I have 2 buttons which when clicked should filter by novelty
or offer
, I am able to make it so that when novelty is clicked it will filter by this but I am unable to make it so that if both are click it will filter by both novelty
and offer
How can I make it so that when both novelty and offer are clicked it will filter by both of these?
https://www.webpackbin.com/bins/-KpVGNEN7ZuKAFODxuER
import React from 'react'
export default class extends React.Component {
constructor() {
super()
this.state = {
products: [
{ id: 1, novelty: true, offer: false, name: 'test1' },
{ id: 2, novelty: true, offer: true, name: 'test2' },
{ id: 3, novelty: false, offer: true, name: 'test3' }
],
display: 'all',
filters: [
{novelty:'true'},
{offer: 'true'}
]
}
}
setCategory (category) {
this.setState({
display: category
});
}
render() {
return(
<div>
<button onClick={()=>this.setCategory(true)}>Akce</button>
<button onClick={()=>this.setCategory(true)}>Offer</button>
{
this.state.products.filter( product =>
products.offer === this.state.display ||
this.state.display==='all')
.map(product =>
<div>{product.name}</div>
)
}
</div>
)
}
}
Here is the final version I've come up with:
import React from 'react'
export default class extends React.Component {
constructor() {
super()
this.state = {
products: [
{ id: 1, novelty: true, offer: false, name: 'test1' },
{ id: 2, novelty: true, offer: true, name: 'test2' },
{ id: 3, novelty: false, offer: true, name: 'test3' }
],
filters: {
novelty: true,
offer: true
}
}
}
setCategory (category) {
this.setState((state) => ({
filters: Object.assign({}, state.filters, { [category]: !state.filters[category] })
}));
}
render() {
console.log(this.state.filters)
return(
<div>
<button onClick={()=>this.setCategory('novelty')}>Akce</button>
<button onClick={()=>this.setCategory('offer')}>Offer</button>
{ this.state.products
.filter(product => product.novelty === this.state.filters.novelty || product.offer === this.state.filters.offer)
.map(product =>
<div key={product.id}>{product.name}</div>
)}
</div>
)
}
}
https://www.webpackbin.com/bins/-KpVHqfkjeraq6pGvHij
A few things:
true
instead of 'true'
). display: 'all'
isn't required for your use case. You can compute this value from your filters if you need to. setCategory
receive which category
you want to set as a param. setCategory
to setFilter
Also, I'm using the asycnhronous version of setState
. This allows you to hand in a function.
this.setState((state) => ({
filters: Object.assign({}, state.filters, { [category]: !state.filters[category] })
}));
Here I'm using Object.assign
to create a new Object. I populate him with state.filters
and finally I update the filter you want to. category
will either be novelty
or offer
and thanks to that I'm using the shorthand version of [category]
.
To conclude, I also update your filter
function to check the product.novelty
against the filter.novelty
or the product.offer
with the filter.offer
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