Javascript 更新react表单中的嵌套json值
我的jsonJavascript 更新react表单中的嵌套json值,javascript,reactjs,Javascript,Reactjs,我的json this.state = { name: '', subCatagory: [{ name: '', price: '', customize: [] }], }; 我的地图功能 {this.state.subCatagory.map((subCatagory, idx) => ( <div className="subCatagory" key={idx
this.state = {
name: '',
subCatagory: [{ name: '', price: '', customize: [] }],
};
我的地图功能
{this.state.subCatagory.map((subCatagory, idx) => (
<div className="subCatagory" key={idx}>
<input
type="text"
placeholder={`Enter Dish #${idx + 1} name`}
value={subCatagory.name}
onChange={this.handlesubCatagoryNameChange(idx)}
/>
<input
type="number"
placeholder={`subCatagory #${idx + 1} price`}
value={subCatagory.price}
onChange={this.handlesubCatagoryPriceChange(idx)}
/>
<button
type="button"
onClick={this.handleRemovesubCatagory(idx)}
className="small"
>
Delete
</button>
<button type="button" onClick={this.addNewCust(idx)} className="small">
is cust availble?
</button>
{subCatagory.customize.map((gj, f) => (
<div key={f}>
<input
type="text"
placeholder={`subCatagory #${f + 1} price`}
value={gj.name}
key={gj.key}
onChange={this._pushvaluesto_customize(f)}
/>
</div>
))}
</div>
))}
如何在react表单中使用map更新嵌套的json
my gist如果已经可以访问元素的索引,那么可以直接更新元素值,如下所示,map函数将不必要地在数组中循环。 此处
custIdx
是需要更新的自定义数组元素的索引
handlesubCatagoryChange = (idx, property, custIdx) => evt => {
const subCatagory = this.state.subCatagory
property != 'customize'? subCategory[idx][property] = evt.target.value : subCategory[idx][property][custIdx] = evt.target.value
this.setState({ subCatagory: subCatagory });
};
如果已经可以访问元素的索引,那么可以直接更新元素值,如下所示,map函数将不必要地在数组中循环。 此处
custIdx
是需要更新的自定义数组元素的索引
handlesubCatagoryChange = (idx, property, custIdx) => evt => {
const subCatagory = this.state.subCatagory
property != 'customize'? subCategory[idx][property] = evt.target.value : subCategory[idx][property][custIdx] = evt.target.value
this.setState({ subCatagory: subCatagory });
};
可以通过要点或其他方式详细说明或共享代码。这将有助于我得到未定义的错误'61行:未定义自定义'61行:未定义子类别'61行:未定义子类别'61行:未定义未定义自定义应为字符串谢谢,但我仍然得到'60行:子类别'未定义没有定义undef`errorthis.state.Subtagory未定义?可以根据要点或其他内容详细说明或共享代码。,这将有助于我得到未定义的错误'61行:未定义自定义'61行:未定义子类别'61行:未定义子类别'61行:未定义自定义应为字符串谢谢,但我仍然得到'60行:子类别'未定义没有定义undef`errorthis.state.Subtagory?