Here is what im doing:
onClick, grab details immediate subnodes and publish it on html. Status = DONE // This works well
NOW, I am using a bunch of arrays to get this done.
node.eachSubnode(function(node) {
title[title.length] = node.name; // This is what i want to modify
data[data.length] = node.data; // This is what i want to modify
});
Here is how they look currently:
title = ['Coffee', 'Tea'];
data = ["Americans", "Britishers"]; // i use a loop to iterate through these arrays and append to html.
Here is what i want it to be:
var preference = {
title: 'Coffee',
data: 'Americans'
},
{
title: 'Tea',
data: 'Americans
}
I want to create this using the node.eachSubnode loop.
I'm not sure if I understood correctly, but I think this is what you want:
var preferences = [];
node.eachSubnode(function(node) {
preferences.push({
title: node.name,
data: node.data.germ
});
});
You cannot create an object that looks exactly like that, I think you need an array with objects. Assuming your node is an array with the length property, this method is the fastest.
var preference = new Array(node.length||0), i = 0;
node.eachSubnode(function(node) {
preference[i++] = {
title: node.name,
data: node.data.germ
};
});
Related
This is my array:
var country = ["US(+1)","IND(+91)"];
And i want to convert my array in this below format:
country = [
{
title: "US(+1)",
},
{
title: "IND(+91)",
}
]
word title should be same for each array value.
with this code am trying to get my expected result as above
var obj = country.reduce(function(o, val) { o['title'][] = val; return o; }, {});
But my output is comes like this as below: only last index is taking place
{"title":"IND(+91)"} this is wrong output which i dont want
You may be able to do it with reduce but it's much easier to use map:
var country = ["US(+1)","IND(+91)"];
var obj = country.map(function(c){return {title:c}});
console.log("country:", country);
console.log("obj:", obj);
map is for when you want to turn an array of things into another array of things, and reduce is when you want to turn an array of things into just a single thing.
var country = ["US(+1)","IND(+91)"];
I would use a more descriptive word since it is a list of countries.
var countries = ["US(+1)","IND(+91)"];
But to answer your question, to manipulate an array into a new array, I like to use the array.map method:
var objects = countries.map(function(country){ return { title: country } });
Here is the documentation for map:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map?v=control
I am trying to take some some objects from an original object into an array variable.
console.log("news len", news["articles"].length); // this comes out to 9
for(var a in news["articles"]) {
var results = [];
results.push({
title:news["articles"][a]["title"],
subtitle: news["articles"][a]["description"],
item_url:news["articles"][a]["title"],
image_url:news["articles"][a]["urlToImage"],
});
}
console.log("results len",results.length); //only contains one entry
Is there another way to accomplish this, and if not what am I doing wrong?
Using Node js if that helps any.
You could use map directly and return an object in the callback for a new array
var results = news.articles.map(function (a) {
return {
title: a.title,
subtitle: a.description,
item_url: a.title,
image_url: a.urlToImage
};
};
The main problem is that each iteration of your loop re-sets results to an empty array:
var results=[];
If you move that statement before your loop, you will get something closer to what you want.
That said, it looks like news["articles"] already is an array, so you can probably just use Array.prototype.map?
var results = [];
news["articles"].map(function(val,idx){
results.push({
title: val["title"],
//etc
}
});
Im trying to create a structure with Javascript as follows:
var users = {
user.id: {
session.id1: session.id1,
session.id2: session.id2,
session.id3: session.id3
},
user.id2: {
session.id1: session.id1,
session.id2: session.id2,
session.id3: session.id3
},
};
What i need: add new sessions and remove them, removing okay, but how should i define object and how can i push new sessions to user obejct? That's why key is equal to value.
If you want to use session.id1 instead of something like sessionId1 :
Assign value:
users['user.id'].['session.id1'] = value;
Create object:
var users = {
'user.id': {
'session.id1': session.id1,
'session.id2': session.id2,
'session.id3': session.id3
},
'user.id2': {
'session.id1': session.id1,
'session.id2': session.id2,
'session.id3': session.id3
},
};
But I don't recommend it. If you are the only one who is gonna work with this code, it's ok.
