All Questions
Tagged with list javascript
1,981
questions
2122
votes
26
answers
1.3m
views
How do I check if a variable is an array in JavaScript?
How do I check if a variable is an array in JavaScript?
if (variable.constructor == Array)
- 38.1k
414
votes
15
answers
580k
views
Determine if string is in list in JavaScript
In SQL we can see if a string is in a list like so:
Column IN ('a', 'b', 'c')
What's a good way to do this in JavaScript? It's so clunky to do this:
if (expression1 || expression2 || str === 'a' || ...
- 49.6k
337
votes
5
answers
247k
views
Is the order of elements in a JSON list preserved?
I've noticed the order of elements in a JSON object not being the original order.
What about the elements of JSON lists? Is their order maintained?
- 9,029
225
votes
34
answers
280k
views
Build tree array from flat array in javascript
I have a complex json file that I have to handle with javascript to make it hierarchical, in order to later build a tree.
Every entry of the json has :
id : a unique id,
parentId : the id of the ...
- 2,489
127
votes
5
answers
370k
views
how to add new <li> to <ul> onclick with javascript
How do I add a list element to an existing ul using a function from an onclick? I need it to add to this type of list ...
<ul id="list">
<li id="element1">One</li>...
- 1,431
111
votes
11
answers
102k
views
Big list performance with React
I am in the process of implementing a filterable list with React. The structure of the list is as shown in the image below.
PREMISE
Here's a description of how it is supposed to work:
The state ...
- 9,138
72
votes
9
answers
43k
views
Javascript equivalent of PHP's list()
Really like that function.
$matches = array('12', 'watt');
list($value, $unit) = $matches;
Is there a Javascript equivalent of that?
- 23.8k
71
votes
3
answers
54k
views
JavaScript filter that stops at the first result
Is there a mechanism in JavaScript (without having to write my own) similar to filter. Instead of returning all the filtered elements of a collection though, it only returns the first one. Of course I ...
- 51.8k
41
votes
3
answers
16k
views
What is the equivalent of Python any() and all() functions in JavaScript?
Python has built in functions any() and all(), which are applied on a list (array in JavaScript) as following-
any(): Return True if any element of the iterable is true. If the iterable is empty, ...
- 1,655
37
votes
3
answers
26k
views
How to get union of several immutable.js Lists
So, I have List a:
let a = Immutable.List([1])
and List b:
let b = Immutable.List([2, 3])
I want to get List union === List([1, 2, 3]) from them.
I try to merge them fist:
let union = a.merge(b)...
- 13k
34
votes
5
answers
23k
views
Dealing with an empty list in mustache.js
I'm using mustache.js to render a template in javascript. I'd like to check if a list is empty or not to hide the <h2> tag in the following example. Is this possible or is mustache.js too logic-...
- 7,505
34
votes
5
answers
54k
views
How do I remove an element in a list, using forEach?
var people = ['alex','jason','matt'];
people.forEach(function(p){
if(p.length > 4){
//REMOVE THIS PERSON or pop it out of the list or whatever
}
});
console.log(people) //should ...
- 265k
31
votes
2
answers
79k
views
how to add spaces between array items javascript
I am a beginner at javascript so I appreciate any help/advice given.
My issue here is that I'm trying to figure out how to add space between items in the times[] array which holds the values for ...
- 495
29
votes
5
answers
43k
views
What is the highest performance way to filter a list of JSON objects in JavaScript?
Let's assume I have a huge (1000+) list of objects like this:
[{name: 'john dow', age: 38, gender:'m'}, {name: 'jane dow', age: 18, gender:'f'}, ..]
I want to filter this list by name (character ...
- 3,709
29
votes
5
answers
110k
views
A list of tuples in Javascript [closed]
Let's say I receive a JSON-string containing information about people.
Now I loop through all the JSON-objects and extract the name and age or each person.
How would I store these as tuples in a list ...
- 8,753
26
votes
8
answers
78k
views
Sorting dropdown list using Javascript
i want to sort the drop down items using javascript,can anyone tell me how to do this.
- 1,557
24
votes
7
answers
51k
views
Partitioning in JavaScript [duplicate]
Please consider an array such as :
arrayAll = [1,2,3,4,5,6,7,8,9]
Is there a package that enable to do partitioning to obtain :
arrayALLPartionned = [[1,2,3],[4,5,6],[7,8,9]]
I can see how to do ...
