Im trying to access some data and keep getting errors no matter what I try. Please help.
"rain":{"3h":13.625} is the part of the JSON file I am trying to access.
Here is what I have tried:
var currentRain = data.rain.3h; Which is most logical as it worked before but the number is what is giving the error.
var currentRain = data.rain["3h"];
var currentRain = data.rain[0]["3h"];
var currentRain = data.rain["3h"][0];
UPDATE:
This is the JSON payload:
{ "base" : "stations",
"clouds" : { "all" : 92 },
"cod" : 200,
"coord" : { "lat" : -33.850000000000001,
"lon" : 151.22
},
"dt" : 1429558616,
"id" : 6619279,
"main" : { "grnd_level" : 1024.97,
"humidity" : 100,
"pressure" : 1024.97,
"sea_level" : 1031.0999999999999,
"temp" : 288.77699999999999,
"temp_max" : 288.77699999999999,
"temp_min" : 288.77699999999999
},
"name" : "City of Sydney",
"rain" : { "3h" : 13.625 },
"sys" : { "country" : "AU",
"message" : 0.0101,
"sunrise" : 1429474880,
"sunset" : 1429514809
},
"weather" : [ { "description" : "heavy intensity rain",
"icon" : "10n",
"id" : 502,
"main" : "Rain"
} ],
"wind" : { "deg" : 157.5,
"speed" : 8.3200000000000003
}
}
You'll need to use ["bracket notation"] to access this, since "3h" begins with a number. As MDN explains:
An object property name can be any valid JavaScript string, or anything that can be converted to a string, including the empty string. However, any property name that is not a valid JavaScript identifier (for example, a property name that has a space or a hyphen, or that starts with a number) can only be accessed using the square bracket notation.
This is the correct JSON:
{
"rain": {
"3h": 13.625
}
}
First you need to parse it and transform into an object:
var jsonToObject = JSON.parse('{"rain":{"3h":13.625}}');
You can now access it like this:
jsonToObject.rain["3h"]
Just use data["rain"]. If you need to parse it first do JSON.parse(data) and then data["rain"].
OUTPUT
console.log(data["rain"]);
> { '3h': 13.625 }
...keep in mind that will return an Object.
Related
I am new to javascript.
I would like to check whether the specific nested property is present or not in an array of items, ex)
[{
"_id" : ObjectId("5c4ec057e21b840001968d31"),
"status" : "ACTIVE",
"customerId" : "sample-book",
"bookInfo" : {
"bookChunks" : [
{
"key" : "Name",
"value" : "test"
},
{
"key" : "Surname1",
"value" : "testtt"
},
{
"key" : "user-contact",
"value" : "sample-value",
"ContactList" : {
"id" : "sample-id",
"timeStamp" : "Tue, 20 Sep 2016 07:49:25 +0000",
"contacts" : [
{
"id" : "contact-id1",
"name" : "Max Muller",
"phone_number" : "+XXXXXXX"
},
{
"id" : "contact-id2",
"name" : "Max Muller",
"phone_number" : "+XXXXXXX"
}
]
}
}
]
}
},
{
"_id" : ObjectId("5c4ec057e21b840001968d32"),
"status" : "ACTIVE",
"customerId" : "sample-book1",
"bookInfo" : {
"bookChunks" : [
{
"key" : "Name",
"value" : "test"
},
{
"key" : "Surname1",
"value" : "testtt"
}
]
}
}]
Here, I would like to find whether any item has ContactList or contacts present. If it is present take the item and put it in a separate list.
I am using ember-lodash. Using normal javascript or lodash would be fine for me. Any help will be really appreciated.
