如何在React js中为映射后的特定分区分配类名

Question

我在div中映射数据，我只需要一个到div的边界"lab_add_to_cart_samp1"；classname。我很困惑如何使分区显示活动onclick，即使在映射数据后，也有一个来自API的allabtest数组调用

<div className="lab_add_to_cart_samp">
{
allabtest.map((item, index) => {
return <div className="lab_add_to_cart_samp1" key={index}>
<div className="lab_add_to_cart_samp_img1">
<img src={REACT_APP_BASE_URL+"lab-test/download/"+item.id} />
</div>
<div className="lab_add_to_cart_test_desc">
<p id="labtest_desc_txt1">{item.name}</p>
<p id="labtest_desc_txt2">What it include :</p>
<div className="labtest_desc1">
<div className="labtest_desc_detail">
<ul>
<li>Platate</li>
<li>CBC</li>
<li>HB</li>
</ul>
</div>
<div>
<ul id="lab_test_detail">
<li>PCV</li>
<li>WBC/TLC</li>
<li>WBC/TLC</li>
</ul>
</div>
<div>
<ul id="lab_test_detail">
<li>DLC</li>
<li>RBC</li>
<li>ESR</li>
</ul>
</div>
<div>
<ul id="lab_test_detail">
<li>Platelets</li>
<li>Reticilocytes</li>
<li>Blood Grouping Rh type</li>
</ul>
</div>
</div>
</div>
<div className="lab_add_to_cart_price">
<p>Rs. {item.price}</p>
<div className="lab_add_to_cart_atc">
<button onClick={()=>addtocart(item)}>
<p>Add to Cart</p>
</button>
</div>
</div>
</div>

})
}
</div>

Answer 1

如果你想同时为多个div设置active，你可以这样做

const allabtest = [
{id: 'one', name: 'one'},
{id: 'two', name: 'two'},
{id: 'three', name: 'three'},
]
function App() {
const [activeCart, setActiveCart] = useState({});
return (
<div className="lab_add_to_cart_samp">
{allabtest.map((item, index) => {
return (
<div
className={
activeCart[item.id] === true
? "lab_add_to_cart_samp1 active"
: "lab_add_to_cart_samp1"
}
onClick={() =>
setActiveCart({
...activeCart,
[item.id]: !Boolean(activeCart[item.id])
})
}
key={item.id}
>
<div>{item.name}</div>
</div>
);
})}
</div>
);
}

如果你只想跟踪一个div，那么

function App() {

const [activeCart, setActiveCart] = useState();
return (
<div className="lab_add_to_cart_samp">
{allabtest.map((item, index) => {
return (
<div
className={
activeCart === item.id
? "lab_add_to_cart_samp1 active"
: "lab_add_to_cart_samp1"
}
onClick={() => setActiveCart(item.id)}
key={item.id}
>
{/* Rest of your stuffs */}
</div>
);
})}
</div>
);
}