我有一个简单的API调用,用它的响应设置列表数组的状态。我想知道如果有一个糟糕的搜索(比如拼写错误)或者数组未设置响应,我将如何实现try / catch或错误消息。代码段如下:
componentDidMount() {
this.search('https://itunes.apple.com/search?term=modern_baseball');
}
search(URL) {
return $.ajax({
type: 'GET',
dataType: 'json',
url: URL,
success: function (response) {
this.showResults(response);
}.bind(this),
error: function() {
alert("Error handling request");
}
});
}
showResults(response) {
console.log(response);
this.setState({
searchResults: response.results,
moveResults: []
});
}
答案 0 :(得分:1)
尝试这样的事情:
componentDidMount() {
this.search('https://itunes.apple.com/search?term=modern_baseball');
}
search(URL) {
let self = this; //avoid the .bind call and store a ref to the current context for use inside the ajax handlers.
return $.ajax({
type: 'GET',
dataType: 'json',
url: URL,
success: function (response) {
self.showResults(response);
},
error: function() {
alert("Error handling request");
self.setState({error: "Error handling request", moveResults:[], searchResults:[]}); //set the state directly if there is an error
}
});
}
showResults(response) {
console.log(response);
this.setState({
searchResults: response.results,
moveResults: []
});
}
它将变量(self)设置为当前上下文(this),然后直接在错误处理程序中调用setState以进行ajax调用。或者,您可以像成功处理程序一样定义回调函数。