蛋糕宅配iframe的用法與註意事項－gjsdofglel

iframe的用法與註意事項

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好多同志對iframe是如何控制的,並不是十分了解,基本上還處於一個模糊的認識狀態.

注意兩個事項,ifr是一個以存在的iframe的ID和NAME值:
 document.getElementById(“ifr”);
 window.frames[“ifr”];

要想使用iframe內的函數,變量就必須通過第二種方法.因為它取的是一個完整的DOM模型(不知道這樣說對不對).第一種方法只是取出了一個OBJECT而已.

如果只想改變iframe的src或者border , scrolling等attributes(與property不是一個概念,property是不能寫在標籤內的,比如:scrollHeight,innerHTML等),就需要用到第一種方法.

如果想取得iframe的頁面(不是iframe本身),就需要使用第二種方法,因為它取得的是一個完整的DOM模型,比如想得到iframe的document.body的內容,就只能用第二種方法.

還要注意的是,如果在iframe的頁面未完全裝入的時候,調用iframe的DOM模型,會發生很嚴重的錯誤,所以,你要準備一個容錯模式.

下面是示例,一個是aa.htm,一個是bb.htm,請先考到本地在運行,原因不用我在說了吧!

aa.htm

運行代碼框

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html <a href="http://edu.mycodes.net/search.aspx?Where=title&cid=0&Keyword=xml&x=21&y=8" title="">xml</a>ns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Untitled Page</title>
<style type="text/css">
<!--
body{
margin:0px;
}
-->
</style>
</head>
<body>
<iframe id="ifr" name="ifr" width="100%" height="500" src="bb.htm"></iframe>
</body>
</html>
<script language="javascript" type="text/javascript">

var aa_value="I'm a variant in Top window!";

var ifr_id=document.getElementById("ifr");
var ifr_window=window.frames["ifr"];

alert("Alert from Top window : Can't get iframe's variant by ifr_id, it will return :" + ifr_id.bb_var);
alert("Alert from Top window : Can't get iframe's DOM model by ifr_id ,it will return :" + ifr_id.window);
alert("Alert from Top window : Get src from id :" + ifr_id.src);
alert("Alert from Top window : Get href from window:" + ifr_window.document.location.href);

//由于bb.htm可能?未??完成,所以,下冇的可能引??? 
//?用iframe?的函? ifr_window.bb();

//?用iframe?的?量
alert("Alert from Top window : " + ifr_window.bb_var);

//
alert("Alert from Top Window :" + ifr_window.document.body.innerHTML);


function aa(msg){
    alert("I'm  alerting from Top window ,and I received a msg:\n" + msg);
}
</script>

[Ctrl+A 全部?? 提示：你可先修改部分代?，再按?行]

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html <a href="http://edu.mycodes.net/search.aspx?Where=title&cid=0&Keyword=xml&x=21&y=8" title="">xml</a>ns="http://www.w3.org/1999/xhtml" >
<head>
    <title>sub frame</title>
<style type="text/css">
<!--
html,body{
margin:0px;
width:90%;
}
-->
</style>
</head>
<body>
    I'm a sub frame!
    <br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...<br />
    ...
</body>
</html>
<script language="javascript" type="text/javascript">

var bb_var="I'm a  variable in ifr";

function bb(){
    alert("Alert from iframe :I'm frame ifr's function")
}

//?取父?面的?量
alert("Alert from iframe parent.ifr_id::" + parent.ifr_id);
alert("Alert from iframe parent.aa_value : " + parent.aa_value);

//通?父?面的ifr_id?改? iframe的高度
alert("Alert from iframe : ifr's clientHeight :" +document.body.clientHeight);
parent.ifr_id.height=document.body.clientHeight;

alert("Alert from iframe : ifr's scrollHeight : " + document.body.scrollHeight);

//?用父窗体的函?:
parent.aa("I will calling a function which is Top window's ");

//改?父窗体的??:
alert("Alert from iframe : I will changing Top window's title");
top.document.title="The title value changed";

//通?父窗体的ifr_id?改?的border 与scrolling
alert("Alert from iframe : I will change my border and scrolling :");
top.ifr_id.border=0;
top.ifr_id.scrolling="no";
</script>

[Ctrl+A 全部?? 提示：你可先修改部分代?，再按?行]