- 6,569
22
votes
7
answers
41k
views
material ui: how to change fontSize in Lists?
I am creating some forms using react js and material UI.
I would like to make the font size on some of the lists smaller in order to get a more compact presentation, but no matter at which level I ...
- 1,277
19
votes
7
answers
54k
views
How to scroll to li element in a ul list
I have a ul list inside a div with li elements and inside the li elements is a single checkbox. I have the id for the checkboxes. So I want to get the parent li element of the checkbox and scroll to ...
- 2,020
17
votes
9
answers
39k
views
How to loop through the alphabet via underscoreJS
I'm using Underscore's template() method in BackboneJS views. I'd like to show a list of alphabet letters in my view in order to sort a collection by letter.
As a result, I have a list of 26 links (...
- 713
15
votes
2
answers
10k
views
Prevent Selectize automatic sorting
I have an array of objects that is provided from a WebService (the order of the list is important). I loaded the JSON object into a Selectize control but it re-orders the list without using the order ...
- 2,105
14
votes
4
answers
23k
views
Display JSON data on a page as a expandable/collapsible list
I need help with with displaying JSON data on a page like expandable/collapsible list.
Here is a valid JSON I`ve made converting from XML with Python:
JSON Data
And to display it I`m usig this:
&...
- 141
14
votes
1
answer
49k
views
Jquery before submitting the form
I have a list, (a simple list) from which i am able to select and set elements (using js), and then a form that allows me to choose how many elements i want, and a submit form.if one doesn't select an ...
- 5,248
13
votes
1
answer
24k
views
How to list contents of a directory IN ORDER with node.js?
I'm a fairly experienced programmer and I've just recently discovered node.js. I love JavaScript because that's where I started (Web Development) so being able to write server-side code with its is ...
- 4,493
13
votes
1
answer
5k
views
react-window set item size according to content height
I'm using react-window to implement a chat message list, but I'm getting stuck trying to set the right itemSize to each item. Happens that a chat message, based on his text length and window width, ...
- 131
12
votes
4
answers
30k
views
AngularJS ng-disabled not working with list items
I am facing a problem with disabling a item in the list.
<div id="searchdropdown">
<ul>
<li>list1</li>
<li ng-disabled="someCondition" ng-click="...
- 2,232
12
votes
1
answer
40k
views
Sort a list by id by using javascript [duplicate]
I'm making a phonegap app on iOS that requires sort a list by time
I tried add the time to the id of each li item and then sort based on the id
<ul id="test">
<li id="4112">blub</li&...
- 121
11
votes
1
answer
18k
views
Javascript sorted lists
Is there a sorted list in Javascript or jQuery?
I have a huge list with few insert actions over time.
I cannot afford to call object.sort() for the entire list each time I add a single item.
I need ...
- 3,083
10
votes
3
answers
94k
views
Push values to array in jquery
I have List of items data and empty array quotations :
var data = {};
var quotations = [];
I want to fill quotations with data values ,Every time i add new data it added successfully but all ...
- 351
10
votes
4
answers
378
views
Best way to store a huge list with hashes in Javascript
I have a list with 10.000 entrys.
for example
myList = {};
myList[hashjh5j4h5j4h5j4]
myList[hashs54s5d4s5d4sd]
myList[hash5as465d45ad4d]
....
I dont use an array (0,1,2,3) because i can check
very ...
- 11.7k
9
votes
4
answers
20k
views
Is there any method/way in javascript to add a child node to list element dynamically?
If I have an unordered list like
<ul id="list">
<li>Helo World-1</li>
<li>Helo World-2</li>
<li>Helo World-3</li>
</ul>
I want to add a sublist item ...
- 1,247
9
votes
5
answers
28k
views
Search for an item in a list using jquery .filter()
I'm trying to input an input that looks into my list and returns the result below.
This is my list
<ul id="lista1" class="list-group">
<li id = "1" class="list-group-item d-flex ...
user6078180
9
votes
3
answers
40k
views
Trigger event when selecting in a dropdown javascript eventlistener
I have this javascript function,
function listQ(){
var e = document.getElementById("list");
if(e.selectedIndex > 0){
if("Blank Test" === e.selectedIndex){ alert("yo"); }
}
}
My problem is ...
- 163
9
votes
5
answers
9k
views
is there some method of array like set in python?
