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       
(Showing Draft Content)

增加Loading页面

需求:加载大文件时,希望在加载器件能够有一个Loading的遮罩层,让用户知道是在加载从而提高用户体验


背景:

相信有很多小伙伴在实际应用中,存在许多需要加载的大文件。在加载大文件的时候,由于浏览器的限制,可能需要花费一些时间,在这个时候需要加Loading这样的遮罩层。能够使得用户知道表单是在加载中,而不是“卡死”的情况,能够有效提升用户体验。当然,我们在v14也推出了增量加载,当导入大文件时建议使用增量加载以帮助优化初始加载时间。

具体效果如下,我们来看下如何实现吧。

image

解决方案:

首先我们需要提前准备一张loding的gif图,在加载的时候用。并且创建两个DOM,一个是加载的gif图,一个是不允许用户操作表单的遮罩层。

<div class='center' id="load"></div>

<div id="ZZ"></div>

对应的样式如下,loding图我们就让他页面居中显示,遮罩层设置一些透明度使其覆盖整个页面。并且两者默认都是不显示。

.center {
  width: 100px;
  height: 100px;
  text-align: center;
  color: #fff;
  display: none;
  text-align: center;
}
#ZZ {
  display: none;
  position: absolute;
  top: 0%;
  left: 0%;
  width: 100%;
  height: 100%;
  background-color: black;
  z-index: 99999;
  -moz-opacity: 0.1;
  opacity: 0.1;
  filter: alpha(opacity=10);
}

最后就是通过修改css的display属性使其显示或者隐藏。这里之所以用settimeout是因为刷新UI线程不应被js代码执行中断,添加setTimeout以提供浏览器刷新UI的机会。

document.getElementById("ZZ").style.display = "block";
show(CenterDiv);

setTimeout(function () {
  spread.fromJSON(data);

  hide(CenterDiv);
  document.getElementById("ZZ").style.display = "none";
}, 0);

下载完整版Demo请查看论坛精华贴:https://gcdn.grapecity.com.cn/forum.php?mod=viewthread&tid=98339&fromuid=59119

作者: Grapecity.China | 审核:Clark.Pan | 更新时间:2023.12.24