Javascript 如何在条件组件内处理onClick事件
我正在尝试对从AsyncTypeahead中选择的数据添加onClick事件。我将回调函数传递给仅当我选择了一个项时才呈现的问题。但在选择一个项之后,它会直接调用我传递给问题组件的回调函数 这是主要组成部分Javascript 如何在条件组件内处理onClick事件,javascript,reactjs,next.js,bootstrap-typeahead,Javascript,Reactjs,Next.js,Bootstrap Typeahead,我正在尝试对从AsyncTypeahead中选择的数据添加onClick事件。我将回调函数传递给仅当我选择了一个项时才呈现的问题。但在选择一个项之后,它会直接调用我传递给问题组件的回调函数 这是主要组成部分 constructor(props) { super(props); this.state = { plateform: '', selected: [], isLoading: false, options:
constructor(props) {
super(props);
this.state = {
plateform: '',
selected: [],
isLoading: false,
options: []
};
this.handleInputChange = this.handleInputChange.bind(this);
this.saveTodo = this.saveTodo.bind(this);
}
async handleInputChange(event) {
const target = event.target;
const value = target.value;
const name = target.name;
await this.setState({
[name]: value
});
}
saveTodo(problemID) {
axios.post(`${API}/todos`,
{
problemID: problemID
},
{
headers: {
Accept: "application/json",
'Content-Type': 'application/json',
'Authorization': 'Bearer ' + this.props.auth.token
}
})
.then(() => alert("Problem saved to todo list"))
.catch((err) => {
if (err.response) {
alert(err.response.data);
}
else {
alert("Sorry! A server error occurred. Try to save this problem later!");
}
});
}
render() {
return (
<>
<TrainLayout auth={this.props.auth} deauthenticate={this.props.deauthenticate} title={title} description={description} >
<div className="container">
<div className="row justify-content-center">
<div className="offset-md-3 col-md-7 offset-2">
<br />
<div className="form-group row">
<label htmlFor="oj" className="col-4 col-form-label col-form-label-sm">Online Judge</label>
<div className="col-8 col-md-5">
<select id="oj" type="select" className="form-control form-control-sm" name="plateform" onChange={this.handleInputChange} value={this.state.plateform}>
<option value="all">All Online Judges</option>
<option value="xxx">XXX</option>
<option value="yyy">YYY</option>
<option value="zzz">ZZZ</option>
</select>
</div>
</div>
<div className="form-group row">
<label htmlFor="pname" className="col-4 col-form-label col-form-label-sm">Problem Name</label>
<div className="col-8 col-md-5">
<AsyncTypeahead
isLoading={this.state.isLoading}
allowNew={false}
multiple={false}
id="pname"
labelKey={option => `${option.name} (${option.plateform})`}
minLength={2}
onChange={selected => this.setState({ selected })}
placeholder="Search for a problem"
onSearch={query => {
this.setState({isLoading: true});
axios.get(`${API}/problems/${query}`,
{
params: {
plateform: this.state.plateform
},
headers: {
Accept: "application/json",
'Content-Type': 'application/json',
'Authorization': 'Bearer ' + this.props.auth.token
}
})
.then((response) => { /* eslint-disable-line camelcase */
const options = response.data.map((problem) => ({
_id: problem._id,
problemID: problem.problemID,
name: problem.name,
plateform: problem.plateform,
link: problem.link,
difficulty: problem.difficulty
}));
console.log("DATA: ", options);
this.setState({
isLoading: false,
options: options,
});
});
}}
options={this.state.options} />
</div>
</div>
</div>
</div>
</div>
<br /><br />
<div className="container">
<div className="row justify-content-center">
{!!this.state.selected &&
(
<Problem saveTodo={this.saveTodo} problem={this.state.selected[0]} />)
}
</div>
</div>
</TrainLayout>
</>
);
}
构造函数(道具){
超级(道具);
此.state={
平台:“”,
选定:[],
孤岛加载:false,
选项:[]
};
this.handleInputChange=this.handleInputChange.bind(this);
this.saveTodo=this.saveTodo.bind(this);
}
异步handleInputChange(事件){
const target=event.target;
常量值=target.value;
const name=target.name;
等待这一天({
[名称]:值
});
}
saveTodo(问题ID){
post(`${API}/todos`,
{
problemID:problemID
},
{
标题:{
接受:“应用程序/json”,
“内容类型”:“应用程序/json”,
“授权”:“持有人”+this.props.auth.token
}
})
。然后(()=>警报(“问题已保存到待办事项列表”))
.catch((错误)=>{
如果(错误响应){
警报(错误响应数据);
}
否则{
警报(“抱歉!发生服务器错误。请稍后尝试保存此问题!”);
}
});
}
render(){
返回(
在线法官
所有在线评委
XXX
YYY
ZZZ
问题名称
注:难度并非100%准确
);}
您应该将函数作为事件处理程序传递。在您的示例中,您正在立即调用该函数。尝试以下方法
<td> <a onClick={() => saveTodo(problem.problemID)}><FontAwesomeIcon icon="save" /></a> </td>
了解更多信息
<td> <a onClick={() => saveTodo(problem.problemID)}><FontAwesomeIcon icon="save" /></a> </td>