如何访问文件上传按钮的属性？ [英] How to access the properties of a file upload button?

问题描述

您可以告诉我如何将css属性分配给type = file的按钮，例如：

can you show me how to assign css properties to the button that is of type=file,say:

<input type="file"  name="coolFile">

我知道在css中你需要这样做：

I know that in css you need to do this:

  input[type=file]{
     background:#ccf;
//and so on
}

按钮？

推荐答案

不幸的是，主流浏览器不允许设计师直接对文件输入字段进行样式化。您可以将此视为安全功能，因为如果文件输入字段以棘手的方式设置，用户可能会被诱骗上传文件。

Unfortunately, mainstream browsers do not allow designers to directly style file input fields. You can consider this a "security feature" because users could potentially be tricked into uploading files if the file input field is styled in a tricky way.

有一个解决方案涉及创建第二输入字段，并隐藏其后面的实际文件输入。以下内容已从 http://www.quirksmode.org/dom/inputfile.html：

There is a solution that involves creating a second input field, and hiding the actual file input behind it. The following was lifted from http://www.quirksmode.org/dom/inputfile.html:

div.fileinputs {
    position: relative;
}

div.fakefile {
    position: absolute;
    top: 0px;
    left: 0px;
    z-index: 1;
}

input.file {
    position: relative;
    text-align: right;
    -moz-opacity:0 ;
    filter:alpha(opacity: 0);
    opacity: 0;
    z-index: 2;
}

<div class="fileinputs">
    <input type="file" class="file" />
    <div class="fakefile">
        <input />
        <img src="search.gif" />
    </div>
</div>

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