When an event that is hooked occurs, browsers call its event handler and wait for it to return before continuing on to the next event.

当连接的事件发生时，浏览器调用它的事件处理器，并等待它返回，然后再继续处理下一个事件。

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To make the GUI implementation modular, I use something I call a drag handler.

为了使 GUI 的实现模块化，我使用了拖动处理程序。

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In the example in Listing 2, XPathHandler will call into the application handler, HCCountHandler.

在清单2中的示例里，应用处理程序HCCountHandler将调用XPathHandler。

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The problem was compounded by the fact the first call handler did not take full details.

BBC: 999 call handler sacked after Cardiff mother's murder

Both the call handler and paramedics who arrived had "misgivings" about the parents' account of their daughter's injuries.

BBC: Toddler Lia Green's father 'delivered fatal blow'

During busy periods the call handler will agree a time for an adviser to ring back, within a three-hour timeframe.

BBC: NHS Direct Wales 'turned off' for 999 calls, Unison claims