As I know in python i can set a list to a unique list like:
In [12]: a=range(12)
In [13]: a.append(5)
In [14]: a.append(4)
In [15]: a.append(5)
In [16]: a
Out[16]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, ...
- 952
8
votes
6
answers
10k
views
JavaScript Collections API?
I've searched quite a while for a Collections API (list, set) for JS and surprisingly I could only this: http://www.coffeeblack.org/work/jscollections/
This is exactly what I was looking for, but I'm ...
- 10.9k
8
votes
2
answers
12k
views
Django Dynamic Drop-down List from Database
I wanted to develop a Django app and one of the functionalities I'd like to have is dynamic drop-down lists...specifically for vehicle makes and models...selecting a specific make will update the ...
Stephen
7
votes
7
answers
30k
views
how to remove all li in my ul through with it id?
I have a ul list.
I want to remove all li in my ul through with it id?
- 569
7
votes
8
answers
34k
views
Convert Java List to Javascript Array
I have the following java code in my Android application and wanted a way to convert the Java list to an array that can be used in javascript:
Java:
public void onCompleted(List<GraphUser> ...
- 13.2k
7
votes
1
answer
13k
views
Filtering Nested Array with Lodash/Javascript
I have the following object array:
var sizeList = [
{ id: 1, title:"Test1",
type:[{name:"Big", present:false}, {name:"Small", present:true}, {name:"Medium", present:false}]
},
{ ...
- 10.8k
7
votes
4
answers
53k
views
How to get elements inside tags using queryselector?
var divElement = document.createElement("div");
divElement.setAttribute('id', 'Items');
var ulElement = document.createElement("ul");
var liElement = document.createElement("li");
var spanElement1 = ...
- 159
7
votes
1
answer
1k
views
Possible to get list item (<li>) label with JavaScript?
If I've got a ul with 3 items in it and the list-style-type is set to lower-alpha, I end up with this
a. Item 1
b. Item 2
c. Item 3
With jQuery, I can easily get the value of any item ...
7
votes
3
answers
2k
views
Array comprehension in JavaScript? [duplicate]
I was wondering what the neatest way would be to convert (from Python) a list comprehension into Javascript. Is there anything which will make this readable and not a mess?
non_zero_in_square = [ ...
- 368k
7
votes
2
answers
3k
views
Error in building Sencha Touch 2 application
While I am building my sencha touch 2 app using the command:-
sencha app build production
but it throws an error:
[INFO] Deploying your application to /Applications/MAMP/htdocs/iPadapp/build/...
- 834
7
votes
4
answers
13k
views
Filling a dropdown list based on another dropdown list in the same html form
I have an HTML form with a bunch of options inside and I'd like to change the values inside those options based on previous user selection:
Let's say I have something like this:
<select name="...
- 394
6
votes
3
answers
60k
views
AngularJS display list from an array
I have a controller that returns an array, I'm trying to display every element of that array as a list.
What I am attempting to do, which is not working:
<li ng-repeat="Name in names">
<...
- 1,475
6
votes
3
answers
16k
views
Using createTextNode() but I need to add HTML tags to it (JavaScript/JQuery)
When I click an item in a table, I need it to add that item to a list and display that list.
Here's my code for adding/displaying the items in the list:
var myList = document.getElementById('my-...
- 860
6
votes
5
answers
17k
views
An automatically scrolling live ticker (like the "Top Tweets" of Twitter)
Is there a good Javascript library for generating an automatically scrolling list like the "Top Tweets" on the Twitter homepage? Preferable as jQuery plugin. It should also support AJAX functionality (...
- 16.3k
6
votes
2
answers
17k
views
Google Maps API: pan to markers from a list.
Hello :) Please bear with me, I'm not a coder but I'm trying to learn by doing. This is the page I'm working on currently; http://www.websu.it/devnw/dev/contact.html.
I've currently set up a map using ...
- 180
6
votes
2
answers
5k
views
How to toggle class for the only one element on click in react
I am trying to make a flipped set of cards in React. You can see my code below. When I click on the card, they all flipped, but my goal is to flip only those that i clicked on. How can I do this?
...
- 73
6
votes
1
answer
2k
views
regex to replace 0 in list but not 0 of 10, 20, 30, etc. - using js replace
I'm trying to create a regex to replace zeros in list with an empty value but not replace the zeros in ten, twenty, thirty, etc.
list = 0,1,0,20,0,0,1,,1,3,10,30,0
desired list = ,1,,20,,,1,,1,3,10,...
- 364