Web Front-endJS Tutorialjs implements file upload form field beautification effects_javascript skillsjs implements file upload form field beautification effects_javascript skills
一款效果非常时尚的文件上传表单域美化特效，下面给出制作的简要教程。
先上几个效果饱饱眼福：
使用方法
这些文件上传域的美化使用的方法都是隐藏原生的元素，然后使用一个
该文件上传域美化效果最基本的HTML结构如下：
<input type="file" name="file" id="file" class="inputfile" /> <label for="file">Choose a file</label>
CSS样式
首先需要隐藏元素。这里不能使用display: none或visibility: hidden来隐藏它，因为这样做只后，元素里的值不会被上传到服务器端，而且按TAB键时这个元素也不会被找到。隐藏的方法如下：
.inputfile {
width: 0.1px;
height: 0.1px;
opacity: 0;
overflow: hidden;
position: absolute;
z-index: -1;
}
接下来给
.inputfile + label {
font-size: 1.25em;
font-weight: 700;
color: white;
background-color: black;
display: inline-block;
}
.inputfile:focus + label,
.inputfile + label:hover {
background-color: red;
}
当鼠标滑过label时需要将光标显示为一个小手的形状。
.inputfile + label {
cursor: pointer; /* "hand" cursor */
}
为了制作可以使用键盘导航的效果，需要添加下面的代码。
.inputfile:focus + label {
outline: 1px dotted #000;
outline: -webkit-focus-ring-color auto 5px;
}
-webkit-focus-ring-color auto 5px可以在 Chrome，Opera 和 Safari浏览器中获取默认的边框外观。
如果你使用了类似FastClick（一个在移动触摸设备上消除300毫秒tap-pause的工具库），并且你需要添加一些文本标签，那么按钮将不会正常工作，除非设置了pointer-events: none。
<label for="file"><strong>Choose a file</strong></label>
.inputfile + label * {
pointer-events: none;
}
JavaScript
最后需要做的事情是标识用户选择了哪些文件。原生的文件上传域是有这个功能的，但是这里使用的是虚拟的按钮。特效中使用javascript来实现这个功能。
<input type="file" name="file" id="file" class="inputfile" data-multiple-caption="{count} files selected" multiple />
var inputs = document.querySelectorAll( '.inputfile' );
Array.prototype.forEach.call( inputs, function( input )
{
var label = input.nextElementSibling,
labelVal = label.innerHTML;
input.addEventListener( 'change', function( e )
{
var fileName = '';
if( this.files && this.files.length > 1 )
fileName = ( this.getAttribute( 'data-multiple-caption' ) || '' ).replace( '{count}', this.files.length );
else
fileName = e.target.value.split( '\\' ).pop();
if( fileName )
label.querySelector( 'span' ).innerHTML = fileName;
else
label.innerHTML = labelVal;
});
});
浏览器禁用JavaScript的处理
如果浏览器禁用了JavaScript，那么只有使用原生的文件上传域组件。我们需要做的事情是在元素上添加一个.no-js的class，然后使用Javascript来替换它。
<html class="no-js">
<head>
<!-- remove this if you use Modernizr -->
<script>(function(e,t,n){var r=e.querySelectorAll("html")[0];r.className=r.className.replace(/(^|\s)no-js(\s|$)/,"$1js$2")})(document,window,0);</script>
</head>
</html>
.
js .inputfile {
width: 0.1px;
height: 0.1px;
opacity: 0;
overflow: hidden;
position: absolute;
z-index: -1;
}
.no-js .inputfile + label {
display: none;
}
以上就是js实现文件上传表单域美化特效，希望对大家的学习有所帮助。
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