[英]Assign value to 2d array in React/JavaScript
I am working on a React project where i need a multidimensional constant using useState which stores +/- symbols on some condition.我正在研究一个 React 项目,我需要一个使用 useState 的多维常量,它在某些条件下存储 +/- 符号。
const [button, setButton] = useState([["+"]]);
and i have the condition something like:我有这样的条件:
const handleAddFields = (data_index, index, e) => {
console.log("aaaaa!!!", data_index)
console.log("bbbbb!!!",index)
if (button[data_index][index] === "+") {
const btn = [...button]
btn[data_index][index] = "-"
btn[data_index].push(["+"])
setButton(btn)
const btnColour = [...btnClass]
btnColour[index] = "danger"
btnColour.push("primary")
setBtnClass(btnColour)
} else {
const btn = [...button]
btn.splice(index, 1);
setButton(btn)
const btnColour = [...btnClass]
btnColour.splice(index, 1);
setBtnClass(btnColour)
const values = [...inputFields];
values.splice(index, 1);
setInputFields(values);
}
};
i am getting an error as我收到一个错误
Cannot assign to read only property '0' of string '+'
at在
btn[data_index][index] = "-"
this line这条线
The Place where the function handleAddFields is called is a button函数handleAddFields被调用的地方是一个按钮
<Button name="btn" id="button" type="button" color={btnClass[data_index][index]} block onClick={(e) => handleAddFields(data_index, index, e)}>{button[data_index][index]}</Button>
I think React does not allow assigning value to multidimensional array.我认为 React 不允许为多维数组赋值。
What could be the possible solution to this?可能的解决方案是什么?
看起来您的输入是空的,请尝试为其分配一些值
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