Utilize Angular2 to automatically fill dynamic forms with default data retrieved from an API

After spending a few weeks working with Angular 2, I am currently tackling the task of creating dynamic forms for a system settings page. The objective is to have the API return multiple forms, construct these forms within tabs, incorporate various types of input fields, and then prefill these forms with default or previously saved data for users to modify and save.

So far, I have successfully managed to create multiple forms with an arbitrary number of input fields. However, I am now facing a new challenge – populating these forms with data obtained from separate API calls. The first call generates the form structure while the second one provides the data required to populate each field.

The issue lies in dynamically binding this data to specific forms without using the typical ng-model approach. To further clarify, my workflow involves receiving information about the form names and quantities through an initial API call. Subsequently, another API call supplies the layout details for each form. After successfully building all forms, a third API call furnishes the necessary configuration data for each form, which needs to be appropriately linked.

Answer №1

It seems that the information you need to populate your form group is coming from the third API call based on your question. The values you receive from this API should match the ones required for the form group previously created using data from the second API call.

To achieve this, you will need to iterate through the results of the third API call and assign the values to the form group that should already be set up.

Assuming you are familiar with looping in JavaScript/Typescript, you can proceed accordingly.

If there is a specific identifier in the data from the third API call that corresponds to the form control it relates to, use it to link the values. In this case, I will use item.key as the linking token for demonstration purposes.

Below is a pseudo code snippet illustrating how you can approach this task:

for each item.key 
  this.form.controls[item.key].value = item.value;

In this code, this.form references the existing form within your component. Utilize the controls property along with an indexing value (

item.key</code) to manipulate the <code>value
of each respective control.

If there isn't a clear connection between the form group and the data obtained from the third API call, binding them together may pose challenges. If additional information beyond just a key is available (such as a description), you could combine these details for linkage purposes.

I hope these insights prove helpful to you!

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