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Sass: @if and @else
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- Summary of article content: Articles about Sass: @if and @else The @if rule is written @if
{ … } , and it controls whether or not its block gets evaluated (including emitting any s as CSS). … - Most searched keywords: Whether you are looking for Sass: @if and @else The @if rule is written @if
{ … } , and it controls whether or not its block gets evaluated (including emitting any s as CSS). Syntactically Awesome Style Sheets - Table of Contents:
Black Lives Matter
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@else permalink@else
Truthiness and Falsiness permalinkTruthiness and Falsiness
SCSS câu lệnh @if @else | Hướng dẫn học SCSS | Học web chuẩn
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- Summary of article content: Articles about SCSS câu lệnh @if @else | Hướng dẫn học SCSS | Học web chuẩn Ví dụ về SCSS @if @else. Mẫu dành cho position. Ta sẽ thử xây dựng một @mixin của thuộc tính position , sẽ xác … …
- Most searched keywords: Whether you are looking for SCSS câu lệnh @if @else | Hướng dẫn học SCSS | Học web chuẩn Ví dụ về SCSS @if @else. Mẫu dành cho position. Ta sẽ thử xây dựng một @mixin của thuộc tính position , sẽ xác … SCSS câu lệnh if, hướng dẫn cách viết câu lệnh điều kiện if, có nhiều ví dụ minh họa.scss if,scss if else,scss câu lệnh if,scss if clause,scss câu lệnh if là gì,scss câu lệnh if la gi,what is scss if clause,học câu lệnh if scss,hướng dẫn câu lệnh if scss,huong dan hoc câu lệnh if scss,hướng dẫn học scss câu lệnh if,cấu trúc scss câu lệnh if,cau truc scss câu lệnh if,scss câu lệnh if structure,thiết kế web
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Sass/SCSS if, else if & else (Conditional Control) Tutorial | KoderHQ
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- Summary of article content: Articles about Sass/SCSS if, else if & else (Conditional Control) Tutorial | KoderHQ The if conditional statement … An if statement will evaluate a condition. If the condition proves true, the compiler will execute the if statement’s code block. …
- Most searched keywords: Whether you are looking for Sass/SCSS if, else if & else (Conditional Control) Tutorial | KoderHQ The if conditional statement … An if statement will evaluate a condition. If the condition proves true, the compiler will execute the if statement’s code block. Learn how to control the flow of Sass with conditional statements. We cover the if statement, the else if ladder and the else fallback.
- Table of Contents:
What is conditional control
The if conditional statement
The conditional else if ladder
The else fallback statement
True and False
Summary Points to remember
conditional – Syntax for if/else condition in SCSS mixin – Stack Overflow
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- Summary of article content: Articles about conditional – Syntax for if/else condition in SCSS mixin – Stack Overflow You can assign default parameter values inline when you first create the mixin: @mixin clearfix($wth: ‘auto’) { @if $wth == ‘auto’ { // if wth is not … …
- Most searched keywords: Whether you are looking for conditional – Syntax for if/else condition in SCSS mixin – Stack Overflow You can assign default parameter values inline when you first create the mixin: @mixin clearfix($wth: ‘auto’) { @if $wth == ‘auto’ { // if wth is not …
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Sass Control Directives – @if, @else, @while, @for, @each
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- Summary of article content: Articles about Sass Control Directives – @if, @else, @while, @for, @each Both @else if and @else must follow an @if directive. The @else if condition will only be evaluated if the @if condition is true. The @else expression, which … …
- Most searched keywords: Whether you are looking for Sass Control Directives – @if, @else, @while, @for, @each Both @else if and @else must follow an @if directive. The @else if condition will only be evaluated if the @if condition is true. The @else expression, which … if,while, for, each, control directives, conditional directives,sass tutorial, sass, learn sass, sass tutorials, sass step by step, sass tricks, sass for beginners, sass Basics, learn sass, learn sass from scratch Learn about Sass control directives here such as if, else if, while, for to, each.
