[英]How to add item in select dropdown by button click event
I have an bootstrap select dropdown control in react js application.I would like to know how to add item (input text control)in dropdown when I click on button.Please check my below code and advise how to do this..我在 react js 应用程序中有一个引导 select 下拉控件。我想知道当我单击按钮时如何在下拉列表中添加项目(输入文本控件)。请检查我下面的代码并建议如何执行此操作..
initial state:-初始 state:-
this.state = {
DivisionState: [],
DivisionName :''
};
loading item in dropdown:-在下拉列表中加载项目:-
componentDidMount() {
axios.get(ConfigItem[0].APIPath+'Menus/P')
.then(res => {
this.setState({DivisionState:res.data.data});
})
This is an button click event by adding item in dropdown:-这是通过在下拉列表中添加项目的按钮单击事件:-
addDivisionHandler = () => {
// here I would like to know how to add item by button click
// for example, I need to add input text value (divisionname in dropdown)
}
html render:- html 渲染:-
render() {
let DivisionList = this.state.DivisionState.length > 0
&& this.state.DivisionState.map((item, i) => {
return (
<option key={i} value={item.MenuId}>{item.MenuName}</option>
)
}, this);
return (
<select name ="ParentId"
{DivisionList}
</select>
<input type="text" name ="DivisionName" className="form-control form-control-sm" id="TxtDivision" placeholder="Division" value={this.state.DivisionName} required onChange={this.onChangeHandler}/>
<Button type="button" size="sm" color="success"onClick={addDivisionHandler } ><i className="fa fa-dot-circle-o"></i> Add Division</Button>
Your addDivisionHandler would look something like this:您的 addDivisionHandler 看起来像这样:
addDivisionHandler = () => {
this.setState(prev => ({
DivisionName: '', // Resets input back to empty
DivisionState: [...prev.DivisionState, { MenuId: prev.DivisionName, MenuName: prev.DivisionName }] // Add value of DivisionName to list of DivisionState
});
}
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