Jquery javascript array for

How do I properly incorporate arrays into for loops in jquery/javascript?

Check out my sample and this jsFiddle Demonstration Sample More Information JavaScript Array Tutorial ​ Solution 2: firstly, will return a string, so parse it to an integer Then you can simply use a loop to create your array: This would create an array with values , if you want it to start at 1 just add 1 to the Solution 3: Something like this should suffice: Solution 4: There is no special way for this in jQuery. First I tried which works fine for key array.

How do I properly incorporate arrays into for loops in jquery/javascript?

I am working on a custom gallery right now, but I cannot seem to get the array of variables to apply during the loop. What am I missing?

Here is the relevant code:

var racerImage = ['$("img.ryanthumb")', '$("img.pierthumb")', '$("img.jeremythumb")', '$("img.mattthumb")', '$("img.andrewthumb")', '$("img.alanthumb")', '$("img.kevinthumb")', '$("img.mikethumb")', '$("img.dougthumb")']; var showMe= ['showRacer("ryan")\;', 'showRacer("pier")\;', 'showRacer("jeremy")\;', 'showRacer("matt")\;', 'showRacer("andrew")\;', 'showRacer("alan")\;', 'showRacer("kevin")\;', 'showRacer("mike")\;', 'showRacer("doug")\;']; for (var i = 0; i < racerImage.length; i++) < racerImage[i].click(function()< switch (i) < case 0: showMe[i]; break; case 1: showMe[i]; break; case 2: showMe[i]; break; case 3: showMe[i]; break; case 4: showMe[i]; break; case 5: showMe[i]; break; case 6: showMe[i]; break; case 7: showMe[i]; break; case 8: showMe[i]; break; >>); > 

Basically I am trying to use a for loop to apply the jquery multiple times instead of writing it over and over again. I don’t know if I am going about this the right way, but any insights would be great. Thanks again!

You ended up having three main problems:

1. You have jQuery code strings in the racerImage array which end up being just strings, not actual jQuery objects so they don’t work.
2. You have function call code strings in the showMe array which don’t work either.
3. Your value of i in the click handler function doesn’t work because the event handler happens some time later when the value of i is no longer what you want it to be.

To fix those, change the racerImage array to just an array of selectors and turn them into jQuery objects when needed in your code.

Change the showMe array into an array of names that you can just pass to the showRacer() function when needed.

And, you don’t need the switch statement at all since i is already your index.

var racerImage = ["img.ryanthumb", img.pierthumb, "img.jeremythumb", "img.mattthumb", "img.andrewthumb" /* and so on */]; var showMe= ["ryan", "pier", "jeremy", "matt" /* and so on */]; for (var i = 0; i < racerImage.length; i++) < // create closure to capture the value of i so it is available during the event handler (function(i) < $(racerImage[i]).click(function()< showRacer(showMe[i]); >); >)(i); > 

racerImage[0] is still just a string which contains the value $(«img.ryanthumb») — it is not the jQuery object.

What you probably want to do is put the selector value in the string, and then call the jQuery function from there:

var racerImage = ['img.ryanthumb', 'img.pierthumb', . etc. ]; . $(racerImage[i]).click(function()); 

Or you can have your array be the jQuery objects and use them:

var racerImage = [$("img.ryanthumb"), $("img.pierthumb"), . etc. ]; . racerImage[i].click(function()); 

Thanks Joel for the comment — yep, same problem on showRacer — maybe those can be an array of functions:

var showMe= [function(), function(), . etc. ]; . showMe[i](); 

var racer = ['ryan', 'pier', 'jeremy', 'matt', 'andrew', 'alan', 'kevin', 'mike', 'doug']; $.each(racer, function(i, v)< $('img.'+v+'thumb').click(function()< showRacer(v); >) >); 

Javascript/jquery for loop array, The first argument you’ll receive in the function you pass to each will be the index of the element (if the object you’re going over is an array) or a key (if it’s an associative array). Try: $.each (browserTransitionCSS, function (i, element) < …

JQuery: how to make an array with a loop

I am trying to create an array in jquery, which is filled through a loop.

count = jQuery('#count_images').val(); 

With the above code I get an integer value (such as 5, for example). What I would like to know, is how I can do something like this in jQuery:

int arrLength = count; string[] arr1 = new string[arrLength]; int i = 0; for (i = 0; i

So in the end my array for example 5 would look like this: [1,2,3,4,5] .

