我正在尝试使用react挂钩将数组添加到现有数组。我唯一的问题是我尝试执行的所有操作都导致无法填充数组...
const [ residenceFinal, setResidenceFinal ] = useState([]);
我在这里和下面创建值,我试图将一个现有数组添加到ResidenceFinal。
const predefinedMenuItems = {
residences: {
closeOnClick: false,
setActiveOnClick: true,
tooltip: "Residences",
content: <i className='fas fa-city'/>,
onClick: () => {
dispatch(getValue(value));
},
getContent: (controlledEntity) => {
const divTitle = "Residence info";
let res = controlledEntity.info;
const {data} = res;
let residencesInfo = [];
_.isArray(data) ? residencesInfo = data : residencesInfo.push(data);
let resiFinal = residencesInfo.map(function(el) {
var o = Object.assign({}, el);
o.isActive = false;
return o;
})
setResidenceFinal(resiFinal);
return <div className="open-data-information-drawer-item residences">
<h1>{divTitle}</h1>
<div className="open-data-item-information-container">
{residenceFinal.map((residence, idx) => {
return <div className={"open-data-item-information-container-item "+ (residence.isActive ? 'active' : '') + " item-" + idx} onClick={ (e) => onClickIdentification(residence, idx)} key={idx}>
{getOpenDataLi(residence, "identificatiecode")}
{getOpenDataLi(residence, "status")}
{getOpenDataLi(residence, "oppervlakte")}
}
</div>;
})}
</div>
</div>;
}
}
}
因此,我尝试了很多变体来将resiFinal添加到ResidenceFinal(我将其固定时,命名将会更改),但是每次我检查时,residenceFinal仍然为空...
有人可以帮我吗?
编辑:在使用getContent的地方添加。
const [ drawerContent, setDrawerContent ] = useState(<div></div>);
function handleClick(index, e) {
const selectedMenuItem = menuItems.find(m => m.id === index);
setDrawerContent(selectedMenuItem.getContent(openData));
}
<List.Item >
<div key={predefinedMenuItemId} onClick={ e => handleClick(predefinedMenuItemId, e)} className={isMenuItemActive ? 'list-item list-item-' + predefinedMenuItemId : 'list-item list-item-' + predefinedMenuItemId }></div>
</List.Item >
将数组添加到现有数组的方法
push()方法
扩展运算符
concat()方法
let array = [1,2];
array.push(...[3,4])
console.log(array)
let array2 = [10,11];
let newArray = [...array2, ...[12,13]];
console.log(newArray)
let array3 = [20,21];
let newArray2 = [22,23].concat(...array3)
console.log(newArray2)
您可以使用这种方式添加。
setResidenceFinal([...residenceFinal, ...resiFinal]);
您需要使用扩展语法
其工作方式示例:
var colors = ['red', 'green', 'blue'];
var refColors = [...colors, 'yellow'];
//colors => ['red', 'green', 'blue']
//refColors => ['red', 'green', 'blue', 'yellow']
适合您的情况
setResidenceFinal(current => [...current, ...resiFinal])