{"id":28061,"date":"2021-01-05T18:25:36","date_gmt":"2021-01-06T02:25:36","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=28061"},"modified":"2021-01-12T02:59:39","modified_gmt":"2021-01-12T10:59:39","slug":"jquery-each","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/jquery-each\/","title":{"rendered":"How jQuery each() Works"},"content":{"rendered":"\n<p>jQuery <code>each()<\/code> is a concise way to iterate over DOM elements. <code>Each()<\/code> method is designed to be called on the target jQuery object. A jQuery object is an object that contains one or more DOM elements and has access to jQuery methods. Not only is <code>each()<\/code> less prone to errors, it simplifies manipulating multiple DOM elements.<br><\/p>\n\n\n\n<p>jQuery <code>each()<\/code> requires a callback function \u2014 a function passed to another function that will be executed later. Inside of the callback function is access to the index number of the element and the element itself. A more comprehensive review of callback functions can be found <a href=\"https:\/\/careerkarma.com\/blog\/javascript-callback\/\">here<\/a>.<br><\/p>\n\n\n\n<p>The application of <code>each()<\/code> is as straightforward as any JavaScript loops, but there are some places for potential confusion. We will be clearing up these points as well as looking at syntax. At the end of this guide will be step-by-step code examples to see different ways to apply jQuery <code>each()<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is jQuery each()?<\/h2>\n\n\n\n<p>jQuery each is a loop method for the jQuery library. It works like a JavaScript loop by iterating over DOM elements. jQuery <code>each()<\/code> requires a callback function, and inside the callback function is where the DOM elements can be manipulated.<br><\/p>\n\n\n\n<p>While inside the body of the callback function, conditional statements can be used to change some of the selected elements. <a href=\"https:\/\/careerkarma.com\/blog\/how-to-use-ternary-operators-javascript\/\">Conditional statements<\/a> are if&#8230;then statements in JavaScript. This provides a deeper level of control over how exactly the elements are changed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">jQuery each() Syntax<\/h2>\n\n\n\n<p>jQuery each can be invoked in two ways. First, as a method called on a selected element. The callback function accepts up to two optional arguments: index and value. Index is the index number of the current element. If the current element was the first in the list, the index number would return 0.<br><\/p>\n\n\n\n<p>The value argument refers to the current element. It is important to note that to chain a method to the value requires wrapping value in a jQuery selector. Let\u2019s put this all into some abstract code so we can break down the syntax.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>$('div').each((index, value) =&gt; {\n  console.log(`${index}: ${$(value).text()}`)\n})<\/pre><\/div>\n\n\n\n<p>Here, we are selecting each &lt;div&gt; on the page and looping through it. At each iteration, we have access to the index position and value of the current element. Returning simply <em>$(value) <\/em>gives us the dreaded <em>[object Object] <\/em>value.<br><\/p>\n\n\n\n<p>Remember that <em>[object Object]<\/em> is a string representation of an object. This means we need to call a method to extract the exact value we want. In the case above, we are using the <code>text()<\/code> method to reveal the text attribute of the object. Read more about <a href=\"https:\/\/careerkarma.com\/blog\/javascript-object-object\/\"><em>[object Object]<\/em><\/a><em> <\/em>to get a sense of what exactly is being returned.<br><\/p>\n\n\n\n<p>The above example will log the index number followed by the text attribute for each &lt;div&gt;. If we did not need access to the index, we could refactor the code as such:<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>$('div').each(function() {\n  alert($(this).text())\n})<\/pre><\/div>\n\n\n\n<p>Writing it like this logs the text of the current &lt;div&gt; element as well. In the scope of this callback function, the keyword <em>this<\/em> also refers to the element previously referred to by the value variable. Note that you cannot access the keyword <em>this<\/em> in an arrow function.<br><\/p>\n\n\n\n<p>Although arrow functions are a compact alternative to writing a function, it does not bind to the keyword this. In other words, the object returned by using this in an arrow function is not what is returned by this when written in functional notation.<br><\/p>\n\n\n\n<p>This <a href=\"https:\/\/careerkarma.com\/blog\/javascript-arrow-function\/\">guide<\/a> covers the ins and outs of arrow functions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">jQuery each() Examples<\/h2>\n\n\n\n<p>Let\u2019s expand on the above syntax examples and add some attributes. We start off with a basic HTML rendering of a list of colors belonging to various classes.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>&lt;div class=&quot;colorSelect&quot;&gt;Red&lt;\/div&gt;\n&lt;div&gt;Pink&lt;\/div&gt;\n&lt;div class=&quot;color&quot;&gt;Orange&lt;\/div&gt;\n&lt;div class=&quot;colorSelect&quot;&gt;Purple&lt;\/div&gt;\n&lt;div class=&quot;colorSelect&quot;&gt;Blue&lt;\/div&gt;<\/pre><\/div>\n\n\n\n<p>This renders each text element in the DOM. First, let\u2019s begin by simply logging the text in the console using both arrow functions and a traditional function.