Description

This is more about javascript and not jquery. Check out my sample and this jsFiddle Demonstration

Sample

var arrLength = 5; var arr1 = []; var i = 0; for (i = 0; i != arrLength; i++) < arr1.push(i) >alert(arr1.length) 

More Information

firstly, val() will return a string, so parse it to an integer

var count = parseInt(jQuery('#count_images').val(),10); 

Then you can simply use a loop to create your array:

This would create an array with values [0,1,2,3,4] , if you want it to start at 1 just add 1 to the i

Something like this should suffice:

var my_array = []; var count = 5; // let's assume 5 for(var i=0; i

There is no special way for this in jQuery. It’s the simpliest way:

Javascript — JQuery for loop, 5 Answers Sorted by: 1 To loop between two values you should use a regular Javascript loop. The jQuery each methods are used when looping through a collection of elements or an array. To loop from zero, you should initialise the loop variable to zero, not one.

How to loop through an array of arrays using jQuery or JavaScript?

I have a json array like this

I wanted to loop through key which is 3 times, and inside the key loop I wanted loop again through each of the elements inside key .

First I tried $.each which works fine for key array. And inside the each function I tried to get the key values using Object.key(this) inside the loop which returned me the names

But I’m not able to loop through the names I got.

I don’t know if this is the right way of doing it, when I tried doing it this was. I got an error telling .each is not a function.

Any help will be much appreciated.

The simple way to do this would be to use three loops, but trying to make that work with this taking on a new meaning in each loop would be unnecessarily complicated.

I recommend using .forEach and giving a clear name to each loop variable:

var data = [ < arr1: [ , , , ] >, < arr2: [ , , , ] >, < arr3: [ , , , ] > ]data.forEach(function (outerObj) < Object.keys(outerObj).forEach(function (key) < outerObjJquery javascript array for.forEach(function (item) < console.log(item); >); >); >); 

Of course, there may be a better solution if you would actually tell us what you wanted to accomplish with these loops.

If you want to keep with the jQuery pattern, then just keep using each for each nested level:

var data = [, , ]>, , , ]>, , , ]>];$.each(data, function(i, e) < $.each(e, function(key, arr) < console.log(key); $.each(arr, function(index, obj) < console.log(". ", index, obj.value); >); >); >)

I believe the reason your attempt is not working is because you are trying to .each the individual values themselves, rather than the arrays within data .

$.each(data, function(index, array) < // This each iterates over the arrays. $.each(array, function(subindex, value) < // This each iterates over the individual values. console.log(value); // Logs the individual values. >); >); 

Parse json array in jquery in foreach loop, If you use jQuery’s ajax call properly, it should already be a javascript array and you can just directly iterate it as an array. Step 1, do a console.log(data) to see exactly what it is. – jfriend00

Fill array with a for loop in JavaScript

I am trying to get the area of a polygon using JavaScript. To do this I need to convert the longitude and latitude points in my JSON array over to Cartesian x and y coordinates. This loop and function converts the longitude value to x for each longitude value in the array. I now need to make a new array with all of these values. At the moment it is making a new array for every value in the JSON array. Here is the result in the console:

[445.555480625] mapChoropleth.html:280 [1, 445.55897] mapChoropleth.html:280 [2, 2: 445.62943062500005] mapChoropleth.html:280 [3, 3: 445.63478375] mapChoropleth.html:280 [4, 4: 445.64964499999996] mapChoropleth.html:280 [5, 5: 445.6483775] mapChoropleth.html:280 [6, 6: 445.61210562499997] mapChoropleth.html:280 [7, 7: 445.612394375] mapChoropleth.html:280 [8, 8: 445.6023443750001] mapChoropleth.html:280 [9, 9: 445.604339375] mapChoropleth.html:280 [10, 10: 445.571159375] mapChoropleth.html:280 

This is how I am trying to fill the new array at the moment:

for (var i=0;i console.log(YLatToPixel(lng, '#map')); > 

Any help would be much appreciated!

