Add HTML elements into Angular Component

Question

How to add a angular html element into a component in run time.

Let the html element is a H1 tag having angular expression.

<h1>{{testHeading}}</h1>

I want to insert this tag into a component. With persisting it's dynamic angular property. Here "testHeading" is a angular variable.

Am trying to add the element using the following method:

addComponent(component:any){
    let componentRef = this.componentFactoryResolver
    .resolveComponentFactory(component)
    .create(this.injector);

    this.appRef.attachView(componentRef.hostView);

    const domElem = (componentRef.hostView as EmbeddedViewRef<any>)
    .rootNodes[0] as HTMLElement;

    var newcontent = document.createElement('div');
    newcontent.innerHTML = `<h1>${this.demoText}</h1>`;
    domElem.appendChild(newcontent);

    document.getElementById("testid").appendChild(domElem);
}

You should go with dynamic component loader ref: angular.io/guide/dynamic-component-loader — Suryan
– Suryan, Commented Oct 24, 2018 at 7:19

dantheman2865 · Accepted Answer · 2023-07-10 14:57:21Z

2

Create a container in your template

<div #container></div>

Create a container reference by

@ViewChild('container') container: ElementRef;

And after view init you can access the container element for example by

container.nativeElement.innerHTML = `<h1>${yourString}</h1`;

Edit 2023: Updated ViewChild syntax

edited Jul 10, 2023 at 14:57

dantheman2865

3351 silver badge14 bronze badges

answered Oct 24, 2018 at 7:28

Felix Lemke

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10 Comments

Sanjaya Over a year ago

Great solution my dear bro, It's working fine. But I've one doubt what is the ${yourString}. I have never use a expression like this, I always use {{yourString}}. Could you please explain this or share a ref link where I'll get know about ${yourString} method.

Felix Lemke Over a year ago

You're welcome :) since it seems you are new to SO: If solutions are working for you, you should except the related answers as well.

Harun Or Rashid Over a year ago

{{yourString}} is interpolation in .html. ${yourString} is interpolation in .ts.

Felix Lemke Over a year ago

@HarunurRashid this actually is the .ts file.

Sanjaya Over a year ago

@ngfelixl, One more thing in the expression ${yourString}` if I need to declare the variable 'yourString' in the child component where I need insert the HTML element (<h1>).Then it will showing error that 'yourString' is not defined, in the parent component. Is there any solution for this?

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