Words Reserved in Javascript

In Javascript few words cannot be used as variables, methods, functions or any kind of object names, below given is the list of all the reserved words.

abstract else instanceof switch
boolean enum int synchronized
break export interface this
byte extends long throw
case false native throws
catch final new transient
char finally null true
class float package try
const for private typeof
continue function protected var
debugger goto public void
default if return volatile
delete implements short while
do import static with
double in super

React JS setup using ES6 with .tsx files in Visual Studio

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When i’m a beginner to React i’ve faced many issues in making setup with Visual Studio. As i’ve found that there are many ways to write React code.

  • Can be written in Js  files using ES5
  • Can be written in JSX files using ES5
  • Can be written in TSX files using ES6

tsx –> ts (typescript) + jsx ( javascript and xml)

Where most of the tutorials were providing setups with JSX/JS using ES5.  Now i’ll show you how to setup in your local environment Visual Studio using ES6 with TSX (typescript syntax).

Step 1: Install Npm

  • To install the React Js we need Node Js environment setup.
  • js development environment can be setup in Windows, Mac, Linux and Solaris. The following tools/SDK are required for developing a Node.js application on any platform
    • js
    • Node Package Manager (NPM)
  • NPM (Node Package Manager) is included in Node.js installation since Node version 0.6.0., so there is no need to install it separately.
  • To Install Node visit Node.js official web site https://nodejs.org. It will automatically detect OS and display download link as per your Operating System.Click on Download and install the latest version.
  • Once you install Node.js on your computer, you can verify it by opening the command prompt and typing node –version. If Node.js is installed successfully then it will display the version of the Node.js installed on your machine, as shown below.

Step 2: Create ASP.Net Web Application

  • Open Visual Studio FileNewProject
  • Select->”Web Template”->select the ASP.Net Web Application->Click OK
  • In the “New ASP.NET MVC Project” dialog, Select the MVC Template->Click OK
  • Goto->Tools-> Options –> Projects and Solutions –> Select External Web Tools->Move $(PATH) to above the $(DevEnvDir)->Click Ok

Step 3: Create package.json file and install the required packages using npm commands. Open Command prompt and Goto your project directory and run command

 

2. Now provide a name using lower case. And you can just click enter and say Yes.

  •  Install webpack

  • Install webpack-dev-server

  • Install react and react-dom. React and ReactDOM are generally used together. ReactDOM is a package for working with the DOM

  • Now we need typescript and ts-loader to load and build .tsx files

File: package.json

 

Step 4:  Download React Quick Start files 

Go to the following link and download React Quick Start files

Step 5: Copy required folder into your ASP.Net Web Application

  • Copy dist, typings and src folders  from quick start files and paste them in the project.
  • dist —> This folder has bundle.js which will be always update by using Web Pack Task Runner.
  • typings –> This is used to provide typescript intellisence to .tsx files
  • src –> This is the folder where we create .tsx files and do some coding part.
  • When we do any changes in .tsx files make sure that you run the Web Pack Task Runner. Unless the changes will not get updated in bundle.js.

Step 6: Copy webpack.config.js in the project directory.

  • In order to use external modules webpack.config.js must be included with resolve:{extensions: [‘.ts’, ‘.tsx’, ‘.js’, ‘.json’]}.
  • entry –> You can setup startup file here.
  • output: To direct the changes in .tsx to bundle.js.
  • module: Setting up the loaders that are used. Here we are using ts-loader. 

File: webpack.config.js

 

Step 7:  Copy tsconfig.json and typings.json files from quick start and paste them in the project.

Step 8: Install WebPack Task Runner .

  • Now right click webpack.config.js –> open Task Runner Explorer
  • Click on Run-Development / Watch-Development.
  • If any error in the we can l0ok at the error from Run-Development / Watch-Development.

Step 9: Add div tag in the index.cshtml with an id attribute. Refer that id in src –> index.tsx.

File: Views –> Home –> index.cshtml 

File: src/index.tsx

Output: 

How to Export Html Table to Excel with CSS

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To export your table data (or) a list into excel workbook, there are several options to export like, we can use Microsoft.Office.Interop library or something else. But in this tutorial i want to show you the simplest way to export the Html Table to Excel with Inline CSS applied using very few lines of code.

  • Here the Excel creates a file that contains the Html and XML tags which is also called as Html/XML Hybrid. When a WorkBook saved in the following format with Html and XML tags, it can go from Excel to the Browser and back form Browser to Excel again without loosing any information.

Step 1:  Create a simple html code as following. Here we can create ‘N’ number of WorkSheets in a WorkBook.

  • From the above code X:Name  in the X:ExcelWorkSheet is the name of the sheet in the Excel.
  • And we can specify the required options to the WorkSheet with in <x:WorksheetOptions>. Here are the few more <X:WorkSheetOptions>
    •   <x:Selected/>   

    • <x:DoNotDisplayGridlines/>   

    • <x:ProtectContents>False</x:ProtectContents>   

    • <x:ProtectObjects>False</x:ProtectObjects>   

    • <x:ProtectScenarios>False</x:ProtectScenarios>

  • And the If condition <!–[if gte mso 9]> is used to check whether you have Microsoft Office or not. It’s really necessary to check this.

Step 2: Create a Html table with inline Css in the <body>

 

Step 3: Add the following Script in the <head>.

  • function (table, name) { … } is the function which is accepting the two parameters,
    • one is the Id of the table.
    • other is the name of the X:ExcelWorkSheet. 
  • template: It is just a string which is constructed with Html/XML hybrid.
  • base64 = function(s) –> accepting the parameter of the format which is framed by using function format = function (s, c).
  • format = function (s, c) –> accepting two parameters,
    • One is the template with HTMl and XML tags.
    • Other is the ctx object which is framed with two properties { worksheet: ‘ ‘, table:’ ‘}

Step 4: Here is the total HTML page.

Output:

Dynamic Tree Using Angular 2/4

Hello Angular Experts and Beginners, if you really stuck in a situation how to form dynamic tree using  <ul> and <li>. I’m sure that this blog will definitely helps you.

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Step 1: Prequisite you should have a json data in a format as follows.

Step 2: Once you have data create the following structure in your angular project

File: test.json

 

 

Step 3: Creating declaration file for javascript file.

Here we are now creating a declaration file for the javascript file (myscript.js) using Ambients in typescript.

For reference of TypeScript Ambients please follow this post Typescript Ambients

File: myscript.js

File: myscript.d.ts

Step 4: Once declaration file is ready then create component and template and add reference of declaration file in the component

File: app.component.ts

File: template.html

Note: In the below code i’ve created Recursive ng-template. 

  1. #mylst1 is a template reference variable for the ng-template
  2. let-list –> here we are defining a local variable. let is a key word to declare variables in typescript.
  3. ng-container –> It’s a container to group html elements, which is same as ng-include  in AngularJS. For reference please follow the link 
  4. $implicit –> It is used to set the value for our ng-template using context property of ngTemplateOutlet.

File: app.module.ts

File: main.ts

Step 5: Create a html file in src/DynamicTree.html folder

File: DynamicTree.html

Output: