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:

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 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:

XML-Code:

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