如何使用 Javascript 在 HTML 文件中显示 XML 内容

Question

这是我的 xml 代码。 我想用 Javascript 在 html 页面中显示内容。

<businesses>
    <business bfsId="" id="41481">
        <advertHeader>Welding Supplies, Equipment and Service Business</advertHeader>
        <Price>265000</Price>
        <catalogueDescription>Extremely profitable (Sales £500k, GP £182k) business</catalogueDescription>
        <keyfeature1>
        Well established 25 year business with excellent trading record
        </keyfeature1>
        <keyfeature2>
        Consistently high levels of turnover and profitability over last 5 years
        </keyfeature2>
    </business>
    <business bfsId="" id="42701">
        <broker bfsRef="1771" ref="003">Birmingham South, Wolverhampton &amp; West Midlands</broker>
        <tenure>freehold</tenure>
        <advertHeader>Prestigious Serviced Office Business</advertHeader>
        <Price>1200000</Price>
        <reasonForSale>This is a genuine retirement sale.</reasonForSale>
        <turnoverperiod>Annual</turnoverperiod>
        <established>28</established>
        <catalogueDescription>This well-located and long-established serviced office</catalogueDescription>
        <underOffer>No</underOffer>
        <image1>https://www.business-partnership.com/uploads/business/businessimg15977.jpg</image1>
        <keyfeature1>other connections</keyfeature1>
        <keyfeature2> Investment Opportunity</keyfeature2>
        <keyfeature3>Over 6,000 sq.ft.</keyfeature3>
        <keyfeature4>Well-maintained </keyfeature4>
        <keyfeature5>In-house services &amp; IT provided</keyfeature5>
    </business>
</businesses>

这是原始 xml 文件https://alpha.business-sale.com/bfs.xml我刚刚用了一小部分来描述情况。

要求

• 为每个<business>元素打印一行
• 对于每个<business>选择一些特定的子元素并仅为这些元素打印列。（不是全部）。 对于这种情况下的示例，我只想打印<advertHeader>的值； <Price>和<description>并希望忽略其他元素。
• 只打印那些<business>其中<Price>值为 > 10000 的行。 如果小于 10000 则不打印该行
• 每 10 行后分页

这是html表

<table id="MainTable"><tbody id="BodyRows"></tbody></table>

这是我尝试过的 javascript 代码。

window.addEventListener("load", function() {
            getRows();
        });

        function getRows() {
            var xmlhttp = new XMLHttpRequest();
            xmlhttp.open("get", "2l.xml", true);
            xmlhttp.onreadystatechange = function() {
                if (this.readyState == 4 && this.status == 200) {
                    showResult(this);
                }
            };
            xmlhttp.send(null);
        }

        function showResult(xmlhttp) {
            var xmlDoc = xmlhttp.responseXML.documentElement;
            removeWhitespace(xmlDoc);
            var outputResult = document.getElementById("BodyRows");
            var rowData = xmlDoc.getElementsByTagName("business");

            addTableRowsFromXmlDoc(rowData,outputResult);
        }

        function addTableRowsFromXmlDoc(xmlNodes,tableNode) {
            var theTable = tableNode.parentNode;
            var newRow, newCell, i;
            console.log ("Number of nodes: " + xmlNodes.length);
            for (i=0; i<xmlNodes.length; i++) {
                newRow = tableNode.insertRow(i);
                newRow.className = (i%2) ? "OddRow" : "EvenRow";
                for (j=0; j<xmlNodes[i].childNodes.length; j++) {
                    newCell = newRow.insertCell(newRow.cells.length);

                    if (xmlNodes[i].childNodes[j].firstChild) {
                        newCell.innerHTML = xmlNodes[i].childNodes[j].firstChild.nodeValue;
                    } else {
                        newCell.innerHTML = "-";
                    }
                    console.log("cell: " + newCell);

