angular conditional class


Error trying to diff '[object Object]'. To toggle a class with Angular, we can use the [class.class-name] syntax to supply a condition to be evaluated: This [class] syntax is actually part of Angulars NgClass directive, through @Input('class'). For more complex expression, we can also use nested Ternary Operators as shown below: if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[336,280],'freakyjolly_com-large-mobile-banner-1','ezslot_10',610,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-freakyjolly_com-large-mobile-banner-1-0')}; On a single element, we may need to have more than one class based on their own expression. Wrong! We can also add multiple classes by adding a space after the first class name and writing the second class name. How to store decimal values in SQL Server. For elseif statement (less comparison) use like that: (For example you compare three statement). [class.my-class]="step==='step1'" Angular Conditional Class with *ngClass complete code (app.component.ts), How to Use ngclass with method in Angular Conditional Class, How to Use Angular ngClass with a condition, How to use Angular multiple ngclass conditions, Angular Material table dynamic columns, Filtering, Paging and event handling, How To Use *ngIf else In Angular 12 | ng-template, Use of HTTP Interceptor in Angular 12 RetryWhen & Authentication, Ways of binding CSS variables in Angular 12, Dynamic Sidenav Menu in Angular Material 13, Angular @input change detection | Angular 12. This is a very powerful way to change the style and add extra features without having to add extra HTML. If the condition is false, we will add different classes. In this example, we want to add an error class in a div element when a ticket is in the pending stage, and add the success class when it is in progress, we could do this: Syntax is : [ngClass]={className1: condition1, className2 : condition2 }, Syntax:[ngClass]=condition1 ? On the outside they look simple, but even skilled Angular devs havent grasped every concept in this eBook. So, first, we will add a condition in app.component.html and add a button with a click event that will change the condition, as shown below. "{'my_class': step === 'step1', 'my_class2' : step === 'step2' }", "{1 : 'my_class1', 2 : 'my_class2', 3 : 'my_class4'}[step]", "step == 'step1' ? In this article, Ill show you several ways to add them using the [ngClass] directive. Somehow I allways get the following Issue Code is: const foo = (foo: string) => { const result = [] result.push(foo) Issue with *ngFor, I cannot fetch the data from my component.ts to my component.html The Issue I installed CDK Virtual Scroller in my ionic 5.3.3 project: npm add @angular/cdk T Issue Recently I changed my custom input components to use react useFormContext instead o Issue I have a function that when calling it opens a modal from ngbModal, I have imported Issue I am trying to create a basic web component in Angular with Angular Elements. Lets consider an example of style binding. Join 78,277 developers pushing their limits. What seems to be wrong with my Angular code because I am getting the following error repeatedly : For your information, the latest Angular version 2+ provides several ways and types:-, To solve your ERROR, I would suggest READ MORE, You can use JavaRuntime.exec()to run python script, READ MORE, Use thefinalmodifier to enforce good initialization. Now, lets add an HTML element with ngClass with the condition using the variable message in app.component.html.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[580,400],'delftstack_com-banner-1','ezslot_2',110,'0','0'])};if(typeof __ez_fad_position!='undefined'){__ez_fad_position('div-gpt-ad-delftstack_com-banner-1-0')}; Then, lets add some CSS code to the class we are adding in the div based on the condition below. How to execute a python file with few arguments in java? Finally, we discussed how to use NgClass Angular directive and user various conditional expressions to control class names in multiple scenarios faced during development. Syntax is :[class.className1]=some condition. If the expression evaluates to an array, each element of the array should either be a string as in type 1 or an object as in type 2. You can think of NgClass as being able to specify multiple [class.class-name] on the same element. Angular version 2+ provides several ways to add classes conditionally: Note: Only a member of this blog may post a comment. admin: isAdmin, After creating our new application in Angular, we will go to our application directory using this command. 'class2' : 'class3')", "{'class_one': step === 'step1', 'class_two' : step === 'step2' }", "{1 : 'class_one', 2 : 'class_two', 3 : 'class_three'}[step]", "step == 'step1' ? In Angular we create components, which render a template. In this post youll learn how to use the NgClass directive in Angular to dynamically assign class names to elements or components. We already learned that [class] is an @Input('class') of NgClass - so what other syntax can we use? Web Application Programming in PicoLisp: Prefix Classes, Automating Angular Applications using Selenium with NgWebDriver. If both the conditions are satisfied, then the element is assigned both the classes. Additionally, you can add with method function: to extend MostafaMashayekhi his answer for option two>

