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Articles by Mayank Agarwal
Page 23 of 31
AngularJS – ngSelected Directive
The ngSelected Directive in AngularJS sets the selected attribute element on the element to True. We can also write an expression inside the ngSelected with the only condition that it should evaluate to True.This special directive is necessary since interpolation cannot be used inside the selected attribute.Syntax..content..Example − ngSelected DirectiveCreate a file "ngSelected.html" in your Angular project directory and copy-paste the following code snippet. ngSelected Directive Welcome to Tutorials Point ...
Read MoreAngularJS – ng-switch Directive
The ngSwitch directive in AngularJS conditionally swaps the DOM structure on the template based upon the scope expression. This directive can be used for showing or hiding elements based upon the switch cases.The HTML elements will be displayed only if the expression inside the ngSwitch directive evaluates to True, else it will remain hidden. This directive is supported by all the HTML elements.Syntax Contents... Contents... Contents... Example − ngSwitch DirectiveCreate a file "ngSwitch.html" in your Angular project directory and copy-paste the following code snippet. ...
Read MoreAngularJS – isObject() method
The isObject() method in AngularJS basically checks if a reference is an Object or not. This method will return True if the reference passed inside the function is an Object, else it will return False.Note − NULL values are not considered as an Object, but JavaScript arrays are objects.Syntaxangular.isObject(value)Example − Check if the reference is an Object or notCreate a file "isObject.html" in your Angular project directory and copy-paste the following code snippet. angular.isObject() ...
Read MoreAngularJS – isString() method
The isString() method in AngularJS basically checks if a reference is a string value or not. This method will return True if the reference passed inside the function is a string, else it will return False.Syntaxangular.isString(value)Example − Check if the reference is a String or notCreate a file "isString.html" in your Angular project directory and copy-paste the following code snippet. angular.isString() Welcome to Tutorials Point ...
Read MoreAngularJS – ng-change Directive
The ng-change directive in AngularJS evaluates a given expression whenever the user changes the input. On every change, the ngChange directive is fired and the expression is evaluated immediately. The JavaScript onChange event only triggers at the end of a change (when the user leaves the form element or presses the key).Note − This directive also requires ngModel to be present.Syntax..Content..Example − ngChange DirectiveCreate a file "ngChange.html" in your Angular project directory and copy-paste the following code snippet. ngChange Directive ...
Read MoreAngularJS – ng-keydown Directive
The ng-keydown directive in AngularJS basically specifies a custom event on pressing the key. We can perform multiple functions whenever the keydown event is called. This event also supports different types of elements like , and .Syntax..content..Example − ngKeydown DirectiveCreate a file "ngKeydown.html" in your Angular project directory and copy-paste the following code snippet. ngKeydown Directive .keyDown { background-color: blue; color: white; ...
Read MoreAngularJS – ng-blur Directive
The ng-blur Directive in AngularJS is fired when an element loses focus from that element. The blur event is executed synchronously along with the DOM manipulations (like removing from the focus point).AngularJS also executes the expression using scope.$evalAsync if the event is fired during an $apply to ensure the consistent application state.Syntax..Content..Example 1 − ng-blur DirectiveCreate a file "ngBlur.html" in your Angular project directory and copy-paste the following code snippet. ngBlur Directive Welcome to Tutorials Point ...
Read MoreHow to convert a string into uppercase in AngularJS?
Sometimes we may need to represent a name or a string in capital letters. To convert a string into uppercase in AngularJS, we can use the uppercase filter to change its case to uppercase.SyntaxIn HTML Template Binding{{uppercase_expression | uppercase}}In JavaScript$filter('uppercase')()Example − Conversion to Upper CaseCreate a file "uppercase.html" in your Angular project directory and copy-paste the following code snippet. uppercase Filter Welcome to Tutorials Point AngularJS | UpperCase Filter ...
Read MoreAngularJS – angular.isArray() Function
The angular.isArray() function in AngularJS basically checks if a reference is an Array or not. This method will return True if the reference passed inside the function is an Array type, else it will return False.Syntaxangular.isArray(value)Example − Check if the reference is an Array or notCreate a file "isArray.html" in your Angular project directory and copy-paste the following code snippet. angular.isArray() Welcome to Tutorials Point AngularJS | angular.isArray() ...
Read MoreUsing next() function in Express.js
Express.js is a powerful tool for building web servers to hit API at backend. It has several advantages which makes it popular, however it has got some drawbacks too, for example, one needs to define different routes or middleware to handle different incoming requests from the client.In this article, we will see how to use the next() function in a middleware of Express.js. There are lots of middleware in Express.js. We will use the app.use() middleware to define the handler of the particular request made by client.Syntaxapp.use(path, (req, res, next) )Parameterspath – This is the path for which the middleware ...
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