XMLHttpRequest: load event
当一个XMLHttpRequest
请求完成的时候会触发load
事件。
Bubbles | No |
---|---|
Cancelable | No |
Interface | ProgressEvent |
Event handler property | onload |
示例
在线例子
HTML
<div class="controls">
<input class="xhr success" type="button" name="xhr" value="Click to start XHR (success)" />
<input class="xhr error" type="button" name="xhr" value="Click to start XHR (error)" />
<input class="xhr abort" type="button" name="xhr" value="Click to start XHR (abort)" />
</div>
<textarea readonly class="event-log"></textarea>
JS
const xhrButtonSuccess = document.querySelector('.xhr.success');
const xhrButtonError = document.querySelector('.xhr.error');
const xhrButtonAbort = document.querySelector('.xhr.abort');
const log = document.querySelector('.event-log');
function handleEvent(e) {
log.textContent = log.textContent + `${e.type}: ${e.loaded} bytes transferred\n`;
}
function addListeners(xhr) {
xhr.addEventListener('loadstart', handleEvent);
xhr.addEventListener('load', handleEvent);
xhr.addEventListener('loadend', handleEvent);
xhr.addEventListener('progress', handleEvent);
xhr.addEventListener('error', handleEvent);
xhr.addEventListener('abort', handleEvent);
}
function runXHR(url) {
log.textContent = '';
const xhr = new XMLHttpRequest();
addListeners(xhr);
xhr.open("GET", url);
xhr.send();
return xhr;
}
xhrButtonSuccess.addEventListener('click', () => {
runXHR('dgszyjnxcaipwzy.jpg');
});
xhrButtonError.addEventListener('click', () => {
runXHR('https://somewhere.org/i-dont-exist');
});
xhrButtonAbort.addEventListener('click', () => {
runXHR('dgszyjnxcaipwzy.jpg').abort();
});
结果
规范
Specification |
---|
XMLHttpRequest Standard # event-xhr-load |
XMLHttpRequest Standard # handler-xhr-onload |
浏览器兼容性
BCD tables only load in the browser