You could use filter and some. This returns all the objects which have at least one object with ContactList property inside bookInfo.bookChunks array.
const input=[{"_id":"5c4ec057e21b840001968d31","status":"ACTIVE","customerId":"sample-book","bookInfo":{"bookChunks":[{"key":"Name","value":"test"},{"key":"Surname1","value":"testtt"},{"key":"user-contact","value":"sample-value","ContactList":{"id":"sample-id","timeStamp":"Tue, 20 Sep 2016 07:49:25 +0000","contacts":[{"id":"contact-id1","name":"Max Muller","phone_number":"+XXXXXXX"},{"id":"contact-id2","name":"Max Muller","phone_number":"+XXXXXXX"}]}}]}},{"_id":"5c4ec057e21b840001968d32","status":"ACTIVE","customerId":"sample-book1","bookInfo":{"bookChunks":[{"key":"Name","value":"test"},{"key":"Surname1","value":"testtt"}]}}]
const output = input.filter(o =>
o.bookInfo.bookChunks.some(c => "ContactList" in c)
)
console.log(output)
If you just want to check if any of the objects have ContactList, you could replace filter with another some
(Note: This assumes that bookInfo.bookChunks will not be undefined. Otherwise you'd have to add a undefined check before using the nested property)
I'm having a JSON deserialized from Java as follow:
Java
jsonInString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(graphDTO);
JSON
"accounts" : [ {
"name" : "1009427721",
"value" : 16850.79,
"children" : [ {
"name" : "BITCOIN EARNINGS",
"value" : 10734.24,
"children" : [ {
"name" : "2017",
"value" : 1037.82,
"children" : [ {
"name" : "07",
"value" : 518.91
} ]
} ]
}, ...
The deserialized Java POJO being:
public class GraphDTO {
private Set<Account> accounts = new HashSet<>();
public Set<Account> getAccounts() {
return accounts;
}
}
Questions
How can I remove "accounts" from the generated JSON (first line) ?
Injecting the JSON form into JavaScript, I'm getting an encoded form like:
var data = { "accounts" : [ { ...
How can I avoid this ?
I don't think it's possible to avoid the accounts, but you can do this:
jsonInString = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(graphDTO.getAccounts());
We're waiting your way to parse JSON in javascript...
Got it work as follow:
Applying the answer of Mohicane:
mapper.writerWithDefaultPrettyPrinter().writeValueAsString(graphDTO.getAccounts())
Injecting the JSON from Java to JavaScript (in a JSP) with:
var data = ${graphDTOJSON};
Many thanks!
My collection looks like this:
> db.projects_columns.find()
{ "_id" : "5b28866a13311e44a82e4b8d", "checkbox" : true }
{ "_id" : "5b28866a13311e44a82e4b8e", "field" : "_id", "title" : "ID", "sortable" : true }
{ "_id" : "5b28866a13311e44a82e4b8f", "field" : "Project", "title" : "Project", "editable" : { "title" : "Project", "placeholder" : "Project" } }
{ "_id" : "5b28866a13311e44a82e4b90", "field" : "Owner", "title" : "Owner", "editable" : { "title" : "Owner", "placeholder" : "Owner" } }
{ "_id" : "5b28866a13311e44a82e4b91", "field" : "Name #1", "title" : "Name #1", "editable" : { "title" : "Name #1", "placeholder" : "Name #1" } }
{ "_id" : "5b28866a13311e44a82e4b92", "field" : "Name #2", "title" : "Name #2", "editable" : { "title" : "Name #2", "placeholder" : "Name #2" } }
{ "_id" : "5b28866a13311e44a82e4b93", "field" : "Status", "title" : "Status", "editable" : { "title" : "Status", "type" : "select", "source" : [ { "value" : "", "text" : "Not Selected" }, { "value" : "Not Started", "text" : "Not Started" }, { "value" : "WIP", "text" : "WIP" }, { "value" : "Completed", "text" : "Completed" } ], "display" : "function (value, sourceData) { var colors = { 0: 'Gray', 1: '#E67C73', 2: '#F6B86B', 3: '#57BB8A' }; var status_ele = $.grep(sourceData, function(ele){ return ele.value == value; }); $(this).text(status_ele[0].text).css('color', colors[value]); }", "showbuttons" : false } }
You can see that in the very last document that I have stored a function as text.Now the idea is that I will request this data and will be in an Javascript Array format.
