在大多数app项目中，都需要对用户头像的上传，之前做web开发的时候，我主要是通过input type=file的标签实现的，上传后，使用php对图片进行裁剪，这种方式比较传统简单。
此次app开发中我需要做到用户选择本地相册或者进行拍照，对照片进行裁剪，最后更新本地头像和服务器端的图片
我将要结合mui，cropper，jquery开发
实现思路：
1.用户点击头像，打开actionsheet
2.选择图片或者拍照后返回的图片绝对地址传入单独的裁剪页面，跳转到裁剪页面
3.裁剪页面裁剪后选择确认则将裁减后图片（注意：canvas使用base64，新图片不存在url）保存到localstorage中（其实是把整个图片保存到本地数据库中）
4.触发一个更新上一页头像的事件，返回上一页
5.看到图片已经更改
6.保存，上传到服务器（json）
实现工具和插件，直接看代码：
js
<script type="text/javascript" src="../js/jquery-1.11.2.min.js"></script> <script src="../js/mui.min.js"></script> <script type="text/javascript" src="../js/exif.js"></script> <script src="../js/cropper.min.js"></script> <script src="../js/fastclick.js"></script>
css
<link href="../css/mui.min.css" rel="stylesheet" /> <link href="../css/iconfont.css" rel="stylesheet" /> <link href="../css/cropper.css" rel="stylesheet" />
这里我们主要使用了一个cropper.js的插件，自行百度下载，目前比较好用的插件只有这个，大神的话自己写一个吧
注意cropper必须使用jquery，而jquery比较臃肿，在其他mui中尽量不要引入，我也是迫不得已，使用jq并非我本意
fastclcik是加速点击触发，一般在手机端开发其实用不到，因为一般使用tap，这里我加了进去，似乎对裁剪图片时手势操作有帮助，(+_+)?，不加也没有影响，测试过
iconfont是按钮图标
exif是可以检测图片拍摄时采用横向还是纵向
接下来可以开发了：
一共两个页面，
headinfo.html——编辑页面
cropper.html——裁剪页面
headinfo.html
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>我的资料</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link href="../css/mui.min.css" rel="stylesheet" />
<link href="../css/style.css" rel="stylesheet" />
<style type="text/css">
.head {
height: 40px;
}
.head {
height: 40px;
}
#head {
line-height: 40px;
}
.head-img {
width: 40px;
height: 40px;
}
#head-img1 {
position: absolute;
bottom: 10px;
right: 40px;
width: 40px;
height: 40px;
}
.mui-fullscreen {
position: fixed;
z-index: 20;
background-color: #000;
}
</style>
</head>
<body>
<header class="mui-bar mui-bar-nav">
<button type="button" class="mui-left mui-action-back mui-btn mui-btn-link mui-btn-nav mui-pull-left">
<span class="mui-icon mui-icon-left-nav"></span>完成
</button>
<h1 class="mui-title">头信息</h1>
</header>
<div class="mui-content">
<ul class="mui-table-view">
<li class="mui-table-view-cell">
<a id="head" class="mui-navigate-right">个人头像
<span class="mui-pull-right head">
<img class="head-img mui-action-preview" id="head-img1" src=""/>
</span>
</a>
</li>
<li class="mui-table-view-cell">
<a class="mui-navigate-right">
Item 2
</a>
</li>
<li class="mui-table-view-cell">
<a class="mui-navigate-right">
Item 3
</a>
</li>
</ul>
</div>
<script src="../js/mui.min.js"></script>
<script src="../js/app.js"></script>
<script type="text/javascript">
(function($) {
$.init();
$.plusReady(function() {
//初始化头像，和预览图
setTimeout(function() {
defaultImg();
setTimeout(function() {
initImgPreview();
}, 200);
}, 0);
//弹出菜单
mui(".mui-table-view-cell").on("tap", "#head", function(e) {
if(mui.os.plus) {
var a = [{
title: "拍照"
}, {
title: "从手机相册选择"
}];
plus.nativeUI.actionSheet({
title: "修改头像",
cancel: "取消",
buttons: a
}, function(b) {
switch(b.index) {
case 0:
break;
case 1:
getImage();
break;
case 2:
galleryImg();
break;
default:
break
}
})
}
});
});
/*
* 图片都保存到沙盒：_doc下
*/
//拍照
function getImage() {
var c = plus.camera.getCamera();
c.captureImage(function(e) {
//存储到本地
plus.io.resolveLocalFileSystemURL(e, function(entry) {
cutImage(entry.toLocalURL());//裁剪图片，传入绝对地址
}, function(e) {
console.log("读取拍照文件错误：" + e.message);
});
}, function(s) {
console.log("error" + s);
}, {
filename: "_doc/head.jpg"
})
}
