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:
XML-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:
XML-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:
XML-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:
XML-Code:
<script type="text/javascript">
var childfunction 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:
XML-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>