如何访问数组内的变量

Question

So, I have been trying to solve this all of yesterday and today but cannot figure it out. I have the following returned in a variable called

var myRequest = req.body
console.log(myRequest) 

Produces the following:

{
    "methodcall": {
        "methodname": ["userLogin"],
        "params": [{
            "param": [{
                "value": [{
                    "string": ["test1"]
                }]
            }, {
                "value": [{
                    "string": ["password"]
                }]
            }]
        }]
    }
}

Now, I need to access the params key, and access the first param value so that whatever is returned in the first param value string is stored as username in a variable, and whatever is returned in param value string (the second one), is stored as a password.

So the final effect something like this:

var username = myRequest.methodcall.params.param...first value string
var password = myRequest.methodcall.params.param...second value string

However, I am really struggling to understand how to do this. Im guessing forEach loops would come in this, however I do not have experience with them so would appreciate some tips.

Also, when I try doing myRequest.methodcall , I keep getting undefined returned.

Any help will be greatly appreciated!

Answer 1

What you have posted is JSON. you need to set it up like:

var myRequest = JSON.parse(req.body)

this will allow you to access the it like a normal js object.

Answer 2

It sounds like your value is in JSON, parse it first and then you should presumably be able to get its values:

var myRequest = JSON.parse(req.body);

var userName = myRequest.methodcall.params[0].param[0].value[0].string[0];
var password = myRequest.methodcall.params[0].param[1].value[0].string[0];

Answer 3

Use . to access keys in object and [] to access index in array.

This code should work:

var username = myRequest.methodcall.params[0].param[0].value[0].string[0]

Answer 4

If you would like to use a loop at get the values test1 , password , and so on. You can use a loop and access the param array:

var params = myRequest.methodcall.params[0].param;

params.forEach(function(item){
    console.log(item.value[0].string[0]);
});

Fiddle

Answer 5

 //var myRequest = JSON.parse(req.body) // if JSON var myRequest = { "methodcall": { "methodname": ["userLogin"], "params": [{ "param": [{ "value": [{ "string": ["test1"] }] }, { "value": [{ "string": ["password"] }] }] }] } }; var params = myRequest.methodcall.params; var uname, pwd; for (var i = 0; i < params.length; i++) { console.log("uname is " + params[i].param[0].value[0].string); console.log("pwd is " + params[i].param[1].value[0].string) } 

Answer 6

if your response structure will be same then no need to go for loop or something, just directly access the username and password from response. try this.

var username = myRequest.methodcall.params[0].param[0].value[0].string[0];
var password = myRequest.methodcall.params[0].param[1].value[0].string[0];

Answer 7

Did you debug your code? I mean these code:

var username = myRequest.methodcall.params.param[0];
var password = myRequest.methodcall.params.param[1];