／* *引导3文件样式 * http://dev.tudosobreweb.com.br/bootstrap-filestyle/ ＊ *版权所有(c) 2013 Markus Vinicius da Silva Lima *更新引导3保罗恩里克福克斯 * 2.0.0版本 *根据MIT许可证授权。 ＊ * /

(function ($) {
"use strict";

var Filestyle = function (element, options) {
    this.options = options;
    this.$elementFilestyle = [];
    this.$element = $(element);
};

Filestyle.prototype = {
    clear: function () {
        this.$element.val('');
        this.$elementFilestyle.find(':text').val('');
    },

    destroy: function () {
        this.$element
            .removeAttr('style')
            .removeData('filestyle')
            .val('');
        this.$elementFilestyle.remove();
    },

    icon: function (value) {
        if (value === true) {
            if (!this.options.icon) {
                this.options.icon = true;
                this.$elementFilestyle.find('label').prepend(this.htmlIcon());
            }
        } else if (value === false) {
            if (this.options.icon) {
                this.options.icon = false;
                this.$elementFilestyle.find('i').remove();
            }
        } else {
            return this.options.icon;
        }
    },

    input: function (value) {
        if (value === true) {
            if (!this.options.input) {
                this.options.input = true;
                this.$elementFilestyle.prepend(this.htmlInput());

                var content = '',
                    files = [];
                if (this.$element[0].files === undefined) {
                    files[0] = {'name': this.$element[0].value};
                } else {
                    files = this.$element[0].files;
                }

                for (var i = 0; i < files.length; i++) {
                    content += files[i].name.split("\\").pop() + ', ';
                }
                if (content !== '') {
                    this.$elementFilestyle.find(':text').val(content.replace(/\, $/g, ''));
                }
            }
        } else if (value === false) {
            if (this.options.input) {
                this.options.input = false;
                this.$elementFilestyle.find(':text').remove();
            }
        } else {
            return this.options.input;
        }
    },

    buttonText: function (value) {
        if (value !== undefined) {
            this.options.buttonText = value;
            this.$elementFilestyle.find('label span').html(this.options.buttonText);
        } else {
            return this.options.buttonText;
        }
    },

    classButton: function (value) {
        if (value !== undefined) {
            this.options.classButton = value;
            this.$elementFilestyle.find('label').attr({'class': this.options.classButton});
            if (this.options.classButton.search(/btn-inverse|btn-primary|btn-danger|btn-warning|btn-success/i) !== -1) {
                this.$elementFilestyle.find('label i').addClass('icon-white');
            } else {
                this.$elementFilestyle.find('label i').removeClass('icon-white');
            }
        } else {
            return this.options.classButton;
        }
    },

    classIcon: function (value) {
        if (value !== undefined) {
            this.options.classIcon = value;
            if (this.options.classButton.search(/btn-inverse|btn-primary|btn-danger|btn-warning|btn-success/i) !== -1) {
                this.$elementFilestyle.find('label').find('i').attr({'class': 'icon-white '+this.options.classIcon});
            } else {
                this.$elementFilestyle.find('label').find('i').attr({'class': this.options.classIcon});
            }
        } else {
            return this.options.classIcon;
        }
    },

    classInput: function (value) {
        if (value !== undefined) {
            this.options.classInput = value;
            this.$elementFilestyle.find(':text').addClass(this.options.classInput);
        } else {
            return this.options.classInput;
        }
    },

    htmlIcon: function () {
        if (this.options.icon) {
            var colorIcon = '';
            if (this.options.classButton.search(/btn-inverse|btn-primary|btn-danger|btn-warning|btn-success/i) !== -1) {
                colorIcon = ' icon-white ';
            }

            return '<i class="'+colorIcon+this.options.classIcon+'"></i> ';
        } else {
            return '';
        }
    },

    htmlInput: function () {
        if (this.options.input) {
            return '<input type="text" class="'+this.options.classInput+'" style="width: '+this.options.inputWidthPorcent+'% !important;display: inline !important;" disabled> ';
        } else {
            return '';
        }
    },

    constructor: function () {
        var _self = this,
            html = '',
            id = this.$element.attr('id'),
            files = [];

        if (id === '' || !id) {
            id = 'filestyle-'+$('.bootstrap-filestyle').length;
            this.$element.attr({'id': id});
        }

        html = this.htmlInput()+
             '<label for="'+id+'" class="'+this.options.classButton+'">'+
                this.htmlIcon()+
                '<span>'+this.options.buttonText+'</span>'+
             '</label>';

        this.$elementFilestyle = $('<div class="bootstrap-filestyle" style="display: inline;">'+html+'</div>');

        var $label = this.$elementFilestyle.find('label');
        var $labelFocusableContainer = $label.parent();

