I'm currently working in a page with parent/child components. Somehow my child component gets updated when I manage its variables in the parent component. What I'm trying to do:
@change to the parent component@change event contains all the data I need, but not in the format I wantsubmit() that gets this data and modify the one of the arrays so that this: ['foo','bar'] becomes this 'foo,bar'The child component inside the parent component
<configuracoes :configuracoes="configuracoes" @change="setData"
v-if="currentPage === 'configs'"/>
The change event emitted by the child component
this.$emit("change", this.site);
The important part of 'site' var
site: {
seo: {
keywords: [],
...
},
...
},
The setData() function
setData(data) {
this.data = data;
},
The submitData() function
submitData() {
if (this.currentPage === "configs") {
let data = ({}, Object.assign(this.data))
let keywords = data.seo.keywords.join(',')
data.seo.keywords = keywords
this.$store.dispatch("sites/updateSite", {
empresa_id: this.user.empresa_id,
site_id: this.siteId,
dados: data,
});
}
}
As you can see, I'm declaring another variable let data to avoid updating this.site variable, but no success
First of all, there is an issue with how you're "copying" your this.data object.
let data = ({}, Object.assign(this.data)); // this doesn't work
console.log(data === this.data); // true
const dataCopy = Object.assign({}, this.data); // this works
console.log(dataCopy === this.data); // false
The way Object.assign works, all the properties will be copied over into the first argument. Since you only pass a single argument, it doesn't change and is still pointing to the same old object.
If you use the correct way, you will most likely still run into the same issue. The reason is that data.seo is not a primitive value (a number or a string), but is an object.
This means that the whole seo object will be copied over into the new copy. In other words, even though dataCopy !== this.data, dataCopy.seo === this.data.seo. This is known as "shallow copy".
You want to make sure you DO NOT modify the original seo object, here are a few ways to do that.
let goodCopy;
const newKeywords = this.data.seo.keywords.join(',');
// use object spread syntax
goodCopy = {
...this.data,
seo: {
...this.data.seo,
keywords: newKeywords,
},
};
// use Object.assign
goodCopy = Object.assign(
{},
this.data,
{
seo: Object.assign(
{},
this.data.seo,
{keywords: newKeywords}),
});
// create a copy of "seo", and then change it to your liking
const seoCopy = {...this.data.seo};
seoCopy.keywords = newKeywords;
goodCopy = Object.assign({}, this.data, {seo: seoCopy});
this.$store.dispatch('sites/updateSite', {
empresa_id: this.user.empresa_id,
site_id: this.siteId,
dados: goodCopy,
});
If you want to read up on ways to copy a JavaScript object, here's a good question.
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments