bootstrap+fileinput插件实现可预览上传照片功能
图片.png
实际项目中运用：
图片.png
功能：实现上传图片，更改上传图片，移除图片的功能
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://www.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);
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原文作者：祈澈姑娘
原文链接：https://www.jianshu.com/u/05f416aefbe1
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