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What is the difference between jQuery.map() and jQuery.each() Functions in jQuery?
jQuery map function
The map method translates a set of elements in the jQuery object into another set of values in a jQuery array which may, or may not contain elements.
Example
You can try to run the following code to learn how to work with jQuery.map() method:
<html>
<head>
<title>jQuery Map Method</title>
<script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
var mappedItems = $("li").map(function (index) {
var replacement = $("<li>").text($(this).text()).get(0);
if (index == 0) {
// make the first item all caps
$(replacement).text($(replacement).text().toUpperCase());
} else if (index == 1 || index == 3) {
// delete the second and fourth items
replacement = null;
} else if (index == 2) {
// make two of the third item and add some text
replacement = [replacement,$("<li>").get(0)];
$(replacement[0]).append("<b> - A</b>");
$(replacement[1]).append("Extra <b> - B</b>");
}
// replacement will be an dom element, null,
// or an array of dom elements
return replacement;
});
$("#results").append(mappedItems);
});
</script>
<style>
body {
font-size:16px;
}
ul {
float:left;
margin:0 30px;
color:blue;
}
#results {
color:red;
}
</style>
</head>
<body>
<ul>
<li>First</li>
<li>Second</li>
<li>Third</li>
<li>Fourth</li>
<li>Fifth</li>
</ul>
<ul id = "results">
</ul>
</body>
</html>
jQuery each function
The each() method is a function to run for each matching element.
Example
You can try to run the following code to learn how to work with each function in jQuery:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("li").each(function(){
alert($(this).text())
});
});
});
</script>
</head>
<body>
<button>Value</button>
<ol>
<li>India</li>
<li>US</li>
<li>UK</li>
</ol>
</body>
</html>
Updated on: 2019-12-09T11:12:13+05:30
384 Views
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