                }
                }
                theTable.appendChild(tableNode);
        }

        function removeWhitespace(xml) {
            var loopIndex;
            for (loopIndex = 0; loopIndex < xml.childNodes.length; loopIndex++)
            {
                var currentNode = xml.childNodes[loopIndex];
                if (currentNode.nodeType == 1)
                {
                    removeWhitespace(currentNode);
                }
                if (!(/\S/.test(currentNode.nodeValue)) && (currentNode.nodeType == 3))
                {
                    xml.removeChild(xml.childNodes[loopIndex--]);
                }
            }
        }

但是此代码打印<business>元素下所有节点的列。 并且<business>下的子元素数量不同。 所以结果是这样的

我不想要那个。 我只想显示<business>元素下特定节点的值（在这种情况下只包括<advertHeader> ; <Price>和<description> ），以便每行的列数相等。 怎么做？

Answer 1

尝试找到具有最多值的<business>元素并围绕它构建表格。 这是一个示例代码段，它为您提供的数据执行此操作。

 { const xml = new DOMParser() .parseFromString(getData(), `text/xml`); // the <business>-elements from xml const businessElems = [...xml.querySelectorAll(`business`)]; // the nodeNames will be the header. While we're at it, // we can count the number of headers (len) for later use const headersFromXml = businessElems.map( v => [...v.querySelectorAll(`*`)] .map( v => v.nodeName) ) .map( v => ( {len: v.length, headers: v} ) ); // now determine the longest header using a reducer const businessElemWithMostNodes = headersFromXml .reduce( (acc, v) => v.len > acc.len ? v : acc, {len: 0}); // utility to create a tablecell/header and append it to a row const createCell = (rowToAppendTo, cellType, value) => { const cell = document.createElement(cellType); cell.innerHTML = value; rowToAppendTo.appendChild(cell); } // utility to create a datarow and append it to a table const createDataRow = (tableToAppendTo, businessElem) => { const row = document.createElement(`tr`); const rowValues = []; // create values using the businessElemWithMostNodes order businessElemWithMostNodes.headers .forEach( head => { const valueElem = businessElem.querySelector(`${head}`); rowValues.push(valueElem ? valueElem.innerHTML : `-`); }); rowValues.forEach( v => createCell(row, `td`, v) ); tableToAppendTo.appendChild(row); }; // now we know enough to create the table const table = document.createElement(`table`); // the headerRow first const headRow = document.createElement(`tr`); businessElemWithMostNodes.headers.forEach( hv => createCell(headRow, `th`, hv) ); table.appendChild(headRow); // next create and append the rows businessElems.forEach(be => createDataRow(table, be)); // finally, append the table to document.body document.body.appendChild(table); // your xml string function getData() { return ` <businesses> <business bfsId="" id="41481"> <advertHeader>Welding Supplies, Equipment and Service Business</advertHeader> <Price>265000</Price> <catalogueDescription>Extremely profitable (Sales £500k, GP £182k) business</catalogueDescription> <keyfeature1> Well established 25 year business with excellent trading record </keyfeature1> <keyfeature2> Consistently high levels of turnover and profitability over last 5 years </keyfeature2> </business> <business bfsId="" id="42701"> <broker bfsRef="1771" ref="003">Birmingham South, Wolverhampton &amp; West Midlands</broker> <tenure>freehold</tenure> <advertHeader>Prestigious Serviced Office Business</advertHeader> <Price>1200000</Price> <reasonForSale>This is a genuine retirement sale.</reasonForSale> <turnoverperiod>Annual</turnoverperiod> <established>28</established> <catalogueDescription>This well-located and long-established serviced office</catalogueDescription> <underOffer>No</underOffer> <image1>https://www.business-partnership.com/uploads/business/businessimg15977.jpg</image1> <keyfeature1>other connections</keyfeature1> <keyfeature2> Investment Opportunity</keyfeature2> <keyfeature3>Over 6,000 sq.ft.</keyfeature3> <keyfeature4>Well-maintained </keyfeature4> <keyfeature5>In-house services &amp; IT provided</keyfeature5> </business> </businesses>`; } }

 body { margin: 1rem; font: 12px/15px normal consolas, verdana, arial; } .hidden { display: none; } th { background-color: black; color: white; border: 1px solid transparent; padding: 2px; text-align: left; } td { border: 1px solid #c0c0c0; padding: 2px; vertical-align: top; }