jaxFileUpload插件异步上传图片

第一步：引入jquery文件和jaxFileUpload文件

文件位置：https://pan.baidu.com/s/1jHEyIyy

第二步，前端：

    <div class="form-group">
                    <label class="col-xs-12 col-sm-3 col-md-2 control-label"><span class="text-danger"></span> 用户头像</label>
                    <div class="col-sm-9 col-xs-12">
                        <input type="file" name="avatar" id="avatar"  value=""/>
                        <input type="hidden" name="avatar_name" id="avatar_name"  value=""/>

                    </div>
                </div>

                <div class="form-group" id="img_form_group" style="<?php  if(!$member_common['avatar']){echo 'display:none';}?>">
                    <label class="col-xs-12 col-sm-3 col-md-2 control-label"><span class="text-danger"></span> </label>
                    <div class="col-sm-9 col-xs-12">
                        <img width="100px;" <?php echo $member_common['avatar']?'src="/data/upload/member_avatar/'.$member_common['avatar'].'"':'';?> />
                    </div>
                </div>

    function ajaxFileUpload() {
        $.ajaxFileUpload
        (
            {
                url:'/index.php/admin/member/memberAjax?do=upload_avatar',
                secureuri:false,
                fileElementId:'avatar',
                dataType: 'json',
                success: function (data, status)
                {

                    if(data.code !=1){
                        layer.msg(data.msg);
                    }else{
                        $('input[name="avatar_name"]').val(data.data.avatar_name);
                        $("#img_form_group").find('img').attr('src',data.data.avatar_url);
                        $("#img_form_group").show();
                    }

                    $('input[name="avatar"]').bind('change',uploadChange);
                },
                error: function (data, status, e)
                {
                    layer.msg('上传失败');
                    $('input[name="avatar"]').bind('change',uploadChange);
                }
            }
        )
    }
    function uploadChange(){
        var filepatd=$("#avatar").val();
        var extStart=filepatd.lastIndexOf(".");
        var ext=filepatd.substring(extStart,filepatd.length).toUpperCase();
        if(ext!=".PNG"&&ext!=".GIF"&&ext!=".JPG"&&ext!=".JPEG"){
            layer.msg("文件格式错误");
            $("#avatar").attr('value','');
            return false;
        }
        if ($("#avatar").val() == '') return false;
        ajaxFileUpload();
    }

    $(function(){

        $('#avatar').change(function(){uploadChange()});
}）

第三步，ci框架后端：

  case 'upload_avatar':
                if (is_uploaded_file($_FILES['avatar']['tmp_name'])) {
                    try{
                        $img_arr = imgUpload(
                            array(
                                'path' => FCPATH . 'data/upload/member_avatar',
                                'field' => 'avatar',
                                'pre' => 'avatar_',
                            )
                        );
                        $file_name=$img_arr[0]['file_name'];
                        $file_name = (string) $file_name;
                        if(!is_file(FCPATH.DATA_UPLOAD.'member_avatar/'.$file_name)){
                            throw new Exception("上传失败");
                        }

                        $data=array();
                        $data['avatar_name']=$file_name;
                        $data['avatar_url']=getMemberAvatar($file_name);
                        $this->output(1,'上传成功', $data);
                    }catch(Exception $e){
                        $error_msg=$e->getMessage();
                        $error_msg=str_replace('<p>','',$error_msg);
                        $error_msg=str_replace('</p>','',$error_msg);
                        $this->output(400,$error_msg);
                    }
                }else{
                    $this->output(400,"请选择上传的图片");
                }
                break;

第四步：

错误处理：http://blog.csdn.net/imlinjunjie/article/details/49403199