Encountering a problem with the Ionic Modal Slider: unable to locate the matching element associated with delegate-handle= when using $

I am encountering a problem with my Ionic application that features multiple Angular controllers. Specifically, I have a LoginCtrl and RegisterCtrl controller set up. The issue arises when I try to trigger a modal with a slider from the RegisterCtrl by using $emit within the LoginCtrl:

Modal Template HTML

<!-- This is a simplified version of the code -->
<ion-content class="register-wrapper">
    <ion-slide-box delegate-handle="registerSlider" show-pager="false">
        <ion-slide class="padding">
            Slide 1
        </ion-slide>
        <ion-slide class="padding">
            Slide 2
        </ion-slide>
        <ion-slide class="padding">
            Slide 3
        </ion-slide>
    </ion-slide-box>

</ion-content>

LoginCrtl

$rootScope.$emit("showRegisterPopup", {data:'somedata'});

RegisterCrtl

// Below is an abbreviated version of the code
$ionicModal.fromTemplateUrl('templates/modals/register-form1.html', {
    scope: $scope,
    animation: 'slide-in-up'
}).then(function (modal) {
    $scope.modal = modal;
    $scope.registerModalSlider = $ionicSlideBoxDelegate.$getByHandle('registerSlider');
    $scope.registerModalSlider.enableSlide(false);
});

$rootScope.$on("showRegisterPopup", function(emitEvent, somedata){
    if ($scope.registerModalSlider){
        $timeout(function({
            $scope.registerModalSlider.slide(2);
        },200);
    }
    rc.showRegister();
});

Unfortunately, when attempting to execute the .slide() function of the slider, it fails to navigate to the designated page and prompts the error message below:

Delegate for handle "registerSlider" could not find a corresponding element with delegate-handle="registerSlider"! slide() was not called!
Possible cause: If you are calling slide() immediately, and your element with delegate-handle="registerSlider" is a child of your controller, then your element may not be compiled yet. Put a $timeout around your call to slide() and try again.

This error persists even though I have already defined the delegate-handle in the HTML and included a timeout around the .slide() method call.

javascriptangularjscordovaionic-framework

Answer №1

One way I found to resolve this issue was by utilizing the "active-slide" attribute on the slider component. Essentially, you can set it to an integer value that corresponds to the index of the slide you want to display.

Here's an example:

<ion-slide-box delegate-handle="registerSlider" show-pager="false" active-slide="currentSlide">
</ion-slide-box>

In the controller:

//Instead of:
if ($ionicSlideBoxDelegate.$getByHandle('registerSlider')){
    $ionicSlideBoxDelegate.$getByHandle('registerSlider').slide(2);
}

// You can do this...
$scope.currentStep = 2;

Answer №2

A resolution for the problem can be found by referencing the related GitHub issue.

To address the issue, a member included a delegateHandle attribute in the scope to allow for interpolation.

Utilizing a universal-directive, demonstrated in this example, make the following adjustments:

As shown:

scope: {
        //
        delegateHandle: '@'
      }

Next, modify this line of code:

`$scope.registerModalSlider = $ionicSlideBoxDelegate.$getByHandle('registerSlider',$attr.delegateHandle);

to

$scope.registerModalSlider = $ionicSlideBoxDelegate.$getByHandle('registerSlider',$scope.delegateHandle);

With these changes, delegates will now interpolate correctly and handles can be accessed accurately.

Additionally, as recommended by @mikesurowiec, you can implement a directive to create a 

randomly generated delegate handle
:

angular.module('app').directive('randomDelegateHandle', [function () {
  return {
    priority: 1000,
    restrict: 'A',
    compile: function compile(tElement, tAttrs, transclude) {
        tAttrs.$set('delegateHandle', Math.random().toString(36).substring(7));
        return function postLink(scope, iElement, iAttrs, controller) {}
    }
};

}]);

An alternative solution is also available in the GitHub Issues section.

This information could prove useful.

Credit goes to the GitHub issues and the mentioned authors

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