The bootstrap fileinput plug-in allows you to preview and upload photos,

The bootstrap fileinput plug-in allows you to preview and upload photos,

As follows:

 

The Code is as follows:

<! DOCTYPE html> 
Bootstrap-fileinput.css files :( github is currently under maintenance, and then all the code is uploaded to my 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 = $('<input type="hidden">').insertBefore(this.$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);
Summary
The above section describes how to use the bootstrap fileinput plug-in to preview and upload photos. I hope it will help you. If you have any questions, please leave a message and I will reply to you in a timely manner. Thank you very much for your support for the help House website!