多重上传解决方案

我调整了之前的两个答案，包括多次上传。这样，如果只选中一个文件，则标签显示文件名，反之则显示x个文件。

<label class="btn btn-primary" for="my-file-selector">
    <input id="my-file-selector" type="file" multiple="multiple" style="display:none"
        onchange="$('#upload-file-info').html(
            (this.files.length > 1) ? this.files.length + ' files' : this.files[0].name)">                     
    Files&hellip;
</label>
<span class='label label-info' id="upload-file-info"></span>

它也可以应用于更改按钮文本和类。

<label class="btn btn-primary" for="multfile">
    <input id="multfile" type="file" multiple="multiple" style="display:none"
        onchange="$('#multfile-label').html(
            (this.files.length == 1) ? this.files[0].name : this.files.length + ' files');
            $(this).parent().addClass('btn-success')">
    <span id="multfile-label">Files&hellip;</span>
</label>

设置上传按钮的样式很麻烦，因为它设置的是输入的样式而不是按钮的样式。

但是你可以用这个技巧:

http://www.quirksmode.org/dom/inputfile.html

简介:

Take a normal <input type="file"> and put it in an element with position: relative. To this same parent element, add a normal <input> and an image, which have the correct styles. Position these elements absolutely, so that they occupy the same place as the <input type="file">. Set the z-index of the <input type="file"> to 2 so that it lies on top of the styled input/image. Finally, set the opacity of the <input type="file"> to 0. The <input type="file"> now becomes effectively invisible, and the styles input/image shines through, but you can still click on the "Browse" button. If the button is positioned on top of the image, the user appears to click on the image and gets the normal file selection window. (Note that you can't use visibility: hidden, because a truly invisible element is unclickable, too, and we need the to remain clickable)

这是珍妮的自举叉里的。

可以使用。创建简单的上传按钮

<span class="btn btn-file">Upload<input type="file" /></span>

使用fileupload插件，您可以创建更高级的小部件。看一看 http://jasny.github.io/bootstrap/javascript/#fileinput

关于claviska的答案-如果你想在一个基本的文件上传中显示上传的文件名，你可以在输入的onchange事件中这样做。只需使用以下代码:

 <label class="btn btn-default">
                    Browse...
                    <span id="uploaded-file-name" style="font-style: italic"></span>
                    <input id="file-upload" type="file" name="file"
                           onchange="$('#uploaded-file-name').text($('#file-upload')[0].value);" hidden>
 </label>

这个jquery JS代码负责检索上传的文件名:

$('#file-upload')[0].value

或者用香草JS:

document.getElementById("file-upload").value

这是另一个技巧，它不是最好的解决方案，但它只是给你一个选择

HTML代码:

<button clss="btn btn-primary" id="btn_upload">Choose File</button>
<input id="fileupload" class="hide" type="file" name="files[]">

Javascript:

$("#btn_upload").click(function(e){
e.preventDefault();
$("#fileupload").trigger('click');
});

对我有用:

Bootstrap中漂亮的文件输入字段

更新

jQuery插件风格:

// Based in: http://duckranger.com/2012/06/pretty-file-input-field-in-bootstrap/
// Version: 0.0.3
// Compatibility with: Bootstrap 3.2.0 and jQuery 2.1.1
// Use:
//     <input class="nice_file_field" type="file" data-label="Choose Document">
//     <script> $(".nice_file_field").niceFileField(); </script>
//
(function( $ ) {
  $.fn.niceFileField = function() {
    this.each(function(index, file_field) {
      file_field = $(file_field);
      var label = file_field.attr("data-label") || "Choose File";

      file_field.css({"display": "none"});

      nice_file_block_text  = '<div class="input-group nice_file_block">';
      nice_file_block_text += '  <input type="text" class="form-control">';
      nice_file_block_text += '  <span class="input-group-btn">';
      nice_file_block_text += '   <button class="btn btn-default nice_file_field_button" type="button">' + label + '</button>';
      nice_file_block_text += '  </span>';
      nice_file_block_text += '</div>';

      file_field.after(nice_file_block_text);

      var nice_file_field_button = file_field.parent().find(".nice_file_field_button");
      var nice_file_block_element = file_field.parent().find(".nice_file_block");

      nice_file_field_button.on("click", function(){ console.log("click"); file_field.click() } );
      file_field.change( function(){
        nice_file_block_element.find("input").val(file_field.val());
      });
    });
  };
})( jQuery );