The NgClass directive syntax is concise and supports more complex logic, to allow us to have finer control over our class names. Angular: conditional class with *ngClass Angular version 2+ provides several ways to add classes conditionally: * is only for the shorthand syntax for structural directives where you can for example use, See also https://angular.io/docs/ts/latest/api/common/index/NgClass-directive.html, See also https://angular.io/docs/ts/latest/guide/template-syntax.html. Syntax is : [ngClass]={class name here: condition here}. My recommendation is to use [class.class-name] where appropriate to keep things simple and clean, and where more complex class manipulation is needed - use the NgClass directive! This directive can be used to add/ remove classes by applying single or multiple conditions at the same time in a single [ngClass] directive. Now, lets create a variable Warnmessage and a function that will change the condition when clicking the button. We will introduce how to add conditional classes or use an if-else condition to display dynamic classes with ngClass in our Angular applications. No comments. you can also chain multiple options with a ',', Also *ngIf can be used in some of these situations usually combined with a *ngFor. If the expression evaluates to an object, then for each key-value pair of the object with a truthy value the corresponding key is used as a class name. LAMP vs MEAN: Which Tech Stack Should You Choose? 'is-active': isActive, This Angular post is compatible with Angular 4 upto latest versions, Angular 7, Angular 8, Angular 9, Angular 10, Angular 11, Angular 12 and Angular 13. currentTemperatureClass: Record = {}. 3:28 PM Angular and Typescript enthusiast. admin: isAdmin How to check for broken images in React JS, Unhandled Rejection (TypeError): Failed to fetch, React Hook "useCategory" cannot be called inside a callback, React Hooks - using useState vs just variables. This tutorial will discuss different ways to achieve an if-else statement inside ngClass in Angular.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'delftstack_com-medrectangle-4','ezslot_3',112,'0','0'])};if(typeof __ez_fad_position!='undefined'){__ez_fad_position('div-gpt-ad-delftstack_com-medrectangle-4-0')}; Lets create a new application using the following command. Avoid returning READ MORE, A simple example: We can also supply multiple classes inside the object: And there you have it, the power of NgClass for adding css classes to your elements or components in Angular. Ignoring Set, because no one uses this, lets look at the object literal approach { [klass: string]: any; }: This gives us the exact same result as [class.active]="isActive" but uses the NgClass directive to toggle a class. 'class_one' : 'class_two'", https://angular.io/docs/ts/latest/api/common/index/NgClass-directive.html, https://angular.io/docs/ts/latest/guide/template-syntax.html, Angular 6 Migration -.angular-cli.json to angular.json, What's alternative to angular.copy in Angular, I am new to angular. subscriber: !isAdmin I am getting the following error: Cannot read property 'remove' of undefined at BrowserDomAdapter.removeClass. 'show':''", "{'active': active_tab=='assignservice'}", "step === 'step1' ? Taking your React Website LIVE using GitHub Pages! Angular 13 How to Make REST Search Call using RxJS Debounce ? How to Pass Data From Parent To Child Components | @Input | With Source Code, Angular Unit Testing BehaviorSubject | Karma | Jamsine. angular, angular-ng-class, angular-template, css, javascript What is "not assignable to parameter of type never" error in TypeScript? XmlReader - Self-closing element does not fire a EndElement event? This is just one example, and its not common that we would need to supply 'inactive' in this case. Now, we will go through an example in which we will add a class based on the true condition. The directive operates in three different ways, depending on which of three types the expression evaluates to: All content on Query Threads is licensed under the Creative Commons Attribution-ShareAlike 3.0 license (CC BY-SA 3.0). Problem with gif with transparent background, Failed to load resource: the server responded with a status of 404 (not found), Python Certification Training for Data Science, Robotic Process Automation Training using UiPath, Apache Spark and Scala Certification Training, Machine Learning Engineer Masters Program, Post-Graduate Program in Artificial Intelligence & Machine Learning, Post-Graduate Program in Big Data Engineering, Data Science vs Big Data vs Data Analytics, Implement thread.yield() in Java: Examples, Implement Optical Character Recognition in Python, All you Need to Know About Implements In Java. Error: Unexpected value FormBuilder imported by the module DynamicTestModule. As you can see from the example, it is easy to use the if statement inside ngClass.

