我在REACT js购物申请。我使用.map()函数显示所有产品,并在每个产品前面显示“ADD to CART”按钮。单击ADD to Cart btn时,它会将单击的产品ID添加到本地存储中,然后通过从localStorage检索ID,在Shopping Cart中显示这些选定的产品。一切正常。
现在我想要的是当它点击一次时禁用“添加到购物车”按钮(仅适用于所选产品)。我是通过设置状态来实现的,但它实际上禁用所有“ADD to Cart”按钮,而不是仅禁用所选按钮。
我搜索了这个问题很多,而我到处获得的解决方案只是将setState设置为true / false来启用/禁用按钮。我做了但没有用,因为它为该页面上的所有产品做了。请帮帮我怎么做。
这是我的REACT JS代码:
export default class SpareParts extends Component
{
constructor()
{
super()
this.state = {
spareParts: [],
cart: [],
inCart: false,
disabledButton: false
};
this.ViewDeets = this.ViewDeets.bind(this);
this.AddToCart = this.AddToCart.bind(this);
}
ViewDeets= function (part)
{
this.props.history.push({
pathname: '/partdetails',
state: {
key: part
}
});
}
AddToCart(param, e)
{
var alreadyInCart = JSON.parse(localStorage.getItem("cartItem")) || [];
alreadyInCart.push(param);
localStorage.setItem("cartItem", JSON.stringify(alreadyInCart));
this.setState({
inCart: true,
disabledButton: true
})
}
componentDidMount()
{
console.log("Showing All Products to Customer");
axios.get('http://localhost/Auth/api/customers/all_parts.php', {
headers: {
'Accept': 'application/json, text/plain, */*',
'Content-Type': 'application/json'
}} )
.then(response =>
{
this.setState({
spareParts :response.data.records
});
})
.catch(error => {
if (error) {
console.log("Sorry Cannot Show all products to Customer");
console.log(error);
}
});
}
render()
{
return (
<div id="profileDiv">
{this.state.spareParts.map( part =>
<Col md="3" lg="3" sm="6" xs="6">
<Card>
<Image src={"data:image/png[jpg];base64," + part.Image}
id="partImg" alt="abc" style={ {width: "90%"}} />
<h4> {part.Name} </h4>
<h5> Rs. {part.Price} </h5>
<h5> {part.Make} {part.Model} {part.Year} </h5>
<h5> {part.CompanyName} </h5>
<button
onClick={()=> this.ViewDeets(part) }>
View Details
</button>
<button onClick={() => this.AddToCart(part.SparePartID)}
disabled={this.state.disabledButton ? "true" : ""}>
{!this.state.inCart ? ("Add to Cart") : "Already in Cart"}
</button>
</Card>
</Col>
)}
</div>
);
}
}
你只需要一次禁用一个按钮吗?如果是这样,请将您的状态更改为不是布尔值,而是指示禁用哪个按钮的数字。然后在渲染中,仅在您渲染的按钮具有与状态中找到的索引相同的索引时才禁用。
this.state = {
disabledButton: -1
// ...
}
// ...
AddToCart(index, param, e) {
//...
this.setState({
inCart: true,
disabledButton: index
})
}
// ...
{this.state.spareParts.map((part, index) => {
// ...
<button onClick={() => this.AddToCart(index, part.SparePartID)}
disabled={this.state.disabledButton === index}>
{!this.state.inCart ? ("Add to Cart") : "Already in Cart"}
</button>
})}
相反,如果每个按钮需要同时独立禁用,请将状态更改为与备件长度相同的布尔数组,并且在render方法中,每个按钮都会查找是否应在该数组中禁用它。
this.state = {
spareParts: [],
disabledButtons: [],
// ...
}
// ...
axios.get('http://localhost/Auth/api/customers/all_parts.php', {
headers: {
'Accept': 'application/json, text/plain, */*',
'Content-Type': 'application/json'
}} )
.then(response =>{
this.setState({
spareParts: response.data.records,
disabledButtons: new Array(response.data.records.length).fill(false)
});
});
// ...
AddToCart(index, param, e) {
//...
this.setState(oldState => {
const newDisabledButtons = [...oldState.disabledButtons];
newDisabledButtons[index] = true;
return {
inCart: true,
disabledButtons: newDisabledButtons,
}
});
}
// ...
{this.state.spareParts.map((part, index) => {
// ...
<button onClick={() => this.AddToCart(index, part.SparePartID)}
disabled={this.state.disabledButtons[index]>
{!this.state.inCart ? ("Add to Cart") : "Already in Cart"}
</button>
})}