Hbuilder mui 相冊拍照圖片上傳

http://www.bcty365.com/content-146-3648-1.html

使用流程

彈出actionSheet

/*點擊頭像觸發*/
        document.getElementById('headImage').addEventListener('tap', function() {
            if (mui.os.plus) {
                var a = [{
                    title: "拍照"
                }, {
                    title: "從手機相冊選擇"
                }];
                plus.nativeUI.actionSheet({
                    title: "修改用戶頭像",
                    cancel: "取消",
                    buttons: a
                }, function(b) { /*actionSheet 按鈕點擊事件*/
                    switch (b.index) {
                        case 0:
                            break;
                        case 1:
                            getImage(); /*拍照*/
                            break;
                        case 2:
                            galleryImg();/*打開相冊*/
                            break;
                        default:
                            break;
                    }
                })
            }
        }, false);

 

拍照上傳

//拍照
        function getImage() {
            var c = plus.camera.getCamera();
            c.captureImage(function(e) {
                plus.io.resolveLocalFileSystemURL(e, function(entry) {
                    var s = entry.toLocalURL() + "?version=" + new Date().getTime();
                    uploadHead(s); /*上傳圖片*/
                }, function(e) {
                    console.log("讀取拍照文件錯誤：" + e.message);
                });
            }, function(s) {
                console.log("error" + s);
            }, {
                filename: "_doc/head.png"
            })
        }

 

從相冊選圖上傳

//本地相冊選擇
        function galleryImg() {
            plus.gallery.pick(function(a) {
                plus.io.resolveLocalFileSystemURL(a, function(entry) {
                    plus.io.resolveLocalFileSystemURL("_doc/", function(root) {
                        root.getFile("head.png", {}, function(file) {
                            //文件已存在
                            file.remove(function() {
                                console.log("file remove success");
                                entry.copyTo(root, 'head.png', function(e) {
                                        var e = e.fullPath + "?version=" + new Date().getTime();
                                        uploadHead(e); /*上傳圖片*/
                                        //變更大圖預覽的src
                                        //目前僅有一張圖片，暫時如此處理，后續需要通過標准組件實現
                                    },
                                    function(e) {
                                        console.log('copy image fail:' + e.message);
                                    });
                            }, function() {
                                console.log("delete image fail:" + e.message);
                            });
                        }, function() {
                            //文件不存在
                            entry.copyTo(root, 'head.png', function(e) {
                                    var path = e.fullPath + "?version=" + new Date().getTime();
                                    uploadHead(path); /*上傳圖片*/
                                },
                                function(e) {
                                    console.log('copy image fail:' + e.message);
                                });
                        });
                    }, function(e) {
                        console.log("get _www folder fail");
                    })
                }, function(e) {
                    console.log("讀取拍照文件錯誤：" + e.message);
                });
            }, function(a) {}, {
                filter: "image"
            })
        };

 

圖片上傳和壓縮

//上傳頭像圖片
        function uploadHead(imgPath) {
            console.log("imgPath = " + imgPath);
            mainImage.src = imgPath;
            mainImage.style.width = "60px";
            mainImage.style.height = "60px";

            var image = new Image();
            image.src = imgPath;
            image.onload = function() {
                var imgData = getBase64Image(image);
                /*在這里調用上傳接口*/
//              mui.ajax("圖片上傳接口", {
//                  data: {
//
//                  },
//                  dataType: 'json',
//                  type: 'post',
//                  timeout: 10000,
//                  success: function(data) {
//                      console.log('上傳成功');
//                  },
//                  error: function(xhr, type, errorThrown) {
//                      mui.toast('網絡異常，請稍后再試！');
//                  }
//              });
            }
    }
        //將圖片壓縮轉成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 > height) {
                if (width > 100) {
                    height = Math.round(height *= 100 / width);
                    width = 100;
                }
            } else {
                if (height > 100) {
                    width = Math.round(width *= 100 / height);
                    height = 100;
                }
            }
            canvas.width = width;   /*設置新的圖片的寬度*/
            canvas.height = height; /*設置新的圖片的長度*/
            var ctx = canvas.getContext("2d");
            ctx.drawImage(img, 0, 0, width, height); /*繪圖*/
            var dataURL = canvas.toDataURL("image/png", 0.8);
            return dataURL.replace("data:image/png;base64,", "");
        }

總結

 

在使用中，我們可以發現，使用流程是非常清晰的；某種程度來說比原生iOS的使用還要簡單一些。