How to convert xml to json in javascript

Method to convert xml to json string in javascript: first obtain the XML DOM object through the XML string or request the XML file; then obtain the nodeValue value of the sub-element through traversal and recursion; finally splice out Just a JSON string.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Use JavaScript to convert XML to JSON

First generate the XML DOM object through the XML string:

/**
 * 通过传入xml的内容字符串来解析xml
 * @param xmlString xml字符串
 * @returns xml的Document对象
 */
function getXmlDocumentByXmlString(xmlString) {
    var xmlDoc = null;
    if (window.DOMParser) {
        var parser = new DOMParser();
        xmlDoc = parser.parseFromString(xmlString, "text/xml");
    } else {
        //IE
        xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
        xmlDoc.async = "false";
        xmlDoc.loadXML(xmlString);
    }
    return xmlDoc;
}

Or by requesting the XML file Obtain the DOM object of XML:

/**
 * 通过传入xml文件路径来解析xml文档
 * @param xmlFilePath xml文档路径，如：files/test.xml
 * @returns xml的Document对象
 */
function getXmlDocumentByFilePath(xmlFilePath) {
    //xmlDocument对象
    var xmlDoc = null;
    //xmlhttp对象
    var xmlhttp = null;
    if (window.XMLHttpRequest) {
        //IE7+, FireFox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else {
        //IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlhttp.open("GET", xmlFilePath, false);
    xmlhttp.send();
    xmlDoc = xmlhttp.responseXML;
    return xmlDoc;
}

The next step is the key part. By traversing and recursively obtaining the nodeValue of the sub-element, we can splice out the JSON string and convert the XML into a JSON string:

/**
 * 将XML的Document对象转换为JSON字符串
 * @param xmlDoc xml的Document对象
 * @return string
 */
function convertToJSON(xmlDoc) {
    //准备JSON字符串和缓存（提升性能）
    var jsonStr = "";
    var buffer = new Array();

    buffer.push("{");
    //获取xml文档的所有子节点
    var nodeList = xmlDoc.childNodes;

    generate(nodeList);

    /**
     * 中间函数，用于递归解析xml文档对象，并附加到json字符串中
     * @param node_list xml文档的的nodeList
     */
    function generate(node_list) {

        for (var i = 0; i < node_list.length; i++) {
            var curr_node = node_list[i];
            //忽略子节点中的换行和空格
            if (curr_node.nodeType == 3) {
                continue;
            }
            //如果子节点还包括子节点，则继续进行遍历
            if (curr_node.childNodes.length > 1) {
                buffer.push("\"" + curr_node.nodeName + "\": {");
                generate(curr_node.childNodes);
            } else {
                var firstChild = curr_node.childNodes[0];

                if (firstChild != null) {
                    //nodeValue不为null
                    buffer.push("\"" + curr_node.nodeName + "\":\"" + firstChild.nodeValue + "\"");
                } else {
                    //nodeValue为null
                    buffer.push("\"" + curr_node.nodeName + "\":\"\"");
                }

            }
            if (i < (node_list.length - 2)) {
                buffer.push(",");
            } else {
                break;
            }
        }
        //添加末尾的"}"
        buffer.push("}");
    }

    jsonStr = buffer.join("");
    return jsonStr;
}

Usage: Obtain the XML Document object through getXmLDocumentByFilePath(xmlFilePath)or getXmlDocumentByXmlString(xmlString), and then call convertToJSON(xmlDocument )Pass in the Ducument object of xml to get the converted JSON string.

Applicable scope: Any XML document that does not contain attributes.

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