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Conditional Execution – @if
Conditional Looping – @while
Unconditional Looping – @for
@each
Cấu trúc logic khi sử dụng SASS, SCSS
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- Summary of article content: Articles about Cấu trúc logic khi sử dụng SASS, SCSS Điểu kiện @if và @else trong SCSS. Điều kiện logic là true/false có thể sử dụng toán tử logic ở dưới. Toán tử … …
- Most searched keywords: Whether you are looking for Cấu trúc logic khi sử dụng SASS, SCSS Điểu kiện @if và @else trong SCSS. Điều kiện logic là true/false có thể sử dụng toán tử logic ở dưới. Toán tử … Tìm hiểu cách viết các biểu thức số học, mixin, các hàm, các điều kiện và vòng lặp trong SASS, SCSS
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Sử dụng biểu thức số học đơn giản SCSS
Sử dụng @mixin
Khai báo và sử dụng hàm trong SASSSCSS
Điểu kiện @if và @else trong SCSS
Vòng lặp @for trong SCSS
Sass – if() Function
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- Summary of article content: Articles about Sass – if() Function Sass – if() Function, Based on the condition, this built-in if() function returns only one result from two possible outcomes. The result of the function can … …
- Most searched keywords: Whether you are looking for Sass – if() Function Sass – if() Function, Based on the condition, this built-in if() function returns only one result from two possible outcomes. The result of the function can … Sass – if() Function, Based on the condition, this built-in if() function returns only one result from two possible outcomes. The result of the function can be referred to the variab
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Description
Syntax
Example
if_functionhtml
stylescss
stylecss
Output
SASS | @if and @else – GeeksforGeeks
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- Summary of article content: Articles about SASS | @if and @else – GeeksforGeeks SASS | @if and @else · @if: @if block will be compiled if the value of the conditional expression is true. · @else: If the values of conditional … …
- Most searched keywords: Whether you are looking for SASS | @if and @else – GeeksforGeeks SASS | @if and @else · @if: @if block will be compiled if the value of the conditional expression is true. · @else: If the values of conditional … A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.
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Sass: @if and @else
The @if rule is written @if
{ … } , and it controls whether or not its block gets evaluated (including emitting any styles as CSS). The expression usually returns either true or false —if the expression returns true , the block is evaluated, and if the expression returns false it’s not. SCSS
Sass
CSS SCSS Syntax @mixin avatar ( $size , $circle : false ) { width : $size ; height : $size ; @if $circle { border-radius : $size / 2 ; } } .square-av { @include avatar ( 100px , $circle : false ); } .circle-av { @include avatar ( 100px , $circle : true ); } Sass Syntax @mixin avatar ( $size , $circle : false ) width : $size height : $size @if $circle border-radius : $size / 2 .square-av @include avatar ( 100px , $circle : false ) .circle-av @include avatar ( 100px , $circle : true ) CSS Output .square-av { width : 100px ; height : 100px ; } .circle-av { width : 100px ; height : 100px ; border-radius : 50px ; }
An @if rule can optionally be followed by an @else rule, written @else { … } . This rule’s block is evaluated if the @if expression returns false .
SCSS
Sass
CSS SCSS Syntax $light-background : #f2ece4 ; $light-text : #036 ; $dark-background : #6b717f ; $dark-text : #d2e1dd ; @mixin theme-colors ( $light-theme : true ) { @if $light-theme { background-color : $light-background ; color : $light-text ; } @else { background-color : $dark-background ; color : $dark-text ; } } .banner { @include theme-colors ( $light-theme : true ); body .dark & { @include theme-colors ( $light-theme : false ); } } Sass Syntax $light-background : #f2ece4 $light-text : #036 $dark-background : #6b717f $dark-text : #d2e1dd @mixin theme-colors ( $light-theme : true ) @if $light-theme background-color : $light-background color : $light-text @else background-color : $dark-background color : $dark-text .banner @include theme-colors ( $light-theme : true ) body .dark & @include theme-colors ( $light-theme : false ) CSS Output .banner { background-color : #f2ece4 ; color : #036 ; } body .dark .banner { background-color : #6b717f ; color : #d2e1dd ; }
Conditional expressions may contain boolean operators ( and , or , not ).
