Develop a customizable template with interactive content using Angular's binding capabilities

After reading a helpful article here, I decided to create my own directive in AngularJS to dynamically generate templates for windows based on the nature of the data being sent. For example, if the app needs to send text input, the directive will create an input area; if it needs to send a boolean value, it will create a checkbox.
However, after successfully creating the directive, I encountered an issue with binding the contents of the templates to be sent back.
I explored the documentation on directives and found the 'transclude' attribute that seemed like it could help me. Despite trying to implement it in my code below, I have not had success so far:

HTML

<div id="notespace">
    <div id="userContainer" >
        <template-type content="additionalField">
                {{toBind}}
        </template-type>
        <button ng-click="addNote(toBind)">OK</button>
    </div>
</div>

JavaScript file of HTML Controller Page

var noteCtrl = function ($scope) {   
        $scope.additionalField=[{
             template:'text'
             }]

        for(var counter=0;counter<$scope.additionalField.length;counter++){
            var template;
            switch ($scope.additionaField[counter].template) {
                case 'text':
                    template = 'inputNote';
                    break;
                case 'otherTypeOfText':
                    template = 'areaNote';
                    break;
                case 'number':
                    template = 'inputNote';
                    break;                   
                case 'bool':
                    template = 'checkNote';
                    break;
                case 'file':
                    template = 'fileNote';
                    break;
            }
        }
    })
$scope.addNote=function(a) {
    alert(a);
}

JavaScript file for the Directive

templateApp.directive('templateType',function($compile){
    var inputNote='<div><input type="text"/></div>';
    var areaNote='<div><textarea ></textarea></div>';
    var checkNote='<div><input type="checkbox" /></div>';
    var fileNote='<div >file</div>';

    var getTemplate=function(type){
        var template='';
        switch (type) {
            case 'inputNote':
                template = inputNote;
                break;
            case 'areaNote':
                template = areaNote;
                break;
            case 'checkNote':
                template = checkNote;
                break;
            case 'fileNote':
                template = fileNote;
                break;
        }
        return template;
    };
    var linker=function(scope,element,attrs){

        element.html(getTemplate(scope.content.template));
        $compile(element.contents())(scope);
    };
    return{
        restrict:"E",
        replace:true,
        transclude:true,
        link:linker,
        scope:{
            content:'='
        }
    };
});

The main issue lies in the fact that the alert from the addNote function does not display anything or shows 'undefined', rather than displaying the content of the template like the inputArea does.

Answer №1

To display the value sent inside a directive, simply include the ng-transclude directive in the element where you want to replicate the interpolated value of the expression toBind.

app.directive('foobar', [function() {
    return {
        restrict: 'E',
        transclude: true,
        replace: true,
        template: '<div ng-transclude></div>',
        link: ...
    }
}])

Usage:

<foobar>{{someValueFromScope}}</foobar>

Result:

<div>someValueFromScope</div>

UPDATE:

If you're facing an issue, you can try this approach:

<template-type content="additionalField" option="toBind"></template-type>

In the directive:

var inputNote='<div><input type="text" ng-model="option"/></div>';

scope: {
    content: '=',
    option: '@'
}

Now any changes in the input content will be reflected in the option variable.

UPDATE 2:

I have created a functional demo here: jsfiddle

I have also rectified the code in the previous update.

UPDATE 3: When updating the options value, the directive sends out an event optionsValueChanged to its parent scope (which is typically the controller's scope). The scope responds by modifying the value of data.anotherValue. However, for managing shared values across multiple components, it's recommended to use a provider (value or service). This is more suitable for scenarios where a value is needed in multiple places and avoids unnecessary complexity.

Answer №2

When working with HTML, it is important to include a controller in the following manner:

<div id="notespace" ng-controller="noteCtrl">
    <div id="userContainer" >
        <template-type content="additionalField">
                {{toBind}}
        </template-type>
        <button ng-click="addNote(toBind)">CONFIRM</button>
    </div>
</div>

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