A brief discussion on class and style binding in Angular10
This article will introduce to you the class and style binding in Angular. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
Binding of class and style in Angular10
1.classBinding
| Binding type | Syntax | Input type | Input value example |
|---|---|---|---|
| Single class binding | [class.foo]='flag' | boolean|undefined|null | true,false |
| Multiple class binding | [class]='classExpr' | string {[key :string]:boolean | undefined | null} Array |
'my-class1 my-class2' {foo: true, bar: false} ['foo ','bar'] |
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1.1 Single attribute binding
1. Basic syntax
<p> <button>修改flag的值</button></p>
2. When the value of the expression is true, Angular will add this class, and when it is false, it will remove
flag = truechangeFlag():void {
this.flag = !this.flag} 3. When flag is true 
4. When flag is false 
1.2 Multiple attribute binding - string form
1, string form
<p>绑定字符串的class</p>
classExpr:string = 'class-expr1 class-expr2 class-expr3'
2, binding result
1.3 Multiple attribute binding - object form
1, object form
<p>绑定对象形式的class</p>
classExpr:object = {
'foo': true,
'bar': false}
2, binding result
1.4 Multiple attribute binding-array form
1, array form
<p>绑定数组形式的class</p>
classExpr:Array<string> = ['foo','bar']</string>
2, binding result
2. styleBinding
| Binding type | Syntax | Input type | Input value example |
|---|---|---|---|
| Single style binding | [style.width]=“width” | string undefined null | "100px" |
| Single style binding with units | [style.width.px]="width" | number undefined null | 100 |
| Multiple style bindings | [style]="styleExpr" | string {[key: string]: string undefined null} |
"width: 100px; height: 100px" {width: '100px', height: '100px'} |
2.1 Single attribute
1. The form of a single attribute
<p>绑定单个形式的style</p>
styleExpr:string = '100px'
2. Binding result
2.2 Single attribute with unit
1, with unit
<p>绑定单个形式的style</p>
2, binding result
2.3 Multiple attributes Binding
<p>绑定多个形式的style</p>
1, string
styleExpr:string = 'width: 100px;height: 200px'
2, object
styleExpr:object = {
width: '100px',
height: '200px'}
3, result graph
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