Retrieving form elements in Angular

Question

Retrieving form elements in Angular

I need to extract the element name and class from a form passed to a function. Is there a way to accomplish this?

On the HTML side:

   <form name="test">
    <div>
         <input type="text" class="test1" name="test2"/>
    </div>
    <div>
         <input type="text" class="test3" name="test4"/>
    </div>
    </form>
    <div>
         <input type="button" data-ng-click="save(test)" />
    </div>

And on the Javascript side:

$scope.save = function(form){
   for(each element in the form)
       (extract values of elements)
}

Is it possible to achieve this? My goal is to modify classes and attributes as needed.

javascript angularjs

Answer 1

Answer №1

If you need to access the form directly from $scope by using its name, such as $scope.exampleForm, and then access the elements within the form, like $scope.exampleForm.input1.

However, if you prefer to iterate through the elements without knowing their specific names, you can use a loop similar to this:

angular.forEach($scope.exampleForm, function (element, name) {
    if (!name.startsWith('$')) {
        // This element belongs to the form!
    }
});

Answer 2

If you need to access the form directly from $scope by using its name, such as $scope.exampleForm, and then access the elements within the form, like $scope.exampleForm.input1.

However, if you prefer to iterate through the elements without knowing their specific names, you can use a loop similar to this:

angular.forEach($scope.exampleForm, function (element, name) {
    if (!name.startsWith('$')) {
        // This element belongs to the form!
    }
});

Answer 3

Answer №2

Although I am fairly new to AngularJS, I am eager to provide an answer to put my knowledge to the test and assist you in any way possible.

When creating a form in AngularJS, it is essential to use ng-model on each element. For instance, consider a form designed to collect a user's first and last name:

 <form name="userForm">
<div>
     <input type="text" class="firstName" name="userFirstName" data-ng-model="user.firstName"/>
</div>
<div>
     <input type="text" class="lastName" name="userLastName" data-ng-model="user.lastName"/>
</div>
</form>
<div>
     <input type="button" data-ng-click="saveUser(userForm)"/>
</div>

This setup enables access to the form data using $scope.user.

Regarding changing classes and attributes, utilizing the ng-dirty class can serve as a marker to detect when a user initiates a change. To provide more tailored guidance, it would be beneficial to understand your specific objectives for altering classes and attributes within the form.

Answer 4

Although I am fairly new to AngularJS, I am eager to provide an answer to put my knowledge to the test and assist you in any way possible.

When creating a form in AngularJS, it is essential to use ng-model on each element. For instance, consider a form designed to collect a user's first and last name:

 <form name="userForm">
<div>
     <input type="text" class="firstName" name="userFirstName" data-ng-model="user.firstName"/>
</div>
<div>
     <input type="text" class="lastName" name="userLastName" data-ng-model="user.lastName"/>
</div>
</form>
<div>
     <input type="button" data-ng-click="saveUser(userForm)"/>
</div>

This setup enables access to the form data using $scope.user.

Regarding changing classes and attributes, utilizing the ng-dirty class can serve as a marker to detect when a user initiates a change. To provide more tailored guidance, it would be beneficial to understand your specific objectives for altering classes and attributes within the form.

Answer 5

Answer №3

One common suggestion I've come across regarding angular.js is to limit DOM manipulation to directives. It's recommended to follow Anthony's advice and utilize ng-model for this purpose.

Scroll down below to discover a more appropriate way of implementing this using directives.

However, if you still prefer to handle it in the controller, here's a jsfiddle showcasing an approach:

http://jsfiddle.net/3BBbc/2/

HTML:

<body ng-app="myApp">
    <div ng-controller="MyCtrl">
        <form id="test">
            <div>
                <input type="text" class="test1" name="test2" />
            </div>
            <div>
                <input type="text" class="test3" name="test4" />
            </div>
        </form>
        <div>
           <input type="button" ng-click="save('test')" value="submit" />
        </div>
    </div>
</body>

JavaScript:

var myApp = angular.module('myApp', []);

function MyCtrl($scope) {
    $scope.save = function (formId) {
        $('#' + formId).find('input').each(function (idx, input) {
            // Implement your DOM manipulation here
            console.log($(input).val());
        });
    };
}

Additionally, here is another jsfiddle demonstrating how to achieve this with directives, although it may be slightly more complex:

http://jsfiddle.net/3BBbc/5/

Answer 6

One common suggestion I've come across regarding angular.js is to limit DOM manipulation to directives. It's recommended to follow Anthony's advice and utilize ng-model for this purpose.

Scroll down below to discover a more appropriate way of implementing this using directives.

However, if you still prefer to handle it in the controller, here's a jsfiddle showcasing an approach:

http://jsfiddle.net/3BBbc/2/

HTML:

<body ng-app="myApp">
    <div ng-controller="MyCtrl">
        <form id="test">
            <div>
                <input type="text" class="test1" name="test2" />
            </div>
            <div>
                <input type="text" class="test3" name="test4" />
            </div>
        </form>
        <div>
           <input type="button" ng-click="save('test')" value="submit" />
        </div>
    </div>
</body>

JavaScript:

var myApp = angular.module('myApp', []);

function MyCtrl($scope) {
    $scope.save = function (formId) {
        $('#' + formId).find('input').each(function (idx, input) {
            // Implement your DOM manipulation here
            console.log($(input).val());
        });
    };
}

Additionally, here is another jsfiddle demonstrating how to achieve this with directives, although it may be slightly more complex:

http://jsfiddle.net/3BBbc/5/

Answer 7

Answer №4

I need help retrieving the name and class of an element from a form that is passed to a function. How can I accomplish this?

It looks like your pseudocode is heading in the right direction:

$scope.save = function( formName ) {
    angular.forEach( $scope[ formName ], function( field, fieldName ) {

        // Exclude Angular properties; we only want form fields
        if( fieldName[ 0 ] === '$' ) {
            return;
        }

        // "fieldName" contains the name of the field

        // Retrieve the value
        var fieldValue = field.$viewValue;
    } );
}

My main goal is to modify the class and other attributes as needed.

You can achieve this by accessing the field elements using the Angular element wrapper:

// Get the field element using Angular element
var fieldElement = angular.element( document.querySelector( '[name="' + fieldName + '"]' ) );

You can then utilize different jqLite methods on these elements. For example, to change the element's class (replacing the existing class), you can use the attr method:

// Replace current class with "new-class"
fieldElement.attr( 'class', 'new-class' );

Answer 8

I need help retrieving the name and class of an element from a form that is passed to a function. How can I accomplish this?

It looks like your pseudocode is heading in the right direction:

$scope.save = function( formName ) {
    angular.forEach( $scope[ formName ], function( field, fieldName ) {

        // Exclude Angular properties; we only want form fields
        if( fieldName[ 0 ] === '$' ) {
            return;
        }

        // "fieldName" contains the name of the field

        // Retrieve the value
        var fieldValue = field.$viewValue;
    } );
}

My main goal is to modify the class and other attributes as needed.

You can achieve this by accessing the field elements using the Angular element wrapper:

// Get the field element using Angular element
var fieldElement = angular.element( document.querySelector( '[name="' + fieldName + '"]' ) );

You can then utilize different jqLite methods on these elements. For example, to change the element's class (replacing the existing class), you can use the attr method:

// Replace current class with "new-class"
fieldElement.attr( 'class', 'new-class' );

Retrieving form elements in Angular

Answer №1

Answer №2

Answer №3

Answer №4

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