To create a single array containing your results, the array needs to be created outside of your loop:

var array = new Array(); for (var i=0;i console.log(YLatToPixel(lng, '#map')); > 

To create arrays of lat and lng:

var lats = new Array(); var lngs = new Array(); for (var i=0;i console.log(YLatToPixel(lng, '#map')); > 

Is this something like what you are looking for?

How to Loop through an Array in JavaScript, An alternative to for and for/in loops is Array.prototype.forEach (). The forEach () runs a function on each indexed element in an array. Starting at index [0] a function will get called on index [0], index [1], index [2], etc… forEach () will let you loop through an array nearly the same way as a for loop: Javascript while loop

Источник

Перебор массивов и объектов в JS

Сборник методов для перебора элементов массива или массивоподобных объектов.

Цикл for

Перебор массива в цикле for

var data = ["Яблоко", "Апельсин", "Слива"]; for (var key in data)

Результат:

Перебор объекта в цикле for

var data = ; for (var key in data)

Результат:

Цикл forEach

var data = ["Яблоко", "Апельсин", "Слива"]; data.forEach(function(element, key)< console.log(key + ': ' + element); >);

Результат:

Перебор объектов с помощью forEach

var data = ; Object.entries(data).forEach((entry) => < const Jquery javascript array for = entry; console.log(key + ': ' + value); >);

Результат:

JQuery .each()

Метод .each() предназначен для цикличного обхода DOM-элементов, но также работает и массивами и объектами.

var data = ["Яблоко", "Апельсин", "Слива"]; $.each(data, function(key, value)< console.log(key + ': ' + value); >);

Результат:

Перебор объектов с помощью each()

var data = ; $.each(data, function(key, value)< console.log(key + ': ' + value); >);

Результат:

Комментарии

Другие публикации

Web Storage API это набор методов, при помощи которых в браузере можно хранить данные в виде пар ключ=значение на.

AJAX позволяет отправить и получить данные без перезагрузки страницы. Например, делать проверку форм, подгружать контент и т.д. А функции JQuery значительно упрощают работу.

В продолжении темы работы с массивами поговорим о типичной задаче – их сортировке. Для ее выполнения в PHP существует множество функций, их подробное описание можно посмотреть на php.net, рассмотрим.

Сборник jQuery приемов с textarea — получить содержимое, вставить значение, подсчет количества символов и строк и т.д.

Для замены Favicon во вкладке браузера достаточно у элемента link rel=»icon» в атрибуте href указать путь до нового.

Источник

jQuery.each()

jQuery.each( array, callback ) Returns: Object

Description: A generic iterator function, which can be used to seamlessly iterate over both objects and arrays. Arrays and array-like objects with a length property (such as a function’s arguments object) are iterated by numeric index, from 0 to length-1. Other objects are iterated via their named properties.

version added: 1.0 jQuery.each( array, callback )

version added: 1.0 jQuery.each( object, callback )

The $.each() function is not the same as $(selector).each(), which is used to iterate, exclusively, over a jQuery object. The $.each() function can be used to iterate over any collection, whether it is an object or an array. In the case of an array, the callback is passed an array index and a corresponding array value each time. (The value can also be accessed through the this keyword, but Javascript will always wrap the this value as an Object even if it is a simple string or number value.) The method returns its first argument, the object that was iterated.

$.each([ 52, 97 ], function( index, value ) 
 alert( index + ": " + value );
>);

This produces two messages:

If an object is used as the collection, the callback is passed a key-value pair each time:

Источник