You can also choose whether to evaluate an @else rule’s block by writing it @else if
{ … } . If you do, the block is evaluated only if the preceding @if ‘s expression returns false and the @else if ’s expression returns true . In fact, you can chain as many @else if s as you want after an @if . The first block in the chain whose expression returns true will be evaluated, and no others. If there’s a plain @else at the end of the chain, its block will be evaluated if every other block fails.
SCSS
Sass
CSS SCSS Syntax @use “sass:math” ; @mixin triangle ( $size , $color , $direction ) { height : 0 ; width : 0 ; border-color : transparent ; border-style : solid ; border-width : math . div ( $size , 2 ); @if $direction == up { border-bottom-color : $color ; } @else if $direction == right { border-left-color : $color ; } @else if $direction == down { border-top-color : $color ; } @else if $direction == left { border-right-color : $color ; } @else { @error “Unknown direction #{ $direction } .” ; } } .next { @include triangle ( 5px , black , right ); } Sass Syntax @use “sass:math” @mixin triangle ( $size , $color , $direction ) height : 0 width : 0 border-color : transparent border-style : solid border-width : math . div ( $size , 2 ) @if $direction == up border-bottom-color : $color @else if $direction == right border-left-color : $color @else if $direction == down border-top-color : $color @else if $direction == left border-right-color : $color @else @error “Unknown direction #{ $direction } .” .next @include triangle ( 5px , black , right ) CSS Output .next { height : 0 ; width : 0 ; border-color : transparent ; border-style : solid ; border-width : 2.5px ; border-left-color : black ; }
Truthiness and Falsiness permalink Truthiness and Falsiness
Anywhere true or false are allowed, you can use other values as well. The values false and null are falsey, which means Sass considers them to indicate falsehood and cause conditions to fail. Every other value is considered truthy, so Sass considers them to work like true and cause conditions to succeed.
For example, if you want to check if a string contains a space, you can just write string.index($string, ” “) . The string.index() function returns null if the string isn’t found and a number otherwise.
SCSS câu lệnh @if @else
Ví dụ về SCSS @if @else
Mẫu dành cho position
Ta sẽ thử xây dựng một @mixin của thuộc tính position , sẽ xác định theo tên vị trí $pos , và giá trị trục $y và trục $x tương ứng.
SCSS CSS @mixin position ($pos,$y,$x) { position: absolute; @if $pos == ‘tl’ { left: $x; top: $y; } @else if $pos == ‘tr’ { right: $x; top: $y; } @else if $pos == ‘bl’ { left: $x; bottom: $y; } @else if $pos == ‘br’ { right: $x; bottom: $y; } } #main { position: relative; .box01 { @include position (‘tl’,20px,40px) } .box02 { @include position (‘bl’,50px,30px) } } #main { position: relative; } #main .box01 { position: absolute; left: 40px; top: 20px; } #main .box02 { position: absolute; left: 30px; bottom: 50px; }
‘tl’ : top left
: top left ‘tr’ : top right
: top right ‘bl’ : bottom left
: bottom left ‘br’ : bottom right
Ta thấy các với các giá trị khai báo vị trí như trên ta có thể sử dụng rất gọn thuộc tính position .
Mẫu dành cho border-position
Ta sẽ thử xây dựng một @mixin khác của thuộc tính border-radius với các góc xác định theo theo tên vị trí $pos , và giá trị bo góc $raidus .
SCSS CSS @mixin bdr-position ($pos,$radius) { border-radius: 0; @if $pos == ‘top’ { border-#{$pos}-left-radius: $radius; border-#{$pos}-right-radius: $radius; } @else if $pos == ‘bottom’ { border-#{$pos}-left-radius: $radius; border-#{$pos}-right-radius: $radius; } @else if $pos == ‘right’ { border-bottom-#{$pos}-radius: $radius; border-top-#{$pos}-radius: $radius; } @else if $pos == ‘left’ { border-bottom-#{$pos}-radius: $radius; border-top-#{$pos}-radius: $radius; } } #main { @include bdr-position (top,4px) } #main { border-radius: 0; border-top-left-radius: 4px; border-top-right-radius: 4px; }
Với các giá trị khai báo vị trí như trên ta có thể border góc cho thành phần rất dễ.
