It sounds a lot more complicated than it really is.
So in Perl, you can do something like this:
foreach my $var (#vars) {
$hash_table{$var->{'id'}} = $var->{'data'};
}
I have a JSON object and I want to do the same thing, but with a javascript associative array in jQuery.
I've tried the following:
hash_table = new Array();
$.each(data.results), function(name, result) {
hash_table[result.(name).extra_info.a] = result.(name).some_dataset;
});
Where data is a JSON object gotten from a $.getJSON call. It looks more or less like this (my JSON syntax may be a little off, sorry):
{
results:{
datasets_a:{
dataset_one:{
data:{
//stuff
}
extra_info:{
//stuff
}
}
dataset_two:{
...
}
...
}
datasets_b:{
...
}
}
}
But every time I do this, firebug throws the following error:
"XML filter is applied to non-xml data"
I think you can use the JSON response as an associative array. So you should be able to go directly in and use the JSON.
Assuming you received the above example:
$('result').innerHTML = data['results']['dataset_a']['dataset_two']['data'];
// Or the shorter form:
$('result').innerHTML = data.results.dataset_a.dataset_two.data;
Understand that I haven't tested this, but it's safer to use the square brackets with a variable than it is to use parenthesis plus the name with the dot accessor.
Your example is failing because of some convoluted logic I just caught.
$.each(data.results), function(name, result) {
hash_table[result.(name).extra_info.a] = result.(name).some_dataset;
});
Now, the foreach loop goes through the variable data.results to find the internal elements at a depth of 1. The item it finds is given to the lambda with the key of the item. AKA, the first result will be name = "datasets_a" item = object. Following me so far? Now you access the returned hash, the object in item, as though it has the child key in name ... "datasets_a". But wait, this is the object!
If all else fails... write your result JSON into a text field dynamically and ensure it is formatted properly.
Why would you want to change an array into another array ?-)
-- why not simply access the data, if you want to simplify or filter, you can traverse the arrays of the object directly !-)
This works. Just dump it into a script block to test.
d = {
'results':{
'datasets_a':{
'dataset_one':{
'data':{
'sample':'hello'
},
'extra_info':{
//stuff
}
},
'dataset_two':{
///
}
///
},
'datasets_b':{
///
}
}
}
alert(d.results.datasets_a.dataset_one.data.sample)
I hope this pasted in correctly. This editor doesn't like my line breaks in code.
d = {
'results':{
'datasets_a':{
'dataset_one':{
'data':{
'sample':'hello'
},
'extra_info':{
//stuff
}
},
'dataset_two':{
///
}
///
},
'datasets_b':{
///
}
}
};
alert(d.results.datasets_a.dataset_one.data.sample)
Related
Using Cordova, I am trying to get an Object to add to an array. I have this working on node JS using :
theData = {[varkey]:DataObject};
But I can't get this to work the same way within my javascript that cordova runs.
I need to do the following:
var TownName = 'Auckland', var townData = (JSON Data);
theArray = new Array();
theArray[TownName] = townData;
I need to be able to call it back as:
theArray['Auckland']
Which will return (JSON Data)
But it doesn't want to store the data with the key inside the array.
I have also tried:
theArray.TownName = townData;
theArray = [{TownName:townData}];
theArray = {[TownName]:townData}];
Nothing wants to store the data.
Any suggestions?
::EDIT::
data.theData =
"Auckland"[
{
"username":"pndemoname1",
"number":"373456",
"www":"http://373456.pndemoname1",
"icon":"/imgs/pndemoname1.png"
},
{
"username":"pndemoname2",
"number":"373458",
"www":"http://373458.pndemoname2",
"icon":"/imgs/pndemoname2.png"
}
data.town = "Auckland";
townData = new Array();
alert(JSON.stringify(data.theData))//Alerts theData
townData[data.town] = data.theData
alert(townData[townName]) //Alerts undefined
::EDIT2::
Re-defining the array within the function that deals with all of the data, seems to make it work.
As per my answer, the issue was that I assumed javascript vars are global.
Use objects or an array of objects.
A data structure like this:
{
town1: town1Data,
town2: town2Data,
}
Or more common:
[
{
name: "Town 1",
data: {...}
},
{
name: "Town 2",
data: {...}
},
]
For reference:
http://andrewdupont.net/2006/05/18/javascript-associative-arrays-considered-harmful/
I got what you're trying to do, to add property names dynamically to your object is first, by making sure you are using an OBJECT instead of an array, so when you want to store something you will do the following:
var _obj = {}, _something = 'xyz';
_obj[ _something ] = { ... }; // json structure
The problem you're facing is that you want to assign a string value as a key inside your array, which will not work.
However, you can still use the array you defined and do the following:
var _array = new array();
_array.push( { .... } ); // insert json structure
Remember! By using the array you will have to loop through all values every time you want to access your key, just as the best practice to avoid getting into errors.
Good luck.
The issue was that I didn't define the array within the function of where I was trying to add the information to.
