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ngx-modal-ease is a versatile Angular library providing a lightweight, simple, and performant modal.

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# ngx-modal-ease

# Description

ngx-modal-ease is a versatile Angular library providing a lightweight, simple, and performant modal. This library supports data communication between components, opening of multiple modals, custom animations, and a range of customisable options.

Support Angular version starts at v16 (see changelog).

# Demo

Live demonstration of the ngx-modal-ease library [here](https://greenflag31.github.io/modal-library/ngx-modal-ease).

# Installation

| Command                    | Description                                                                                                    |
| -------------------------- | -------------------------------------------------------------------------------------------------------------- |
| npm i ngx-modal-ease@0.0.6 | Install the V16 compatible version.                                                                            |
| npm i ngx-modal-ease@0.0.9 | Install the V17 compatible version.                                                                            |
| npm i ngx-modal-ease@0.1.2 | Install the V18 compatible version. This version is compatible with a zoneless, RxJs free Angular application. |
| npm i ngx-modal-ease@0.1.3 | Install the V19 compatible version.                                                                            |
| npm i ngx-modal-ease@0.1.4 | Install the V20 compatible version.                                                                            |
| npm i ngx-modal-ease       | Install the V21 compatible version.                                                                            |

# Options

The modal supports a range of customisable options:

```javascript
Options {
  modal?: {
    enter?: string;
    leave?: string;
    top?: string;
    left?: string;
  };
  overlay?: {
    enter?: string;
    leave?: string;
    backgroundColor?: string;
  };
  size?: {
    height?: string;
    maxHeight?: string;
    width?: string;
    maxWidth?: string;
    padding?: string;
  };
  actions?: {
    escape?: boolean;
    click?: boolean;
  };
  data?: {
    [key: string]: unknown;
  };
  injector?: Injector;
}
```

| Name            | Default             | Description                                                                                                                                                        |
| --------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| enter           |                     | Define the enter animation for the modal or the overlay respecting the [shorthand animation property](https://developer.mozilla.org/en-US/docs/Web/CSS/animation). |
| leave           |                     | Define the leave animation for the modal or the overlay respecting the [shorthand animation property](https://developer.mozilla.org/en-US/docs/Web/CSS/animation). |
| top             | 50                  | Top position of the modal in percent. Can be defined in any measure unit.                                                                                          |
| left            | 50                  | Left position of the modal in percent. Can be defined in any measure unit.                                                                                         |
| backgroundColor | rgba(0, 0, 0, 0.4); | Background color of the overlay. Can be defined in any color notation (rgba, hex, hsl, ...).                                                                       |
| minHeight       |                     | Minimum height of the modal. Can be defined in any measure unit.                                                                                                   |
| height          |                     | Height of the modal. Can be defined in any measure unit.                                                                                                           |
| width           |                     | Width of the modal. Can be defined in any measure unit.                                                                                                            |
| maxWidth        | 100                 | Max width of the modal in percent. Can be defined in any measure unit.                                                                                             |
| padding         | 0.5                 | Padding to be applied on the modal in rem. Can be defined in any measure unit.                                                                                     |
| escape          | true                | Enable escape to close the current modal.                                                                                                                          |
| click           | true                | Enable click outside of the modal to close the current modal.                                                                                                      |
| data            |                     | Data communication between components under the form of key-value pairs. Any type of data is supported.                                                            |

# Complete Example

Inject the ModalService through regular dependency injection in your component.

In the following example, `ModalContentComponent` is the content of the modal and should be provided as first parameter. As second parameter, provide an object respecting the `Options` interface (see above).

NB: _From the V18 compatible version, observables have been transformed to regular Promises to anticipate the future optional RxJS._

```javascript
  this.modalService.open(ModalContentComponent, {
    modal: {
      // animation
      enter: 'enter-scale-down 0.1s ease-out',
    },
    overlay: {
      // animation
      leave: 'fade-out 0.3s',
    },
    size: {
      // modal configuration
      width: '400px',
    },
    data: {
      // data to ModalContentComponent
      type: 'Angular modal library',
    },
  })
  // .then() or async/await for V18 compatible version
  .subscribe((dataFromModalContentComponent) => {
    ...
  });
```

Any type of data can be provided between components. Create the corresponding property (here, `type`) in your component (here, `ModalContentComponent`) and the property will be assigned with the provided value.

In your `ModalContentComponent`:
To pass information from the `ModalContentComponent` to your current component, inject the `ModalService` through regular dependency injection and call the `close(data)` method from the service with any data you wish to send back to your component. This method returns an RxJs subject (_a promise for V18 compatible version_), so subscribe to it as shown in the above example. It is not necessary to unsubscribe from the subscription since it will automatically `complete()` in the service.

```javascript
  // Inside ModalContentComponent
  onClose() {
    this.modalService.close(this.dataToSendBack);
  }
```

Publicly available methods have been exhaustively documented and typed, so you should get autocomplete and help from your code editor. Press on `CTRL + space` to get help on the available properties in the `Options` object.

