在REACT JS中,我在状态组件“ myrecords ”中有一个 JSON对象,其中项目按其公司名称分组,并且具有格式如下:
{
"Master Automotives": [
{
"SparePartID": "43",
"Name": "Oil and Lubricants",
"Price": "4500",
"VendorID": "48",
"CompanyName": "Master Automotives",
"Qty": 1,
"TotalPrice": "4500"
},
{
"SparePartID": "45",
"Name": "Lights",
"Price": "2300",
"VendorID": "48",
"CompanyName": "Master Automotives",
"Qty": 1,
"TotalPrice": "2300"
}
],
"Repair Solutions": [
{
"SparePartID": "47",
"Name": "Steering Wheel",
"Price": "1500",
"VendorID": "60",
"CompanyName": "Repair Solutions",
"Qty": 1,
"TotalPrice": "1500"
}
],
"FiveStar Automotives": [
{
"SparePartID": "51",
"Name": "Brakes",
"Price": "234",
"VendorID": "70",
"CompanyName": "FiveStar Automotives",
"Qty": 1,
"TotalPrice": "234"
},
{
"SparePartID": "53",
"Name": "Clutch",
"Price": "999",
"VendorID": "70",
"CompanyName": "FiveStar Automotives",
"Qty": 1,
"TotalPrice": "999"
},
{
"SparePartID": "55",
"Name": "LED",
"Price": "288",
"VendorID": "70",
"CompanyName": "FiveStar Automotives",
"Qty": 1,
"TotalPrice": "288"
}
]
}
只要使用针对某项的删除按钮,我就会使用此方法从 myrecords 状态中删除特定项:
removeCartItem(CompanyName, sid,e)
{
const items = {...this.state.myrecords};
const j = items[CompanyName].findIndex(item => item.SparePartID === sid);
items[CompanyName].splice([j], 1);
this.setState({
myrecords: items
});
}
我在功能参数中发送 CompanyName ,SparePartID作为 sid 来执行删除操作。
它可以完美完成并删除我单击的项目。
但是问题是,如果某公司只有一个项目并且我将其删除,则 myreocords JSON对象仍然包含该公司的数组为空(无项目)。 相反,我希望它删除没有任何项目的公司。
状态为 myrecords 的SO仅应包含存在其项目的 Company 数据。
请帮助我解决此问题。
答案 0 :(得分:3)
如果没有项目,则应删除该节点:
removeCartItem(CompanyName, sid,e) {
const items = {...this.state.myrecords};
const j = items[CompanyName].findIndex(item => item.SparePartID === sid);
items[CompanyName].splice([j], 1);
// rm company node if it have no items
if (items[CompanyName].length === 0) {
delete items[CompanyName]
}
this.setState({
myrecords: items
});
}