属性＆＃39;数据集＆＃39;在类型＆＃39; EventTarget＆＃39;

Question

点击后尝试访问按钮上的数据集时，我得到这个^错误。

linkProvider = (ev: React.SyntheticEvent<EventTarget>) => {
  console.debug('ev.target', ev.target.dataset['ix']) // error
}

// in render 
providers.map((provider, ix) => (
  <button key={provider} data-ix={ix} onClick={this.linkProvider}>{provider}</button>
))

任何想法如何使其发挥作用？

Answer 1

问题在于Element，document，window可以是EventTarget。您应该检测到EventTarget if是否为元素。所以在你的情况下代码应该工作

linkProvider = (ev: React.SyntheticEvent<EventTarget>) => {
  // If event target not an HTMLButtonElement, exit
  if (!(ev.target instanceof HTMLButtonElement)) {
    return;
  }
  console.debug('ev.target', ev.target.dataset['ix']) 
}

短暂的

linkProvider = (ev: React.SyntheticEvent<HTMLButtonElement>) => {
  console.debug('ev.target', ev.currentTarget.dataset['ix']) 
}

我还添加了示例here

Answer 2

结合@Efe和@fatemefazli提供的两个建议，我找到了一个有效的解决方案：

供参考，这是界面及其与target无法合作的原因：（github link）

interface SyntheticEvent<T> {
    /**
     * A reference to the element on which the event listener is registered.
     */
    currentTarget: EventTarget & T;

    // If you thought this should be `EventTarget & T`, see https://github.com/DefinitelyTyped/DefinitelyTyped/pull/12239
    /**
     * A reference to the element from which the event was originally dispatched.
     * This might be a child element to the element on which the event listener is registered.
     *
     * @see currentTarget
     */
    target: EventTarget;

    // ...
}