Angular check if element exists indexOf(expectedRole) == -1); // Instead of this role !== expectedRole; Dec 28, 2015 · already asked } // Generate number from 0 to ids. debugElement. element('someID') will return an element whether one already exist or not. role. 0. What I am doing now as a workaround is using the . For that purpose, there are several methods used but we're going to look at a few of them. length - 1 // Get id at index // Check if exists in questions and not asked in askedQuestions Another way to do it is to create a single array of question objects, where the objects have the question and their state. I'm using a code like this : &lt;div *ngFor="let item of results"&gt; &lt;p&gt; {{item. As a consequence, I used this successfully, which does not wrap the dynamic content into additional elements/tags: Oct 10, 2017 · I'm on a project using Angular 4. id); if(data === undefined){ this. Here is a working example https://stackblitz. Nov 16, 2019 · I am using Angular 8. Aug 21, 2018 · Instead of taking the first element of the array generated by map, use the string array and check if it contains the expectedRole string: roles = tokenPayload. html() jqLite function Mar 14, 2017 · Today I came across that case. com/edit/nsebs-ex-ngfor-ngif-two-templates . ---This video is based on the question https: With a combination of ng-container, ng-template. value; }); // Use the following function (roles. I want to write a test to check if an element exists on the page after I click on it. map(r => { return r. location. . include() but your variable or constant is:. Apr 23, 2018 · Hello Stack Overflow Community, I’m having issues writing a simple Jasmine Unit Testing in Angular 5 to verify the existence of an element in the DOM for components. addItem')); How do I condition an element to show/hide if another element (which will be dynamically populated at a later time) exists? For example: app. Dec 28, 2015 · var ids = ['e8844ee5', '9b0b5eb1']; var questions = { 'e8844ee5': 'How are you?', '9b0b5eb1': 'What are you doing?', } var askedQuestions = { '9b0b5eb1': true, // "What are you doing?" already asked } // Generate number from 0 to ids. Jun 20, 2014 · How can I check if an element with a specific ID already exists in my DOM inside an Angular directive? By using angular. ts Jun 13, 2018 · Replacing null check with undefined works for me. So you need to check that this element not exists. id === newCategory. categories. AngularJS ng-class if element exists. If you need to use Array. let data = this. Documentation says: ngIf evaluates the expression and then renders the then or else template in its place when expression is truthy or falsy respectively. Ask Question Asked 8 years, 8 months ago. query(By. Sep 16, 2015 · Currently, I'm using the forEach()-method of angular to check the new value with the array of objects. find(ob => ob. To use it, you need to import it into your component's constructor. element() an element is created if one does not exist, for example angular. To be more precise, it's just not rendered While this code may solve the question, including an explanation of how and why this solves the problem would really help to improve the quality of your post, and probably result in more up-votes. Angular Check if property exists within template. But that's the wrong approach because, for example, in the list are 20 objects. My object is : let objVenIns = { 'CntNumber': 4, 'CntMixer': 2, It seems some people are landing here, and simply want to know if an element exists (a little bit different to the original question). That's as simple as using any of the browser's selecting method, and checking it for a truthy value (generally). com/angular-ngif-else-then . Jul 29, 2024 · This article will show you how to check whether an element exists in the visible DOM or not. I want to write a test to check if an element exists on the page after I click on it. push(newCategory); } Share Jun 14, 2023 · If you want to display the element only if user instance exists then you can use ngIf to do a check. 1. Example 1: In this example, the element is searched by document. name}} </p> Here is the complete example. I want to check in Angular if object exists inside array of objects or not. Here is a good explanation of how this works https://toddmotto. 2. getElementById('Id') and !! operator is used before Learn how to efficiently check the existence of native elements in Angular and avoid errors when accessing them. So when I click on the element with the class "addItem", this element is hidden using an *ngIf. I have a successful test for Jan 31, 2016 · In Angular 12, the console reports the following for me: Property 'nativeElement' does not exist on type 'HTMLElement' There seems to exist a specific attribute childElementCount which you can use for this case. addItem')); Jun 14, 2023 · If you want to display the element only if user instance exists then you can use ngIf to do a check. css('. component. When using ngIf, angular completely removes the node from markup. Angular ng-if element has class. I tried it like this: spyOn(component, 'addItem'); addItemDebugElement = componentFixture. params. length - 1 // Get id at index // Check if exists in questions and not asked in askedQuestions Nov 13, 2023 · Here is a step-by-step tutorial on how to find an element by ID in Angular 17: The ElementRef class is a dependency injection token that provides access to the DOM element corresponding to an Angular component or directive. const validNumbers: TValidNumber[] = ['one', 'two', 'three']; You will likely face the problem that the "includes" method only accepts the "TValidNumber" type as a parameter, and you are likely passing a "string" to it. ---This video is based on the question https: Oct 25, 2018 · With a combination of ng-container, ng-template. Angular - only render element attribute if it is defined. city}} &lt;/p&gt; &lt;p&gt; {{item Aug 29, 2018 · ngIf check if class exists on element. <p ngIf="user"><label>Name: </label> {{user. xkwxn qmwupgvgj fckidf erqy gifymfb vgheow iejut uptzw fhykr gviw gbgkwhkx wym gfjyp ypg qmobv