[英]Insert object if key doesn't exist
我正在使用 recharts 在圖表中添加新行,其中 object 的鍵值等於另一個 object 的鍵值。 它在找到密鑰時工作正常,但如果找不到密鑰值,腳本不會插入新的 object。
我在 state 中有這個對象數組
{
chartData: [
{ name: "100", line1: "332" },
{ name: "200", line1: "1235" },
{ name: "300", line1: "43534" },
{ name: "500", line1: "645324" },
{ name: "1000", line1: "345345" },
{ name: "2000", line1: "234234" },
{ name: "5000", line1: "654654" },
{ name: "10000", line1: "123" },
]
}
而這個 function 正在添加一個值相同的行
function addLine() {
let newData = [
{ name: '100', line2: '6666' },
{ name: '230', line2: '2342342' },
{ name: '420', line2: '34234' },
{ name: '120', line2: '123656' },
{ name: '630', line2: '234245' },
];
newData.map((io) => {
this.setState((prevState) => ({
chartData: prevState.chartData.map((el) =>
el.name === io.name ? { ...el, line2: io.line2 } : { ...io, newData }
),
}));
});
}
如何插入 newData 中未在newData
中找到的chartData
?
可以在此處找到示例https://codesandbox.io/s/recharts-toggle-legend-forked-i1qbd?file=/SampleChart.jsx:847-1310
試試這個,如果它滿足你需要的結果,請告訴我
addLine() {
const newData = [
{ name: "100", line2: "6666" },
{ name: "200", line2: "2342342" }
];
const { chartData } = this.state;
const modifiedData = chartData;
// First add line2 values to the modifiedData array
chartData.map((data, index) =>
newData.map(({ name, line2 }) => {
// Update the specific index with line2
if (data.name === name)
modifiedData[index] = { ...data, line2 };
// push values that do not exist on modifiedData
if (!modifiedData.some(modData => modData.name === name))
modifiedData.splice(index, 0, { name, line2 }); // This is very important, if you want the new line to be connected if its data is not equal to chartData
return data;
})
);
this.setState({ chartData: modifiedData });
}
newData.map((io) => {
this.setState((prevState) => ({
chartData: prevState.chartData.map((el) =>
el.name === io.name ? { ...el, line2: io.line2 } : { ...io, newData }
),
}));
});
將此替換為:
let chartData = this.state.chartData;
newData.map((io) => {
const matchIdx = chartData.findIndex(el => el.name === io.name);
if (matchIdx !== -1) {
chartData[matchIdx] = {
...chartData[matchIdx],
line2: io.line2
};
} else {
chartData.push(io);
}
});
this.setState({ chartData: chartData });
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