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Ionic 4 header animations

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# Hide Navigation Bar for Ionic 4

[![NPM version][npm-image]][npm-url]

With this module you can:
- implement an expansible header that stretches when pulling the page down
- auto-hide the page header when scrolling down

### 🔥 ..Also works with Supertabs 🔥

![](https://github.com/heidji/readme-content/blob/master/ionic4hidenav.gif?raw=true)

Check out the [example](https://github.com/heidji/ionic4-hidenav-example)

#### Note:
_Both should not be used together on the same page, either you want to make room for reading content or you want to add an expansible header, not both together :)_

_This plugin is also made as generic as possible, making it maybe a bit harder to setup but giving the user much more freedom to design what he wants._

## Installation

```
npm i ionic4-hidenav
```

## Implementation

Create (or modify if you already have) a **shared.module.ts** in your project root folder:

```typescript
import { NgModule } from '@angular/core';
import {HidenavModule} from 'ionic4-hidenav';

@NgModule({
    imports: [HidenavModule],
    exports: [HidenavModule]
})
export class SharedModule { }
```
and import the SharedModule on every page you intend to use this plugin:

```typescript
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Routes, RouterModule } from '@angular/router';

import { IonicModule } from '@ionic/angular';

import { HomePage } from './home.page';
import {SharedModule} from '../shared.module';

const routes: Routes = [
    {
        path: '',
        component: HomePage
    }
];

@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        IonicModule,
        RouterModule.forChild(routes),
        SharedModule
    ],
    declarations: [HomePage]
})
export class HomePageModule {
}
```
---

## Part 1: Expansible header
This is a custom component defined using this HTML tag:
```html
<hidenav-stretchheader></hidenav-stretchheader>
```
This component must be defined outside of `<ion-content>` and comes with required and optional child DOM elements:

## Creating the expansible header element

**home.page.html**

`#shrinkexpand`: This is the element that will shrink and expand with scrolling the page
`#static`: Element(s) with this tag will be left alone. You can use these to create buttons on your header for example.

```html
<hidenav-stretchheader header-height="50">
    <div #shrinkexpand></div>
    <div #static></div>
    <div #static></div>
</hidenav-stretchheader>
```

Inputs for `<hidenav-stretchheader>`:

| input             | type                         | Description                                                                    |
| ----------------- | ---------------------------- | ------------------------------------------------------------------------------ |
| `header-height`   | **required**                 | height to which the header shrinks to                                          |
| `opacity-factor`  | optional / default = 0       | `1 - 10` opacity of shrunk header overlay                                      |
| `opacity-color`   | optional / default = black   | accepts any css color description (name, rgb, # ..)                            |
| `blur-factor`     | optional / default = 0       | the maximum blur when the header is collapsed (accepts integer)                |
| `init-expanded`   | optional / default = false   | set to `true` if you want the header to initiate expanded                      |
| `no-border`       | optional / default = false   | set to `true` if you want to remove the bottom styling of the header           |
| Tabspage params only:                                                                                                             |
| `preserve-header` | optional / default = false   | set to `true` if you want to keep the header state separate on each tab        |

### Adding your Header to a simple page: 
add the `hidenav-sh-content` directive to your `<ion-content>`
````html
<hidenav-stretchheader header-height="50">
    <div #shrinkexpand>...</div>
</hidenav-stretchheader>
<ion-content hidenav-sh-content>
    ....
</ion-content>
````

### Adding your Header to a Supertabs Page:
You need to give the the `<ion-content>` that holds the `<super-tabs>` element the directive `hidenav-sh-tabscontent` then you need to add to each `<ion-content>` on every tab two directives: `hidenav-sh-content` and `hidenav-tabspage`
````html
<hidenav-stretchheader header-height="50">
  <div #shrinkexpand style="background: darkblue; color: gold" (click)="expand()" >...</div>
</hidenav-stretchheader>
<ion-content hidenav-sh-tabscontent>
  <super-tabs>
    <super-tabs-toolbar slot="top">
      <super-tab-button>...</super-tab-button>
      <super-tab-button>...</super-tab-button>
    </super-tabs-toolbar>
    <super-tabs-container>
      <super-tab>
        <ion-content hidenav-sh-content hidenav-tabspage>...</ion-content>
      </super-tab>
      <super-tab>
        <ion-content hidenav-sh-content hidenav-tabspage>...</ion-content>
      </super-tab>
    </super-tabs-container>
  </super-tabs>
</ion-content>
````

### Events: 
you can subscribe to the `(scroll)` event for example like:
```html
<hidenav-stretchheader (scroll)="handleScrollEvent($event)">...</hidenav-stretchheader>
```
The **$event** variable returns the current header height.
### Functions:

- `expand(duration)`: scrolls content to top and expands the header.
- `shrink(duration)`: scrolls just about enought to shrink the header if it is expanded.
- `toggle(duration)`: toggles between `expand()` and `shrink()`.

Note that `duration` is optional and defaults to 200.

---
## Part 2: Hide Header on scroll
This function is fairly simple to implement than the previous one, all you will have to do is define directives `hidenav-header` and `hidenav-content` in the page you want to use.

### Adding the hidenav component to a simple page
In the following example, both header and content carry the previously mentioned directives.
```html
<ion-header hidenav-header>...</ion-header>
<ion-content hidenav-content>...</ion-content>
```

### Adding the hidenav component to a Supertabs page
Give the `<ion-header>` the `hidenav-header` directive and the `<ion-content>` that holds the `<super-tabs>` component the directive `hidenav-tabscontent`.
As for the `<ion-content>` elements in each of the tabs give them the `hidenav-content` and `hidenav-tabspage` directive.
````html
<ion-header hidenav-header>...</ion-header>
<ion-content hidenav-tabscontent>
  <super-tabs>
    <super-tabs-toolbar slot="top">
      <super-tab-button>...</super-tab-button>
      <super-tab-button>...</super-tab-button>
    </super-tabs-toolbar>
    <super-tabs-container>
      <super-tab>
        <ion-content hidenav-content hidenav-tabspage>...</ion-content>
      </super-tab>
      <super-tab>
        <ion-content hidenav-content hidenav-tabspage>...</ion-content>
      </super-tab>
    </super-tabs-container>
  </super-tabs>
</ion-content>

````

**PS**.: as mentioned in the beginning, you should not use both methods (Part1 and Part2) together on one page. It was never tested and is not intended to be used.

[npm-url]: https://npmjs.org/package/ionic4-hidenav
[npm-image]: https://img.shields.io/badge/npm-1.0.0-green.svg

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