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该博客演示了一个使用SheetJS库和canvas-datagrid组件来处理Excel文件的实时预览和导出功能。用户可以拖放Excel文件到网页上,数据将被解析并显示在canvas-datagrid中。此外,还提供了导出为XLSX文件的功能。源代码和问题报告链接也在页面中给出。 摘要由CSDN通过智能技术生成
<!DOCTYPE html>
<!-- xlsx.js (C) 2013-present  SheetJS http://sheetjs.com -->
<!-- vim: set ts=2: -->
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>SheetJS + canvas-datagrid Live Demo</title>
<style>
#drop{
	border:2px dashed #bbb;
	-moz-border-radius:5px;
	-webkit-border-radius:5px;
	border-radius:5px;
	padding:25px;
	text-align:center;
	font:20pt bold,"Vollkorn";color:#bbb
#b64data{
	width:100%;
a { text-decoration: none }
</style>
</head>
<b><a href="http://sheetjs.com">SheetJS Data Preview Live Demo</a></b>
<a href="https://github.com/TonyGermaneri/canvas-datagrid">canvas-datagrid component library</a>
<a href="https://github.com/SheetJS/js-xlsx">Source Code Repo</a>
<a href="https://github.com/SheetJS/js-xlsx/issues">Issues?  Something look weird?  Click here and report an issue</a>
<div id="drop">Drop a spreadsheet file here to see sheet data</div>
<input type="file" name="xlfile" id="xlf" /> ... or click here to select a file
<textarea id="b64data">... or paste a base64-encoding here</textarea>
<b>Advanced Demo Options:</b>
<p><input type="submit" value="Export to XLSX!" id="xport" onclick="export_xlsx();" disabled="true"></p>
<div id="htmlout"></div>
<script src="https://unpkg.com/canvas-datagrid/dist/canvas-datagrid.js"></script>
<script src="shim.js"></script>
<script src="xlsx.full.min.js"></script>
<script>
/*jshint browser:true */
/* eslint-env browser */
/* eslint no-use-before-define:0 */
/*global Uint8Array, Uint16Array, ArrayBuffer */
/*global XLSX */
var cDg;
var process_wb = (function() {
	var XPORT = document.getElementById('xport');
	var HTMLOUT = document.getElementById('htmlout');
	return function process_wb(wb) {
		/* get data */
		var ws = wb.Sheets[wb.SheetNames[0]];
		var data = XLSX.utils.sheet_to_json(ws, {header:1});
		/* update canvas-datagrid */
		if(!cDg) cDg = canvasDatagrid({ parentNode:HTMLOUT, data:data });
		cDg.style.height = '100%';
		cDg.style.width = '100%';
		cDg.data = data;
		XPORT.disabled = false;
		/* create schema (for A,B,C column headings) */
		var range = XLSX.utils.decode_range(ws['!ref']);
		for(var i = range.s.c; i <= range.e.c; ++i) cDg.schema[i - range.s.c].title = XLSX.utils.encode_col(i);
		HTMLOUT.style.height = (window.innerHeight - 400) + "px";
		HTMLOUT.style.width = (window.innerWidth - 50) + "px";
		if(typeof console !== 'undefined') console.log("output", new Date());
})();
var do_file = (function() {
	return function do_file(files) {
		var f = files[0];
		var reader = new FileReader();
		reader.onload = function(e) {
			if(typeof console !== 'undefined') console.log("onload", new Date());
			var data = e.target.result;
			data = new Uint8Array(data);
			process_wb(XLSX.read(data, {type: 'array'}));
		reader.readAsArrayBuffer(f);
})();
(function() {
	var drop = document.getElementById('drop');
	if(!drop.addEventListener) return;
	function handleDrop(e) {
		e.stopPropagation();
		e.preventDefault();
		do_file(e.dataTransfer.files);
	function handleDragover(e) {
		e.stopPropagation();
		e.preventDefault();
		e.dataTransfer.dropEffect = 'copy';
	drop.addEventListener('dragenter', handleDragover, false);
	drop.addEventListener('dragover', handleDragover, false);
	drop.addEventListener('drop', handleDrop, false);
})();
(function() {
	var xlf = document.getElementById('xlf');
	if(!xlf.addEventListener) return;
	function handleFile(e) { do_file(e.target.files); }
	xlf.addEventListener('change', handleFile, false);
})();
var export_xlsx = (function() {
	function prep(arr) {
		var out = [];
		for(var i = 0; i < arr.length; ++i) {
			if(!arr[i]) continue;
			if(Array.isArray(arr[i])) { out[i] = arr[i]; continue };
			var o = new Array();
			Object.keys(arr[i]).forEach(function(k) { o[+k] = arr[i][k] });
			out[i] = o;
		return out;
	return function export_xlsx() {
		if(!cDg) return;
		/* convert canvas-datagrid data to worksheet */
		var new_ws = XLSX.utils.aoa_to_sheet(prep(cDg.data));
		/* build workbook */
		var new_wb = XLSX.utils.book_new();
		XLSX.utils.book_append_sheet(new_wb, new_ws, 'SheetJS');
		/* write file and trigger a download */
		XLSX.writeFile(new_wb, 'sheetjs.xlsx', {bookSST:true});
})();
</script>
<script type="text/javascript">
/* eslint no-use-before-define:0 */
	var _gaq = _gaq || [];
	_gaq.push(['_setAccount', 'UA-36810333-1']);
	_gaq.push(['_trackPageview']);
	(function() {
		var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
		ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
		var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
	})();
</script>
</body>
</html>
                    &lt;!DOCTYPE html&gt;&lt;!-- xlsx.js (C) 2013-present  SheetJS http://sheetjs.com --&gt;&lt;!-- vim: set ts=2: --&gt;&lt;html&gt;&lt;head&gt;&lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /&gt;&lt;title&gt;SheetJS + canvas-dat.
				
SheetJS js-xlsx git地址:https://github.com/SheetJS/sheetjs#sheetjs-js-xlsx 可以查看更详细的官方文档 如何导入读取Excel文件 先在页面中写一个导入文件的地方,以功能为目的,先不要在意样式 再写个文件处理完点击输出的小button 然后再引入xlsx,想用jquery再引一个这个库 <input type="file" id="file1"><br> <button style="margin-left:
&lt;mx:Canvas width="25%" height="100%" borderStyle="solid" borderColor="black" shadowDistance="0" cornerRadius="8" dropShadowEnabled="true"&gt; &lt;mx:Canvas id="_mask
// 获取canvas元素和绘图上下文 var canvas = document.getElementById("myCanvas"); var ctx = canvas.getContext("2d"); // 创建一个Image对象并加载图片 var img = new Image(); img.src = "path/to/image.jpg"; // 等待图片加载完成后执行切割操作 img.onload = function() { // 设置切割区域的起始坐标和宽高 var startX = 100; var startY = 100; var cropWidth = 200; var cropHeight = 200; // 绘制原始图片 ctx.drawImage(img, 0, 0); // 获取切割后的图片数据 var imageData = ctx.getImageData(startX, startY, cropWidth, cropHeight); // 创建一个新的Canvas用于显示切割后的图片 var cropCanvas = document.createElement("canvas"); cropCanvas.width = cropWidth; cropCanvas.height = cropHeight; var cropCtx = cropCanvas.getContext("2d"); // 将切割后的图片数据绘制到新的Canvas上 cropCtx.putImageData(imageData, 0, 0); // 将切割后的图片显示在页面上 document.body.appendChild(cropCanvas); 在上述代码中,首先获取了Canvas元素和绘图上下文,然后创建一个Image对象并指定要加载的图片路径。在图片加载完成后,使用`drawImage()`方法将原始图片绘制到Canvas上。接下来,使用`getImageData()`方法获取指定区域的图片数据。然后,创建一个新的Canvas元素并设置其宽度和高度为切割区域的宽度和高度,并获取其绘图上下文。最后,使用`putImageData()`方法将切割后的图片数据绘制到新的Canvas上,并将该Canvas添加到页面上以显示切割后的图片。 请注意,上述代码中的`"myCanvas"`应该替换为你实际使用的Canvas元素的id,而`"path/to/image.jpg"`应该替换为你要加载的图片的路径。切割区域的起始坐标和宽高可以根据你的需求进行调整。 Enforcing a policy for regular password changes is no longer recommended, as it can result in more h 使用 PowerSell 脚本从 Windows PE 解锁 BitLocker 驱动器 什么是交换分区以及如何创建一个交换分区 Enforcing a policy for regular password changes is no longer recommended, as it can result in more h 使用 PowerSell 脚本从 Windows PE 解锁 BitLocker 驱动器 什么是交换分区以及如何创建一个交换分区