I assumed the var was global (Too much PHP)
I'm having a problem getting an array of information stored properly as JSON.
I made a fiddle to illustrate the problem. Enter a set of tags and take a look at the console to see the output.
More explanation:
So I have an input that takes in a comma-separated list of tags, which I then format.
function createTagArray() {
// given an input value of 'tag1, tag2, tag3'
// returns array = ['tag1', 'tag2', 'tag3']
}
I thought what I needed to do next was the following:
loop over the array and create a 'tag' object for each item which also includes an id for the tag and the id of the contact the tag is associated with.
Each object is pushed to tags, an observable array.
function single_tag(id, contactId, tagLabel) {
var self = this;
self.id = id;
self.contactId = contactId;
self.tagLabel = tagLabel;
}
function createTags() {
var array = createTagArray();
for (var i = 0; i < array.length; i++) {
self.tags().push(new single_tag(uuid.generate(), self.contactId, array[i]));
}
}
Then, I converted it into JSON
self.contactInformation = function() {
return ko.toJS({
"id": self.contactId,
"firstname": self.firstname(),
"lastname": self.lastname(),
... other fields ...
"tags": self.tags(),
})
}
But, when I inspect the console output of calling this function, tags is a collection of arrays, not a nice json object.
How do I get it formatted correctly?
I tried this suggestion, and the tag json is structured correctly, but it is stored with escaped quotes, so that seems wrong.
Thanks for all the help!
I would recommend you knockout.mapping plugin for KO, it allow map complicated JSON structure to view model, even without declarations.
From the documentation
Let’s say you have a JavaScript object that looks like this:
var data = {
name: 'Scot',
children: [
{ id : 1, name : 'Alicw' }
]
}
You can map this to a view model without any problems:
var viewModel = ko.mapping.fromJS(data);
Now, let’s say the data is updated to be without any typos:
var data = {
name: 'Scott',
children: [
{ id : 1, name : 'Alice' }
]
}
Two things have happened here: name was changed from Scot to Scott and children[0].name was changed from Alicw to the typo-free Alice. You can update viewModel based on this new data:
ko.mapping.fromJS(data, viewModel);
And name would have changed as expected. However, in the children array, the child (Alicw) would have been completely removed and a new one (Alice) added. This is not completely what you would have expected. Instead, you would have expected that only the name property of the child was updated from Alicw to Alice, not that the entire child was replaced!
...
To solve this, you can specify which key the mapping plugin should use to determine if an object is new or old. You would set it up like this:
var mapping = {
'children': {
key: function(data) {
return ko.utils.unwrapObservable(data.id);
}
}
}
var viewModel = ko.mapping.fromJS(data, mapping);
In the jsfiddle you were using Knockout 3.0 which doesn't have support for textInput. This was added in 3.2. To use version 3.2 you need to use a cdn such as this: http://cdnjs.com/libraries/knockout
There was typeo in your binding. sumbit should be submit.
There was a problem with your constructor for single_tag. id was not used so I removed it:
function single_tag(contactId, tagLabel) {
var self = this;
self.contactId = contactId;
self.tagLabel = tagLabel;
}
Currently also contactId is not set because the observable has not been set to a value.
To convert to JSON you need to use ko.toJSON instead of ko.toJS:
self.contactInformation = function() {
return ko.toJSON({
"firstname": self.firstname(),
"tags": self.tags(),
})
}
Now when the console writes out an array appears:
{
"firstname":"test",
"tags":[
{"tagLabel":"test1"},
{"tagLabel":"test2"},
{"tagLabel":"test3"}
]
}
JsFiddle
So my problem was more basic than I was realizing. I'm using JSON Server to serve up my data, and I was pulling information from two parts of the database (contacts & tags).
When I tried to update my tags, I was trying to apply them to a property that didn't exist on the contact JSON in my database. Posting the tags separately worked though.
please i have this output from my json web service:
{"format":"json",
"success":true,
"errors":[],
"result":
{"**206**":
{"player_name":"stagiaire",
"M":{
"6480":{"score":0,"answer":"cdgvbdbgd","category_name":"cdgvbdbgd"},
"6481":{"score":0,"answer":"cdgvbdbgd","category_name":"cdgvbdbgd"},
"6482":{"score":0,"answer":"cdgvbdbgd","category_name":"cdgvbdbgd"},
"6483":{"score":0,"answer":"cdgvbdbgd","category_name":"cdgvbdbgd"},
},
"O":{
..... },
}
}
}
What i want is to extract the value (which is now 206 but it can be another number).
I am asking for your help to achieve this goal.
Any help will be appreciated.
In case the resulting object contains only a single property with this number as its name, i.e.
result = {
206 : {
...
}
// no other properties here
}
then you can use something like:
var num = Object.keys(result).shift(); // "206"
Check the browser compatibility for Object.keys() method at MDN and use shim if needed.
