我正在使用JavaScript创建一个网页来创建一个表，该表对于XML文件中的每个节点都有一个单独的行（注意：我无法使用XSL / XSLT修改XML文件原因）。
<script>
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
var xmlhttp = new XMLHttpRequest();
} else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET", "Books.xml", false);
xmlhttp.send();
xmlDoc = xmlhttp.responseXML;
document.write("<table id=name border='1'>");
document.write("<tr><th>Book Name</th><th>Book Price</th><th>Book Author</th><th>Book Comments</th></tr>"); document.write("<tr>");
我的问题是XML文件有一组不同的childNodes，具体取决于任何特定书籍的可用内容，例如 -
<Book>
<BookName>Cooking Today</BookName>
<BookPrice>$6.99</BookPrice>
</Book>
<Book>
<BookName>How To Make It</BookName>
<BookPrice>$7.99</BookPrice>
<BookAuthor>Gary Shaw</BookAuthor>
<BookComments>OMG, it changed my life</BookComments>
</Book>
我创建的表格中包含每个字段所需的所有列名称，但是因为每本书都有不同的childNodes，所以每行中这些值的位置都不匹配到相应的列
当特定字段不可用时，是否有办法让此脚本输入空白/空/空值（例如，在上面的示例中，我想在表格中留一个空格这本书，＆＃39;今日烹饪＆＃39;为缺少的领域 - 书作者，书评？）
答案 0 :(得分：0)
如果您知道每个节点，那么您可以定义对象的所有变量，对吧？然后在尝试执行XML阅读器之前执行此操作。我建议：
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/92/three.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - equirectangular panorama</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<style>
body {
background-color: #000000;
margin: 0px;
overflow: hidden;
}
#info {
position: absolute;
top: 0px; width: 100%;
color: #ffffff;
padding: 5px;
font-family:Monospace;
font-size:13px;
font-weight: bold;
text-align:center;
}
a {
color: #ffffff;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="info">
<a href="http://threejs.org" target="_blank" rel="noopener">three.js webgl</a> - equirectangular panorama demo. photo by <a href="http://www.flickr.com/photos/jonragnarsson/2294472375/" target="_blank" rel="noopener">Jón Ragnarsson</a>.<br />
drag equirectangular texture into the page.
</div>
<script>
var camera, scene, renderer;
var isUserInteracting = false,
onMouseDownMouseX = 0, onMouseDownMouseY = 0,
lon = 0, onMouseDownLon = 0,
lat = 0, onMouseDownLat = 0,
phi = 0, theta = 0;
init();
animate();
function init() {
var container, mesh;
container = document.getElementById( 'container' );
camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, 1100 );
camera.target = new THREE.Vector3( 0, 0, 0 );
scene = new THREE.Scene();
var geometry = new THREE.SphereBufferGeometry( 500, 60, 40 );
// invert the geometry on the x-axis so that all of the faces point inward
geometry.scale( - 1, 1, 1 );
var material = new THREE.MeshBasicMaterial( {
map: new THREE.TextureLoader().load( 'https://farm4.staticflickr.com/3289/2294472375_24a3b8ef46_o.jpg' )
} );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
document.addEventListener( 'mousedown', onDocumentMouseDown, false );
document.addEventListener( 'mousemove', onDocumentMouseMove, false );
document.addEventListener( 'mouseup', onDocumentMouseUp, false );
document.addEventListener( 'wheel', onDocumentMouseWheel, false );
//
document.addEventListener( 'dragover', function ( event ) {
event.preventDefault();
event.dataTransfer.dropEffect = 'copy';
}, false );
document.addEventListener( 'dragenter', function ( event ) {
document.body.style.opacity = 0.5;
}, false );
document.addEventListener( 'dragleave', function ( event ) {
document.body.style.opacity = 1;
}, false );
document.addEventListener( 'drop', function ( event ) {
event.preventDefault();
var reader = new FileReader();
reader.addEventListener( 'load', function ( event ) {
material.map.image.src = event.target.result;
material.map.needsUpdate = true;
}, false );
reader.readAsDataURL( event.dataTransfer.files[ 0 ] );
document.body.style.opacity = 1;
}, false );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function onDocumentMouseDown( event ) {
event.preventDefault();
isUserInteracting = true;
onMouseDownMouseX = event.clientX;
onMouseDownMouseY = event.clientY;
onMouseDownLon = lon;
onMouseDownLat = lat;
}
function onDocumentMouseMove( event ) {
if ( isUserInteracting === true ) {
lon = ( onMouseDownMouseX - event.clientX ) * 0.1 + onMouseDownLon;
lat = ( event.clientY - onMouseDownMouseY ) * 0.1 + onMouseDownLat;
}
}
function onDocumentMouseUp( event ) {
isUserInteracting = false;
}
function onDocumentMouseWheel( event ) {
var fov = camera.fov + event.deltaY * 0.05;
camera.fov = THREE.Math.clamp( fov, 10, 75 );
camera.updateProjectionMatrix();
}
function animate() {
requestAnimationFrame( animate );
update();
}
function update() {
if ( isUserInteracting === false ) {
lon += 0.1;
}
lat = Math.max( - 85, Math.min( 85, lat ) );
phi = THREE.Math.degToRad( 90 - lat );
theta = THREE.Math.degToRad( lon );
camera.target.x = 500 * Math.sin( phi ) * Math.cos( theta );
//camera.target.y = 500 * Math.cos( phi ); // comment this to disable Y axis
camera.target.z = 500 * Math.sin( phi ) * Math.sin( theta );
camera.lookAt( camera.target );
/*
// distortion
camera.position.copy( camera.target ).negate();
*/
renderer.render( scene, camera );
}
</script>
</body>
</html>所以现在你有一些神奇的东西可以给你一个HTML Table Row。例如：
function Book() {
this.importableVariables = ['bookName', 'bookPrice', 'bookAuthor', 'bookComments'];
}
Book.prototype.toRow = function() {
var output = '<tr>';
for (var x in this.importableVariables) {
var vName = this.importableVariables[x];
output += '<td>' + this[vName] + '</td>';
}
output += '</tr>';
return output;
}
这不是什么大问题。您可以更好地学习here。我只做例子。 就我而言，我想分两步来分割这一步。
这里我不在乎我在字符串中读到什么。我将在var book = new Book();
yourTableBodyJqueryRefference.append(book.toRow());
上查找Book构造函数中列出的变量。因此，如果它存在，我们应该将该值导入我们的对象。
importableVariables现在我们将做出最后的魔力。一种读取整个XML并拆分为N Book实例的函数。
Book.prototype.instanceFromXML = function(str) {
var parser, doc;
if(window.DOMParser) {
parser = new DOMParser();
doc = parser.parseFromString(str,"text/xml");
} else {
doc = new ActiveXObject("Microsoft.XMLDOM");
doc.async = false;
doc.loadXML(str);
}
for (var x in this.importableVariables) {
var vName = this.importableVariables[x];
var value = doc.getElementsByTagName(vName);
this[vName] = value.length > 0 ? value[0].childNodes[0].nodeValue : '';
}
}
最后的电话：
function readXML(str) {
var parser, doc;
if(window.DOMParser) {
parser = new DOMParser();
doc = parser.parseFromString(str,"text/xml");
} else {
doc = new ActiveXObject("Microsoft.XMLDOM");
doc.async = false;
doc.loadXML(str);
}
var xmlBooks = doc.getElementsByTagName("Book"), books = '';
for (var i = 0; i < xmlBooks.length; i++) {
var book = new Book();
book.instanceFromXML(xmlBooks[i].childNodes[0].nodeValue);
books += book.toRow();
}
return books;
}