js对话框弹出问题

tcrct 2008-02-12 10:27:16

function createTags(){
var li = document.createElement("li");
var a = document.createElement("a");
var len = document.getElementsByTagName("a").length;
a.id = "a"+len;
a.innerText = "new tag";
a.onclick= "addTags(this)";
a.ondbclick = "removeTags(this)";
a.href="javascript:void(0)";
li.appendChild(a);
document.getElementById("tagDiv").appendChild(li);
}

function removeTags(obj){
var aid = obj.id;
alert(document.getElementById(aid));
}

这里弹出对话框,应该是弹出一个[object]才对的,但是这里弹出的对话框是javascript:void(0),我试过将a.href这段话删了,还是不能,请问这是为什么呢?如何解决这个问题.谢谢

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yixianggao 2008-02-12

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考虑到兼容性，更新一下，IE6sp1,FF2测试可用！

L@_@K

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title> new document </title>

    <meta name="generator" content="editplus" />

    <meta name="author" content="Gao YiXiang" />

    <meta name="email" content="yixianggao@126.com" />

    <meta name="keywords" content="javascript dhtml dom" />

    <meta name="description" content="I love web development." />

</head>

<body>

    <div id="tagDiv"></div>

    <script type="text/javascript">

    <!--

function createTags()

{

    var li = document.createElement("li");

    var a = document.createElement("a");

    var len = document.getElementsByTagName("a").length;

    a.id = "a"+len;

    a.innerHTML = "new tag"; // innerText 在 FF 下无效！

    // Error!

    //a.onclick = "addTags(this)";

    // Correct!

    a.ondblclick = function()

    {

        removeTags(this);

    };

    a.href = "javascript:void(0)";

    li.appendChild(a);

    document.getElementById("tagDiv").appendChild(li);

}



function removeTags(obj)

{

    alert(obj.id);

    alert(typeof obj);



    var oDiv = document.getElementById("tagDiv");

    alert(typeof oDiv);

}



createTags();

    //-->

    </script>

</body>

</html>

yixianggao 2008-02-12

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alert(document.getElementById(aid));
// 这种写法本身就有问题，要获取类型须使用typeof关键字！
// 若直接调用时会调用对象自身的toString方法，IE下一般返回[object]，而a是个特例，
// IE下a被重写了toString方法，返回的是href属性值！因此才会看到javascript:void(0)

L@_@K

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <title> new document </title>

    <meta name="generator" content="editplus" />

    <meta name="author" content="Gao YiXiang" />

    <meta name="email" content="yixianggao@126.com" />

    <meta name="keywords" content="javascript dhtml dom" />

    <meta name="description" content="I love web development." />

</head>

<body>

    <div id="tagDiv" class=""></div>

    <script type="text/javascript">

    <!--

function createTags()

{

    var li = document.createElement("li");

    var a = document.createElement("a");

    var len = document.getElementsByTagName("a").length;

    a.id = "a"+len;

    a.innerText = "new tag";

    // Error!

    //a.onclick = "addTags(this)";

    // Correct!

    a.ondblclick = function()

    {

        removeTags(this);

    };

    a.href = "javascript:void(0)";

    li.appendChild(a);

    document.getElementById("tagDiv").appendChild(li);

}



function removeTags(obj)

{

    alert(obj.id);

    alert(typeof obj);



    var oDiv = document.getElementById("tagDiv");

    alert(typeof oDiv);

}



createTags();

    //-->

    </script>

</body>

</html>