如何在同一个onClick事件ReactJS上调用多个函数 [英] How to call multiple functions on the same onClick event ReactJS
问题描述
我有这个功能,当我点击< li>
标记时,我想调用两个函数, onClick = {handleProjectSelection(项目)}
一个来自父组件的道具的处理函数,还有这个函数 onClick = {()=> this.setState({showingProjectSelector:false})}
renderDropdown(){
const(displayDropdown,projects,handleProjectSelection)= this.props $ b $ if(this.state.showingProjectSelector&&displayDropdown){
const projectsList = projects.map((project)=>(
< li className ='u-cursor - pointer u-font-size - 12px'
key = {project.get('id')}
onClick = {handleProjectSelection(project) }>
< i className ='fa fa-square u-font-size - 10px'style = {{color:project.get('color')}}< / i>
{project.get('name')}
< / li>
))
我怎样才能调用这两个函数?
这是来自父组件的处理函数
pre code> handleProjectSelection =(project)=> ()=> {
this.setState({
projectToAdd:project.get('id'),
projectToAddColor:project.get('color'),
projectToAddName:project.get 'name')==='default'?'否':project.get('name')。substring(0,2)
})
}
$ c $
<$ p $ p>
onClick = {()=> {
handleProjectSelection(project);
anotherfunctionCall();
}}
或者创建一个函数,将其用作点击处理程序。在这个函数内部调用其他两个函数,像这样:
pre $ $ $ $ c $ onClick = {this.handleClick}
handleClick(){
function1();
function2();
查看有两种方法使用箭头函数:
1-简明正文:()=> / *单个表达式* /
<2>块体:
()=> {}
在 {}
(函数体)内的块体中,我们可以执行任意数量的任务。
像这样:
onClick = {()=> {
fun1();
fun2();
fun3();
fun4();
....
funN();
}}
I have this function and when I click on the <li>
tag, I want to call two functions, onClick={handleProjectSelection(project)}
a handler function that comes from props from the parent component, and also this function onClick={() => this.setState({ showingProjectSelector: false })}
renderDropdown () {
const { displayDropdown, projects, handleProjectSelection } = this.props
if (this.state.showingProjectSelector && displayDropdown) {
const projectsList = projects.map((project) => (
<li className='u-cursor--pointer u-font-size--12px'
key={project.get('id')}
onClick={handleProjectSelection(project)} >
<i className='fa fa-square u-font-size--10px' style={{color: project.get('color')}}></i>
{project.get('name')}
</li>
))
How can I call this two functions? This is the handler function from the parent component
handleProjectSelection = (project) => () => {
this.setState({
projectToAdd: project.get('id'),
projectToAddColor: project.get('color'),
projectToAddName: project.get('name') === 'default' ? 'No' : project.get('name').substring(0, 2)
})
}
Write it like this:
onClick={() => {
handleProjectSelection(project);
anotherfunctionCall();
}}
Or create a single function, use that as a click handler. Inside that function call other two functions, Like this:
onClick={this.handleClick}
handleClick(){
function1();
function2();
}
See there are two ways of using arrow function:
1- Concise Body: () => /*single expression*/
2- Block Body: () => {}
In block body inside {}
(body of the function), we can perform any number of task.
Like this:
onClick={() => {
fun1();
fun2();
fun3();
fun4();
....
funN();
}}
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