bootstrap fileinput插件实现预览上传照片功能

bootstrap fileinput插件实现预览上传照片功能

效果图如下所示：

具体代码如下：

class="fileinput-new">选择图片

class="fileinput-new">选择图片

移除

请选择1M以内图片

bootstrap-fileinput.css文件：（github目前正在维护中，之后所有代码上传至我的github）

/*!

* Jasny Bootstrap v3.1.3 (http://jasny.github.io/bootstrap)

* Copyright 2012-2014 Arnold Daniels

* Licensed under Apache-2.0 (https://github.com/jasny/bootstrap/blob/master/LICENSE)

*/

.btn-file {

position: relative;

overflow: hidden;

vertical-align: middle;

}

.btn-file > input {

position: absolute;

top: 0;

right: 0;

width: 100%;

height: 100%;

margin: 0;

font-size: 23px;

cursor: pointer;

filter: alpha(opacity=0);

opacity: 0;

direction: ltr;

}

.fileinput {

display: inline-block;

margin-bottom: 9px;

}

.fileinput .form-control {

display: inline-block;

padding-top: 7px;

padding-bottom: 5px;

margin-bottom: 0;

vertical-align: middle;

cursor: text;

}

.fileinput .thumbnail {

display: inline-block;

margin-bottom: 5px;

overflow: hidden;

text-align: center;

vertical-align: middle;

}

.fileinput .thumbnail > img {

max-height: 100%;

}

.fileinput .btn {

vertical-align: middle;

}

.fileinput-exists .fileinput-new,

.fileinput-new .fileinput-exists {

display: none;

}

.fileinput-inline .fileinput-controls {

display: inline;

}

.fileinput-filename {

display: inline-block;

overflow: hidden;

vertical-align: middle;

}

.form-control .fileinput-filename {

vertical-align: bottom;

}

.fileinput.input-group {

display: table;

}

.fileinput.input-group > * {

position: relative;

z-index: 2;

}

.fileinput.input-group > .btn-file {

z-index: 1;

}

.fileinput-new.input-group .btn-file,

.fileinput-new .input-group .btn-file {

border-radius: 0 4px 4px 0;

}

.fileinput-new.input-group .btn-file.btn-xs,

.fileinput-new .input-group .btn-file.btn-xs,

.fileinput-new.input-group .btn-file.btn-sm,

.fileinput-new .input-group .btn-file.btn-sm {

border-radius: 0 3px 3px 0;

}

.fileinput-new.input-group .btn-file.btn-lg,

.fileinput-new .input-group .btn-file.btn-lg {

border-radius: 0 6px 6px 0;

}

.form-group.has-warning .fileinput .fileinput-preview {

color: #8a6d3b;

}

.form-group.has-warning .fileinput .thumbnail {

border-color: #faebcc;

}

.form-group.has-error .fileinput .fileinput-preview {

color: #a94442;

}

.form-group.has-error .fileinput .thumbnail {

border-color: #ebccd1;

}

.form-group.has-success .fileinput .fileinput-preview {

color: #3c763d;

}

.form-group.has-success .fileinput .thumbnail {

border-color: #d6e9c6;

}

.input-group-addon:not(:first-child) {

border-left: 0;

}

bootstrap-fileinput.js:

/* ===========================================================

* Bootstrap: fileinput.js v3.1.3

* http://jasny.github.com/bootstrap/javascript/#fileinput

* ===========================================================

* Copyright 2012-2014 Arnold Daniels

*

* Licensed under the Apache License, Version 2.0 (the "License")

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

* ========================================================== */

+function ($) { "use strict";

var isIE = window.navigator.appName == 'Microsoft Internet Explorer'

// FILEUPLOAD PUBLIC CLASS DEFINITION

// =================================

var Fileinput = function (element, options) {

this.$element = $(element)

this.$input = this.$element.find(':file')

if (this.$input.length === 0) return

this.name = this.$input.attr('name') || options.name

this.$hidden = this.$element.find('input[type=hidden][name="' + this.name + '"]')

if (this.$hidden.length === 0) {

this.$hidden = $('').insertBefore(this.$input)

}

this.$preview = this.$element.find('.fileinput-preview')

var height = this.$preview.css('height')

if (this.$preview.css('display') !== 'inline' && height !== '0px' && height !== 'none') {

this.$preview.css('line-height', height)

}

this.original = {

exists: this.$element.hasClass('fileinput-exists'),

preview: this.$preview.html(),

hiddenVal: this.$hidden.val()

}

this.listen()

}

Fileinput.prototype.listen = function() {

this.$input.on('change.bs.fileinput', $.proxy(this.change, this))

