小编ver*_*n 2的帖子

我做的socket.io实现是错误的.我正在尝试对mysql数据实现长轮询.

对于此演示,我将为连接到我创建的长轮询服务器的每个用户提取用户数据.每个用户将其唯一的user_id传递给服务器以获取与他/她相关的数据.(在真实应用中,我想获取用户通知)

用户连接到服务器,服务器也从数据库进行长轮询.但问题是,即使我从客户端传递了唯一的ID,同样的数据也被推回到客户端.

用户1通过了id 5,用户2通过了id 3.这两个用户获得的数据与响应相同(用户1的数据)

这是客户端代码:

var user_id = 5; //hardcoded for now, but in real its fetched from a form
var params = {
    userId: user_id,
};
// create a new websocket
var socket = io.connect('http://localhost:8000', { query: params });

// on message received we print all the data inside the #container div
socket.on('notification', function (data) {
    console.log(data);

});

这是服务器端代码:

var app = require('http').createServer(handler),
    io = require('socket.io').listen(app),
    fs = require('fs'),
    mysql = require('mysql'),
    connectionsArray = [], …

我对角度/离子应用程序开发很新.我在某处读了以下内容

接口仅在编译时.这样只允许您检查收到的预期数据是否遵循特定结构.

我正在创建一个离子应用程序,API服务会将一些数据返回给用户.假设它是一个登录函数,API服务返回该数据.

我在Ionic中创建了一个提供程序,使用HTTPClient从API调用API.

//Provider

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';

interface LoginResponse {
  success: boolean;
  message: string;
  token: string;
  userId: number;
}
@Injectable()
export class LoginServicesProvider {
  constructor(public http: HttpClient) {
  }

  login(reqData): Observable<LoginResponse[]> {
    return this.http.post<LoginResponse[]>('localhost:3000/api/login', reqData);
  }
}

如您所见,我创建了一个名为LoginResponse的接口

Login组件的代码如下:

//Component

import { LoginServicesProvider } from './../../providers/login-services/login-services';
import { Component } from '@angular/core';
import { Observable } from 'rxjs/Observable';

@Component({
  selector: 'page-login-page',
  templateUrl: 'login-page.html',
}) …

I know this question has been answered many times. I tried a few of the solutions from here but nothing worked. I'm not using any PHP framework.

I have an insert operation taking place and I want to get the id of the inserted row.

Here's my code:

$qry="INSERT INTO tablename(content) VALUES('".$content."')";
setData($qry);

setData() is a user defined function which does insert operation.

//for data submit
function setData($qry)
{
    $obj=new DBCon();
    $res=$obj->submitQuery($qry);
    return $res;
}

//fetches result
function getData($qry)
{ …

我正在尝试使用 jQuery 验证器插件对文件输入类型进行验证。文件输入类型应仅接受具有 .jpeg、.jpg 和 .png 扩展名的图像，文件大小不应大于 1MB。其他输入字段的验证工作没有任何问题。所需的验证适用于文件输入类型。

可能是什么问题？

Javascript

jQuery.validator.addMethod('filesize', function(value, element, param) {
   return this.optional(element) || (element.files[0].size <= param) 
});    

$('#form').validate({
        rules: {
            firstname: {
                minlength: 6,
                required: true
            },
            lastname: {
                minlength: 6,
                required: true
            },
            file: {
                required: true, 
                accept: "png|jpeg|jpg",
                filesize: 1048576 
            }
        },
        messages: 
           { 
            file: "File must be JPEG or PNG, less than 1MB" 
           },
        highlight: function(element) {
            $(element).closest('.form-group').addClass('has-error');
        },
        unhighlight: function(element) {
            $(element).closest('.form-group').removeClass('has-error');
        },
        errorElement: 'span',
        errorClass: 'help-block',
        errorPlacement: function(error, element) { …

我有一个像这样的JSON对象:

var post = {
    "post_id": "1",
    "content": "content",
    "post_author": {
        "id": "12",
        "firstName": "Amelia",
        "lastName": "Earheart",
    },
    "isLiked": false,
    "likes_count": 0,
    "likers": [],
    "comments_count": 0,
    "commenters": [],
    "comments": []
};

并post从前端传递给下面给出的函数.

var vm = this;
vm.likePost = function(post) {
    var likedPost = post;
    vm.userInfo();
    likedPost.likers.push(userObject); //Here

    myService.postLike(likedPost).success(function(data) {
        likedPost.isLiked = true;
        likedPost.likes_count++;
        vm.posts = data;
    });
};

但这样做,我得到一个JavaScript错误说push is not a function在行likedPost.likers.push(userObject);

并userObject返回vm.userInfo(),它看起来像这样:

vm.userInfo = function() {
    myService.getBasicUserInfo().success(function(data) {
        vm.currentPost.post_author.id …

我有如下所示的对象数组

  readonly allItems = [
    {
      id: 0,
      title: "Item 0",
      belongsTo: 'admin'
    },
    {
      id: 1,
      title: "Item 1",
      belongsTo: 'user'
    },
    {
      id: 2,
      title: "Item 2",
      belongsTo: 'all'
    },
    {
      id: 3,
      title: "Item 3",
      belongsTo: 'user'
    },
    {
      id: 4,
      title: "Item 4",
      belongsTo: 'all'
    }
  ];

我有一个像下面给出的数字数组

let selItems = [0,2,4];

我想要做的是allItems基于selItems数组过滤数组。为此，我编写了以下代码，这显然是错误的。

  for(let i=0; i< this.allItems.length; i++){
      if(selItems.includes(this.allItems[i].id)){
        tempMenu.push(this.allItems[i]);
      }
      console.log(tempMenu);
    }

我得到以下输出

[{
      id: 0,
      title: "Item 0",
      belongsTo: 'admin' …