使用JavaScript更改XML内容，缺少刷新

Change XML content using JavaScript, missing refresh

本文关键字：刷新 内容 JavaScript 更改 XML 使用      更新时间：2023-09-26

我设法使用-

显示XML
wxml = window.open("my_template.xml", "my_xml" );

我设法改变DOM使用-

xDoc = wxml.document;
xNodes = xExDoc.getElementsByTagName("myNodeName");  
xValue = xNodes[i].getElementsByTagName("value")[0];
xValue.firstChild.nodeValue = nodeNewVal;

但是我无法在屏幕上看到新的DOM值

如何强制"刷新屏幕的DOM"

注意:reload()没有帮助，因为它加载的是原始页面，而我想看到的是DOM改变后的页面。

编辑-我使用的代码:

XML文件(my_template.xml): 
<myXmlRoot>
<device>
  <input><name>"name 1"</name><value>{replaceMe!}</value></input>
  <input><name>"name 2"</name><value>{replaceMe!}</value></input>  
</device>
<device>
  <input><name>"name 1"</name><value>{replaceMe!}</value></input>
  <input><name>"name 2"</name><value>{replaceMe!}</value></input>  
</device>
<device>
  <input><name>"name 1"</name><value>{replaceMe!}</value></input>
  <input><name>"name 2"</name><value>{replaceMe!}</value></input>  
</device>
</myXmlRoot>
HTML文件:

<html>
<head>
<title>Open XML in External Window</title>
</head>
<body>
<button onClick="fShowXmlInExternalWin()">Show XML </button> (does not show the updated version on the screen)
<script type="text/javascript" >
var wxml;
var xDoc;
var xDevices, xInputs;
var xDevice, xInput;
    function fSetXmlAInput(iDevice, iNode, nodeNewVal) {
      xInput = xInputs[iNode];
      xValue = xInput.getElementsByTagName("value")[0];
      // change node value:
      // console.log("nodeVal: " + xValue.firstChild.nodeValue);
      xValue.firstChild.nodeValue = nodeNewVal;
      // console.log("newVal: " + xValue.firstChild.nodeValue);
    }
    function fSetXmlDevice(iDevice) {
      xDevice = xDevices[iDevice];
      xInputs = xDevice.getElementsByTagName("input");
        fSetXmlAInput(iDevice, 0, "22");
        fSetXmlAInput(iDevice, 1, "33");
    }
    function fShowXmlInExternalWin() {
      wxml = window.open("my_template.xml", "my_xml" );
      xDoc = wxml.document;
      xDevices = xDoc.getElementsByTagName("device");
      fSetXmlDevice(1);
      return false;
    }
</script>
</body>
</html>

第一次查看时出现以下错误:

Timestamp: 6/5/2013 2:32:11 μμ
Error: ReferenceError: xExDoc is not defined

我没有看到xExDoc定义在你的代码某处…我只看到xDoc。

更新:

另外，变量i没有定义，导致另一个错误。此外，应该使用firebug一步一步地调试代码，或者至少添加

alert(xNodes.length);

，以便检查找到了多少个标签。

更新2:(包含解决方案)

我发现了两个可能的选择:

  1. 使用窗口。open with data:text/xml直接呈现修改后的xml。
  2. 使用appendChild和removeChild强制对XML DOM进行重大更改，并使浏览器重新刷新页面。

选项1保持XML浏览器格式完整，而选项2导致浏览器不再将XML视为XML内容，并且格式丢失。

代码如下:

<html>
<head>
<title>Open XML in External Window</title>
</head>
<body>
<button onClick="fShowXmlInExternalWin()">Show XML </button> (shows updated on the screen but loses XML formatting)<br/>
<button onClick="alternativeLoadXML()">Alternative Show XML </button> (shows updated XML, as XML is loaded - changed, and XML is rendered)<br/>
<button onClick="alternativeLoadXML2()">Alternative Show XML 2  </button> (open window with original XML, change XML model, reload window)<br/>
<script type="text/javascript" >
var wxml;
var xDoc;
var xDevices, xInputs;
var xDevice, xInput;
    function fSetXmlAInput(iDevice, iNode, nodeNewVal) {
      xInput = xInputs[iNode];
      xValue = xInput.getElementsByTagName("value")[0];
      // change node value:
      // console.log("nodeVal: " + xValue.firstChild.nodeValue);
      xValue.firstChild.nodeValue = nodeNewVal;
      // console.log("newVal: " + xValue.firstChild.nodeValue);
    }
    function fSetXmlDevice(iDevice) {
      xDevice = xDevices[iDevice];
      xInputs = xDevice.getElementsByTagName("input");
        fSetXmlAInput(iDevice, 0, "22");
        fSetXmlAInput(iDevice, 1, "33");
    }
    function fShowXmlInExternalWin() {
      wxml = window.open("my_template.xml", "my_xml" );
      //Delay 500ms for window to load first
      window.setTimeout("triggerWindow()",500);
      return false;
    }
    //Further options Below 
    //First option, trigger refresh with append and remove - loses formatting
    function triggerWindow()
    {
        xDoc = wxml.document;
        xDevices = xDoc.getElementsByTagName("device");
        fSetXmlDevice(1);
        //Add and remove element to trigger referesh
        var p = document.createElement("test");
        xDoc.firstChild.appendChild(p);
        xDoc.firstChild.removeChild(p);
    }
    function alternativeLoadXML()
    {
        // load xml file
        if (window.XMLHttpRequest) {
           xhttp = new XMLHttpRequest();
        } else {    // IE 5/6
           xhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xhttp.open("GET", "my_template.xml", false);
        xhttp.send();
        xDoc = xhttp.responseXML; 
        xDevices = xDoc.getElementsByTagName("device");
        fSetXmlDevice(1);
        var xmlText = new XMLSerializer().serializeToString(xDoc);      
        window.open('data:text/xml,' +  xmlText);
    }

    //Second option, open window, change XML, reload window with custom xml address
    function triggerWindow2()
    {
        xDoc = wxml.document;
        xDevices = xDoc.getElementsByTagName("device");
        fSetXmlDevice(1);
        var xmlText = new XMLSerializer().serializeToString(xDoc);      
        window.open('data:text/xml,' +  xmlText, "my_xml");
    }
    function alternativeLoadXML2()
    {
        wxml = window.open("my_template.xml", "my_xml" );
        //Delay 500ms for window to load first
        window.setTimeout("triggerWindow2()",500);
    }   
</script>
</body>
</html>
更新3:

使用文档。打开并归档。写在新窗口上的工作在IE中输出正确的XML，但XML渲染是关闭的-似乎渲染内容为HTML…

function alternativeLoadXML3() {
        // load xml file
        if (window.XMLHttpRequest) {
            xhttp = new XMLHttpRequest();
        } else { // IE 5/6
            xhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xhttp.open("GET", "my_template.xml", false);
        xhttp.send();
        xDoc = xhttp.responseXML;
        xDevices = xDoc.getElementsByTagName("device");
        fSetXmlDevice(1);
        var xmlText = serializeXmlNode(xDoc);
        var newWindow = window.open("my_template.xml", "Test", "width=300,height=300,scrollbars=1,resizable=1");
        newWindow.document.open();
        newWindow.document.write(xmlText);
        newWindow.document.close()
    };
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