原型“展出” Event.observe 处理程序
我正在尝试发出一个 AJAX 请求,以在显示 div 时更新该 div 的内容。我最初的想法是使用事件观察器来监视要显示的 div,但我似乎找不到合适的处理程序。有没有一种简单的方法可以对“显示”的元素发出 AJAX 请求?
I am trying to make an AJAX request that updates a div's content when that div is shown. My initial thought was to use an Event observer that watched for a div to be shown, but I cannot seem to find an appropriate handler. Is there an easy way to make an AJAX request for an element 'on show?'
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我认为“显示”是指在浏览器视口中可见。在这种情况下,您需要检查某个元素是否在视口内,然后观察任何会改变此情况的内容。
这是一个用于检查元素是否在视口内的基本函数:
例如,您可以观察滚动事件以检查元素是否已移入视图
By "on show" i assume you mean is visible within the browser viewport. In which case you would need to check if an element is within the viewport and then observe anything that would change this.
This is a rudimentary function for checking if an element is within viewport:
You could then - for example - observe the scroll event to check if the element has moved into view