&nbsp;<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>$('.colorSelect').each((index, value) =&gt; {\n  console.log($(value).text())\n})<\/pre><\/div>\n\n\n\n<p>By selecting only the &lt;div&gt;s with a class name of colorSelect, we log the text Red, Purple, and Blue. Notice how we are wrapping value in a new jQuery instance to call the jQuery <code>text()<\/code> method. Doing so returns just the text of the selected &lt;div&gt; elements.&nbsp;<br><\/p>\n\n\n\n<p>Let\u2019s return the same results, but by using the keyword <em>this.<\/em><br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>$('.colorSelect').each(function() {\n   console.log($(this).text())\n})<\/pre><\/div>\n\n\n\n<p>We can use an anonymous function \u2014 a function without a name, as the callback. Again, it returns the text Red, Purple, and Blue. It is worth mentioning that although arrow functions do have some functionality in jQuery, it\u2019s best practice to use traditional functional notation for jQuery callbacks.&nbsp;<br><\/p>\n\n\n\n<p>We now know how to iterate over a collection of elements. Now, let\u2019s have some fun and change the color!<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>&lt;div class=&quot;colorSelect&quot;&gt;Red&lt;\/div&gt;\n&lt;div&gt;Pink&lt;\/div&gt;\n&lt;div class=&quot;color&quot;&gt;Orange&lt;\/div&gt;\n&lt;div class=&quot;colorSelect&quot;&gt;Purple&lt;\/div&gt;\n&lt;div class=&quot;colorSelect&quot;&gt;Blue&lt;\/div&gt;\n\n&lt;div class='result'&gt;\n\n&lt;\/div&gt;\n\n&lt;style&gt;\n  .colorSelect {\n    color: blue;\n  }\n  \n  .green {\n    color: green;\n  }\n&lt;\/style&gt;<\/pre><\/div>\n\n\n\n<p>Keeping with the color list page, we now have added some classes to the &lt;style&gt; element.&nbsp;<br><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/yJ4bc-FN1c-yp8hxU5xJt9D4AUh1FYRL0_3vsL0VFgqjSSntRQRKvrTIEOVLF5_yN2IHLXI0nhRbnUtiHUMy--h5981aHAxKB5PpY3uFoL7-xELAFOHNo69ozfVUDFSg2QZKnd5I\" alt=\"\"\/><\/figure>\n\n\n\n<p>In this example, we have assigned the &lt;div&gt;s with the class colorSelect the color blue. We can get a little fancy and use a conditional statement to only change two of the three selected to the color green.<br><\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>$('.colorSelect').each(function() {\n  if ($(this).text() !== &quot;Purple&quot;) {\n    $(this).toggleClass('green')\n  }\n})<\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/gSx7iO5YQAMHsYBc3LP5JuHkZ7tK0rrOPnU6KPYImAq_-MommcPYoCKn_C_l1FmREtH6HzyMDUDWvNVXQhaE1t9UkTfiQVUflVMMCNrp4I6l8EyDlgrZdhcDYMQHp4kS7NTVWe3U\" alt=\"\"\/><\/figure>\n\n\n\n<p>We called <code>each()<\/code> on the &lt;div&gt;s that match our class selector. Then we used a conditional statement to check each selected element to see if the text property was \u201cPurple.\u201d In the body of the conditional statement, we have another instance of this.&nbsp;<br><\/p>\n\n\n\n<p>What this in the body of the conditional statement is referring to are the text attributes themselves that satisfy the condition. Based on our output, we know that this in the body of the conditional referred to text attributes \u201cRed\u201d and \u201cBlue.\u201d<br><\/p>\n\n\n\n<p>Since \u201cRed\u201d and \u201cBlue\u201d do not equal \u201cPurple,\u201d we used the jQuery toggleClass method to change the original class to the class green. To learn more about jQuery <code>toggleClass()<\/code>, I recommend reading this <a href=\"https:\/\/www.w3schools.com\/jquery\/html_toggleclass.asp\" target=\"_blank\" rel=\"noopener\" rel=\"nofollow\">article<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion&nbsp;<\/h2>\n\n\n\n<p>We covered a lot of ground in this guide. First, we learned that jQuery <code>each()<\/code> works a lot like any other JavaScript iterators, just for jQuery objects. Then we covered some syntax best practices and some potential problems in writing arrow functions and the traditional function notation.&nbsp;<br><\/p>\n\n\n\n<p>In our examples, we saw how arrow functions are useful, but limited. Here\u2019s a reminder to save yourself the headache and use traditional functional notation for all jQuery callbacks.&nbsp;<br><\/p>\n\n\n\n<p>We then had some fun and changed colors of text attributes. By using a conditional statement in the body of the <code>each()<\/code> loop, we saw how we can select and change only the elements that satisfy our condition.&nbsp;<br><\/p>\n\n\n\n<p>Now, it\u2019s up to you to practice your new found jQuery looping patterns. Start small then build up to seeing what all jQuery <code>each()<\/code> is capable of.<\/p>\n","protected":false},"excerpt":{"rendered":"jQuery each() is a concise way to iterate over DOM elements. Each() method is designed to be called on the target jQuery object. A jQuery object is an object that contains one or more DOM elements and has access to jQuery methods. Not only is each() less prone to errors, it simplifies manipulating multiple DOM&hellip;","protected":false},"author":104,"featured_media":22999,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[11933],"tags":[],"class_list":{"0":"post-28061","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-javascript"},"acf":{"post_sub_title":"","sprint_id":"","query_class":"JavaScript","school_sft":"","parent_sft":"","school_privacy_policy":"","has_review":null,"is_sponser_post":"","is_guest_post":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How jQuery each() Works | Career Karma<\/title>\n<meta name=\"description\" content=\"jQuery each() is a commonly used method for looping over DOM objects. 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