How to show hide loader on http call angular tutorial
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Загружено: 2025-06-01
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how to show/hide a loader on http calls in angular: a comprehensive tutorial
this tutorial will guide you through the process of displaying a loading indicator (spinner, progress bar, etc.) whenever your angular application makes an http request and hiding it once the request completes. this enhances the user experience by providing visual feedback that something is happening in the background, preventing them from thinking the application is frozen.
we'll cover multiple approaches, from simple component-level loading indicators to more sophisticated interceptor-based solutions for global management.
*why use a loader?*
*improved user experience:* users know something is happening in the background. prevents frustration and perceived slowness.
*visual feedback:* confirms that the application is responding to user interactions.
*professional look:* creates a more polished and professional application.
*prevents double clicks:* disable the ui during api calls to prevent accidental duplicate submissions.
*prerequisites:*
basic knowledge of angular (components, services, http module).
node.js and npm (or yarn) installed.
angular cli installed (`npm install -g @angular/cli`).
*project setup (if starting from scratch):*
1. create a new angular project:
2. generate a service for making http requests (optional, but recommended for organization):
3. generate a component to display the data and the loader:
*1. component-level loader (simple approach)*
this is the simplest approach, where you manage the loading state within a specific component.
*1.1. `data.service.ts` (example data service):*
*1.2. `data-display.component.ts` (component logic):*
*1.3. `data-display.component.html` (component template):*
*1.4. explanation:*
*`isloading` property:* a boolean property (`isloading`) in the component controls the visibility of the loader.
*setting `isloading`:*
...
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