微信小程序仿朋友圈发布动态功能

            仿照微信朋友圈做了一个界面如下，先看效果：
1、点开界面

2、选择图片

3、点击上传

4、动态显示

第一个页面的wxml：


<view class='page'>
 <textarea class='text' bindinput="input" placeholder="分享动态" auto-height/>
 <view class="image_content">
 <view class='image' wx:for="{{img_url}}">
  <image class="moment_img" src="{{item}}"></image>
 </view>
 <view class='image' style='display:{{hideAdd?"none":"block"}}'>
  <image bindtap="chooseimage" class="moment_img" src='../../images/add.jpg'></image>
 </view>
 </view>
 <button bindtap="send" style='margin-right:5px;margin-left:5px'>发布</button>
</view>

第一个页面的wcss：


.page{
 padding: 20px
}
.text{
 width: 100%;
 margin-bottom: 40px;
 font-size: 20px;
 padding: 5px
}
.image{
 width:31%;
 height: 100px;
 padding: 2px
}
.moment_img{
 width: 98px;
 height: 98px;
}
.image_content{
 width: 100%;
 display: flex;
 flex-wrap: wrap;
 margin-bottom: 20px
}

第一个页面的js：


Page({
 data: {
 img_url: [],
 content:''
 },
 onLoad: function (options) {
 },
 input:function(e){
 this.setData({
  content:e.detail.value
 })
 },
 chooseimage:function(){
 var that = this;
 wx.chooseImage({
  count: 9, // 默认9 
  sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有 
  sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有 
  success: function (res) {
  if (res.tempFilePaths.length>0){
   //图如果满了9张，不显示加图
   if (res.tempFilePaths.length == 9){
   that.setData({
    hideAdd:1
   })
   }else{
   that.setData({
    hideAdd: 0
   })
   }
   //把每次选择的图push进数组
   let img_url = that.data.img_url;
   for (let i = 0; i < res.tempFilePaths.length; i++) {
   img_url.push(res.tempFilePaths[i])
   }
   that.setData({
   img_url: img_url
   })
  }
  }
 }) 
 },
 //发布按钮事件
 send:function(){
 var that = this;
 var user_id = wx.getStorageSync('userid')
 wx.showLoading({
  title: '上传中',
 })
 that.img_upload()
 },
 //图片上传
 img_upload: function () {
 let that = this;
 let img_url = that.data.img_url;
 let img_url_ok = [];
 //由于图片只能一张一张地上传，所以用循环
 for (let i = 0; i < img_url.length; i++) {
  wx.uploadFile({
  //路径填你上传图片方法的地址
  url: 'http://wechat.homedoctor.com/Moments/upload_do',
  filePath: img_url[i],
  name: 'file',
  formData: {
   'user': 'test'
  },
  success: function (res) {
   console.log('上传成功');
   //把上传成功的图片的地址放入数组中
   img_url_ok.push(res.data)
   //如果全部传完，则可以将图片路径保存到数据库
   if (img_url_ok.length == img_url.length) {
   var userid = wx.getStorageSync('userid');
   var content = that.data.content;
   wx.request({
    url: 'http://wechat.homedoctor.com/Moments/adds',
    data: {
    user_id: userid,
    images: img_url_ok,
    content: content,
    },
    success: function (res) {
    if (res.data.status == 1) {
     wx.hideLoading()
     wx.showModal({
     title: '提交成功',
     showCancel: false,
     success: function (res) {
      if (res.confirm) {
      wx.navigateTo({
       url: '/pages/my_moments/my_moments',
      })
      }
     }
     })
    }
    }
   })
   }
  },
  fail: function (res) {
   console.log('上传失败')
  }
  })
 }
 } 
})

