使用JavaScript實現彈出層效果的簡單例項
阿新 • • 發佈:2018-12-19
轉自:https://www.jb51.net/article/85475.htm
實現彈出層效果的思路非常簡單:將待顯示的內容先隱藏,在觸發某種條件後(如點選按鈕),將原本隱藏的內容顯示出來。
實現
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<!DOCTYPE html>
<html>
<head>
<title>Window物件</title>
<meta charset=
"utf-8" >
</head>
<body>
<a href=
"http://www.baidu.com"
>百度一下</a>
<button type=
"button"
id=
"open"
>開啟彈出層</button> <div style=
"display: none;background: lightblue;border:1px solid green;"
id=
"toast"
> <!-- 設定display屬性為none以隱藏內容 -->
<p>這裡是彈出層內容</p>
<button type=
"button"
id=
"close"
>關閉彈出層</button>
</div>
<script type=
"text/javascript"
>
var
toast = document.getElementById(
"toast"
);
document.getElementById(
"open"
).onclick =
function
(e){ <!-- 定義點選事件顯示隱藏內容 -->
toast.style.display =
"block"
;
toast.style.position =
"fixed"
;
var
winWidth = window.innerWidth;
var
winHeight = window.innerHeight;
var
targetWidth = toast.offsetWidth;
var
targetHeight = toast.offsetHeight;
toast.style.top = (winHeight - targetHeight) / 2 +
"px"
;
toast.style.left = (winWidth - targetWidth) / 2 +
"px"
;
}
document.getElementById(
"close"
).onclick =
function
(e){ <!-- 將顯示的內容再次隱藏 -->
toast.style.display =
"none"
;
}
</script>
</body>
</html>
|
顯示效果如下:
但是我們可以注意到,在彈出隱藏內容之後我們還是可以通過連結進入百度頁面。為了防止這種情況的發生,我們可以提供遮罩層將原先的頁面內容全部遮住。程式碼如下:
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<!DOCTYPE html>
<html>
<head>
<title>Window物件</title>
<meta charset=
"utf-8"
>
</head>
<body>
<a href=
"http://www.baidu.com"
>百度一下</a>
<button type=
"button"
id=
"open"
>開啟彈出層</button>
<div id=
"cover"
style=
"display: none;position: fixed;width: 100%;height: 100%;top:0px;left:0px;background: gray;"
> <!-- 通過遮罩層遮住背景 -->
<div style=
"background: lightblue;border:1px solid green;"
id=
"toast"
> <!-- 設定display屬性為none以隱藏內容 -->
<p>這裡是彈出層內容</p>
<button type=
"button"
id=
"close"
>關閉彈出層</button>
</div>
</div>
<script type=
"text/javascript"
>
var
toast = document.getElementById(
"toast"
);
var
cover = document.getElementById(
"cover"
);
document.getElementById(
"open"
).onclick =
function
(e){ <!-- 定義點選事件顯示隱藏內容 -->
cover.style.display =
"block"
;
toast.style.position =
"fixed"
;
var
winWidth = window.innerWidth;
var
winHeight = window.innerHeight;
var
targetWidth = toast.offsetWidth;
var
targetHeight = toast.offsetHeight;
toast.style.top = (winHeight - targetHeight) / 2 +
"px"
;
toast.style.left = (winWidth - targetWidth) / 2 +
"px"
;
}
document.getElementById(
"close"
).onclick =
function
(e){ <!-- 將顯示的內容再次隱藏 -->
cover.style.display =
"none"
;
}
</script>
</body>
</html>
|
這是再次測試下效果,如下圖:
總結
上述內容只是簡單實現了彈出層效果,但是通過新增更多的程式碼也可以在此基礎上實現更復雜的功能。