Bidirectional data-binding in AngularJS for submitting form data via POST requests

Incorporating angularjs into my project, I am faced with the challenge of dynamically populating a form and then submitting the data via POST to a server.

Initially, I set up a data variable in my controller for the purpose of later POSTing it:

$scope.data = {};

Subsequently, in my HTML file, I proceeded to generate the form elements using the following code snippet:

<div ng-repeat="(name, attributes) in fields">
        <element myVar="data.{{name}}" name="{{name}}" attributes="{{attributes}}" ></element>
    </div>

The 'fields' variable contains information about how each field should be displayed, as shown below:

{"agency":{"name_displayed":"Agency","size":"30","tag":"input","type":"text"},"department":{"name_displayed":"Department","size":"30","tag":"input","type":"text"},"description":{"cols":"50","name_displayed":"Description","rows":"4","tag":"textarea"}}

However, when implementing the element directive, I encountered several errors. The directive is outlined as follows:

demoApp.directive("element", function() {

        var template = function(name, attributes, results) {
            // Template generation logic
        };

        return {
            restrict: "E",
            scope: {
                myVar: '='
            },
            link: function(scope, element, attrs) {
                // Linking logic
            }
        };
    });

The issue arises from the inclusion of the 'myVar' attribute and scope object within the directive code. Without these components, the form displays correctly. Am I overlooking something concerning two-way data binding? Is there an alternative approach I could take? - Appreciate any guidance.

Answer №1

It is quite unusual to add HTML content without compiling it first. The first thing I would recommend changing is the link function:

....
link: function(scope, element, attrs) {
        var attributes = angular.fromJson(attrs.attributes);
        var tpl = template(attrs.name, attributes, attrs.results);
        var tpl_compiled = angular.element($compile( tpl )(scope));
        element.html(tpl_compiled);
    }
 ...

By doing this, we instruct Angular to perform a digest cycle over the newly appended data. This could explain why the myVar did not fire with an isolate scope.

I hope this information proves helpful!

Answer №2

When crafting your html, ensure that myVar follows the format my-var. Are you certain an isolated scope is necessary for this directive? Check out this plunker link to see Maxim Shoustin's example in action.

View Plunker

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