# ModalService

This library exposes a `ModalService` that contains the following API:

```javascript
// Opens a component inside the modal
open<C>(componentToCreate: Type<C>, options?: Options);

// Close a modal with optional data to send back
close(data?: unknown);

// Close all opened modals
closeAll();
```

NB: Z-index of overlay and modal start at 1000 and 2000 respectively. In case of multiple modals, z-indexes will be incremented by 1000.

# Ready-to-use animations keyframes

This library comes with predefined and ready-to-use animations keyframes. Just fill in the `name`, `duration` and `easing function` (more info on the `animation CSS shorthand` [here](https://developer.mozilla.org/en-US/docs/Web/CSS/animation)). Those animations are _position agnostic_, so if you wish to position your modal at other `top` and `left` values than default, it will correctly work. Of course, you can create your own keyframes too.

```css
/* Recommended: 0.2s ease-out */
@keyframes enter-going-down {
  from {
    transform: translate(-50%, -60%);
  }
  to {
    transform: translate(-50%, -50%);
  }
}

/* Recommended: 0.2s linear */
@keyframes enter-scaling {
  from {
    transform: scale(0.8) translate(-50%, -50%);
    transform-origin: left;
  }
  to {
    transform: scale(1) translate(-50%, -50%);
    transform-origin: left;
  }
}

/* Recommended: 0.1s ease-out */
@keyframes enter-scale-down {
  from {
    transform: scale(1.5) translate(-50%, -60%);
    transform-origin: left;
  }
  to {
    transform: scale(1) translate(-50%, -50%);
    transform-origin: left;
  }
}

/* Recommended: 0.3s linear */
@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Recommended: 0.3s linear */
@keyframes fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

/* Recommended: 0.7s linear */
@keyframes bounce-in {
  0% {
    transform: translate(-50%, -85%);
  }
  18% {
    transform: translate(-50%, -50%);
  }
  60% {
    transform: translate(-50%, -65%);
  }
  80% {
    transform: translate(-50%, -50%);
  }
  90% {
    transform: translate(-50%, -53%);
  }
  100% {
    transform: translate(-50%, -50%);
  }
}

/* Recommended: 1s linear */
@keyframes scale-rotate {
  30% {
    transform: scale(1.05) translate(-50%, -50%);
    transform-origin: left;
  }
  40%,
  60% {
    transform: rotate(-3deg) scale(1.05) translate(-50%, -50%);
    transform-origin: left;
  }
  50% {
    transform: rotate(3deg) scale(1.05) translate(-50%, -50%);
    transform-origin: left;
  }
  70% {
    transform: rotate(0deg) scale(1.05) translate(-50%, -50%);
    transform-origin: left;
  }
  100% {
    transform: scale(1) translate(-50%, -50%);
    transform-origin: left;
  }
}
```

If you create your own keyframes, I would recommend to create a new file `modal-animations` (.css or preprocessor), and @import it in your `styles.css` (or preprocessor) at the root of the application.

# SSR (Server Side Rendering)

This library supports Server Side Rendering (SSR). The modal will not instantiate during server-side execution, as it requires access to the DOM API.

# DX Friendly

This library has been documented and should provide autocomplete and help from your code editor. Tested on VS Code.

# Performance

Emphasis has been placed on performance, adopting `ChangeDetectionStrategy.OnPush` strategy. This library respects Angular's mindset and use the Angular API to create components. Modal components will be removed from the DOM after closing.

# Change log

Version 0.0.4: Fixed of a communication bug between components. Every modal has now its own subject to send back data to the calling component.

Version 0.0.5: Fixed a bug between components that prevented the component from closing when applying different animations with multiple stacked modals.

Version 0.0.6: Added V16 backward compatibility support.

Version 0.0.8: Incorporated internal component destruction to ensure proper invocation of the child's OnDestroy lifecycle hook.

Version 0.1.0: Added the V18 version. This version is compatible with a zoneless Angular application. Optional RxJS has been anticipated, observables have been transformed to regular Promises / event listeners.

Version 0.1.1: Modification of the data response to better show the origin of the closing modal. Adding the possibility to provide an injector to the modal opening.

Version 0.1.4: Angular V20 support.

Version 0.1.5: Angular V21 support.

# Report a Bug

Please provide a detailed description of the encountered bug, including your options and the steps/actions that led to the issue. An accurate description will help me to reproduce the issue.

# Ngx-ease serie

You like this library? Discover the ngx-ease serie [here](https://www.npmjs.com/~greenflag31).

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