样式化input type="file"按钮

你如何风格输入类型=“文件”按钮?

<输入类型=“文件” />

当前回答

不要被“伟大的”css解决方案所欺骗，这些解决方案实际上非常特定于浏览器，或者将样式化按钮覆盖在真正的按钮之上，或者强迫您使用<label>而不是<button>，或任何其他类似的hack。JavaScript是必要的，以使其工作为一般用途。如果你不相信我，请学习gmail和DropZone是怎么做的。

只要按你想要的样式设计一个普通的按钮，然后调用一个简单的JS函数来创建并链接一个隐藏的输入元素到你的样式按钮。

<!DOCTYPE html>
<meta charset="utf-8">

<style>
    button {
        width            : 160px;
        height           : 30px;
        font-size        : 13px;
        border           : none;
        text-align       : center;
        background-color : #444;
        color            : #6f0;
    }
    button:active {
        background-color : #779;
    }
</style>

<button id="upload">Styled upload button!</button>

<script>

function Upload_On_Click(id, handler) {
    var hidden_input = null;
    document.getElementById(id).onclick = function() {hidden_input.click();}
    function setup_hidden_input() {
        hidden_input && hidden_input.parentNode.removeChild(hidden_input);
        hidden_input = document.createElement("input");
        hidden_input.setAttribute("type", "file");
        hidden_input.style.visibility = "hidden";
        document.querySelector("body").appendChild(hidden_input);
        hidden_input.onchange = function() {
            handler(hidden_input.files[0]);
            setup_hidden_input();
        };
    }
    setup_hidden_input();
}

Upload_On_Click("upload", function(file) {
    console.log("GOT FILE: " + file.name);
});

</script>

注意上面的代码是如何在用户每次选择一个文件后重新链接它的。这很重要，因为只有当用户更改文件名时才会调用"onchange"。但您可能希望在用户每次提供该文件时获取该文件。

2017-09-09 06:34:38

其他回答

这是一个纯CSS，无javascript，无bootstrap, 100%跨浏览器的解决方案!只需剪切粘贴一个样式块，然后测试您的文件上传控制。

这个解决方案不像其他文章那样试图隐藏然后重新创建原始HTML元素。它使用纯CSS，没有任何马戏团技巧或第三方工具，为所有主要浏览器设置原始文件上传表单控件的样式。你甚至不需要改变你的HTML代码!只需剪切并粘贴下面的代码到你的网页来测试它…

<style>
/* Note: This CSS will style all instances of 
   <input type=file /> controls in your website. */
input[type="file"],
input[type="file"]:visited,
input[type="file"]:hover,
input[type="file"]:focus,
input[type="file"]:active {
    margin:0;
    padding: 0em 0em;/* fallback: older browsers like IE 1-8 need "em" */
    padding: 0rem 0rem;/* older browsers dont know what "rem" is */
    overflow: hidden; /* long file names overflow so just hide the end */
    background: #fff;
    border-radius: .2em;
    border-radius: .2rem;
    outline: none;
    border: 2px solid #bbb;
    cursor: pointer;
    -webkit-appearance: textfield;
    -moz-appearance: textfield;
}

input[type="file"]:hover {
    background: #f9f9ff; /* Optional rollover color: I am using a light blue to indicate an interaction */
    border: 2px solid #999;
}

input[type="file"]:visited,
input[type="file"]:focus,
input[type="file"]:active {
    background: #fff; /* Default back to white when focused. */
    border: 2px solid #999;
}

/* Note: These "disabled" selectors blow up in IE so have to be separated from the same styles above. */
input[type="file"]:disabled {
    margin: 0;
    padding: 0em 0em;
    padding: 0rem 0rem;
    overflow: hidden; /* long file names overflow so just hide the end */
    background: #ddd;
    border-radius: .2em;
    border-radius: .2rem;
    outline: none;
    border: 2px solid #bbb;
    cursor: pointer;
    -webkit-appearance: textfield;
    -moz-appearance: textfield;
}

input[type="file"]:disabled:hover {
    background: #ddd; /* disabled-readonly buttons should be grey */
    border: 2px solid #999;
}

input[type="file"]:disabled:visited,
input[type="file"]:disabled:focus,
input[type="file"]:disabled:active {
    background: #ddd; /* disabled-readonly buttons should be grey */
    border: 2px solid #999;
}

