你如何风格输入类型=“文件”按钮?

<输入类型=“文件” />


当前回答

最好的方法是使用伪元素:after或:before作为显化de input的元素。然后按照您的意愿设置该伪元素的样式。我建议你为所有输入文件做一个通用的样式,如下所示:

input {
  height: 0px;
  outline: none;
}

input[type="file"]:before {
  content: "Browse";
  background: #fff;
  width: 100%;
  height: 35px;
  display: block;
  text-align: left;
  position: relative;
  margin: 0;
  margin: 0 5px;
  left: -6px;
  border: 1px solid #e0e0e0;
  top: -1px;
  line-height: 35px;
  color: #b6b6b6;
  padding-left: 5px;
  display: block;
}

其他回答

我能想到的唯一方法是在它被渲染后用javascript找到按钮,并分配一个样式给它

你也可以看看这个记录

我发现这种方法最简单、最轻便。

下面是工作示例:http://codepen.io/c3zar22/pen/QNoYXN

以下是解释:

this would be the markup: <label for="attach-project-file"> <span id="remove-project-file" class="close">x</span> <div class="filename" id="attached-project-file">Click to select a file</div> </label> <input id="attach-project-file" type="file"> hide the input in a hacky way like this: #attach-project-file { width: 0.1px; height: 0.1px; opacity: 0; overflow: hidden; position: absolute; z-index: -1; } style the corresponding label instead [for="attach-project-file"] { /* your styles here */ } style "remove file" button .close { font-size: 16px; padding: 10px; position: absolute; top: 0; right: 0; cursor: pointer; font-style: normal; } .filename element will be used to display the selected file below is the commented JS code needed (using jQuery) to make it work: var $attach = $('#attach-project-file'), $remove = $('#remove-project-file'), $name = $('#attached-project-file'); // initially hide the remove button $remove.hide(); // do this when file input has changed // i.e.: a file has been selected $attach.on('change', function() { var val = $(this).val(); if (val !== '') { // if value different than empty // show the file name as text // hide/text/fadeIn creates a nice effect when changing the text $name .hide() .text(val) .fadeIn(); // show the remove button $remove.fadeIn(); } else { // if value empty, means the file has been removed // show the default text $name .hide() .text('Click to select a file') .fadeIn(); // hide remove button $remove.fadeOut(); } }); // remove selected file when clicking the remove button // prevent click bubbling to the parent label and triggering file selection $remove.on('click', function(e) { e.preventDefault(); e.stopPropagation(); $attach .val('') .change(); // trigger change event });

样式化文件输入是出了名的困难,因为大多数浏览器不会改变CSS或javascript的外观。

即使输入的大小也不会对以下内容做出反应:

<input type="file" style="width:200px">

相反,你需要使用size属性:

<input type="file" size="60" />

对于任何比这更复杂的样式(例如改变浏览按钮的外观),你将需要考虑在本机文件输入上覆盖一个有样式的按钮和输入框的狡猾方法。rm在www.quirksmode.org/dom/inputfile.html上提到的那篇文章是我见过的最好的一篇。

更新

虽然直接对<input>标记设置样式很困难,但在<label>标记的帮助下,这很容易实现。请看下面来自@JoshCrozier的回答:https://stackoverflow.com/a/25825731/10128619

正如JGuo和CorySimmons提到的,您可以使用可样式标签的可点击行为,隐藏不太灵活的文件输入元素。

<!DOCTYPE html>
<html>
<head>
<title>Custom file input</title>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
</head>

<body>

<label for="upload-file" class="btn btn-info"> Choose file... </label>
<input id="upload-file" type="file" style="display: none"
onchange="this.nextElementSibling.textContent = this.previousElementSibling.title = this.files[0].name">
<div></div>

</body>
</html>

用css隐藏它,并使用$(selector).click()自定义按钮来激活浏览按钮。然后设置检查文件输入类型值的时间间隔。interval可以显示用户的值,这样用户就可以看到上传了什么。当表单提交时,间隔将清除[编辑]对不起,我一直很忙,是想更新这篇文章,这里是一个例子

<form action="uploadScript.php" method="post" enctype="multipart/form-data">
<div>
    <!-- filename to display to the user -->
    <p id="file-name" class="margin-10 bold-10"></p>

    <!-- Hide this from the users view with css display:none; -->
    <input class="display-none" id="file-type" type="file" size="4" name="file"/>

    <!-- Style this button with type image or css whatever you wish -->
    <input id="browse-click" type="button" class="button" value="Browse for files"/>

    <!-- submit button -->
    <input type="submit" class="button" value="Change"/>
</div>

$(window).load(function () {
    var intervalFunc = function () {
        $('#file-name').html($('#file-type').val());
    };
    $('#browse-click').on('click', function () { // use .live() for older versions of jQuery
        $('#file-type').click();
        setInterval(intervalFunc, 1);
        return false;
    });
});