MUI+Hbuilder之图片上传（六）

document.getElementById("uploadImg").addEventListener("tap", function() {
                var editButtons = new Array();
                if(vm.uploadImgArr.length < 9) {
                    editButtons.push({
                        title: "拍照上传",
                        style: "default"
                    });
                    editButtons.push({
                        title: "从相册选择",
                        style: "default"
                    });
                    plus.nativeUI.actionSheet({
                        cancel: "取消",
                        buttons: editButtons
                    }, function(e) {
                        var index = e.index;
                        switch(index) {
                            case 1:
                                captureImage(); //拍照
                                break;
                            case 2:
                                selectImage(); //相册选择
                                break;
                        }
                    });

                } else {
                    mui.toast("最大允许上传九张图片");
                }

            });

            //选择图片
            function selectImage() {
                plus.gallery.pick(function(path) {
                    //设置最大只能上传9张图片
                    var canUploadLength=9-vm.uploadImgUrlArr.length;
                    if(canUploadLength < path.files.length){
                        mui.toast("最大允许上传九张图片");
                        return false;
                    } 
                    loadImage(path);
                }, function(e) {
                    mui.toast("没有选择图片");
                }, {
                    filter: 'image',
                    multiple: true,
                    system: false
                });
            }
            //确定选择图片
            function loadImage(path) {
                if(typeof path == 'string') {
                    vm.uploadImgArr.push({
                        "status": 0,
                        "url": path
                    });
                    uploadPicture(path);
                } else {
                    path.files.forEach(function(v, k) {
                        vm.uploadImgArr.push({
                            "status": 0,
                            "url": v
                        });
                    });
                    uploadPicture();
                }
            }

            //上传图片 
            function uploadPicture() {
                vm.uploadImgArr.forEach(function(v, k) {
                    if(v.status == '0') {
                        vm.uploadImgArr[k].status=2;
                        var image = new Image();
                        image.src = v.url;
                        image.onload = function() {
                            var imgData = getBase64Image(image);
                            var sendData = {
                                'image': imgData
                            }
                            var AUTH_TOKEN = myStorage.getItem('AUTH_TOKEN');
                            var USER_KEY = myStorage.getItem('USER_KEY');
                            showLoading();
                            mui.ajax(BASE_URL + 'XXXXXXXXX/XXXXXX', {
                                type: 'POST',
                                dataType: 'json',
                                data: sendData,
                                async: true,
                                timeout: 100000, //超时时间设置为10秒；
                                success: function(res) {
                                    if(typeof res == 'string') {
                                        var res = JSON.parse(res);
                                    }

                                    //如果登陆失效
                                    if(res.code == '-1' || res.code == '-2') {
                                        mui.toast(res.msg);
                                        clearUserInfoCache(myStorage)
                                        mui.openWindow({
                                            url: '/view/login.html'
                                        })
                                    } else if(res.code == '-3') {
                                        mui.toast(res.msg);
                                        hideLoading();
                                        return false;
                                    }
                                    if(res.code != '1') {
                                        mui.toast(res.msg);
                                    }
                                    vm.uploadImgArr[k].status=1;
                                    vm.uploadImgUrlArr.push(res.param);//上传成功
                                    hideLoading();
                                },
                                error: function(xhr, type, errorThrown) {
                                    vm.uploadImgArr[k].status=-1;
                                    hideLoading();
                                },
                                headers: {
                                    'access_token': AUTH_TOKEN,
                                    'user_key': USER_KEY,
                                }
                            });
                        }
                    }
                });
            }

            //将图片压缩转成base64 
            function getBase64Image(img) {
                var canvas = document.createElement("canvas");
                var width = img.width;
                var height = img.height;
                // calculate the width and height, constraining the proportions 
                if(width > 1000){
                    height=height/1.5;
                    width=width/1.5;
                }
                
                if(height > 1000){
                    height=height/1.5;
                    width=width/1.5;
                }
                
                canvas.width = width; /*设置新的图片的宽度*/
                canvas.height = height; /*设置新的图片的长度*/
                var ctx = canvas.getContext("2d");
                ctx.drawImage(img, 0, 0, width, height); /*绘图*/
                var dataURL = canvas.toDataURL("image/png", 1);
                return dataURL.replace("data:image/png;base64,", "");
            }

            //拍照
            function captureImage() {
                var cmr = plus.camera.getCamera(2);
                cmr.captureImage(
                    function(path) {
                        //将图片地址转换
                        plus.io.resolveLocalFileSystemURL(path, function(entry) {
                            var newPath = entry.toLocalURL() + "?version=" + Math.random();
                            loadImage(newPath);
                        });
                    },
                    function(error) {
                        mui.toast(error.message);
                    }, {
                        filename: "_documents/"
                    }
                );

            }