Question

我正在尝试使用CSS和HTML在线创建一个小型记事本应用程序。出于某种原因，我的应用程序会创建一个奇怪的故障，您可以在文本区域向下滚动得足够远，然后向上滚动以查找缺少的标题。

https://jsfiddle.net/2v7ptadh/
我该如何解决这个问题？

这是创建错误的CSS代码。如果要查看完整代码，请单击上面的JS Fiddle链接。

html,
body {
    display: block;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    background-color: #888;
    height: 100%;
    width: 100%;
    overflow-y: hidden;
}

div#header {
    display: block;
    width: 100%;
    height: 40px;
    border-left: 2px solid rgb(100, 125, 130);
    border-top: 2px solid rgb(150, 175, 140);
    border-bottom: 2px solid rgb(60, 48, 75);
    border-right: 2px solid rgb(80, 84, 90);
    background: #bbb;
    box-sizing: border-box;
    line-height: 40px;
    text-align: center;
    margin: 0;
    padding: 0;
    font-family: 'Open Sans', sans-serif;
    font-weight: 900;
    z-index: 4
}

div#app {
    z-index: 2;
    display: block;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
textarea#app-input {
    display: block;
    box-sizing: border-box;
    padding: 4px;
    margin: 0;
    border: none;
    outline: none;
    width: 100%;
    height: 100%;
    line-height: 23px;
    font-size: 20px;
    resize: none;
}

textarea::selection {
    background: #000;
    color: #fff;
}

问题视频：http://recordit.co/2AxYmb9XxV

Answer 1

如果您要将html/body设置为height: 100%; overflow-y: hidden;，则#app不应为height: 100% - 将其更改为height: calc(100% - 40px) 40px是标题高度。这会将所有内容保留在视口中。

@import url('https://fonts.googleapis.com/css?family=Open+Sans');
html,
body {
  display: block;
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  background-color: #888;
  height: 100%;
  width: 100%;
  overflow-y: hidden;
}

div#header {
  display: block;
  width: 100%;
  height: 40px;
  border-left: 2px solid rgb(100, 125, 130);
  border-top: 2px solid rgb(150, 175, 140);
  border-bottom: 2px solid rgb(60, 48, 75);
  border-right: 2px solid rgb(80, 84, 90);
  background: #bbb;
  box-sizing: border-box;
  line-height: 40px;
  text-align: center;
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
  font-weight: 900;
  z-index: 4
}

div#app {
  z-index: 2;
  display: block;
  width: 100%;
  height: calc(100% - 40px);
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

textarea#app-input {
  display: block;
  box-sizing: border-box;
  padding: 4px;
  margin: 0;
  border: none;
  outline: none;
  width: 100%;
  height: 100%;
  line-height: 23px;
  font-size: 20px;
  resize: none;
}

textarea::selection {
  background: #000;
  color: #fff;
}

<div id="header">ONLINE NOTEPAD</div>
<div id="app">
  <textarea id="app-input"></textarea>
</div>

Answer 2

尝试删除overflow-y：隐藏自html和body

html,
body {
    display: block;
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    background-color: #888;
    height: 100%;
    width: 100%;
}

使用Textarea滚动时标题会消失

2 个答案: