• ajax 图片上传


    1.前端

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>
    
    <!DOCTYPE html>
    
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <script src="jquery-3.2.1.min.js"></script>
        <script src="ajaxfileupload.js" type="text/javascript"></script>
        <script type="text/javascript">
            $(function () {
                $(":button").click(function () {
                    ajaxFileUpload();
                })
            })
            function ajaxFileUpload() {
                $.ajaxFileUpload
                (
                    {
                        url: 'WebForm2.aspx', //用于文件上传的服务器端请求地址
                        secureuri: false, //是否需要安全协议,一般设置为false
                        fileElementId: 'file1', //文件上传域的ID
                        dataType: 'json', //返回值类型 一般设置为json
                        success: function (data, status)  //服务器成功响应处理函数
                        {
                            $("#img1").attr("src", data.imgurl);
                            if (typeof (data.error) != 'undefined') {
                                if (data.error != '') {
                                    alert(data.error);
                                } else {
                                    alert(data.msg);
                                }
                            }
                        },
                        error: function (data, status, e)//服务器响应失败处理函数
                        {
                            alert(e);
                        }
                    }
                )
                return false;
            }
        </script>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
        <title></title>
    </head>
    <body>
        <form id="form1" runat="server">
        <div>
            <p><input type="file" id="file1" name="file" /></p>
        <input type="button" value="上传" />
        <p><img id="img1" alt="上传成功啦" src="" /></p>
        </div>
        </form>
    </body>
    </html>
    

      

    jQuery.extend({
        createUploadIframe: function (id, uri) {
            //create frame
            var frameId = 'jUploadFrame' + id;
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
            if (window.ActiveXObject) {
                if (typeof uri == 'boolean') {
                    iframeHtml += ' src="' + 'javascript:false' + '"';
    
                }
                else if (typeof uri == 'string') {
                    iframeHtml += ' src="' + uri + '"';
    
                }
            }
            iframeHtml += ' />';
            jQuery(iframeHtml).appendTo(document.body);
    
            return jQuery('#' + frameId).get(0);
        },
        createUploadForm: function (id, fileElementId) {
            //create form	
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
            var oldElement = jQuery('#' + fileElementId);
            var newElement = jQuery(oldElement).clone();
            jQuery(oldElement).attr('id', fileId);
            jQuery(oldElement).before(newElement);
            jQuery(oldElement).appendTo(form);
            //set attributes
            jQuery(form).css('position', 'absolute');
            jQuery(form).css('top', '-1200px');
            jQuery(form).css('left', '-1200px');
            jQuery(form).appendTo('body');
            return form;
        },
    
        ajaxFileUpload: function (s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = new Date().getTime();
            var form = jQuery.createUploadForm(id, s.fileElementId);
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;
            // Watch for a new set of requests
            if (s.global && !jQuery.active++) {
                jQuery.event.trigger("ajaxStart");
            }
            var requestDone = false;
            // Create the request object
            var xml = {};
            if (s.global)
                jQuery.event.trigger("ajaxSend", [xml, s]);
            // Wait for a response to come back
            var uploadCallback = function (isTimeout) {
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
    
                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {
                            // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType);
                            // If a local callback was specified, fire it and pass it the data
                            if (s.success)
                                s.success(data, status);
    
                            // Fire the global callback
                            if (s.global)
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                        } else
                            jQuery.handleError(s, xml, status);
                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }
    
                    // The request was completed
                    if (s.global)
                        jQuery.event.trigger("ajaxComplete", [xml, s]);
    
                    // Handle the global AJAX counter
                    if (s.global && ! --jQuery.active)
                        jQuery.event.trigger("ajaxStop");
    
                    // Process result
                    if (s.complete)
                        s.complete(xml, status);
    
                    jQuery(io).unbind();
    
                    setTimeout(function () {
                        try {
                            jQuery(io).remove();
                            jQuery(form).remove();
    
                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }
    
                    }, 100);
    
                    xml = null;
    
                }
            };
            // Timeout checker
            if (s.timeout > 0) {
                setTimeout(function () {
                    // Check to see if the request is still happening
                    if (!requestDone) uploadCallback("timeout");
                }, s.timeout);
            }
            try {
    
                var form = jQuery('#' + formId);
                jQuery(form).attr('action', s.url);
                jQuery(form).attr('method', 'POST');
                jQuery(form).attr('target', frameId);
                if (form.encoding) {
                    jQuery(form).attr('encoding', 'multipart/form-data');
                }
                else {
                    jQuery(form).attr('enctype', 'multipart/form-data');
                }
                jQuery(form).submit();
    
            } catch (e) {
                jQuery.handleError(s, xml, null, e);
            }
    
            jQuery('#' + frameId).load(uploadCallback);
            return { abort: function () { } };
    
        },
    
        // handleError 方法在jquery1.4.2之后移除了,此处重写改方法
        handleError: function (s, xhr, status, e) {
            // If a local callback was specified, fire it
            if (s.error) {
                s.error.call(s.context || s, xhr, status, e);
            }
    
            // Fire the global callback
            if (s.global) {
                (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
            }
        },
    
        uploadHttpData: function (r, type) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // If the type is "script", eval it in global context
            if (type == "script")
                jQuery.globalEval(data);
            // Get the JavaScript object, if JSON is used.
            if (type == "json") {
                eval("data = " + data);
            }
            // evaluate scripts within html
            if (type == "html")
                jQuery("<div>").html(data).evalScripts();
    
            return data;
        }
    });
    

      

  • 相关阅读:
    mysql基础整理01
    继承、接口、static、abstract
    重载与重写
    单例模式
    我的程序人生
    Idea的Maven项目引入模块
    测试单元测试完毕关闭jvm
    java线程
    logback日志的美化
    Netty中消除开始的日志消息修改日志级别
  • 原文地址:https://www.cnblogs.com/muxueyuan/p/6756020.html
Copyright © 2020-2023  润新知