSearch :filter="filter" @clearFilter="filter=''" ></ExampleSearch>
...

If you are using Vue 2.3.0, you have the option to use the .sync modifier, which is a shortcut for the above approach. Learn more about it here

Answer №2

To prevent that error, make sure to assign your props to a data property.

data() {
 return {
  updatedFilter: this.filterData
 }
}

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