You can first create an empty object and fill it as and when the data comes like
users[user.id] = {};
For an example:
var users = {};
var user = {id : 1}; //Data received(Just an example)
users[user.id] = {};
var session = {id1 : 1.1}; //Data received
users[user.id][session.id1] = session.id1;
console.log(JSON.stringify(users));
How about refactoring the user object to store sessions as an array and push, pop and slice them as required.
var users = [
{
id:'userid',
sessions: [
{
id: 'sessionid',
sessiondata: something
},
{
id: 'sessionid',
sessiondata: something
}
]
}];
This way to can just use normal array operators on the session array for each user.
I have following array of objects
var ppl = [
{
name: "John",
content: "<p>description</p>"
},
{
name: "Mike",
content: "<p>Desc</p>"
},
{
name: "Steve",
content: "html"
},
{
name: "Michael",
content: "<p>description</p>"
}
];
What I am doing is to display above array. Then when user clicks on name return his content. Like following
$('a.ppl').on('click', function (e) {
e.preventDefault();
var text = $(this).text();
var content = _.find(ppl, function (desc) { if (desc.name === text) return desc.content; });
console.log(content);
});
What above code does is it finds the content of the person clicked however it returns the entire object of that person e.g. when John is clicked the his entire object {
name: "John",
content: "<p>description</p>"
} is returned by the _.find() function. I just need the content. How can I return content only?
If I were you I would simply do a loop:
var length = ppl.length;
var findcat = function(){
for (var a = 0; a < length; a++) { if(ppl[a].name==text){return ppl[a].content} };
}
var content = findcat();
rather than using underscore.js .
Or if you really want to use underscore.js, change it to this:
var content = _.find(ppl, function (desc) { if (desc.name === text) return desc; });
content = content.content;
and it will work.
Updates (regarding HTML strings in json):
It is okay to store them in json as these HTML strings will simply be considered as normal strings data (just don't forget to escape characters like quotation and forward slash). When real HTML elements are being created from these strings (using jquery functions like .html(string), append(string) ), the browser will need to render these new contents and it may cause a slow performance comparing to leaving all the page-rendering at the start for the browser, but the difference will be pretty subtle. So in terms of performance, it is always okay to have them in json. But in terms of security, you should be careful when there were HTML markup in your data because you are making XSS easier to be accomplished. (Here is a wikipedia article that provides more details on XSS, also known as Cross-site scripting.)
I don't think you need an array here. A simpler and more efficient way would be to use names as properties.
var ppl = {"John": "<p>description</p>", "Mike": "<p>Desc</p>" };
$('a.ppl').on('click', function (e) {
e.preventDefault();
var text = $(this).text();
console.log(ppl[text]);
});
This is the expected Behavior of find operator which returns whole found item ! , why dont use content.content
the _.find looks through each value in the list, returning the first one that passes a truth test, when you return desc.content, it is evalued to true, so the desc object is return. so you can't return inside the find. but you can just access the content as desc.content. here is jsfiddle code:
$('a.ppl').on('click', function (e) {
e.preventDefault();
var text = $(this).text();
var desc = _.find(ppl, function (desc) {
return desc.name === text;
});
console.log(desc.content);
});
Here's how I'm initializing and building an array:
var newCountyInfo = new Object();
newCountyInfo.name = newCountyName;
newCountyInfo.state = newCountyState;
newCountyInfo.zips = newCountyZips;
newCountyInfo.branchID = newCountyBranchID;
So I have my four elements in the array. I'm then passing newCountyInfo to another function to pull out the elements for display in some HTML elements.
The only way I know how to get to the individual elements in the function that uses them is this:
JSON.parse(JSON.stringify(newCountyValidation)).name
JSON.parse(JSON.stringify(newCountyValidation)).state
... etc...
There's got to be a better/shorter/more elegant way of doing this!
What is it?
Why are you serializing at all? I don't understand what JSON has to do with this, unless you're using web workers, ajax, or something else which demands serialization. Start with object literal syntax:
var newCountyInfo = {
name: newCountyName,
state: newCountyState,
zips: newCountyZips,
branchID: newCountyBranchID
};
And just pass the whole object to the other function:
someOtherFunction(newCountyInfo);
Which can access the fields using plain old property accesses:
function someOtherFunction(foo) {
console.log(foo.name); // whatever was in newCountyname
}
No JSON whatsoever.
Something like this should work just fine:
var newCountyInfo = {
name: newCountyName,
state: newCountyState,
zips: newCountyZips,
branchID: newCountyBranchID
}
function test(newCountyValidation)
{
alert(newCountyValidation.name);
}
test(newCountyInfo);