If the object you look for always has a player name as value, try
for (var key in obj.result) if obj.result[key]["player_name") alert(key)
Or use jQuery
$.each(data.result,function(key,val) {
alert(key);
});
I have some JSON which I have in a object but I can seem to return the values a sample of the json is as follows.
{
"rootLayout":"main",
"layoutDescriptions":[
{
"id":"main",
"container" : {
"type":"Tabs",
"content":[
{
"type":"Panel",
"label":"Simple Address",
"layout":"SimpleForm",
"comment":"This form is simple name value pairs",
"content":[
{ "type":"label", "constraint":"newline", "text":"Org Name" },
{ "type":"text", "property":"propOne" },
{ "type":"label", "constraint":"newline", "text":"Address" },
{ "type":"text", "property":"addrLine1" },
{ "type":"text", "property":"addrLine2" },
{ "type":"text", "property":"addrLine3" },
{ "type":"label", "constraint":"newline", "text":"Postcode" },
{ "type":"text", "property":"postcode" }
]
},
I am trying to return the rootLayout using
obj[0].rootLayout.id
This doesn't work also I am wondering how to access the content elements.
I am new to json and I have been thrown in the deep end I think. I cannot find any good reading on the internet can anyone recommend some.
Thanks.
Some explanation because you don't seem to understand JSON
It's not as complicated as one may think. It actually represents javascript objects as if they'd be written by code.
So if you have JSON written as:
{
id : 100,
name: "Yeah baby"
}
This means that your object has two properties: id and name. The first one is numeric and the second one is string.
In your example you can see that your object has two properties: rootLayout and layoutDescriptions. The first one jsonObj.rootLayout is string and will return "main" and the second one is an array:
layoutDescriptions: [ {...}, {...},... ]
Apparently an array of objects because array elements are enclosed in curly braces. This particular array element object that you provided in your example has its own properties just like I've explained for the top level object: id (string), container (another object because it's again enclosed in curlies) etc...
I hope you understand JSON notation a bit more.
So let's go to your question then
You can get to id by accessing it via:
jsonObj.layoutDescriptions[0].id
and further getting to your content objects:
var contentObjects = jsonObj.layoutDescriptions[0].container.content[0].content;
for(var i = 0; i < contentObjects.length, i++)
{
// assign this inner object to a variable for simpler property access
var contObj = contentObjects[i];
// do with this object whatever you need to and access properties as
// contObj.type
// contObj.property
// contObj.text
// contObj.constraint
}
Mind that this will only enumerate first content object's content objects... If this makes sense... Well look at your JSON object and you'll see that you have nested content array of objects.
The object is an object, not an array, and it doesn't have a property called 0.
To get rootLayout:
obj.rootLayout
However, rootLayout is a string, not an object. It doesn't have an id. The first item in the layoutDescriptions array does.
obj.layoutDescriptions[0].id
Are you trying to get one of layoutDescriptions with id equals to obj.rootLayout?
var targetLayout = {};
for(var i = 0; i < obj.layoutDescriptions.length; i++) {
if(obj.layoutDescriptions[i].id == obj.rootLayout) {
targetLayout = obj.layoutDescriptions[i]; break;
}
}
console.log(targetLayout);
I get the following error in IE8:
length is null or not an object
Anyone have any ideas? Feedback greatly appreciated.
function refresh() {
$.getJSON(files+"handler.php?action=view&load=update&time="+lastTimeInterval+"&username="+username+"&topic_id="+topic_id+"&t=" + (new Date()), function(json) {
if(json.length) {
for(i=0; i < json.length; i++) {
$('#list').prepend(prepare(json[i]));
$('#list-' + count).fadeIn(1500);
}
var j = i-1;
lastTimeInterval = json[j].timestamp;
}
});
}
Just check for the object being null or empty:
if (json && json.length) {
// ...
}
C'mon gang this was glaringly obvious :-)
JSON objects (returned by jQuery or otherwise) do not have a length property. You'll need to iterate over the properties, most likely, or know the structure and simply pull out what you want:
$.getJSON( ..., ..., function( json ) {
for( var prop in json ) {
if( !json.hasOwnProperty( prop ) ) { return; }
alert( prop + " : " + json[prop] );
}
} );
Alternatively, grab a library like json2 and you'll be able to stringify the object for output/debugging.
pop the JSON in a span then clip it and paste it here so we can see it:
<span id="JSObject2">empty</span>
with the json2.js from here: (link for it at bottom of the page) http://www.json.org/js.html
myJSON = JSON.stringify(json);
$('#JSObject2').text(myJSON);
Using that, we can help you better, and you can see what you have!
What does your returned JSON look like? If you're returning an object, length might not be explicitly defined, whereas if you're returning an array, it should be defined automatically.
First thing that comes to mind is that length is not a property of whatever json is. What is the json variable supposed to be anyway?
A JSON is an object, you seem to be treating it like an array. Does it really have a length property? Show us the JSON?
You might need to use a for..in instead.
EDIT: Can you make the JSON from the backend structure like so?
({
"foo": []
})