I am trying to consume data from an API using REST call . I've succeeded to get data from the API .
I am having different rest call , I created different function for everyone .
I would like to know if I can store these data using JSon
it works perfect and gets all the Rest call but I would like to store them in JSon objects data to get it as a result in order to show it .
What I have done .
- I created a new object called Json
- I looped to consume data using REST call .
- but whenever I got this data , I have problems to store them .
var jsonObj = []; //declare object
$.each(data.results, function(i,item){ // on this line
jsonObj.push({id:item.conceptUuid ,
MedicalImage: item.dataURI ,
title: item.title ,
description: item.description ,
});
$htmlstring.append($('<li/>').append($('<img/>').attr('src',jsonObj.MedicalImage) ));
$htmlstring.append("<div class='title'> title: " + jsonObj.title
+ "<br> description : "+ jsonObj.description +
"</div>")
});
$('#result').html($htmlstring);
The function should take a query string as an argument, and the server returns data as JSON.
Can you show me an example how to do this using jQuery Storing data in JSON object to avoid multiple calls ?
JSON stands for "JavaScript Object Notation". It is a format designed for serialized network transport, not for runtime memory storage. Inside JavaScript a JSON object is simply an object. The "Object Notation" part describes the fact that even though JSON is transferred as a string over the network, it's structure can still be read — both by software and humans — as a regular, plain JS object.
In example, JSON.stringify({foo:'one', bar:'two'}) would return '{"foo":"one", "bar":"two"}', a string representation of the JavaScript object ready for HTTP transfer. Likewise, calling JSON.parse('{"foo":"one", "bar":"two"}') on receiving end would convert it back to the original object structure with datatypes intact. Read more about JSON here.
Other than this suspected misunderstanding of what JSON is and isn't, I'm not really sure what you mean by save. I take it you are haveing trouble reading the data and not getting anything on screen. This could be due to a number of things, primarily:
You might not be working with a de-serialized JSON string. In this case the data or data.results argument above might still be JSON, in which case you need to call JSON.parse(data) on it first in order to iterate over the properties of the data object.
You might be trying to use out-of-scope variables since you are dealing with already existing variables ($htmlstring) inside of the success callback. If so you should read up on the JavaScript scope model
If none of this helps, I recommend you open up the JavaScript console in your browser, run the code and check for error messages. If any, you should post them here to better your chances of a good answer.
Good luck!
Related
I am new to javascript and every time i try learning it, I just end up in an immense amount of frustration and disgust ! No offense, but this is my opinion or perhaps I am too stupid to not understand how it works at all.
I have a simple requirement. I have a pretty deeply nested dictionary (which is what it is called in many backend languages) at hand. To be more specific it is the raw text of a postman collection. The collection itself could have multiple nested directories.
Now all I want to do is to be able to parse this dictionary and do something with it recursively.
For example, if I had to do the same in python I would do it as simply as :
def createRequests(self, dic):
total_reqs = 0
headers = {}
print type(dic)
keys = dic.keys()
if 'item' in keys:
print "Folder Found. Checking for Indivisual request inside current folder . . \n"
self.item_list = dic.get('item')
for each_item in self.item_list:
self.folder.append(self.createRequests(each_item))
else:
print "Found Indivisual request. Appending. . . \n"
temp_list = []
temp_list.append(dic)
self.requestList.append(temp_list)
return self.requestList
where dic would be my dictionary that I want to parse.
Is there any simple and straight forward way to do the same in Javascript?
Let's just say all I want to do is that if I have a text file that has properly formed json data in it and whose contents have been read into dataReadFromFile and then it has been converted into a JSON as :
var obj = JSON.parse(dataReadFromFile);
is there any simple and easy way to convert this JSON to dictionary or the dataReadFromFile directly into a dictionary such that I can say something like dictioanry.keys() if I wanted a list of the keys in it.
Note that the content of the file is not fixed. It may have multiple levels of nesting, which may not be known beforehand.
I have an AJAX call that get's a simple JSON back on success, writing the returned JSON into the variable named data.
The returned JSON has been generated within PHP through:
echo json_encode(array('message'=>0);.
Back in my javascript console I'm logging the output of data with console.log(data);. The output is {"message":0}, which seems correct.
However, if I try to log console.log(data.message); I am getting message: undefined.
What am I doing wrong in accessing this pretty basic JSON object?
I've been reading some articles about how to move through JSON object, e.g. https://www.tutorialspoint.com/json/json_overview.htm but I can't find my mistake.
Hopefully you can point me into the right direction :)
Thank you :)
You have to do JSON.parse(result) first to make it an object, because at the moment you're trying to access message property of a string.
You know there are 2 JSON functions in javascript, right...?
// returns string representation of the object
JSON.stringify(object);
// returns a new object built from the string
JSON.parse(object_stringified);
I have four textboxes which contain json string which I create by calling json.stringify on various js objects..
eg. '["users.name","users.username"]' (This is the value of one textbox)
What I want to do is create a single json string from these four json strings and send them to the backend using POST..
