What is the clarification on AngularJs' ng-options?

In my demo, I have a small setup.

Essentially, it consists of a select element with the following data:

 address: {
            select: {
                code: "0",
                name: "Select proof of address"
            },
            letter: {
                code: "1",
                name: "Letter"
            },
            photograph: {
                code: "2",
                name: "Photograph"
            }
        }

Here is how the select looks like:

 <select ng-model="current.addressCode" ng-options="value.code as value.name for (key,value) in student.address"</select>

Questions:

Question #1 - Reviewing the Ng documentation -

So, I attempt to compare

value.code as value.name for (key,value) in student.address

with the second line (which seems most suitable)

select as label for (key , value) in object

What does this mean?

value.code maps to select ???

An HTML select element has an option tag with attributes value and inner text like this:

<option value="volvo">Volvo</option>
that's all.

What interpretation should be made from the documentation?

Question #2

How can I connect this object of mine to a regular and comprehensible value,text select?

(I desire the code to represent the value and the name to serve as the text)

At present, there doesn't appear to be any value visible in the DOM:

Answer №1

Your understanding is correct that example two meets your requirements, which is as follows:

select as label for (key , value) in object

As per the documentation states:

select: The result of this expression will be bound to the model of the 
        parent <select> element. If not specified, select expression will
        default to value.

Therefore, for your particular scenario, your current code for the select tag is properly structured:

<select ng-model="current.addressCode" ng-options="value.code as value.name for
        (key,value) in student.address"></select>

value.code value is saved in current.addressCode, while in the select dropdown, you will see value.name as the options label.

UPDATE: To address your queries:
Query 1
In this instance, "select" serves as a variable name - essentially a placeholder used in the documentation to elaborate on it further below. In your code, the actual value of the variable utilized instead of select is what will be bound to the ng-model of the select element (In your case, value.code)

Query 2
Exactly as you have indicated:

<select ng-model="current.addressCode" ng-options="value.code as value.name for
            (key,value) in student.address"></select>

This setup will automatically provide you with the required value and text within the select tag. Upon selecting an option, the associated value.code will be stored in current.addressCode

Answer №2

Visit this link for more details

Consider the following modification:

This can be achieved with a simple adjustment:

 address: [
            {
                code: "0",
                name: "Choose proof of address"
            },
            {
                code: "1",
                name: "Letter"
            },
            {
                code: "2",
                name: "Photograph"
            }
        ]

The issue arises when your Key matches the nested Name (e.g., letter - Letter), making the JSON data redundant.

Therefore, you will observe:

The value represented as code, with the corresponding text being the name.

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