为什么我的参数没有被传递到发送事件? [英] Why aren't my parameters getting passed through to a dispatched event?
问题描述
OK,所以我设置了一个这样的事件听者...
window.addEventListener('message' parseMessage,false);
var parseMessage = function(rawMessage){
console.log(rawMessage.cmd);
};
然后我触发了这样的事件:
var event = new Event('message',{'cmd':blerg!});
window.dispatchEvent(event);
问题是解析消息中的console.log在我想要登录时注销未定义outblerg!
我在这里遇到什么事情,我怎么把'cmd'消息传递给事件?
-
使用
自定义事件
cc c c > 在details对象中指定您的数据(见代码)。
-
我更改了事件名称,因为
/ code>也用于 postMessage API 。在Chrome中运行时不会出现问题,但我不会使用它。
var parseMessage = function(rawMessage){
console.log(rawMessage);
console.log(rawMessage.detail.cmd);
};
//更改事件名称
window.addEventListener('myMessage',parseMessage,false);
//数据应该在'details'对象
var evt = new CustomEvent('myMessage',{
detail:{
'cmd': blerg!
}
});
window.dispatchEvent(evt);
这是IE> = 9兼容性的调整(使用 document.createEvent()
和 CustomEvent :: initCustomEvent()
):
var evt = document.createEvent(CustomEvent);
evt.initCustomEvent('myMessage',false,false,{
'cmd':blerg!
});
Ok so I've set up an event listenr like this...
window.addEventListener('message', parseMessage, false);
var parseMessage = function(rawMessage) {
console.log(rawMessage.cmd);
};
And then I'm triggering the event like this:
var event = new Event('message', {'cmd':"blerg!"});
window.dispatchEvent(event);
The problem is the console.log in parse message is logging out undefined when I am expecting to to log out "blerg!"
What I am I doing wrong here with the events, how to I pass the 'cmd' message through to the event?
Use
CustomEvent
instead ofEvent
for creating custom events.Specify your data in a 'details' object (see code).
I changed the event name because
message
is also used for the postMessage API. It didn't cause problems when running in Chrome, but I wouldn't use it.
var parseMessage = function(rawMessage) {
console.log(rawMessage);
console.log(rawMessage.detail.cmd);
};
// changed event name
window.addEventListener('myMessage', parseMessage, false);
// data should be in a 'details' object
var evt = new CustomEvent('myMessage', {
detail: {
'cmd' : "blerg!"
}
});
window.dispatchEvent(evt);
Here is an adjustment for IE >= 9 compatiblity (using document.createEvent()
and CustomEvent::initCustomEvent()
):
var evt = document.createEvent("CustomEvent");
evt.initCustomEvent('myMessage', false, false, {
'cmd': "blerg!"
});
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