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For Angular 11 you can use version 2.1.0 which internally uses uses ResizeSensor from CSS Element Queries that is supported in IE.

But I'm not sure that's the best way either. Angular 14 directive for detecting changes of an element size. On mousedown, I could then check for the event.target accordingly. But that feels messy.Īlternatively, I could apply my directive to the via setting the selector. I suppose I could create a JS function that grabs the parent, checks for a matching class name of 'draggableContainer' and if so, done, if not, grabs the parent of that element, checks again, and so on until it finds the parent that matches. This allows me to set a mousedown HostListener to determine when a user has clicked on that object.īut.I don't see a clean 'angular way' to now change the css of the div two parents up. I initially set up a directive using as the selector. The goal here is to make ContainerBox movable on screen when a user clicks and drags on the child element DragHandle (note, the HTML for ContainerBox is in one component template, the HTML for DragHandle is in a different component template) HostBinding lets you set properties on the element or component that hosts the directive, and HostListener lets you listen for events on the host element or component.

The premise is that I have this type of structure: HostBinding and HostListener are two decorators in Angular that can be really useful in custom directives. To understand these two concepts, let us start by creating a simple custom attribute directive.I still have some plain-js/jquery thinking in my head and struggling to get the 'angular way' to handle this. The basic difference between a component and a directive is that a component has a template, whereas an attribute or structural directive does not have a template. There are three types of directives in Angular: By doing this, we can check on the window size every time the browser changes size, and this is what we will be using to tell our web app how to react. args - A set of arguments to pass to the handler method when the event occurs. There are two options that you can pass with the HostListener decorator- eventName - The DOM event to listen for. To understand and you should have basic knowledge about directives in Angular. Setting up a Host Listener in your class to listen to any changes The next step here is to set up a Host Listener to ‘listen’ dynamically to any changes with regards to ‘window: resize’. This decorator is quite useful to listen to events emitted by hostelement when creating a custom directive.