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[英]How to stop recursive setTimeout function in react (clearTimeout not working)?
[英]How do I use cleartimeout to stop a recursive settimeout function in .getJSON?
這是基本網站的javascript代碼,該網站需要一個搜索詞並滾動瀏覽Flickr最近上傳的該搜索詞的某些圖片。
當用戶按下按鈕時,它將開始滾動Flickr圖像,但是如果他進入另一個圖像搜索並再次按下按鈕,則當前圖像滾動應停止,並且應滾動瀏覽新搜索詞中的圖像。
問題在於原始滾動不會停止,它所做的只是使兩者重疊。
var main = function() {
var url = "http://api.flickr.com/services/feeds/photos_public.gne?tags=";
var end = "&format=json&jsoncallback=?";
var input = document.querySelector("body input");
var button = document.querySelector("body button");
var images = document.querySelector("body .images");
var buttonPressed = false;
//This is supposed to be the id of the current settimeout
var isTimeoutRunning;
button.addEventListener("click", function(event) {
if (!buttonPressed) {
buttonPressed = true;
console.log(buttonPressed);
} else {
//This should stop the timeout function before scrollImages
//gets called?
window.clearTimeout(isTimeoutRunning);
buttonPressed = false;
console.log(buttonPressed);
}
var value;
value = input.value;
$.getJSON((url + input.value + end), function(flickrResponse){
scrollImages(0, flickrResponse);
});
});
};
var scrollImages = function(cycle, obj) {
if (cycle === obj.items.length) {
console.log("end reached");
cycle = 0;
}
var imgsrc = document.querySelector("body img");
imgsrc.setAttribute("src", obj.items[cycle].media.m);
isTimeoutRunning = setTimeout(function() {
console.log(isTimeoutRunning);
cycle += 1;
scrollImages(cycle, obj);
}, 2000)
};
您需要在兩個函數之外定義isTimeoutRunning
,例如
var isTimeoutRunning;
var main = function() {
// don't redefine isTimeoutRunning here
// ... etc
}
var scrollImages = function(cycle, obj) { ... }
問題是在isTimeoutRunning
中的scrollImages
被定義為全局的,即window.isTimeoutRunning
。 與main
定義的變量不同。
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