Let's say we have a form like the one below. We want to send the data to our webserver via AJAX and from there to a script running on an external server.
So we have normal inputs, a multi-select field and a file dropzone where we can upload multiple files.
Assuming the AJAX POST request was succ...
Introduction
NMAKE is a command-line utility developed by Microsoft to be used primarily in conjunction with Microsoft Visual Studio and/or the Visual C++ command line tools.
NMAKE is build system that falls under the Make family of build systems, but has certain distinct features that diverge fro...
Introduction
The Autotools are a group of programs that create a GNU Build System for a given software package. It is a suite of tools that work together to produce various build resources, such as a Makefile (to be used with GNU Make). Thus, Autotools can be considered a de facto build system gene...
Session storage service :
Common factory service that will save and return the saved session data based on the key.
'use strict';
/**
* @ngdoc factory
* @name app.factory:storageService
* @description This function will communicate with HTML5 sessionStorage via Factory Service.
*/
a...
Maybe
Maybe is an applicative functor containing a possibly-absent value.
instance Applicative Maybe where
pure = Just
Just f <*> Just x = Just $ f x
_ <*> _ = Nothing
pure lifts the given value into Maybe by applying Just to it. The (<*>) function applies...
The first to thing to have: a model that contains a has_many relation with another model.
class Project < ApplicationRecord
has_many :todos
end
class Todo < ApplicationRecord
belongs_to :project
end
In ProjectsController:
class ProjectsController < ApplicationController
d...
It is a bad practice to block on async calls as it can cause deadlocks in environments that have a synchronization context. The best practice is to use async/await "all the way down." For example, the following Windows Forms code causes a deadlock:
private async Task<bool> TryThis()...
//Using File.WriteAllBytes
using (ExcelPackage excelPackage = new ExcelPackage())
{
//create a new Worksheet
ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");
//add some text to cell A1
worksheet.Cells["A1"].Value = "My fourt...
Ifconfig
List all the interfaces available on the machine
$ ifconfig -a
List the details of a specific interface
Syntax: $ ifconfig <interface>
Example:
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:x.x.x.x Bcast:x.x.x.x Mask:x.x.x.x
...
File: /etc/hosts contains a list of hosts that are to be resolved locally(not by DNS)
Sample contents of the file:
127.0.0.1 your-node-name.your-domain.com localhost.localdomain localhost
XXX.XXX.XXX.XXX node-name
The file format for the hosts file is specified by RFC 952
File: /etc/resolv.conf contains a list of DNS servers for domain name resolution
Sample contents of the file:
nameserver 8.8.8.8 # IP address of the primary name server
nameserver 8.8.4.4 # IP address of the secondary name server
In case internal DNS server you can validate if this server reso...
IMPORTANT This is just an example code, do not use in production.
In order to download an header chain we have to send a getHeaders message.
In this example we will require as much as possible headers after the 40000th one.The peer will respond with batch of 2000 headers so, we have to take the la...
This should always be your initial fix. A good policy is to decompile the database before each release.
Create a decompile shortcut. This loads the database with a "/decompile" switch.
Right Click your Database File. Select Copy
Right Click in the explorer window and select "...
If you have images or other data stored in Access itself as OLE Objects, then you should find a better approach. When the OLE data is stored, it is stored according to the software (and version of software) on the computer storing it. When another computer goes to display that OLE Object data on the...
This is a lot of work, so do this as a last resort after exhausting all other options. You only need to do this if the problem is occurring for different users, on different machines. If it isn't occurring for all users, then most likely it is not a corrupt database container.
Similar to the steps...
When you develop a C++ program, the next step is to compile the program before running it. The compilation is the process which converts the program written in human readable language like C, C++ etc into a machine code, directly understood by the Central Processing Unit. For example, if you have a...
Manipulate the IP routing table using route
Display routing table
$ route # Displays list or routes and also resolves host names
$ route -n # Displays list of routes without resolving host names for faster results
Add/Delete route
OptionDescriptionadd or delAdd or delete a route-host x.x.x.xA...