//相册
function galleryImg() {
plus.gallery.pick(function(a) {
plus.io.resolveLocalFileSystemURL(a, function(entry) { //entry为图片原目录（相册）流
cutImage(entry.toLocalURL());
}, function(e) {
console.log("读取图片错误：" + e.message);
});
}, function(a) {}, {
filter: "image"
})
};
//设置默认头像
function defaultImg() {
var my_icon = app.getHeadImg();
if(my_icon != "") {
document.getElementById("head-img1").src = my_icon;
} else {
document.getElementById("head-img1").src = ‘../images/my_icon.jpg‘;
}
}
//预览图像
document.getElementById("head-img1").addEventListener(‘tap‘, function(e) {
e.stopPropagation(); //阻止冒泡
});
function initImgPreview() {
var imgs = document.querySelectorAll("img.mui-action-preview");
imgs = mui.slice.call(imgs);
if(imgs && imgs.length > 0) {
var slider = document.createElement("div");
slider.setAttribute("id", "__mui-imageview__");
slider.classList.add("mui-slider");
slider.classList.add("mui-fullscreen");
slider.style.display = "none";
slider.addEventListener("tap", function() {
slider.style.display = "none";
});
slider.addEventListener("touchmove", function(event) {
event.preventDefault();
})
var slider_group = document.createElement("div");
slider_group.setAttribute("id", "__mui-imageview__group");
slider_group.classList.add("mui-slider-group");
imgs.forEach(function(value, index, array) {
//给图片添加点击事件，触发预览显示；
value.addEventListener(‘tap‘, function() {
slider.style.display = "block";
_slider.refresh();
_slider.gotoItem(index, 0);
})
var item = document.createElement("div");
item.classList.add("mui-slider-item");
var a = document.createElement("a");
var img = document.createElement("img");
img.setAttribute("src", value.src);
a.appendChild(img)
item.appendChild(a);
slider_group.appendChild(item);
});
slider.appendChild(slider_group);
document.body.appendChild(slider);
var _slider = mui(slider).slider();
}
}
//裁剪图片
function cutImage(path) {
$.openWindow({
url: ‘cropper.html‘,
id: ‘cropper‘,
extras: {
path: path,
},
show: {
aniShow: ‘zoom-fade-in‘,
duration: 800
},
waiting: {
autoShow: true
}
});
}
//更新用户头像，主要是裁剪页面裁剪完后触发的
function update_head_img() {
var my_icon = app.getHeadImg(); //返回的是base64图片格式
if(my_icon != "") {
document.getElementById("head-img1").src = my_icon;
document.querySelector("#__mui-imageview__group .mui-slider-item img").src = my_icon;
}
}
window.addEventListener("updateHeadImg", update_head_img); //添加自定义事件，其他页面调用
})(mui);
</script>
</body>
</html>
cropper.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>裁剪头像</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<link href="../css/mui.min.css" rel="stylesheet" />
<link href="../css/iconfont.css" rel="stylesheet" />
<link href="../css/cropper.css" rel="stylesheet" />
<style type="text/css">
body {
background-color: #000000;
}
#cropper-example-1 {
background-color: #000000;
height: 93%;
width: 100%;
position: absolute;
}
#quxiao,
#xuanzhuan,
#xuanqu {
font-size: 20px;
}
.divbut {
width: 100%;
text-align: center;
position: fixed;
z-index: 2;
bottom: 0px;
background-color: #000000;
height: 7.5%;
line-height: 50px;
}
.divbut>div:first-child {
float: left;
width: 20%;
}
.divbut>div:last-child {
float: right;
width: 20%;
}
img#im {
height: 100%;
width: 100%;
}
</style>
</head>
<body>
<div id="cropper-example-1" class="mui-hidden">
<img id="im" alt="Picture" />
</div>
<div class="divbut">
