Angular Ui Router Open Modal Window On Url Change

Angular UI Router is a powerful tool that allows developers to create dynamic single-page applications with ease. One common requirement in many applications is to open a modal window when the URL changes. This can be useful for displaying important information or getting user input without navigating away from the current page. In this article, we will discuss how to achieve this functionality using Angular UI Router.

To open a modal window when the URL changes, we first need to define our modal component. In Angular, we can easily create a modal component using Angular Material or any other modal library of your choice. Make sure to configure the modal component to be hidden by default.

Next, we need to update our Angular UI Router configuration to listen for URL changes and trigger the modal open action. We can achieve this by using the `$transitions` service provided by UI Router. The `$transitions` service allows us to monitor state transitions and execute custom logic when specific events occur.

In our Angular controller or component, we can inject the `$transitions` service and add a transition hook to detect URL changes. When a URL change is detected, we can then call a function to open the modal window.

app.run(function($transitions, $uibModal) {
    $transitions.onStart({}, function(transition) {
        $uibModal.open({
            templateUrl: 'modal.html',
            controller: 'ModalController'
        });
    });
});

In the example above, we are using `$uibModal` from Angular UI Bootstrap to open the modal window when a URL change is detected. Make sure to replace `'modal.html'` with the correct path to your modal template and `'ModalController'` with the appropriate controller for your modal component.

Additionally, you may need to handle closing the modal window when the user navigates away from the current page. To achieve this, you can use the `$transitions` service to detect state changes and close the modal window accordingly.

app.run(function($transitions, $uibModal) {
    var modalInstance;

    $transitions.onStart({}, function() {
        modalInstance = $uibModal.open({
            templateUrl: 'modal.html',
            controller: 'ModalController'
        });
    });

    $transitions.onSuccess({}, function() {
        if (modalInstance) {
            modalInstance.close();
        }
    });
});

In the updated example above, we are storing a reference to the modal instance when opening the modal window. When a state change is successful, we check if the modal instance exists and close it if necessary.

By incorporating these techniques into your Angular UI Router configuration, you can easily open a modal window when the URL changes in your single-page application. This can enhance user experience and provide a convenient way to display information or gather input without disrupting the user flow.