How To Iterate Using Ngfor Loop Map Containing Key As String And Values As Map Iteration

If you're working with Angular and need to iterate over a map that contains keys as strings and values as maps, the `*ngFor` directive combined with the keyvalue pipe can be your best friend. By following a few simple steps, you can effectively iterate through your data structure in Angular and access the keys and nested values within the map. Let's dive into how you can achieve this with the NgFor loop.

Firstly, ensure that you have your map set up with keys as strings and values as maps. This structure will allow you to access the key and the nested values during iteration seamlessly.

Next, in your Angular component, make sure you have the map data available for binding in your template. You can assign your map to a variable in your component class, which will then be accessible within your template.

In your component class:

Typescript

mapData: Map&lt;string, Map&gt; = new Map([
  ['key1', new Map([['nestedKey1', 'value1'], ['nestedKey2', 'value2']])],
  ['key2', new Map([['nestedKey3', 'value3'], ['nestedKey4', 'value4']])]
]);

In your template, you can utilize the `*ngFor` directive along with the keyvalue pipe to iterate over the map and access both the keys and the nested values:

Html

<div>
  <p><strong>Key:</strong> {{ entry.key }}</p>
  <p><strong>Nested Values:</strong></p>
  <ul>
    <li>
      <span>{{ nestedEntry.key }}:</span> {{ nestedEntry.value }}
    </li>
  </ul>
</div>

In this code snippet, we use the `*ngFor` directive to loop over each entry in the map, and the keyvalue pipe allows us to iterate over the map's key-value pairs effectively. By accessing `entry.key`, you can display the key itself, and by using `entry.value`, you can access the nested map.

Inside the nested loop, we iterate over the nested map using the same approach, accessing the nested key through `nestedEntry.key` and the corresponding value through `nestedEntry.value`. This nested iteration enables you to display the key-value pairs within the nested map.

By following these steps and leveraging the NgFor loop with the keyvalue pipe in Angular, you can efficiently iterate over a map with string keys and nested maps as values. This approach allows you to access and display the keys and nested values seamlessly within your Angular application, enhancing your data visualization and user experience.

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