Setting Up Your Development Environment: A Complete Guide
Table of Content:
Development Environment
You can setup your development environment as follows.
- An IDE / text editor - Webstorm, Sublime Text, Visual Studio or even a notepad++
- node - To compile and run angular project into local
install nodenpm install -g http-server
- After installation cd into your project folder
run http-server -o
- A browser. Chrome is preferred
- Git - Version control system.
ng-app and Angular Expression
ng-app and Angular expressions are two important concepts in AngularJS, which are used to create dynamic and interactive web applications.
An example of using the ng-app directive would be as follows:
<span class="pln"> </span><span class="tag"><html</span><span class="pln"> </span><span class="atn">ng-app</span><span class="tag">></span><span class="pln"> </span><span class="tag"><head></span><span class="pln"> </span><span class="tag"><script</span><span class="pln"> </span><span class="atn">src</span><span class="pun">=</span><span class="atv">"https://ajax.googleapis.com/ajax/libs/angularjs/1.7.9/angular.min.js"</span><span class="tag">></script></span><span class="pln"> </span><span class="tag"></head></span><span class="pln"> </span><span class="tag"><body></span><span class="pln"> </span><span class="tag"><div></span><span class="pln"> </span><span class="tag"><label></span><span class="pln">Name:</span><span class="tag"></label></span><span class="pln"> </span><span class="tag"><input</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"text"</span><span class="pln"> </span><span class="atn">ng-model</span><span class="pun">=</span><span class="atv">"yourName"</span><span class="pln"> </span><span class="atn">placeholder</span><span class="pun">=</span><span class="atv">"Enter a name here"</span><span class="tag">></span><span class="pln"> </span><span class="tag"><hr></span><span class="pln"> </span><span class="tag"><h1></span><span class="pln">Hello {{yourName}}!</span><span class="tag"></h1></span><span class="pln"> </span><span class="tag"></div></span><span class="pln"> </span><span class="tag"></body></span><span class="pln"> </span><span class="tag"></html></span><span class="pln"> </span>
In this example, the ng-app directive is added to the <html> element, indicating that this is the root element of the AngularJS app. The ng-model directive is then used on an input field to bind the value of the input to a model variable called "yourName." The value of this variable is then displayed in an h1 element using an AngularJS expression ({{yourName}}). This is a simple example of how the ng-app directive and Angular expressions can be used to create dynamic and interactive web pages.
The ng-app directive is used to define the root element of an AngularJS application. It is typically added to the HTML document's body or head element. Once the ng-app directive is added, AngularJS will automatically initialize and start the application.
Angular expression
Angular expressions are similar to JavaScript expressions but with a few differences. They can be used to bind application data to HTML elements and can also be used to evaluate expressions in AngularJS controllers. Angular expressions are enclosed in double curly braces {{}} and can be used to bind data to elements, such as input fields, and to perform simple operations, such as calculations or conditions.
An Angular expression is a JavaScript-like code snippet that is evaluated by AngularJS at runtime. Expressions are typically used to bind data to elements in the view, but can also be used to perform simple calculations and logic.
For example, the following is an Angular expression that binds the value of the "name" property of the $scope object to an input field:
<span class="pln"> </span><span class="tag"><input</span><span class="pln"> </span><span class="atn">type</span><span class="pun">=</span><span class="atv">"text"</span><span class="pln"> </span><span class="atn">ng-model</span><span class="pun">=</span><span class="atv">"name"</span><span class="pln"> </span><span class="tag">/></span>
In this example, the expression "name" is evaluated by AngularJS and the resulting value is displayed in the input field.
Another example of an Angular expression is a simple mathematical calculation, such as:
<span class="pln"> </span><span class="tag"><p></span><span class="pln">{{ 2 + 2 }}</span><span class="tag"></p></span>
In this example, the expression "2 + 2" is evaluated by AngularJS and the resulting value of 4 is displayed in the paragraph element.
You can also use expressions to control the behavior of directives, such as:
<span class="pln"> </span><span class="tag"><div</span><span class="pln"> </span><span class="atn">ng-show</span><span class="pun">=</span><span class="atv">"isVisible"</span><span class="tag">></div></span>
In this example, the expression "isVisible" is evaluated by AngularJS and the resulting value determines if the div is visible or not.
- Question 1: How do you handle events and data binding in AngularJS?
- Question 2: Can you explain how dependency injection works in AngularJS?
- Question 3: How do you implement routing in an AngularJS application?
- Question 4: How do you optimize the performance of an AngularJS application?
- Question 5: Can you explain how to work with forms and validation in AngularJS?
- Question 6: How do you test an AngularJS application?
- Question 7: Can you explain how to use Grunt and Bower in an AngularJS project?