用JS实现excel预览
这次为大家分享的是,如何用js写出excel文件的预览。
他方便了pc用户和手机端用户可以无需下载,并且直接在线预览excel文件。
因为excel转html的显示用的是第三方开源库的代码,所以实现上有所限制。具体请参见 所用到开源的库 这些库的说明。
支持 | 不支持 |
---|---|
多sheet显示 | 图片显示 |
合并后的单元格显示 | 链接,文字样式等 |
手机画面优化 |
效果图
PC:
手机:
示例代码
所用到开源的库
js:
jQuery:https://js.cybozu.cn/jquery/3.4.1/jquery.min.js
sheetjs ( js-xlsx ):https://github.com/SheetJS/sheetjs
bootstrap: https://github.com/twbs/bootstrap
css:
https://github.com/FortAwesome/Font-Awesome
https://github.com/keaukraine/bootstrap4-fs-modal (mobile端)
代码
判断是否为excel文件
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function checkXls(file) { let reg = /\.xl(s[xmb]|t[xm]|am|s)$/g; return reg.test(file); } |
加载模态框,显示加载画面,添加预览图标
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function loadModal(fileInfo) { let previewElement; jQuery( ".file-image-container-gaia" ).each( function (i, e) { let fileName = jQuery(e).children( "a:eq(0)" ).text(); if (fileName == fileInfo.name && jQuery(e).children( "button" ).length == 0) { previewElement = jQuery(e); return false ; } }); if (!previewElement) return ; let modalId = 'myModal' + fileInfo.fileKey; let tabId = 'myTab' + fileInfo.fileKey; let tabContentId = 'tab-content' + fileInfo.fileKey; let $button = $( '<button type="button" class="btn btn-default" data-toggle="modal" data-target="#' + modalId + '"><span class="fa fa-search"></span></button>' ); let myModal = '<style type="text/css">td{word-break: keep-all;white-space:nowrap;}</style>' + '<div class="modal fade tab-pane active" id="' + modalId + '" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">' + '<div class="modal-dialog modal-xl" style="border-radius:5px" role="document">' + '<div class="modal-content">' + '<div class="modal-header">' + '<h5 class="modal-title">' + fileInfo.name + '</h5>' + '<button type="button" class="close" data-dismiss="modal" aria-label="Close">' + '<span aria-hidden="true">×</span>' + '</button>' + '</div>' + '<ul class="nav nav-tabs" id=' + tabId + '>' + '</ul>' + '<div id=' + tabContentId + ' class="tab-content">' + '<div class="d-flex justify-content-center">' + '<div class="spinner-border" role="status">' + '<span class="sr-only">Loading...</span>' + '</div>' + '</div>' + '</div>' + '<div class="modal-footer">' + '<button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>' + '</div>' + '</div>' + '</div>' + '</div>' ; previewElement.append($button); $( 'body' ).prepend(myModal); $( '#' + modalId).on( 'shown.bs.modal' , function (e) { loadRemoteFile(fileInfo); }) } |
下载文件并加载到模态框中
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function readWorkbookFromRemoteFile(url, callback) { let xhr = new XMLHttpRequest(); xhr.open( 'get' , url, true ); xhr.setRequestHeader( 'X-Requested-With' , 'XMLHttpRequest' ); xhr.responseType = 'arraybuffer' ; xhr.onload = function (e) { if (xhr.status == 200) { let data = new Uint8Array(xhr.response) let workbook = XLSX.read(data, { type: 'array' }); if (callback) callback(workbook); } }; xhr.send(); } function readWorkbook(workbook, fileInfo) { let sheetNames = workbook.SheetNames; let navHtml = '' ; let tabHtml = '' ; let myTabId = 'myTab' + fileInfo.fileKey; let tabContentId = 'tab-content' + fileInfo.fileKey; for (let index = 0; index < sheetNames.length; index++) { let sheetName = sheetNames[index]; let worksheet = workbook.Sheets[sheetName]; let sheetHtml = XLSX.utils.sheet_to_html(worksheet); let tabid = "tab" + fileInfo.fileKey + "-" + index; let xlsid = "xlsid" + fileInfo.fileKey + "-" + index; let active = index == 0 ? "active" : '' ; navHtml += '<li class="nav-item"><a class="nav-link ' + active + '" href="#" data-target="#' + tabid + '" data-toggle="tab">' + sheetName + '</a></li>' ; tabHtml += '<div id="' + tabid + '" class="tab-pane ' + active + '" style="padding:10px;overflow:auto;height:600px" >' + '<div id="' + xlsid + '">' + sheetHtml + ' </div></div>' ; } jQuery( "#" + myTabId).html(navHtml); jQuery( "#" + tabContentId).html(tabHtml); jQuery( "#" + tabContentId + ' table' ).addClass( "table table-bordered table-hover" ); } function loadRemoteFile(fileInfo) { let fileUrl = '/k/v1/file.json?fileKey=' + fileInfo.fileKey; readWorkbookFromRemoteFile(fileUrl, function (workbook) { readWorkbook(workbook, fileInfo); }); } |
具体的mobile优化等等详细代码请参考完整文章:
更多文章和演示:Kintone demo环境