How to select all items in array at once, and add class to them

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I would like this function to hide buttons in my html, by giving them css .hidden attribute. I have tried [0, 1, 2, 3, 4] but it does not work as supposed, this code works but I was wondering if there is a more efficient way to do it..?

function hideButtons(){
var buttons = document.querySelectorAll('.buttons');
  buttons[0].classList.add('hidden'); 
  buttons[1].classList.add('hidden');
  buttons[2].classList.add('hidden');
  buttons[3].classList.add('hidden');
  buttons[4].classList.add('hidden');
}

Use a simple loop

for(var i = 0; i < buttons.length; i++){
    buttons[i].classList.add('hidden');
}

JavaScript Array every() Method, The every() method executes the function once for each element present in the array: If it finds an array element where the function returns a false value, every()​  The every() method checks if all elements in an array pass a test (provided as a function). The every() method executes the function once for each element present in the array: If it finds an array element where the function returns a false value, every() returns false (and does not check the remaining values) If no false occur, every() returns

Document.querySelectorAll(), The data() method joins the data array with the current selection. .append('div') .attr('class', 'data-item'); As seen in the preceding example, the append The divItems selection now contains three div elements, each one bounded to a data item. item') .append('p') .html(function(d) { return d; }); The div elements and their  When you work with arrays, it is easy to remove elements and add new elements. This is what popping and pushing is: Popping items out of an array, or pushing items into an array.

$('.buttons').addClass('hidden');

D3.js: Cutting-edge Data Visualization, returns an array-like object of all child elements which have all of the given class name(s). You may also call getElementsByClassName() on any element; it will return only Here we'll find all div elements that have a class of 'test': Only elements with ALL of the classNames specified are selected. There are some really cool use cases for .reduce() outlined in the MDN docs that provide examples on how to do things likes flattening an array of arrays, grouping objects by a property, and removing duplicate items in array..forEach() Applies a function on each item in an array. Example. Log each array item to the console

Try this, it's a bit easier solution

$('.buttons').hide();

Document.getElementsByClassName(), This post examines all the ways multiple DOM elements can be manipulated. Because: it returns an array-like object that is a live HTMLCollection . Hope it also helped you, drop a comment if you have something to add. reserved and yadda yadda © 2020; I can write pretty much anything here, no one will notice. The size of the array cannot be changed dynamically in Java, as it is done in C/C++. Hence in order to add an element in the array, one of the following methods can be done: By creating a new array: Create a new array of size n+1, where n is the size of the original array. Add the n elements of the original array in this array.

You can use jQuery to do your bidding:

 $('selector').addClass('class_name');

Remove a class name from multiple elements with pure JavaScript , D3.js - Array API · D3.js - Collections API · D3.js - Selection API · D3.js - Paths API In addition, it allows us to modify, append, or remove elements in a relation to select() − Selects only one DOM element by matching the given CSS selector. Tag of a HTML element (e.g. div, h1, p, span, etc.,); Class name of a HTML  If existing elements of the array are changed, their value as passed to callback will be the value at the time every visits them. Elements that are deleted are not visited. every acts like the "for all" quantifier in mathematics. In particular, for an empty array, it returns true.

D3.js - Selections, selectAll(this) where “this” is the specific element(s) you are trying to select. the first element that matches to the criteria specified, if you are selecting one of When .data() is called it joins the array of values with the array of selections We can improve the code by using D3 generate and append elements into the DOM. In this part of the C# programming tutorial, we will cover arrays. We will initiate arrays and read data from them. C# array definition. An array is a collection of data. A scalar variable can hold only one item at a time. Arrays can hold multiple items. These items are called elements of the array. Arrays store data of the same data type. Each

D3 Basics - D3, A string containing a selector expression, a DOM element, or an array of It accepts two arguments, index , which is the element's index in the jQuery selection. Type: jQuery. An existing jQuery object to match the current set of elements against. Given a For example, suppose our list had an id applied to one of its items:  In the above program, the for-each loop is used to iterate over the given array, array. It accesses each element in the array and prints using println() . Example 2: Print an Array using standard library Arrays

.not(), Description: Adds the specified class(es) to each element in the set of matched A function returning one or more space-separated classes or an array of addClass() method manipulated the className property of the selected Once the property was changed, it was the browser that updated the attribute accordingly. At this point, you’re starting to wonder how to add items to an array. The quick answer is that you can’t. An array is a fixed size in memory. If you need to grow it or add a single item to it, then you need to create a new array and copy all the values over from the old array.

Comments
  • thanks for answer, but I am not using jquery in this particular case, since I am using querySelector
  • You added tag "jquery-selector" to your question so I supposed you are using jquery.