[英]javascript alert on parent page when child popup closes
I am using javascript window.open method to open lets say http://www.google.com [its always going to be some external url] 我正在使用javascript window.open方法打开,说http://www.google.com [它始终是一些外部网址]
I have stored the reference of the window object in a variable, the problem is that variable never gets null on the parent page and I am not able to alert the user that the pop up has been closed. 我已经将窗口对象的引用存储在一个变量中,问题是该变量在父页面上永远不会为空,并且我无法提醒用户弹出窗口已关闭。
Here's the code 这是代码
var winFB; var winTWt; var counterFB = 0; var counterTWT = 0; var timerFB; function openFB() { if (counterFB == 0) { winFB = window.open("http://www.google.com"); counterFB = 1; } if (counterFB > 0) { alert(winFB); if (winFB == null) { counterFB = 0; clearTimeout(timerFB); alert("Window Closed"); } } timerFB= setTimeout("openFB()", 1000); }
I can not put any javascript code on the pop up/child window. 我不能在弹出/子窗口中放置任何JavaScript代码。
Hope someone can help me on this 希望有人可以帮助我
The window variable doesn't get nulled out when it's closed, however its .closed
property is true
, so just change your check to be for that property, like this: window变量在关闭时不会消失,但是它的
.closed
属性为true
,因此只需将检查更改为该属性即可,如下所示:
var winFB;
var winTWt;
var counterFB = 0;
var counterTWT = 0;
var timerFB;
function openFB() {
if (counterFB == 0) {
winFB = window.open("http://www.google.com");
counterFB = 1;
}
if (counterFB > 0) {
if (winFB.closed) {
counterFB = 0;
clearTimeout(timerFB);
alert("Window Closed");
}
}
timerFB = setTimeout(openFB, 1000);
}
Also note the setTimeout()
change, pass a function in whenever possible (almost always ) rather than a string, you'll have a lot less problems with scoping. 还要注意
setTimeout()
更改,在任何可能的情况下(几乎总是 )而不是字符串中传递一个函数,您将在范围界定方面遇到很多麻烦。
//in the parent
winFB = window.open("http://www.google.com");
//in the child window you can access
var _parent = window.opener.document;
//also use the onunload event in the child window
onunload="doSomething()"
hope this gives you some direction.. 希望这能给您一些指导。
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