Sass/SCSS if, else if & else (Conditional Control) Tutorial
Sass/SCSS if, else if & else (Conditional Control) Tutorial
What is conditional control
Sass allows us to control the flow of our scripts through specific expressions that evaluate conditions.
Based on the result of these conditions, Sass will execute certain sections of specified code.
The if conditional statement
An if statement will evaluate a condition. If the condition proves true, the compiler will execute the if statement’s code block.
If the condition proves false, the compiler will move on to code outside and below the if statement’s code block.
An if statement is written with the @if rule, followed by the condition we want to evaluate and a code block.
Syntax: SCSS Copy
@if condition { // if condition proves true // execute everything in the // code block }
Example: SCSS Copy
$circle : true ; $size : 100 px ; .user__avatar { width : $size ; height : $size ; @if $circle == true { border-radius : $size / 2 ; } }
In the example above we check to see if the value of $circle is true.
In this case it proved true so the code in the if statement’s code block executed and the CSS was compiled with a radius of 50px .
Output: Compiled CSS Copy
.user__avatar { width : 100 px ; height : 100 px ; border-radius : 50 px ; }
When checking for true or false values, we don’t need to specify our equality operator == or the keywords true or false .
Example: SCSS Copy
$circle : true ; $size : 100 px ; .user__avatar { width : $size ; height : $size ; @if $circle { border-radius : $size / 2 ; } }
The conditional else if ladder
When we have multiple conditions that need to be evaluated with their own execution code, we use the else if ladder.
The compiler will move to evaluate each if statement in the ladder when it’s done with the previous one.
To write a conditional else if statement, we add another if statement below our first, separated by the else keyword.
Syntax: SCSS Copy
@if condition-1 { // if condition-1 proves // true execute this code } @else if condition-2 { // otherwise, evaluate if // condition-2 is true } @else if condition-3 { // otherwise, evaluate if // condition-3 is true etc. }
Example: SCSS Copy
$border : left ; .bordered { @if $border == top { border-top : 1 px solid #000 ; } @else if $border == right { border-right : 1 px solid #000 ; } @else if $border == bottom { border-bottom : 1 px solid #000 ; } @else if $border == left { border-left : 1 px solid #000 ; } }
The examples above will check which side we want our border to be based on the value in the $border variable.
Output: Compiled CSS Copy
.bordered { border-left : 1 px solid #000 ; }
When the if statement evaluated to false, the compiler started to move down the ladder to evaluate the next if statement until it got to the condition that proved true.
note The else if ladder cannot stand on its own. It has to be preceded by an if statement.
The else fallback statement
The else statement works as a catch-all fallback for anything that isn’t covered by an if statement or else if ladder.
Because it acts as a catch-all, the else statement doesn’t have a conditional block, only an execution code block.
Syntax: SCSS Copy
@if condition { // if condition proves // true execute this code } @else { // otherwise, execute this // else code block }
Example: SCSS Copy
$dark-theme : true ; @if $dark-theme { color : #dedede ; font-weight : 300 ; background-color : #191919 ; } @else { color : #191919 ; font-weight : 400 ; background-color : #fafafa ; }
note The else statement cannot stand on its own either. It must be preceded by an if statement or an else if ladder. The else fallback must also be the last statement in a conditional chain, we cannot have an else if ladder below it.
True and False
Sass true and false values are not the same as those in traditional programming languages.
In Sass, a false value can only be false or null . Any other value, like empty strings, lists and the number 0, is considered to be a true value.
Summary: Points to remember
So you have finished reading the scss if topic article, if you find this article useful, please share it. Thank you very much. See more: Boolean scss, Random in scss, Scss apply, Sass interpolation, Debug Sass, Parse scss, Sass array, Use SCSS
