I'm working with a javascript function called create(tagName, options), where the options variable is in JSON format. Here's an example structure:
{id: 'test_id', class: 'test_class'}My question is about how to extract the 'id/class' part from this JSON object. Can someone please help me figure this out?
To access object properties in JavaScript, you have the option of using either dot notation or square bracket notation:
let car = {make: 'Honda', model: 'Civic'};
alert(car.make + ' ' + car.model);
Alternatively, you can use square bracket notation like this:
let car = {make: 'Honda', model: 'Civic'};
alert(car['make'] + ' ' + car['model']);
If you want to iterate through an object and get all keys, you can do so using a for...in loop:
let car = {make: 'Honda', model: 'Civic'};
for(key in car) {
alert(key);
}
Check out a live demonstration here: http://jsfiddle.net/2p2gw/5/
parameters.studentID
parameters.studentClass
Aside from the aforementioned instances, extracting properties can also be achieved using the object[...] notation:
options["id"]
options["class"]
Another important note regarding your JSON sample is to ensure keys are enclosed in quotes for strict validity:
{ "id": "test_id", "class": "test_class" }
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