原文:刘武|Javascript怎么在两个窗体之间传值
众所周知window.open() 函数可以用来打开一个新窗口,那么如何在子窗体中向父窗体传值呢,其实通过window.opener即可获取父窗体的引用。
如我们新建窗体FatherPage.htm:
</>code
- <script type="text/javascript">
- function OpenChildWindow()
- {
- window.open('ChildPage.htm');
- }
- </script>
- <input type="text" id="txtInput" />
- <input type="button" value="OpenChild" onclick="OpenChildWindow()" />
然后在ChildPage.htm中即可通过window.opener来访问父窗体中的元素:
</>code
- <script type="text/javascript">
- function SetValue()
- {
- window.opener.document.getElementById('txtInput').value
- =document.getElementById('txtInput').value;
- window.close();
- }
- </script>
- <input type="text" id="txtInput" />
- <input type="button" value="SetFather" onclick="SetValue()" />
其实在打开子窗体的同时,我们也可以对子窗体的元素进行赋值,因为window.open函数同样会返回一个子窗体的引用,因此FatherPage.htm可以修改为:
</>code
- <script type="text/javascript">
- function OpenChildWindow()
- {
- var child = window.open('ChildPage.htm');
- child.document.getElementById('txtInput').value
- =document.getElementById('txtInput').value;
- }
- </script>
- <input type="text" id="txtInput" />
- <input type="button" value="OpenChild" onclick="OpenChildWindow()" />
通过判断子窗体的引用是否为空,我们还可以控制使其只能打开一个子窗体:
</>code
- <script type="text/javascript">
- var child
- function OpenChildWindow()
- {
- if(!child)
- child = window.open('ChildPage.htm');
- child.document.getElementById('txtInput').value
- =document.getElementById('txtInput').value;
- }
- </script>
- <input type="text" id="txtInput" />
- <input type="button" value="OpenChild" onclick="OpenChildWindow()" />
光这样还不够,当关闭子窗体时还必须对父窗体的child变量进行清空,否则打开子窗体后再关闭就无法再重新打开了:
</>code
- <body onunload="Unload()">
- <script type="text/javascript">
- function SetValue()
- {
- window.opener.document.getElementById('txtInput').value
- =document.getElementById('txtInput').value;
- window.close();
- }
- function Unload()
- {
- window.opener.child=null;
- }
- </script>
- <input type="text" id="txtInput" />
- <input type="button" value="SetFather" onclick="SetValue()" />
- </body>
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