window.open之postMessage传参数

这次要实现一个window.open打开子视窗的同时传参数到子视窗,关闭的时候返回参数。

当然简单的做法非常简单,直接在window.open的URL之后接参数即可,但是毕竟get method的参数长度受浏览器的限制,一般从2KB到8KB。

除了get之外,还可以用window.postMessage(), 参考下面的case演示。

主视窗HTML如下:

 1 <!DOCTYPE html>
 2 <html>
 3 <head>
 4 <meta charset="UTF-8">
 5 <title>Insert title here</title>
 6 <script src="js/jquery-3.1.1.min.js" type="text/javascript"></script>
 7 <script type="text/javascript">
 8 
 9         function openWin() {
10             var params = new Array();
11             params[0] = new Array("CL1", "milo test");
12             params[1] = new Array("CL2", "Taipei");
13             
14             var popupwin = window.open("popup.jsp", "Map", "status=0,title=0,height=600,width=800,scrollbars=1");
15             //onload只能执行一次,也就是如果子窗口有onload事件,可能会覆盖。
16             popupwin.onload = function(e){
17                 popupwin.postMessage(params, "http://"+window.location.host);
18             }
19             popupwin.onunload = function(e){
20                 var val = popupwin.returnValue;
21                 alert(val);
22             }
23         }
24 
25     </script>
26 </head>
27 <body>
28 <input type="button" value="Open Window" onclick="openWin()" />
29 </body>
30 </html>

打开子视窗之后,要给视窗传参数params,并在子视窗上显示出参数值。

但前提是子视窗必须已经完成监听事件message的填加,否则onload的时候参数传过去也收不到。为了解决这个问题,子视窗必须要在onload事件执行之前添加message事件监听。这里我是添加document.onreadystatechange事件,先看看html的document.readyState, 总的有五个取值:

  • uninitialized - Has not started loading yet
  • loading - Is loading
  • loaded - Has been loaded
  • interactive - Has loaded enough and the user can interact with it
  • complete - Fully loaded

为了在onload被fired之前且安全的添加window事件,这里选择用complete,DOC全部加载完且还未触发onload。

子视窗参考如下:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>popup window</title>
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<script language="javascript" type="text/javascript">
    function closeWin() {
        window.returnValue = true;
        window.close();
    }
    //HTML DOM fully loaded, and fired window.onload later. 
    document.onreadystatechange = function(e)
    {
        if (document.readyState === 'complete')
        {
            window.addEventListener('message', function(e){
                var params = e.data;
                $('#cl1').text(params[0][1]);
                $('#cl2').text(params[1][1]);
            });
        } 
    };
</script>
</head>
<body>
Parameter CL1: <b id="cl1"></b>
Parameter CL2: <b id="cl2"></b>
<div><input type="button" value="Return Value" onclick="closeWin()" /></div>
</body>
</html>

运行结果:

 

posted @ 2017-03-17 22:36  lzone6  阅读(13429)  评论(0编辑  收藏  举报