我的onClick
按钮正在调用函数getUserInput(i, event)
,但是,由于onClick
事件绑定(bind
)到(this, id)
,所以我不能了解我将如何传递over“事件”参数?
功能:
getUserInput = (i, event) => {
event.preventDefault();
const searchLocation = document.getElementById(i).value;
this.state.locationArray[i].location = searchLocation;
this.setState({
locationArray: this.state.locationArray
})
this.createGrid();
}
按钮:
<form className="form" role="search" autoComplete="off">
<input id={id} className="searchBar" type="search" name="searchField" placeholder={filledArray[i].name}></input>
<button onClick={this.getUserInput.bind(this, id)} value="submit" className="searchButton"><i className="fa fa-search"></i></button>
</form>
答案 0 :(得分:1)
.bind
通过在开头添加传递给它的参数,然后添加默认参数,然后将该函数绑定到正确的上下文(因此在您编写时),来返回一个新函数
onClick={this.getUserInput.bind(this, id)}
getUserInput
将id作为第一个参数,将默认参数(即event)作为第二个参数,因此您无需显式传递它
bind
函数的典型实现是
Function.prototype.bind = function(context){
var that = this,
slicedArgs = Array.prototype.splice.call(arguments, 1),
bounded = function (){
var newArgs = slicedArgs.concat(Array.prototype.splice.call(arguments, 0));
return that.apply(context,newArgs);
}
bounded.prototype = that.prototype;
return bounded;
}