调整高度在谷歌地图 [英] Resize height in Google Maps

问题描述

我从谷歌地图API的例子code调整大小的高度地图

I get an example code from Google Map API for resize height "map"

 var recalcHeight = function() {
    $("#map").height($(window).height() - 100); //Example
    map && google.maps.event.trigger(map, 'resize'); //(*) Don't understand this line
}; 
$(window).resize(recalcHeight);
recalcHeight();

好吧，在我的PHP文件，我有一个div标签：
1.我不明白这上面（*）行。

Ok, in my php file, I have a div tag: 1. I don't understand this (*) line above.

推荐答案

我真的不知道你的问题是什么样的，因为你没有用的的JavaScript 的标签，但我认为如果你明白这一点，你会问什么 google.maps.event.trigger（X，Y）一样。另外，我不知道这是什么在你的PHP文件，你的 DIV 标签来。

I don't really know what you question is about because you didn't tag it with Javascript, but I think if you knew this, you would have asked what google.maps.event.trigger(X, Y) did. Plus, I don't know what this has to do with your div tags in your PHP files.

这很简单，找出触发在这里所做的：

It's simple to find out what trigger does here:

在触发特定的事件。 eventName的之后的所有参数都作为参数传递给听众通过。

Triggers the given event. All arguments after eventName are passed as arguments to the listeners.

（从谷歌地图API ，我发现它在任何时候）

(From the Google Maps API, I found it in no time)

如果你的问题是关于整个＆放大器;＆安培; 结构，我会解释给你听：

If your question is about this whole && construct, I'll explain it to you:

map && google.maps.event.trigger(map, 'resize');

的＆放大器;＆安培; 是一个逻辑和是短cirquit评价这意味着：

The && is a logical AND with short-cirquit evaluation which means:

• 如果它的第一个参数是的真正的，它计算第二个参数。 IFF 这是的真正的也一样，它返回的真正

• If its first argument is true, it evaluates the second argument. Iff this is true too, it returns true.

如果它的第一个参数是的假的，整个前pression不能成为的真正的，所以它的甚至不评价第二个参数并返回假的马上。

If its first argument is false, the whole expression can't become true, so it doesn't even evaluate its second argument and returns false immediately.

此机制可以是（AB）用于改变流量控制。如果条件（＆放大器;＆安培; 的第一个参数）是假的，第二个参数没有得到评估，因此这是一样的。

This mechanism can be (ab)used to change flow control. If the condition (&&'s first argument) is false, the second argument doesn't get evaluated, so it's the same as

if (map) {
    google.maps.event.trigger(map, 'resize');
}

我不知道是怎么地图初始化，但也许是事件触发仅添加如果有一个地图元素。

I don't know how map was initialized, but maybe the event trigger is added only if there's a map element.

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