$(this.$input[0].form).on('reset.bs.fileinput', $.proxy(this.reset, this))

this.$element.find('[data-trigger="fileinput"]').on('click.bs.fileinput', $.proxy(this.trigger, this))

this.$element.find('[data-dismiss="fileinput"]').on('click.bs.fileinput', $.proxy(this.clear, this))

},

Fileinput.prototype.change = function(e) {

var files = e.target.files === undefined ? (e.target && e.target.value ? [{ name: e.target.value.replace(/^.+\\/, '')}] : []) : e.target.files

e.stopPropagation()

if (files.length === 0) {

this.clear()

return

}

this.$hidden.val('')

this.$hidden.attr('name', '')

this.$input.attr('name', this.name)

var file = files[0]

if (this.$preview.length > 0 && (typeof file.type !== "undefined" ? file.type.match(/^image\/(gif|png|jpeg)$/) : file.name.match(/\.(gif|png|jpe?g)$/i)) && typeof FileReader !== "undefined") {

var reader = new FileReader()

var preview = this.$preview

var element = this.$element

reader.onload = function(re) {

var $img = $('')

$img[0].src = re.target.result

files[0].result = re.target.result

element.find('.fileinput-filename').text(file.name)

// if parent has max-height, using `(max-)height: 100%` on child doesn't take padding and border into account

if (preview.css('max-height') != 'none') $img.css('max-height', parseInt(preview.css('max-height'), 10) - parseInt(preview.css('padding-top'), 10) - parseInt(preview.css('padding-bottom'), 10) - parseInt(preview.css('border-top'), 10) - parseInt(preview.css('border-bottom'), 10))

preview.html($img)

element.addClass('fileinput-exists').removeClass('fileinput-new')

element.trigger('change.bs.fileinput', files)

}

reader.readAsDataURL(file)

} else {

this.$element.find('.fileinput-filename').text(file.name)

this.$preview.text(file.name)

this.$element.addClass('fileinput-exists').removeClass('fileinput-new')

this.$element.trigger('change.bs.fileinput')

}

},

Fileinput.prototype.clear = function(e) {

if (e) e.preventDefault()

this.$hidden.val('')

this.$hidden.attr('name', this.name)

this.$input.attr('name', '')

//ie8+ doesn't support changing the value of input with type=file so clone instead

if (isIE) {

var inputClone = this.$input.clone(true);

this.$input.after(inputClone);

this.$input.remove();

this.$input = inputClone;

} else {

this.$input.val('')

}

this.$preview.html('')

this.$element.find('.fileinput-filename').text('')

this.$element.addClass('fileinput-new').removeClass('fileinput-exists')

if (e !== undefined) {

this.$input.trigger('change')

this.$element.trigger('clear.bs.fileinput')

}

},

Fileinput.prototype.reset = function() {

this.clear()

this.$hidden.val(this.original.hiddenVal)

this.$preview.html(this.original.preview)

this.$element.find('.fileinput-filename').text('')

if (this.original.exists) this.$element.addClass('fileinput-exists').removeClass('fileinput-new')

else this.$element.addClass('fileinput-new').removeClass('fileinput-exists')

this.$element.trigger('reset.bs.fileinput')

},

Fileinput.prototype.trigger = function(e) {

this.$input.trigger('click')

e.preventDefault()

}

// FILEUPLOAD PLUGIN DEFINITION

// ===========================

var old = $.fn.fileinput

$.fn.fileinput = function (options) {

return this.each(function () {

var $this = $(this),

data = $this.data('bs.fileinput')

if (!data) $this.data('bs.fileinput', (data = new Fileinput(this, options)))

if (typeof options == 'string') data[options]()

})

}

$.fn.fileinput.Constructor = Fileinput

// FILEINPUT NO CONFLICT

// ====================

$.fn.fileinput.noConflict = function () {

$.fn.fileinput = old

return this

}

// FILEUPLOAD DATA-API

// ==================

$(document).on('click.fileinput.data-api', '[data-provides="fileinput"]', function (e) {

var $this = $(this)

if ($this.data('bs.fileinput')) return

$this.fileinput($this.data())

var $target = $(e.target).closest('[data-dismiss="fileinput"],[data-trigger="fileinput"]');

if ($target.length > 0) {

e.preventDefault()

$target.trigger('click.bs.fileinput')

}

})

}(window.jQuery);

总结

以上所述是给大家介绍的bootstrap fileinput插件实现预览上传照片功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，会及时回复大家的。在此也非常感谢大家对我们网站的支持！

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