我认为难点在于请求后台上传图片的方法，虽然我也没搞懂，不过直接使用，他会返回放在服务器的哪个位置，代码如下：



public function upload_do(){
  extract(generateRequestParamVars());
  /**
   * upload.php
   *
   * Copyright 2013, Moxiecode Systems AB
   * Released under GPL License.
   *
   * License: http://www.plupload.com/license
   * Contributing: http://www.plupload.com/contributing
   */
  #!! IMPORTANT:
  #!! this file is just an example, it doesn't incorporate any security checks and
  #!! is not recommended to be used in production environment as it is. Be sure to
  #!! revise it and customize to your needs.
  // Make sure file is not cached (as it happens for example on iOS devices)
  header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
  header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  header("Cache-Control: no-store, no-cache, must-revalidate");
  header("Cache-Control: post-check=0, pre-check=0", false);
  header("Pragma: no-cache");
  echo $fileName;
  // Support CORS
  // header("Access-Control-Allow-Origin: *");
  // other CORS headers if any...
  if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
   exit; // finish preflight CORS requests here
  }
  if ( !empty($_REQUEST[ 'debug' ]) ) {
   $random = rand(0, intval($_REQUEST[ 'debug' ]) );
   if ( $random === 0 ) {
    header("HTTP/1.0 500 Internal Server Error");
    exit;
   }
  }
  // header("HTTP/1.0 500 Internal Server Error");
  // exit;
  // 5 minutes execution time
  @set_time_limit(5 * 60);
  // Uncomment this one to fake upload time
  usleep(5000);
  // Settings
  // $targetDir = ini_get("upload_tmp_dir") . DIRECTORY_SEPARATOR . "plupload";
  $targetDir = C('CACHE_DIR').DIRECTORY_SEPARATOR.'Uploads'.DIRECTORY_SEPARATOR.'Tmps';
  $uploadDir = C('CACHE_DIR').DIRECTORY_SEPARATOR.'Uploads'.DIRECTORY_SEPARATOR.'Tmps'.DIRECTORY_SEPARATOR.date('Y').DIRECTORY_SEPARATOR.date('m').DIRECTORY_SEPARATOR.date('d');
  $uploadUrl = '/Uploads/Tmps/'.date('Y').'/'.date('m').'/'.date('d');
  //创建文件夹
  if(!is_dir($uploadDir)){
   @mkdir($uploadDir,0777,true);
  }
  $cleanupTargetDir = true; // Remove old files
  $maxFileAge = 5 * 3600; // Temp file age in seconds
  // Create target dir
  if (!file_exists($targetDir)) {
   @mkdir($targetDir);
  }
  // Create target dir
  if (!file_exists($uploadDir)) {
   @mkdir($uploadDir);
  }
  // Get a file name
  if (isset($_REQUEST["name"])) {
   $fileName = $_REQUEST["name"];
  } elseif (!empty($_FILES)) {
   $fileName = $_FILES["file"]["name"];
  } else {
   $fileName = uniqid();
  }
  //$fileName = uniqid("file_").'.'.pathinfo($fileName, PATHINFO_EXTENSION);
  $extension=pathinfo($fileName, PATHINFO_EXTENSION);
  if($extension){
   $fileName = uniqid().'.'.$extension;
  }else{
   $fileName = uniqid();
  }
  $md5File = @file('md5list.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
  $md5File = $md5File ? $md5File : array();
  if (isset($_REQUEST["md5"]) && array_search($_REQUEST["md5"], $md5File ) !== FALSE ) {
   die('{"jsonrpc" : "2.0", "result" : null, "id" : "id", "exist": 1}');
  }
  $filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;
  $uploadPath = $uploadDir . DIRECTORY_SEPARATOR . $fileName;
  // Chunking might be enabled
  $chunk = isset($_REQUEST["chunk"]) ? intval($_REQUEST["chunk"]) : 0;
  $chunks = isset($_REQUEST["chunks"]) ? intval($_REQUEST["chunks"]) : 1;
  // echo $_REQUEST["chunks"];
  // echo $_REQUEST["chunk"];
  // Remove old temp files
  if ($cleanupTargetDir) {
   if (!is_dir($targetDir) || !$dir = opendir($targetDir)) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 100, "message": "Failed to open temp directory."}, "id" : "id"}');
   }
   while (($file = readdir($dir)) !== false) {
    $tmpfilePath = $targetDir . DIRECTORY_SEPARATOR . $file;
    // If temp file is current file proceed to the next
    if ($tmpfilePath == "{$filePath}_{$chunk}.part" || $tmpfilePath == "{$filePath}_{$chunk}.parttmp") {
     continue;
    }
    // Remove temp file if it is older than the max age and is not the current file
    if (preg_match('/\.(part|parttmp)$/', $file) && (@filemtime($tmpfilePath) < time() - $maxFileAge)) {
     @unlink($tmpfilePath);
    }
   }
   closedir($dir);
  }
  // Open temp file
  if (!$out = @fopen("{$filePath}_{$chunk}.parttmp", "wb")) {
   die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
  }
  if (!empty($_FILES)) {
   if ($_FILES["file"]["error"] || !is_uploaded_file($_FILES["file"]["tmp_name"])) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}');
   }
   // Read binary input stream and append it to temp file
   if (!$in = @fopen($_FILES["file"]["tmp_name"], "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
   }
  } else {
   if (!$in = @fopen("php://input", "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
   }
  }
  while ($buff = fread($in, 4096)) {
   fwrite($out, $buff);
  }
  @fclose($out);
  @fclose($in);
  rename("{$filePath}_{$chunk}.parttmp", "{$filePath}_{$chunk}.part");
  $index = 0;
  $done = true;
  for( $index = 0; $index < $chunks; $index++ ) {
   if ( !file_exists("{$filePath}_{$index}.part") ) {
    $done = false;
    break;
   }
  }
  if ( $done ) {
   if (!$out = @fopen($uploadPath, "wb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
   }
   if ( flock($out, LOCK_EX) ) {
    for( $index = 0; $index < $chunks; $index++ ) {
     if (!$in = @fopen("{$filePath}_{$index}.part", "rb")) {
      break;
     }
     while ($buff = fread($in, 4096)) {
      fwrite($out, $buff);
     }
     @fclose($in);
     @unlink("{$filePath}_{$index}.part");
    }
    flock($out, LOCK_UN);
   }
   @fclose($out);
  }
  // Return Success JSON-RPC response
  //die('{"jsonrpc" : "2.0", "result" : null, "id" : "id"}');
  die($uploadUrl .'/'. $fileName);
 }

