Angularjs Tricks

We define a directive that will automatically slash the input field as user typein the date. The directive have following capabiltiy: The directive will append slash '/' when input field has 2 or 5 characters. The input will accept only 10 characters (dd/mm/yyyy). Validity of date provide will not be checked. When the backspace is pressed it will remove the last two character if last character is slash. Otherwise it will remove last character from the input field. The input will not accept characters other than numbers (0 to 9). Let's jump into the code. We will use bootstrap for awesome look: HTML Code: <div class="container" ng-app="myApp" ng-controller="myAppCtrl"> <div class="row"> <div class="col-sm-8 col-sm-offset-2"> <form class="form-horizontal"> <h4 class="bg-primary">Auto Slashing Date using Angularjs Directive</h4> <div class=...

Let me ask you one question. Can a veiwValue and modelValue have same value into a different format? The answer is YES . Here we will see how it can be possible. We will see it through a simple example that converts date string (viewValue) into timestamp (modelValue). We will use a text box to enter a date string (dd/mm/yyyy) and convert it into timestamp that will be stored into model value. The trick is that we will use $parsers to convert the date string into the timestamp and $formatters to change the timestamp stored in modelValue to date string that will be shown on text input. Let's see the codes first: HTML Code: <h4>Date to Timestamp</h4> <div class="form-group"> <label for="date1" class="col-sm-3 control-label">Date1 VeiwValue:</label> <div class="col-sm-3"> <input type="text" id="date1" class="form-control" name="date1" ng-model="ob...

$parsers and $formatters are array of function defined on ngModelController . When there is change in values (view or model), the value is passed through the $parsers or $formatters pipeline to convert it according to the needs. $parsers (View to Model): $parsers is an array of function which executes when there is change in view  value ( $veiwValue ), usually via user input. $parsers cause the conversion of view value into the form desirable to assign in model value. The value is passed through each $parsers function and the return value of one function is passed to next function. Last return value is passed to $validators and after validation the value is assigned to model. These $parsers functions are called array order (i.e. index 0 to n). $parsers are not called when there is change in model value programmatically. $parsers function must return some value. If it not, causes parse error and model value is set to undefined . Let's see the simple ...

While creating a UI for the web apps, we come up with the situation where we want to get the same type of information from the user. In some situation, we have no idea about the number of that particular type of information the user wanted to provide. In this situation, we come with the solution to dynamically add the field or group of fields based on the user interaction with the form element. For e.g.: user's phone number- User will decide the number of phones it wishes to enter into the form. The idea is simple. We will provide the user a way to add the number of fields it requires. There is also a possibility when the user wishes to remove the previously added fields. To implement the dynamic fields addition, we will use ng-repeat directive to render the fields or group of fields. This ng-repeat directive is to be defined on the div element which wraps the markup for the fields which is to be dynamically added. Let jumps into the code. For the awesome look we will use ...

While creating an angular form, we come upon a situation where we required to generate the sequence of years in the select HTML tag. There is some way to perform this task, but each has its limitation. Let's look the way to generate the years : Hard code an array having years in your controller and assign it to some $scope variable. Use for loop to generate the years and then assign to $scope variable. Send $http request to generate the array of year and assign the response data to $scope variable. Define a filter that will be used to generate the sequence of years. As the first and second method makes our controller dirty and the third method causes HTTP request that will overhead server, so we are going to see the fourth method to generate the years as it has several advantages over other three methods. So let's jump into the code: HTML Code: <form name="myform"> <select ng-options="year for year in [] | range: '2000':'20...

ngIf and ngShow directives are used very frequently in Angular apps. Here will the difference between these two through an example. Firstly, let's see the main difference between these two as in angular docs: ngIf differs from ngShow and ngHide in that ngIf completely removes and recreates the element in the DOM rather then changing its visibility via display css property. The main points are as follows: ngShow directive uses css display property to show and hide the element in DOM. It does't remove the element from the DOM. It just set class="ng-hide" to hide the element and removes the ng-hide class to show the element. ngIf directive remove and reinsert the element based on the expression provided in ng-if directive. The inserted element has the state which was initialized at the time of compilation. If we change any css property of the element or set any class, that css property and class will be lost if the ng-if expression becomes false and...

In the previous post , we have seen how the datatype mismatch cause an error in HTML5 Angularjs Form. We have see the remedy to remove those errors. Each time when we send and $http request to insert and item to MySQL database we have to convert the data according to the data format accepted by the database. If in our form has less number of input fields then we can change the data format of form data submit to server by converting each value. It is tedious to convert the data format for each input field if we have many input to handle. In that situation, we will make our code dirty and less maintainable and readable. To overcome all these type of difficulties, we have created an angular service to tackle it. Let's see the code for our angular service named $convertor: $convertor Service: var app = angular.module('myApp',[]); app.factory('$convertor',['dateFilter',function(dateFilter){ return{ convertForSQL : convertForSQL, convertForHTML5 : c...

Angularjs provide an directive for the Date and Number input elements. We may be in a problem while handling the form having these as input from the user. There is always a type miss match between the value provided or accepted by these input and and the value accepted by the MySQL database. In Angular, we send and receive data in a JSON format to prevent the page reload. JSON are provided into a string form, we need to process the JSON string at client side. Date , Integer and Float values are provided into string format so, we need to process the these values. To show how to tackle this type mismatch, I have created an simple app that take one text, one float, one integer and one date value from the user and send it to server for storing into the database and return the inserted data item back to the user into JSON format. Before going into the app, it should be noted that. HTML5 date input takes and provide Date object HTML5 number input takes number ...

Angular $http service is used to send asynchronous http request to the server. To learn how to use $http service with php, we will create a simple app using form directive. This app will take two numbers and send the these number to php server for their sum. Here we will use php code to process the data and return the sum. Let's jump into the app. Here is front end HTML code for our app. We are using twitter bootstrap to for awesome look of our app: Way 1: HTML Code: <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>Find Sum</title> <link rel="stylesheet" href="css/bootstrap.min.css"> </head> <body ng-app="myApp"> <div class="container" ng-controller="myAppCtrl"> <div class="row"...