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);
}
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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);
})
}
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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);
});
}
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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