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在SpreadJS中显示水印

问题：怎么在SpreadJS中显示水印

背景：

在很多web文档类系统中，需要在用户查看文档时显示水印，避免一些信息泄露。目前SpreadJS支持单元格水印及打印水印，但不支持在整个spread上设置水印

解决方案：

本文通过借助SpreadJS背景图片来实现显示水印。


在实际项目中，水印一般显示的是当前登录系统的用户名称，我们可以考虑使用一张包含用户名称的图片来作为SpreadJS的背景图，从而实现显示水印的效果。但大部分客户不愿意去根据用户提前只做大量的图片，这样会比较麻烦一些。


其实我们可以采取其它一些方式来生成图片，例如通过canvas来动态绘制生成图片，但使用canvas直接绘制写起来略微困难，我们可以选择一些三方库，站在巨人的肩膀上，快速实现图片的生成。本文采用的就是html2canvas。


1、创建html结构

<style>
    #capture {
        background: #eee;
        width: 400px;
        height: 200px;
        display: flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        top: 0;
        left: 0;
        z-index: -5
    }

    .fillText {
        width: 160px;
        height: 160px;
        line-height: 160px;
        transform: rotate(-30deg);
        font-size: 30px;
        color: #fff;
    }
</style>
<div id="capture">
    <p class="fillText">ZhangGuoGuo
    <p>

    <p class="fillText">ZhangGuoGuo
    <p>

</div>
<div id="ss" style="width:100%;height:98vh;border:1px solid darkgray"></div>

id为capture的DOM为后续我们要生成图片的目标DOM，在这里设置了相关的背景及文字旋转，但由于它只是用来生成图片，并不需要在页面上显示，因此我们可以修改其层叠结构达到隐藏DOM的效果。


2、生成图片并设置位spreadjs的背景

let spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"));

let pic;
html2canvas(document.getElementById("capture")).then(function (canvas) {
  pic = canvas.toDataURL();
  spread.options.backgroundImage = pic;
  spread.options.backgroundImageLayout = GC.Spread.Sheets.ImageLayout.none;
  setTimeout(() => {
    document.getElementById("ssvp_vp").style.backgroundRepeat = "repeat";
  }, 10);
});

设置完成之后，最终的显示效果如下：


image

作者: GrapeCity China | 审核：Richard.Ma | 更新时间：2023.11.15