But I want to be able to have my function without the quotes! You can see that simply evaluating it will not work because I need to have it still needs to be inside of the object ready to be executed when the array is used.
How can I achieve this?
Thanks for any help!
There are two possible solutions, but neither particularly safe and you should strongly consider why you need to store functions as strings in the first place. That being said, you could do two things.
The simplest is to use eval. To do so, you would have to first parse the object like normal, and then set the property that you want to the result of eval-ing the function string, like so:
// Pass in whatever JSON you want to parse
var myObject = JSON.parse(myJSONString);
// Converts the string to a function
myObject.display = eval("(" + myObject.display + ")");
// Call the function with whatever parameters you want
myObject.display(param1, param2);
The additional parentheses are to make sure that evaluation works correctly. Note, that this is not considered safe by Mozilla and there is an explicit recommendation not to use eval.
The second option is to use the Function constructor. To do so, you would need to restructure your data so that you store the parameters separately, so you could do something like this:
var myObject = JSON.parse(myJSONString);
// displayParam1 and displayParam2 are the stored names of your parameters for the function
myObject.display = Function(myObject.displayParam1, myObject.displayParam2, myObject.display)
This method definitely takes more modification, so if you want to use your existing structure, I recommend eval. However, again, make sure that this is absolutely necessary because both are considered unsafe since outside actors could basically inject code into your server.
I have a json object which has an array property 'partners' like below:
{
"_id" : ObjectId("578667b1bb14ca1c2773adaa"),
"customer" : null,
"created" : ISODate("2016-07-13T16:09:21.015+0000"),
"description" : "",
"subject" : "case 2",
"__v" : NumberInt(5),
"partners" : [
ObjectId("57857d93038aacd81ef3ad55"),
ObjectId("57857d93038aacd81ef3ad56")
]
}
I would like to check if an element already exists on the partner array using the following code:
_.includes(case_.partners, partner._id)
Just so u know I am using lodash for this but for some reason is not working and I have no clue why, anyone knows what is the problem here?
What I understanding, the partners sample you provided, is an javascript object, you should try to use primitive type value in the Json.
You can convert ObjectId to String by these way:
ObjectId("578667b1bb14ca1c2773adaa") + '';
or
ObjectId("578667b1bb14ca1c2773adaa").toHexString();
The Json object should be like this:
{
"_id" : "578667b1bb14ca1c2773adaa",
"customer" : null,
"created" : "2016-07-13T16:09:21.015+0000",
"description" : "",
"subject" : "case 2",
"__v" : 5,
"partners" : [
"57857d93038aacd81ef3ad55",
"57857d93038aacd81ef3ad56"
]}
So the solution will be , convert Javascript object into Json object, and then compare them.
This line in my JS file:
RedQueryBuilderFactory.create(config,
'SELECT "x0"."title", "x0"."priority" FROM "ticket" "x0" WHERE ("x0"."status" = (?))',
[]
);
works fine witih an empty array as the 3rd parameter. This parameter is supposed to be an array of strings according to the documentation and any sample code I can find. When I pass a string in the array it fails:
RedQueryBuilderFactory.create(config,
'SELECT "x0"."title", "x0"."priority" FROM "ticket" "x0" WHERE ("x0"."status" = (?))',
['in_process']
);
I get java.lang.ClassCastException in the Safari console. Here's the related part of the config if it's relevant:
var config = {
meta : {
tables : [ {
"name" : "ticket",
"label" : "Ticket",
"columns" : [ {
"name" : "title",
"label" : "Title",
"type" : "STRING",
"size" : 255
}, {
"name" : "priority",
"label" : "Priority",
"type" : "REF"
} ],
fks : []
} ],
types : [ {
"name" : "REF",
"editor" : "SELECT",
"operators" : [ {
"name" : "IN",
"label" : "any of",
"cardinality" : "MULTI"
}]
} ]
}
};
Looks like this is a bug in passing in parameter values. Internally it is expecting a collection but this is not happening.
Best if you raise a https://github.com/salk31/RedQueryBuilder bug report here?
NB Should be "IN" not "="