HTML5区域范围文本框实例页面

时间：2022-08-02 19:56:17
CSS代码：
input { font-size: 14px; font-weight: bold;  }

input[type=range]:before { content: attr(min); padding-right: 5px; }

input[type=range]:after { content: attr(max); padding-left: 5px;}

output {

    display: block;

    font-size: 5.5em;

    font-weight: bold;

}
HTML代码：
<form method="post">

    <h4>音量控制</h4>

    <input type="range" name="range" min="0" max="10" step="1" value="" />

    <output name="result">  </output>

</form>
JS代码：
(function() {

    var f = document.forms[0],

        range = f['range'],

        result = f['result'],

        cachedRangeValue = localStorage.rangeValue ? localStorage.rangeValue : 5; 

    // 检测浏览器是否是足够酷

    // 识别range input.

    var o = document.createElement('input');

    o.type = 'range';

    if ( o.type === 'text' ) alert('不好意思，你的浏览器还不够酷，试试最新的Opera浏览器吧。');

    // 设置初始值

    // 无论是否本地存储了，都设置值为5

    range.value = cachedRangeValue;

    result.value = cachedRangeValue;

    // 当用户选择了个值，更新本地存储

    range.addEventListener("mouseup", function() {

        alert("你选择的值是：" + range.value + ". 我现在正在用本地存储保存此值。在现代浏览器上刷新并检测。");

        localStorage ? (localStorage.rangeValue = range.value) : alert("数据保存到了数据库或是其他什么地方。");

    }, false);

    // 滑动时显示选择的值

    range.addEventListener("change", function() {

        result.value = range.value;

    }, false);

})();
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