The conditional class implementation is divided into two distinct categories: single conditions and multiple conditions. How do you extract a column from a multi-dimensional array? When our isActive results to true the active class will be added (otherwise removed). We can even add triple classes or as many we want. How can we send message multiple time to a specific person or group in whatsapp using loop? The click event is changing the boolean value of the variable isGreen. Is it worth to migrate from Angular 2 to Angular 4? Object - keys are CSS classes that get added when the expression given in the value evaluates to a truthy value, otherwise they are removed.

The ng-class directive in Angular is used to dynamically add or remove classes on the element based on conditional expression applied. Share your feedback in the comment section. What is meant by passing the variable by value and reference in PHP? Angular | Ng-Class Conditional Expressions , If Else for Multiple and Single Class Names on Elements. Let, YourCondition is your condition or a boolean property, then do like this. 'my_class1' : 'my_class2'", "{'first': true, 'second': true, 'third': false}", https://angular.io/docs/ts/latest/api/common/index/NgClass-directive.html, https://angular.io/docs/ts/latest/guide/template-syntax.html, How to get Database Name from Connection String using SqlConnectionStringBuilder. Why it is necessary to refresh CSRF token per form request? DelftStack articles are written by software geeks like you. angularfix. 2022 Brain4ce Education Solutions Pvt. Using multiple classes is the real reason to use the NgClass directive. Issue I have created a custom ValidationFn in angular. Angular Conditional Class allows us to style elements based on some condition, Conditional CSS (Cascading Style Sheets) styles are useful for changing the color or font size of specific elements, and much more. 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This syntax means if temperature is 0, the class will be low. Add the following CSS style for box style and i-am-green-box background color. When the variable is passed as value READ MORE, In this case, I have noticed that READ MORE, In order to avoid an error while READ MORE, At least 1 upper-case and 1 lower-case letter, Minimum 8 characters and Maximum 50 characters. 'class1' : (step === 'step2' ? Premium Angular courses to skyrocket your skills to the top. How to write an ES6 class React Component that extends a functional component? Ltd. All rights Reserved. Please add an @NgModule annotation. This approach allows us to set a class via the native className property that we demonstrated above. When you login first time using a Social Login button, we collect your account public profile information shared by Social Login provider, based on your privacy settings. in angular 9, Error: Can't resolve 'core-js/es7/reflect' in '\node_modules\@angular-devkit\build-angular\src\angular-cli-files\models. We straightforwardly added a class based on the condition. What is wrong with my Angular code? How to set conditional classes in Angular? Angular provides multiple ways to add classes conditionally: by using ternary operator class1 and class2 is your class name, You can use [ngClass] or [class.classname], both will work the same. READ MORE, Hii, As you can see, thanks to the ngClass directive, we can add classes in different ways, depending on different conditions. How to Add Multiple Conditions in NgClass Directive in Angular? How can I pass a Bitmap object from one activity to another, Angular 2: formGroup expects a FormGroup instance. However, before we do lets look at how to use Angulars binding syntax to toggle a class. :]. Email me at this address if my answer is selected or commented on: Email me if my answer is selected or commented on, The difference between Classes, Objects, and Instances. Please refresh this page to activate it. For example, we can use it to style a div element in a specific color. Cannot read property 'remove' of undefined at and I thought to be the error in my [ngClass] condition but it turned out the property I was trying to access in the condition of [ngClass] was not initialized. This gives us four options for setting classes in Angular. You could use className to compose more complex classes, but this defeats the purpose of using NgClass in Angular. Sometimes we have to add dynamic classes or change classes based on conditions. 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