<div>
<p id="quxiao" class="iconfont icon-quxiao"></p>
</div>
<div>
<p id="xuanqu" class="iconfont icon-queding"></p>
</div>
</div>
<img src="" alt="" class="mui-hidden" id="im_exif" />
<script type="text/javascript" src="../js/jquery-1.11.2.min.js"></script>
<script src="../js/mui.min.js"></script>
<script type="text/javascript" src="../js/exif.js"></script>
<script src="../js/cropper.min.js"></script>
<script src="../js/fastclick.js"></script>
<script src="../js/app.js"></script>
<script>
$(function() {
//尽量用一下fastclick
FastClick.attach(document.body);
! function() {
var i = {
aspectRatio: 1 / 1
};
}()
});
(function(c) {
var Cro = function() {}
c.extend(Cro.prototype, {
orientation: null,
urldata: null,
view: null,
num: 0,
sbx: null,
sby: null,
n: 0,
onReady: function() {
var that = this;
mui.init();
that.bindEvent();
that.view = plus.webview.currentWebview();
var img = document.getElementById("im_exif");
img.src = that.view.path;
img.addEventListener("load", function() {
//exif调整图片的横竖
EXIF.getData(this, function() {
var orientation = EXIF.getAllTags(this).Orientation;
$("#im").attr("src", that.loadcopyImg(img, orientation));
document.getElementById("cropper-example-1").classList.remove("mui-hidden"); //显示裁剪区域
that.cropperImg();
});
})
},
cropperImg: function() {
var that = this;
$(‘#cropper-example-1 > img‘).cropper({
aspectRatio: 1 / 1,
autoCropArea: 1,
strict: true,
background: false,
guides: false,
highlight: false,
dragCrop: false,
movable: false,
resizable: false,
crop: function(data) {
that.urldata = that.base64(data);
}
});
},
loadcopyImg: function(img, opt) {
var that = this;
var canvas = document.createElement("canvas");
var square = 500;
var imageWidth, imageHeight;
if(img.width > img.height) {
imageHeight = square;
imageWidth = Math.round(square * img.width / img.height);
} else {
imageHeight = square; //this.width;
imageWidth = Math.round(square * img.width / img.height);
}
canvas.height = imageHeight;
canvas.width = imageWidth;
if(opt == 6) {
that.num = 90;
} else if(opt == 3) {
that.num = 180;
} else if(opt == 8) {
that.num = 270;
}
if(that.num == 360) {
that.num = 0;
}
var ctx = canvas.getContext("2d");
ctx.translate(imageWidth / 2, imageHeight / 2);
ctx.rotate(that.num * Math.PI / 180);
ctx.translate(-imageWidth / 2, -imageHeight / 2);
ctx.drawImage(img, 0, 0, imageWidth, imageHeight);
var dataURL = canvas.toDataURL("image/jpeg", 1);
return dataURL;
},
bindEvent: function() {
var that = this;
document.getElementById("quxiao").addEventListener("tap", function() {
mui.back(); //取消就直接返回
});
document.getElementById("xuanqu").addEventListener("tap", function() {
app.setHeadImg(that.urldata);
var preView = plus.webview.getWebviewById(‘user/headinfo‘);
mui.fire(preView, ‘updateHeadImg‘); //触发上一个页面刷新图片事件
mui.back();
});
},
base64: function(data) {
var that = this;
var img = document.getElementById("im");
var canvas = document.createElement("canvas");
//像素
canvas.height = 500;
canvas.width = 500;
var bx = data.x;
var by = data.y;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, bx, by, data.width, data.height, 0, 0, 500, 500);
var dataURL = canvas.toDataURL("image/jpeg", 1.0); //第二个参数是质量
return dataURL;
}
});
var cro = new Cro();
c.plusReady(function() {
cro.onReady();
})
})(mui)
</script>
</body>
</html>
效果图：
时间： 2024-10-11 03:32:09