[英]Can not fire a event from a Polymer 3 Mixin
I have the below in a mixin.我在mixin中有以下内容。 However,
dispatchEvent
is not attached to this
.但是,
dispatchEvent
没有附加到this
。 I get the error Cannot read property 'dispatchEvent' of undefined
.我收到错误
Cannot read property 'dispatchEvent' of undefined
。
So, I used window.dispatchEvent
instead but the event doesn't get caught by the parent element.所以,我改用
window.dispatchEvent
但事件不会被父元素捕获。 Any ideas what I can do to fire a event in a mixin?有什么想法可以在mixin中触发事件吗?
fetchError(response) {
...
this.dispatchEvent(new CustomEvent(
'http-error', {bubbles: true, detail: msg, composed: true}
));
return Promise.reject(new Error(response.statusText));
}
You probably need to bind the method您可能需要绑定方法
Add this to your mixin:将此添加到您的 mixin 中:
constructor() {
super();
this.fetchError = this.fetchError.bind(this)
}
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