这个函数会将图片保存到项目文件的Cache目录的Upload/....什么什么的目录下。而且也返回了这个完整路径跟前端，前端拿着这个再去请求后台接口保存这个路径。保存图片的后台代码如下：
首先是控制层：


public function adds()
 {
  try{
   D(self::$MOMENTS_MODEL)->adds();
   $ajaxReturnData['status'] = 1;
   $ajaxReturnData['message'] = 'success';
  }catch (\Exception $e){
   $ajaxReturnData['status'] = 0;
   $ajaxReturnData['message'] = 'fail';
  }
  $this->ajaxReturn($ajaxReturnData);
 }

然后是模型层：（我之前犯傻的是，应该直接把数组，也就是$images直接保存进去就行了，不用json_encode()）


public function adds()
 {
  extract(generateRequestParamVars());
  $user = D(self::$WECHAT_USER)->find($user_id);
  $data = [];
  $data['user_id'] = $user_id;
  $data['user_name'] = $user['nickname'];
  $data['user_img'] = $user['imageurl'];
  $data['content'] = $content;
  $data['images'] = $images;
  $data['create_time'] = time();
 
  if ($this->add($data) === false) {
   throw new \Exception('OPERATION_FAILED');
  }
 }

保存好了之后，接下来如何在前端中显示图片呢？关键在于保存图片数组到数据库里，如何让它取出来的时候转为数组。代码如下：
控制层：


public function my_moments()
 {
  try{
   $data = D(self::$MOMENTS_MODEL)->my_moments();
   $ajaxReturnData['status'] = 1;
   $ajaxReturnData['message'] = 'success';
   $ajaxReturnData['data'] = $data;
  }catch (\Exception $e){
   $ajaxReturnData['status'] = 0;
   $ajaxReturnData['message'] = 'fail';
  }
  $this->ajaxReturn($ajaxReturnData);
 }

模型层：（这里使用了json_decode($array,true)方法，打印出来就是数组了）


public function my_moments()
 {
  extract(generateRequestParamVars());
  $user = D(self::$WECHAT_USER)->find($user_id);
  if($user['is_doctor'] == 1){
   $conditions = [];
   $conditions['user_id'] = $user_id;
   $doctor = D(self::$DOCTOR_MODEL)->where($conditions)->find();
   $identity = $doctor['hospital']. "" . $doctor['grade'];
  }else{
   $identity = '';
  }
  $conditions = [];
  $conditions['user_id'] = $user_id;
  $moments = $this->where($conditions)->order('create_time desc')->select();
  for($i = 0 ; $i < count($moments) ; $i ++){
   $moments[$i]['images'] = json_decode($moments[$i]['images'],true);
  }
  $data = [];
  $data[0] = $user;
  $data[1] = $moments;
  $data[2] = $identity;
  return $data;
 }

最后，动态页面如何显示图片呢？
主要我还在做九宫格图片的适配，就不贴代码了，主要是图片src需要加前缀，也就是你的域名。这样就能显示出来啦~


<image class="moment_img" src="http://wechat.homedoctor.com{{image}}"></image>

不相信你能看到最后，哈哈~我写的太多了
总结
以上所述是小编给大家介绍的微信小程序仿朋友圈发布动态界面，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
            
            