/* IE UPLOAD BUTTON STYLE: This attempts to alter the file upload button style in IE.  Keep in mind IE gives you limited design control but at least you can customize its upload button.*/
::-ms-browse { /* IE */
    display: inline-block;
    margin: 0;
    padding: .2em .5em;
    padding: .2rem .5rem;
    text-align: center;
    outline: none;
    border: none;
    background: #fff;
    white-space: nowrap;
    cursor: pointer;
}
/* FIREFOX UPLOAD BUTTON STYLE */
::file-selector-button {/* firefox */
    display: inline-block;
    margin: 0rem 1rem 0rem 0rem;
    padding: .18em .5em;
    padding: .18rem .5rem;
    -webkit-appearance: button;
    text-align: center;
    border-radius: .1rem 0rem 0rem .1rem;
    outline: none;
    border: none;
    border-right: 2px solid #bbb;
    background: #eee;
    white-space: nowrap;
    cursor: pointer;
}
/* CHROME AND EDGE UPLOAD BUTTON STYLE */
::-webkit-file-upload-button { /* chrome and edge */
    display: inline-block;
    margin: 0rem 1rem 0rem 0rem;
    padding: .19em .5em;
    padding: .19rem .5rem;
    -webkit-appearance: button;
    text-align: center;
    border-radius: .1rem 0rem 0rem .1rem;
    outline: none;
    border: none;
    border-right: 2px solid #bbb;
    background: #eee;
    white-space: nowrap;
    cursor: pointer;
}
</style>

<input type="file" id="fileupload" name="fileupload" 
value="" tabindex="0" enctype="multipart/form-data" 
accept="image/*" autocomplete="off" multiple="multiple" 
aria-multiselectable="true" title="Multiple File Upload" 
aria-label="Multiple File Upload" />

<br /><br />

<input disabled="disabled" type="file" id="fileupload" 
name="fileupload" value="" tabindex="0" 
enctype="multipart/form-data" accept="image/*" 
autocomplete="off" multiple="multiple" 
aria-multiselectable="true" title="Disabled Multiple File Upload" 
aria-label="Disabled Multiple File Upload" />

这是文件上传控件在Firefox、Chrome和Edge中使用下面的CSS的样子。这是一个非常简单干净的设计。你可以把它变成你喜欢的样子:

Internet Explorer为您提供了有限的设计控制，但至少您可以使用CSS操作控件来更改一些东西，包括圆形边框和颜色:

我的解决方案的优点是:

You stick with simple CSS to style the original HTML input control You can see one or more file names in the file input textbox Screen readers and ARIA-friendly devices can interact normally with your file upload control You can set tabindex on your HTML element so its part of the tab order Because you are using plain HTML and CSS, your file input button works perfectly in old and new browsers ZERO JavaScript required! Runs and loads lighting fast in even the oldest of browsers Because your are not using "display:none" to hide the control, its file block stream data is never disabled from reaching the server in any old or new browser version known

你不需要愚蠢的JavaScript技巧，Bootstrap，或尝试隐藏/重新创建你的文件输入控件。这只会破坏所有在线用户的可用性。样式化原始HTML控件意味着你的文件上传控件在25年的新老浏览器中都能很好地工作。

This is why you cannot trust all these scripted hacks here that erase, rewrite, or destroy HTML just to try and recreate some visual experience. That shows that you do not understand how HTML is used or why its been around for 30 years practically unchanged. You should never try and rewrite HTML's native form control functionality. Why? There is more to using natural HTML in websites than just manipulation of markup for some forced visual experience. The trade-offs of limited visual design in these replaced HTML elements was designed that way for a reason.

我的建议是:坚持使用简单的HTML和CSS解决方案，作为web开发人员，你将没有任何问题。

2021-01-23 23:55:48

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

2009-02-21 10:41:05

如果有人仍然关心如何在没有JavaScript的情况下做到这一点，让我完成Josh的回答:

如何显示文件名的文本:

最简单的方法是将这两个元素设置到一个位置:相对，给标签一个更高的z-index，并给输入文件负边距，直到标签文本在你想要的位置。不要在输入时使用display:none !

例子:

input[type="file"] {
  position:relative;
  z-index:1;
  margin-left:-90px;
}

.custom-file-upload {
  border: 1px solid #ccc;
  display: inline-block;
  padding: 6px 12px;
  cursor: pointer;
  position:relative;
  z-index:2;
  background:white;

}

2015-10-05 16:20:38

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: