Utilizing ngModel on input elements inside a custom directive, ensuring compatibility with other ng-* attributes

Question

Utilizing ngModel on input elements inside a custom directive, ensuring compatibility with other ng-* attributes

In my current project, I am working on developing a custom directive that acts as a wrapper around an input field. The main purpose of this directive is to simplify formatting, encapsulate animations, and enhance overall functionality.

One of my goals for this directive is to integrate ngModel so that it can work seamlessly with other Angular directives like ng-maxlength and ng-required, depending on the ng-Model configuration.

To showcase my progress, I have created a Plunkr demo which can be accessed through this link: http://embed.plnkr.co/xV8IRqTmQmKEBhRhCfBQ/

However, I have encountered some issues in my implementation. Specifically, the ng-required directive is functioning correctly but only invalidates the entire form, rather than just the individual element itself (form.element.$invalid remains false). Additionally, the ng-maxlength/ng-minlength directives do not appear to have any effect at all.

If anyone has any insights or suggestions on what might be causing these problems, I would greatly appreciate your help. Thank you in advance for any guidance you can provide :)

javascript angularjs angularjs-directive angular-ngmodel

Answer 1

Answer №1

Hello to all and a big thank you for sharing your answers!

I have finally discovered the missing piece that was eluding me: the name attribute should not be placed on the inner input field, but rather on the outer element containing the ng-model directive along with other directives.

To provide a clearer explanation, previously my template appeared as follows:

<span class="custom-input-element">
 <label for="{{elementId}}-input">{{elementLabel}}<span class="required-marker" ng-if="elementRequired">*</span></label>

  <input id="{{elementId}}-input" type="text" name="{{elementName}}" ng-trim ng-model="value" ng-init="focused = false" ng-focus="focused = true" ng-blur="focused = false"/>
</span>

This setup was utilized in the following manner:

<custom-input id="foldername" name="foldername" label="Folder Name:" 
   ng-model="folder.name" ng-maxlength="15" ng-required="true">   </custom-input>

Note the presence of name={{elementName}}, which essentially duplicated the name="foldername" within my directive's tag.

Upon removing it from the directive's template, the form properly references my directive and its ngModel for validation - keeping the input and inner ng-model hidden. This allows for seamless interaction with other directives such as ng-maxlength, ng-minlength, and custom validators.

Now, not only is the form validated correctly, but each element undergoes the expected validation process.

You can view the updated version on my Plunker where everything now functions as intended: http://embed.plnkr.co/i3SzV8H7tnkUk2K9Pq6m/

Thank you for your time and invaluable insights!

Answer 2

Hello to all and a big thank you for sharing your answers!

I have finally discovered the missing piece that was eluding me: the name attribute should not be placed on the inner input field, but rather on the outer element containing the ng-model directive along with other directives.

To provide a clearer explanation, previously my template appeared as follows:

<span class="custom-input-element">
 <label for="{{elementId}}-input">{{elementLabel}}<span class="required-marker" ng-if="elementRequired">*</span></label>

  <input id="{{elementId}}-input" type="text" name="{{elementName}}" ng-trim ng-model="value" ng-init="focused = false" ng-focus="focused = true" ng-blur="focused = false"/>
</span>

This setup was utilized in the following manner:

<custom-input id="foldername" name="foldername" label="Folder Name:" 
   ng-model="folder.name" ng-maxlength="15" ng-required="true">   </custom-input>

Note the presence of name={{elementName}}, which essentially duplicated the name="foldername" within my directive's tag.

Upon removing it from the directive's template, the form properly references my directive and its ngModel for validation - keeping the input and inner ng-model hidden. This allows for seamless interaction with other directives such as ng-maxlength, ng-minlength, and custom validators.

Now, not only is the form validated correctly, but each element undergoes the expected validation process.

You can view the updated version on my Plunker where everything now functions as intended: http://embed.plnkr.co/i3SzV8H7tnkUk2K9Pq6m/

Thank you for your time and invaluable insights!

Answer 3

Answer №2

I have successfully developed a solution that functions as intended; allow me to share the pertinent section of code with you.

One particularly challenging aspect was reconnecting the input and validation to the parent controller's form.

To accomplish this, I had to incorporate several private AngularJS methods and properties:

 // Code snippet from Angular.js to modify $setValidity of ngModel for accessing the parent form...
  var VALID_CLASS = 'data-ng-valid',
    INVALID_CLASS = 'data-ng-invalid',
    PRISTINE_CLASS = 'data-ng-pristine',
    DIRTY_CLASS = 'data-ng-dirty',
    UNTOUCHED_CLASS = 'data-ng-untouched',
    TOUCHED_CLASS = 'data-ng-touched',
    PENDING_CLASS = 'data-ng-pending';
  
  // Various helper functions and main logic for setting validity

Next, in the link function:

function(scope, element, attrs, ctrl, transclude){
[...]
// Additional implementation details go here

The template variable contains the HTML structure around the input field, including labels, indicators for validity, etc.

EDIT: With my custom directive, I can utilize it as follows:

<div my-directive>
    <input/textarea/select ng-model="", required/ng-required, ng-pattern, <custom directive validation>...
</div>

This will result in:

<div my-directive>
   <label for=<input'sname>>Texte</label>
   <input [attributes of the input]/>
   [additional content]
</div>

I've also managed to incorporate intermediary nodes or multiple inputs referencing the same ng-model, like checkboxes/radio buttons. However, support for different ng-models is yet to be fully implemented.

Answer 4

I have successfully developed a solution that functions as intended; allow me to share the pertinent section of code with you.

One particularly challenging aspect was reconnecting the input and validation to the parent controller's form.

To accomplish this, I had to incorporate several private AngularJS methods and properties:

 // Code snippet from Angular.js to modify $setValidity of ngModel for accessing the parent form...
  var VALID_CLASS = 'data-ng-valid',
    INVALID_CLASS = 'data-ng-invalid',
    PRISTINE_CLASS = 'data-ng-pristine',
    DIRTY_CLASS = 'data-ng-dirty',
    UNTOUCHED_CLASS = 'data-ng-untouched',
    TOUCHED_CLASS = 'data-ng-touched',
    PENDING_CLASS = 'data-ng-pending';
  
  // Various helper functions and main logic for setting validity

Next, in the link function:

function(scope, element, attrs, ctrl, transclude){
[...]
// Additional implementation details go here

The template variable contains the HTML structure around the input field, including labels, indicators for validity, etc.

EDIT: With my custom directive, I can utilize it as follows:

<div my-directive>
    <input/textarea/select ng-model="", required/ng-required, ng-pattern, <custom directive validation>...
</div>

This will result in:

<div my-directive>
   <label for=<input'sname>>Texte</label>
   <input [attributes of the input]/>
   [additional content]
</div>

I've also managed to incorporate intermediary nodes or multiple inputs referencing the same ng-model, like checkboxes/radio buttons. However, support for different ng-models is yet to be fully implemented.

Utilizing ngModel on input elements inside a custom directive, ensuring compatibility with other ng-* attributes

Answer №1

Answer №2

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