本帖最后由 没名字i 于 2020-2-27 10:53 编辑
创建自定义事件(Creating custom events)- 增加自定义数据(Adding custom data - CustomEvent())
- 老式的方式(old-fashioned way)
- 事件冒泡(event bubbling)
- 动态创建和触发事件(creating and dispatching events dynamically)
触发内置事件 (Triggering built-in events)vue项目热力图实战(为iView的Table组件的TableCell DOM元素创建事件并触发,动态增删class实现热力图过滤)
创建自定义事件(Creating custom events)
[AppleScript] 纯文本查看 复制代码 var event = new Event('build');
// Listen for the event.
elem.addEventListener('build', function (e) { /* ... */ }, false);
// Dispatch the event.
elem.dispatchEvent(event);
IE是朵奇葩,需要参考 老式的方式 创建事件。 增加自定义数据(Adding custom data - CustomEvent())CustomEvent()可以通过detail属性为事件增加数据 [AppleScript] 纯文本查看 复制代码 var event = new CustomEvent('build', { detail: "foo" });
elem.addEventListener('build', function (e) { console.log(e.detail) });
老式的方式(old-fashioned way)[AppleScript] 纯文本查看 复制代码 // Create the event.
var event = document.createEvent('Event');
// Define that the event name is 'build'.
event.initEvent('build', true, true);
// Listen for the event.
elem.addEventListener('build', function (e) {
// e.target matches elem
}, false);
// target can be any Element or other EventTarget.
elem.dispatchEvent(event);
事件冒泡(event bubbling)从一个子元素触发事件,祖先元素去捕获它,可以选择性传入数据。 事先创建好自定义事件。 [HTML] 纯文本查看 复制代码 <form>
<textarea></textarea>
</form>
[AppleScript] 纯文本查看 复制代码 const form = document.querySelector('form');
const textarea = document.querySelector('textarea');
form.addEventListener('awesome', e => console.log(e.detail.text()));
textarea.addEventListener('input', function() {
// Create and dispatch/trigger an event on the fly
// Note: Optionally, we've also leveraged the "function expression" (instead of the "arrow function expression") so "this" will represent the element
this.dispatchEvent(new CustomEvent('awesome', { bubbles: true, detail: { text: () => textarea.value } }))
});
触发内置事件[AppleScript] 纯文本查看 复制代码 function simulateClick() {
var event = new MouseEvent('click', {
view: window,
bubbles: true,
cancelable: true
});
var cb = document.getElementById('checkbox');
var cancelled = !cb.dispatchEvent(event);
if (cancelled) {
// A handler called preventDefault.
alert("cancelled");
} else {
// None of the handlers called preventDefault.
alert("not cancelled");
}
}
vue项目热力图实战为iView的Table组件的TableCell DOM元素创建事件并触发,动态增删class实现热力图过滤。
[AppleScript] 纯文本查看 复制代码 methods: {
// 表格订阅事件
tdSubscribe() {
this.$nextTick(() => {
// 获取所有class以blue-alpha开头的table cell
this.tableCells = document.querySelectorAll('td[class^="blue-alpha"]');
this.tableCells.forEach((cell) => {
cell.addEventListener('toggleCell', (e) => {
if (e.detail) {
e.target.classList.add('hidden-cell');
} else {
e.target.classList.remove('hidden-cell');
}
});
});
});
},
// 表格触发事件
tdTrigger(range) {
this.tableCells.forEach((cell) => {
const cellValue = parseInt(cell.innerText);
const rangeMin = range[0];
const rangeMax = range[1];
const hiddenCtrl = cellValue < rangeMin || cellValue > rangeMax;
// 新建自定义事件 toggleCell “toggle渲染单元格”blue-alpha-8-*类名
const toggleEvent = new CustomEvent('toggleCell', { detail: hiddenCtrl });
cell.dispatchEvent(toggleEvent);
});
},
},
链接:https://juejin.im/post/5e5514d8e51d4526f16e49e0
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