Window.open only if the window is not open

问题

I have a link on my site that opens a new window to a page that plays a very long audio file. My current script works fine to open the page and not refresh if the link is clicked multiple times. However, when I have moved to a seperate page on my site and click this link again, it reloads. I am aware that when the parent element changes, I will lose my variable and thus I will need to open the window, overiding the existing content. I am trying to find a solution around that. I would prefer not to use a cookie to achieve this, but I will if required.

My script is as follows:

function OpenWindow(){
    if(typeof(winRef) == 'undefined' || winRef.closed){
    //create new
    winRef = window.open('http://samplesite/page','winPop','sampleListOfOptions');
    } else {
    //give it focus (in case it got burried)
     winRef.focus();
    } 
}

回答1:

You should first to call winRef = window.open("", "winPopup") without URL - this will return a window, if it exists, without reloading. And only if winRef is null or empty window, then create new window.

Here is my test code:

var winRef;

function OpenWindow()
{
  if(typeof(winRef) == 'undefined' || winRef.closed)
  {
    //create new
    var url = 'http://someurl';
    winRef = window.open('', 'winPop', 'sampleListOfOptions');
    if(winRef == null || winRef.document.location.href != url)
    {
      winRef = window.open(url, 'winPop');
    }
  }
  else
  {
    //give it focus (in case it got burried)
    winRef.focus();
  } 
}

It works.

回答2:

Like you said, after navigating away from original page you're losing track of what windows you may have opened.

As far as I can tell, there's no way to "regain" reference to that particular window. You may (using cookies, server side session or whatever) know that window was opened already, but you won't ever have a direct access to it from different page (even on the same domain). This kind of communication between already opened windows may be simulated with help of ajax and server side code, that would serve as agent when sharing some information between two windows. It's not an easy nor clean solution however.

回答3:

Thanks to Stan and http://ektaraval.blogspot.ca/2011/05/how-to-set-focus-to-child-window.html

My solution creates a breakout pop-up mp3 player that remains active site wide and only refreshes if the window is not open prior to clicking the link button

function OpenWindow(){
    var targetWin = window.open('','winPop', 'sample-options');
    if(targetWin.location == 'about:blank'){
        //create new
        targetWin.location.href = 'http://site/megaplayer';
        targetWin.focus();
    } else {
        //give it focus (in case it got burried)
        targetWin.focus();
    } 
}

来源：https://stackoverflow.com/questions/13411960/window-open-only-if-the-window-is-not-open

标签

javascript

window.open