How to change the width or other css styles of a div in angular 5 by clicking a button? - dom

Question

I am trying to load a full width navigation bar by clicking a menu icon. And i am using angular 5. I have tried googling about DOM manipulation in angular 5+ versions but its really confusing and complicated.
My question is about how can i change or manipulate these html elements using angular(typescript) like we used to do with plain javascript and JQuery.
My question is all about changing the width of a div but i want to know how can i work with other css styles and DOM manipulation techniques.
Here is my code
home.component.html
<section id="top">
<div id="menu">
<a id="toggle" (click)="openMenu()" >
<i class="fa fa-bars menu-bar" aria-hidden="true"></i>
</a>
</div>
<div id="sidenav" class="overlay" ref="#sidenav">
×
<div class="overlay-content">
About
Services
Clients
Contact
</div>
</div>
<div id="heading">
<div id="logo">Koa</div>
<div id="tagline">next generation web framework for node.js</div>
</div>
</section>
home.component.ts
import { Component, OnInit } from '#angular/core';
#Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.scss']
})
export class HomeComponent implements OnInit {
constructor() { }
ngOnInit() {
}
}
styles.scss
/* You can add global styles to this file, and also import other style files */
#import "~bootswatch/dist/lux/_variables.scss";
#import "~bootstrap/scss/bootstrap.scss";
#import "~bootswatch/dist/lux/_bootswatch.scss";
body {
background-color: #F5F5F5;
}
//navbar
#menu {
position: fixed;
top: 35px;
right: 42px;
z-index: 50;
}
#menu a#toggle {
position: absolute;
top: 0;
right: 0;
padding: 15px;
background:transparent;
border-radius: 2px;
border: 1px solid transparent;
z-index: 5;
font-size: 1.3rem;
color: black;
}
//sidenav
.overlay {
height: 100%;
width: 0;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0, 0.9);
overflow-x: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 25%;
width: 100%;
text-align: center;
margin-top: 30px;
}
.overlay a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
}
.overlay .closebtn {
position: absolute;
top: 20px;
right: 45px;
font-size: 60px;
}
#media screen and (max-height: 450px) {
.overlay a {font-size: 20px}
.overlay .closebtn {
font-size: 40px;
top: 15px;
right: 35px;
}
}
//heading or showcase
#heading {
position: absolute;
top: 50%;
margin-top: -150px;
text-align: center;
width: 100%;
}
#logo {
font: 150px 'Italiana', sans-serif;
text-transform: lowercase;
}
#tagline {
font-size: 16px;
}

Answer 1

You can use [ngClass]="{'scssClassName': condition}" for conditioning class appendance on div like this:
<div class="existingClassWithNormalWidth" [ngClass]="{'scssClassNameWithFullWidth': condition}">{{childTags}}</div>.
You can also give different classes for different conditions on same tags like this: [ngClass]="{'scssClassName': condition, 'scssClassName2': condition2, 'scssClassName3': anyBooleanVariable,}"
You can set condition(or boolean) to be true by clicking button. Angular will automatically append the class to div itself.
You can also use [ngStyle] for only full width, but if you want to give extra style, you better make a class to SCSS and use [ngClass].
Find official doc for class https://angular.io/api/common/NgClass
(If you want to append class)
Find official doc for style only https://angular.io/api/common/NgStyle
(If only you want to make full width with ngStyle)