I am working with an object msg.data that contains the following information:
{
"user_id": 1,
"success": "true"
}
Now, I want to add a name field to this list:
{
"user_id": 1,
"success": "true",
"name" : "giri"
}
I have attempted the following code:
msg.data.name = "giri";
However, no matter what I try, the output when printing msg.data remains unchanged.
If anyone has insight on how to properly accomplish this task, I would greatly appreciate it.
Depending on the type of msg.data, adding new members can be done in different ways. If it is an object, simply use the dot notation to add a new property like this:
msg.data.name = "haseeb";
If msg.data is a JSON string, you will first need to parse it into an object before adding a property using the dot notation:
var myobject = JSON.parse(msg.data);
myobject.name = "haseeb";
After testing it out myself in the console, I can confirm that this code snippet actually works:
message = {};
message.data = {
"user_id": 1,
"success": "true"
};
message.data.name = "giri";
message; // When executed in the console, this will display the variable. Otherwise, use console.log(message) to show the contents.
Make sure there are no typos and nothing else is altering the object. Run a console.dir before and after your statement to verify. Keep in mind that the console might show the wrong object at the time (if using console.log) because it reflects the current object reference (which could change). For more details on this behavior, you can visit this post.
When utilizing
msg = {}; or msg.data = {}, it functions as an object
Allowing you to dynamically add any variable
msg.firstvar=""
msg.Secondvar=""
msg.Thirdvar=""
msg.data.firstvar=""
msg.data.Secondvar=""
msg.data.Thirdvar=""
Here is an easy method to achieve this:
Let's say the variable is a dynamic object created as a response from an ajax request.
var data = {
"user_id" : 1,
"success" : true
};
if (data.name == undefined ) {
Object.defineProperty(data, 'name', {
value : 'john',
writable : false, // set to true if you want the value to be changeable
enumerable : true // set to true if you want the property to be iterated over
});
}
For more information, check out Object Define Property
Whenever I try to display msg.data, the initial result is always returned.
This indicates that msg.data may not be defined and could potentially be "undefined".
To investigate further, utilize a debugger tool or log the contents of msg in the console.
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