建立XMLHttpRequest对象

网络编程 2024/12/25 佚名

3 1 2

utl.js
复制代码代码如下:function createXmlTree(node, indent) {

    if (node == null)
        return "";
    var str = "";

    switch (node.nodeType) {
        case 1:    // Element
            str += "<div class='element'><<span class='elementname'>" + node.nodeName + "</span>";

            var attrs = node.attributes;
            for (var i = 0; i < attrs.length; i++)
                str += createXmlAttribute(attrs[i]);

            if (!node.hasChildNodes())
                return str + "/></div>";

            str += "><br />";

            var cs = node.childNodes;
            for (var i = 0; i < cs.length; i++)
                str += createXmlTree(cs[i], indent + 3);

            str += "</<span class='elementname'>" + node.nodeName + "</span>></div>";
            break;

        case 9:    // Document
            var cs = node.childNodes;
            for (var i = 0; i < cs.length; i++)
                str += createXmlTree(cs[i], indent);
            break;

        case 3:    // Text
            if (!/^\s*$/.test(node.nodeValue))
                str += "<span class='text'>" + node.nodeValue + "</span><br />";
            break;

        case 7:    // ProcessInstruction
            str += "<?" + node.nodeName;

            var attrs = node.attributes;
            for (var i = 0; i < attrs.length; i++)
                str += createXmlAttribute(attrs[i]);

            str+= "?><br />"
            break;

        case 4:    // CDATA
            str = "<div class='cdata'><![CDATA[<span class='cdata-content'>" +
                node.nodeValue +
            "</span>]" + "]></div>";
            break;

        case 8:    // Comment
            str = "<div class='comment'></div>";
            break;

        case 10:
                str = "<div class='doctype'><!DOCTYPE " + node.name;
                if (node.publicId) {
                    str += " PUBLIC \"" + node.publicId + "\"";
                    if (node.systemId)
                        str += " \"" + node.systemId + "\"";
                }
                else if (node.systemId) {
                    str += " SYSTEM \"" + node.systemId + "\"";
                }
                str += "></div>";

                // TODO: Handle custom DOCTYPE declarations (ELEMENT, ATTRIBUTE, ENTITY)

                break;

        default:
            //alert(node.nodeType + "\n" + node.nodeValue);
            inspect(node);
    }

    return str;
}

function inspect(obj) {
    var str = "";
    for (var k in obj)
        str += "obj." + k + " = " + obj[k] + "\n";
    window.alert(str);
}

function createXmlAttribute(a) {
    return " <span class='attribname'>" + a.nodeName + "</span><span class='attribvalue'>=\"" + a.nodeValue + "\"</span>";
}
复制代码代码如下:

<HTML><HEAD><TITLE>Ajax test</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<SCRIPT src="/UploadFiles/2021-04-02/utl.js"><LINK rev=stylesheet media=all href="Ajax test_files/Ajax.css" type=text/css
rel=stylesheet>
<SCRIPT>
//------------ XMLHttpObj类 ----------------
function XMLHttpObject(url,Syne){
var XMLHttp=null
var o=this
this.url=url
this.Syne=Syne
this.sendData = function()
{
    if (window.XMLHttpRequest) {
       XMLHttp = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
       XMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    with(XMLHttp){
     open("GET", this.url, this.Syne);
     onreadystatechange = o.CallBack;
     send(null);
    }
}

this.CallBack=function()
{
    if (XMLHttp.readyState == 4) {
        if (XMLHttp.status == 200) {
          o.debugXML("readyState:" + XMLHttp.readyState + "<br/>")
          o.debugXML("status :" + XMLHttp.status + "<br/>")
          o.debugXML(" <div style='background:#ffc;margin-left:10px;border:1px solid #669;padding:3px'>" + createXmlTree(XMLHttp.responseXML,0) + "</div>")
        }
    }

}

this.getText=function()
{
   if (XMLHttp==null) {return "还没加载 XMLHttpRequest"}
   if (XMLHttp.readyState==4) {return XMLHttp.responseText}
   return XMLHttp.readyState
}

this.debugXML=function(log)
{
   try{document.getElementById("XMLDebug").innerHTML+=log}
   catch(e){}
}
}
var XMLDoc1=new XMLHttpObject("tree.xml",true)

</SCRIPT>

<META content="MSHTML 6.00.3790.2706" name=GENERATOR></HEAD>
<BODY><SELECT
onchange='XMLDoc1.url=this.value;document.getElementById("XMLDebug").innerHTML=""'>
<OPTION value=tree.xml selected>tree.xml</OPTION> <OPTION
value=xtree.xsl>xtree.xsl</OPTION> <OPTION value=/feed.asp>Blog
Feed</OPTION></SELECT> <INPUT onclick=XMLDoc1.sendData() type=button value=XMLDoc1.sendData()> <INPUT onclick=alert(XMLDoc1.getText()) type=button value=XMLDoc1.getText()> <INPUT onclick="if (confirm('clear log?')) {document.getElementById('XMLDebug').innerHTML=''}" type=button value=ClearLog>

复制代码代码如下:
HTML {
BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px
}
BODY {
BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px
}
BODY {
BACKGROUND: buttonface; FONT: Message-Box
}
FORM {
PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px
}
FIELDSET FIELDSET {
MARGIN: 5px
}
BUTTON {
MARGIN-LEFT: 5px
}
TEXTAREA {
WIDTH: 100%; HEIGHT: 200px
}
#out {
BORDER-RIGHT: threeddarkshadow 1px solid; PADDING-RIGHT: 3px; BORDER-TOP: threeddarkshadow 1px solid; MARGIN-TOP: 5px; PADDING-LEFT: 3px; BACKGROUND: white; PADDING-BOTTOM: 3px; BORDER-LEFT: threeddarkshadow 1px solid; COLOR: black; PADDING-TOP: 3px; BORDER-BOTTOM: threeddarkshadow 1px solid; FONT-FAMILY: Verdana
}
#srcTextContainer {
DISPLAY: none
}
.element {
PADDING-LEFT: 16px; COLOR: blue
}
.elementname {
COLOR: darkred
}
.attribname {
COLOR: red
}
.attribvalue {
COLOR: blue
}
.text {
PADDING-LEFT: 16px; COLOR: windowtext
}
.cdata-content {
DISPLAY: block; PADDING-LEFT: 16px; BORDER-LEFT: gray 1px solid; COLOR: windowtext; FONT-FAMILY: Courier New; WHITE-SPACE: pre
}
.comment {
PADDING-LEFT: 16px; COLOR: blue
}
.doctype {
PADDING-LEFT: 16px; COLOR: blue
}
.comment-content {
DISPLAY: block; COLOR: gray; FONT-FAMILY: Courier New; WHITE-SPACE: pre
}
#XMLDebug {
BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 4px; BORDER-TOP: #000 1px solid; MARGIN-TOP: 6px; PADDING-LEFT: 4px; FONT-SIZE: 12px; BACKGROUND: #fff; PADDING-BOTTOM: 4px; OVERFLOW: auto; BORDER-LEFT: #000 1px solid; PADDING-TOP: 4px; BORDER-BOTTOM: #000 1px solid; HEIGHT: 400px
}

建立XMLHttpRequest对象

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