So I create a object and add them like this
tmp = {}
tmp["columns"] = $("#sc").val();
/*adding more data....*/
$.ajax("/api/backend", {
data: JSON.stringify(tmp),
/* more ajax code...*/
});
The data that gets sent is of the following format..
{"columns":"[\"users.name\",\"users.username\"]"}
This is not a string but a json object...
Now when I do the following..
tmp1= JSON.stringify(tmp)
and Post using..
$.ajax("/api/backend", {
data: JSON.stringify(tmp1),
/*more code below..*/
The data that gets sent is of the following format and is string..
"{\"columns\":\"[\\\"users.name\\\",\\\"users.username\\\"]\"}"
This string has a lot of '\' characters which needs to be taken into account in the backend.
Is this the right way of handling my problem or am I doing something wrong?
Thanks
It depends on what you are trying to achieve.
If you want to send to the server a JSON that combines all JSON in your inputs, you'd better parse the JSON in your inputs, prior to adding them to you tmp object. That way, you get an object containing objects, rather than an object containing JSON strings.
Retrieving JSON from inputs would be like this:
tmp["columns"] = JSON.parse($("#sc").val());
See that you are storing objects within your tmp object, rather than JSON strings. Then, you can just send that object as JSON to your server.
Thus, your server would receive this:
"{\"columns\":\"[\"users.name\",\"users.username\"]\"}"
Which, I believe, looks much better. I hope that helps.
what i am doing is:
1. Get values from ajax response(which is in json format) for listing rows of data which
response = {"categories":[{"name":"General","id":"6305","pop":"show when clicked"},{"name":"Navigation","id":"6043","pop":"show when clicked"},{"name":"New","id":"6051","pop":"show when clicked"},{"name":"Time","id":"6117","pop":"show when clicked"},{"name":"Reesh","id":"6207","pop":"show when clicked"}]}
2 . I will parse the json and store in a object like this
ex:
object= {6305:{"name":"General","id":"6305","pop":"show when clicked"},
6043:{"name":"Navigation","id":"6043","pop":"show when clicked"},
6051:{"name":"New","id":"6051","pop":"show when clicked"},
6117:{"name":"Time","id":"6117","pop":"show when clicked"},
6207:{"name":"Reesh","id":"6207","pop":"show when clicked"}};
why i am doing this is because i can get the data using the id
ex: object[6305] will give me the data.
3 .So that i can retrieve the data and also make changes to values in the object using the id when changes occur in db.
ex: object[6350].pop="changed";
Please tell me:
-->whether is this the correct method or i can do it in a much simpler or efficient way?
-->whether i can store the json response as it is and parse data as it is? if so please explain with example.
Yes, of course you would not need to build the object:
function getObject(id) {
for (var i=0; i<response.categories.length; i++)
if (response.categories[i].id == id)
return response.categories[i];
return null;
}
However, if you often need to access objects by their ids this function would be slow. Creating the lookup table as you did will not create much memory overhead, but make retrieving data much faster.
BTW: Your title question "save data as object or json" is confusing. Serializing manipulated objects back to JSON makes no sense, as you always will use the parsed objects. Of course, if you just needed to manipulate a JSON string, and knew exactly what to do, (simple) string manipulation could be faster than parsing, manipulating and stringifying.
IN my web service,I return one json object in the method:
{name:'xx'}
I use the ajax to send the request,then parse them using the 'eval'
onComplete:function(req){
var data=eval(req.responseText);
//do something according data
}
However,I can not get the 'data'.
When I retrun the following string:
[{name:'xx'}]
It worked,and I get the 'data' as an array.
Through google,I know that it is caused by the '{' in the return string.
So I wonder if there is no way to retrun a json object ?
Use JSON.parse or jquery's $.parseJSON - if you use jquery - instead of eval.
Also, if you do use jquery, you can take advantage of the built-in ajax method that automaticly retrieves and parses the response as a json object : $.getJson.
If you still don't want to modify your "logic", you can try to eval your response with added brackets : var data = eval('(' + req.responseText + ')');
Have a read of this blog post on JSON hijacking. The author explains the issue your running into
You might have seen code like the following when related to JSON:
eval('('+JSON_DATA+')');
Notice the beginning and ending parenthesis, this is to force
JavaScript to execute the data as an object not a block statement
mentioned above. If JavaScript did attempt to execute JSON data
without the parenthesis and the JSON data did in fact begin with “{”
then a syntax error would occur because the block statement would be
invalid.
...more info on why...
Rather than adding () around your JSON response, you should be using JSON.parse or $.parseJSON like gion_13 has said. Eval isn't the way to go.
Also, like quentin said in the comments, you need to change the JSON you're returning as it's invalid. You need to quote your key as well as your value.
It worked,and I get the 'data' as an array.
That's what it's supposed to do. [] is the syntax for declaring an array. If you want the inner object, then just return {name: 'XX'}.