PHP+ajaxfileupload+jcrop插件完美实现头像上传剪裁

昨天花了点时间整合了一下头像插件 东拼西凑的成果 先来看下效果

1.先使用ajaxfileupload插件做异步上传。这个地方我本来想做个上传进度的效果，但技术有限失败了。上传按钮我还做了一个文件大小的限制，但是由于浏览器兼容性的问题，不完美在ie6--ie9之间还有很多问题需要解决

getfilesize函数是用于判断文件大小的函数

function getfilesize(filename) {
                var bytesize = 0;
                //console.log($("#" + filename).val());
                if($("#" + filename)[0].files) {
                    var bytesize  = $("#" + filename)[0].files[0].size;
                }else {
    //此处由于有浏览器兼容问题 还没完成大小判断的逻辑
                }
                //alert(bytesize);
                bytesize = math.ceil(bytesize / 1024) //kb
                return bytesize;//kb
            }

2.按钮上传事件绑定

$("#btnupload").click(function () {
                var allowimgagetype = ['jpg', 'jpeg', 'png', 'gif'];
                var file = $("#file1").val();
                //获取大小
                var bytesize = getfilesize('file1');
                //获取后缀
                if (file.length > 0) {
                    if(bytesize > 2048) {
                        alert("上传的附件文件不能超过2m");
                        return;
                    }
                    var pos = file.lastindexof(".");
                    //截取点之后的字符串
                    var ext = file.substring(pos + 1).tolowercase();
                    //console.log(ext);
                    if($.inarray(ext, allowimgagetype) != -1) {
                        ajaxfileupload();
                    }else {
                        alert("请选择jpg,jpeg,png,gif类型的图片");
                    }
                }
                else {
                    alert("请选择jpg,jpeg,png,gif类型的图片");
                }
            });

3.在上传成功后返回图片路径，并初始化图片裁剪。图片裁剪就直接用ajax请求到php

function ajaxfileupload() {
                $.ajaxfileupload({
                    url: 'action.php', //用于文件上传的服务器端请求地址
                    secureuri: false, //一般设置为false
                    fileelementid: 'file1', //文件上传空间的id属性  <input type="file" id="file" name="file" />
                    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
                    {
                        //var json = eval('(' + data + ')');
                        //alert(data);
                        $("#picture_original>img").attr({src: data.src, width: data.width, height: data.height});
                        $('#imgsrc').val(data.path);
                        //alert(data.msg);

                        //同时启动裁剪操作，触发裁剪框显示，让用户选择图片区域
                        var cutter = new jquery.utrialavatarcutter({
                                //主图片所在容器id
                                content : "picture_original",
                                //缩略图配置,id:所在容器id;width,height:缩略图大小
                                purviews : [{id:"picture_200",width:200,height:200},{id:"picture_50",width:50,height:50},{id:"picture_30",width:30,height:30}],
                                //选择器默认大小
                                selector : {width:200,height:200},
                                showcoords : function(c) { //当裁剪框变动时，将左上角相对图片的x坐标与y坐标 宽度以及高度
                                    $("#x1").val(c.x);
                                    $("#y1").val(c.y);
                                    $("#cw").val(c.w);
                                    $("#ch").val(c.h);
                                },
                                cropattrs : {boxwidth: 500, boxheight: 500}
                            }
                        );
                        cutter.reload(data.src);
                        $('#div_avatar').show();
                    },
                    error: function (data, status, e)//服务器响应失败处理函数
                    {
                        alert(e);
                    }
                })
                return false;
            }

            $('#btncrop').click(function() {
                $.getjson('action2.php', {x: $('#x1').val(), y: $('#y1').val(), w: $('#cw').val(), h: $('#ch').val(), src: $('#imgsrc').val()}, function(data) {
                    alert(data.msg);
                });
                return false;
            });

4.html文件代码如下

<body>
    <p><input type="file" id="file1" name="file1" /></p>
    <input type="button" value="上传" id="btnupload"/>
    <div style="display:none;overflow:hidden" id="div_avatar">
        <div style="width:500px;height:500px;overflow:hidden;float:left;" id="picture_original"><img alt="" src="" /></div>
        <div id="picture_200" style="float:left;margin-left:20px"></div>
        <div id="picture_50" style="float:left;margin-left:20px"></div>
        <div id="picture_30" style="float:left;margin-left:20px"></div>
        <input type="hidden" id="x1" name="x1" value="0" />
        <input type="hidden" id="y1" name="y1" value="0" />
        <input type="hidden" id="cw" name="cw" value="0" />
        <input type="hidden" id="ch" name="ch" value="0" />
        <input type="hidden" id="imgsrc" name="imgsrc" />
        <input type="button" value="裁剪上传" id="btncrop"/>
    </div>
</body>

现在还很粗糙，功能还有很多需要完善的地方。大家有兴趣的话，就拿去使用吧。如果完善了进度条和文件大小的功能，记得也分享给我一份哦。

附上源码