        $labelFocusableContainer
            .attr('tabindex', "0")
            .keypress(function(e) {
                if (e.keyCode === 13 || e.charCode === 32) {
                    $label.click();
                }
            });

        // hidding input file and add filestyle
        this.$element
            .css({'position':'absolute','left':'-9999px'})
            .attr('tabindex', "-1")
            .after(this.$elementFilestyle);

        // Getting input file value
        this.$element.change(function () {
            var content = '';
            if (this.files === undefined) {
                files[0] = {'name': this.value};
            } else {
                files = this.files;
            }

            for (var i = 0; i < files.length; i++) {
                content += files[i].name.split("\\").pop() + ', ';
            }

            if (content !== '') {
                _self.$elementFilestyle.find(':text').val(content.replace(/\, $/g, ''));
            }
        });

        // Check if browser is Firefox
        if (window.navigator.userAgent.search(/firefox/i) > -1) {
            // Simulating choose file for firefox
            this.$elementFilestyle.find('label').click(function () {
                _self.$element.click();
                return false;
            });
        }
    }
};

var old = $.fn.filestyle;

$.fn.filestyle = function (option, value) {
    var get = '',
        element = this.each(function () {
            if ($(this).attr('type') === 'file') {
                var $this = $(this),
                    data = $this.data('filestyle'),
                    options = $.extend({}, $.fn.filestyle.defaults, option, typeof option === 'object' && option);

                if (!data) {
                    $this.data('filestyle', (data = new Filestyle(this, options)));
                    data.constructor();
                }

                if (typeof option === 'string') {
                    get = data[option](value);
                }
            }
        });

    if (typeof get !== undefined) {
        return get;
    } else {
        return element;
    }
};

$.fn.filestyle.defaults = {
    'buttonText': 'Escolher arquivo',
    'input': true,
    'icon': true,
    'inputWidthPorcent': 65,
    'classButton': 'btn btn-primary',
    'classInput': 'form-control file-input-button',
    'classIcon': 'icon-folder-open'
};

$.fn.filestyle.noConflict = function () {
    $.fn.filestyle = old;
    return this;
};

// Data attributes register
$('.filestyle').each(function () {
    var $this = $(this),
        options = {
            'buttonText': $this.attr('data-buttonText'),
            'input': $this.attr('data-input') === 'false' ? false : true,
            'icon': $this.attr('data-icon') === 'false' ? false : true,
            'classButton': $this.attr('data-classButton'),
            'classInput': $this.attr('data-classInput'),
            'classIcon': $this.attr('data-classIcon')
        };

    $this.filestyle(options);
});
})(window.jQuery);

下面的代码与上面的图片一样

Html

<form>
<div class="row">
<div class="col-lg-6">
<label for="file">
<div class="input-group">
<span class="input-group-btn">
<button class="btn btn-default" type="button">Browse</button>
</span>
<input type="text" class="form-control" id="info" readonly="" style="background: #fff;" placeholder="Search for...">
</div><!-- /input-group -->
</label>
</div><!-- /.col-lg-6 -->
</div>

</div>
<input type="file" style="display: none;" onchange="$('#info').val($(this).val().split(/[\\|/]/).pop()); " name="file" id="file">
</form>

Javascript

<script type="text/javascript">

$(function() {
    $("label[for=file]").click(function(event) {
        event.preventDefault();
        $("#file").click();
    });
});

</script>

我也有同样的问题，我是这样尝试的。

<div>
<button type='button' class='btn btn-info btn-file'>Browse</button>
<input type='file' name='image'/>
</div>

CSS

<style>
.btn-file {
    position:absolute;
}
</style>

JS的

<script>
$(document).ready(function(){
    $('.btn-file').click(function(){
        $('input[name="image"]').click();
    });
});
</script>

注意: 按钮.btn-file必须在与输入文件相同的标签中

希望你找到了最好的解决方案…

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)

我修改了@claviska的答案，并按照我喜欢的方式工作(Bootstrap 3,4未测试):

<label class="btn btn-default">
    <span>Browse</span>
    <input type="file" style="display: none;" onchange="$(this).prev('span').text($(this).val()!=''?$(this).val():'Browse')">
</label>

我使用http://gregpike.net/demos/bootstrap-file-input/demo.html:

$('input[type=file]').bootstrapFileInput();

or

$('.file-inputs').bootstrapFileInput();