jQuery Misc

Method

Description

Example

data()

Retrieve the value of a data attribute for the first element in the set of matched elements.

$("#element").data("key");

each()

Iterate over a jQuery object, executing a function for each matched element.

$("li").each(function(index, element) {  // Your code here});

get()

Retrieve the DOM elements matched by the jQuery object as an array.

var elements = $("p").get();

index()

Search for a given element from among the matched elements and returns its index.

var index = $("#item").index();

$.noConflict()

Relinquish jQuery's control of the `$` variable.

var jq = $.noConflict();

$.param()

Create a serialized representation of an array or object, suitable for use in a URL query string or Ajax request.

var queryString = $.param({ key1: "value1", key2: "value2" });

removeData()

Remove a previously-stored piece of data.

$("#element").removeData("key");

size()

Return the number of elements in the jQuery object.

var count = $("div").size();

toArray()

Retrieve all the DOM elements contained in the jQuery set as an array.

var elementsArray = $("p").toArray();


Example

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>jQuery Utility Methods Example</title>
  <script src="https://code.jquery.com/jquery-3.6.4.min.js"></script>
  <style>
    div {
      padding: 10px;
      margin: 5px;
      border: 1px solid #ccc;
    }
  </style>
</head>
<body>

<div id="exampleElement" data-info="Sample Data">This is an example element.</div>

<script>
  // Using data() method to retrieve and set data
  var infoData = $("#exampleElement").data("info");
  console.log("Data retrieved using data():", infoData);

  // Using each() method to iterate over elements
  $("div").each(function(index, element) {
    console.log("Element at index", index, ":", element);
  });

  // Using get() method to retrieve DOM elements as an array
  var elementsArray = $("div").get();
  console.log("Array of DOM elements:", elementsArray);

  // Using index() method to get the index of an element
  var elementIndex = $("#exampleElement").index("div");
  console.log("Index of #exampleElement among div elements:", elementIndex);

  // Using $.noConflict() to release the $ variable
  var jq = $.noConflict();
  jq(document).ready(function() {
    jq("div").css("background-color", "lightyellow");
  });

  // Using $.param() to serialize data for URL query string
  var params = { name: "John", age: 30, city: "New York" };
  var queryString = $.param(params);
  console.log("Serialized URL query string:", queryString);

  // Using removeData() to remove stored data
  $("#exampleElement").removeData("info");

  // Using size() to get the number of matched elements
  var elementSize = $("div").size();
  console.log("Number of div elements:", elementSize);

  // Using toArray() to convert the set of matched elements to an array
  var elementsAsArray = $("div").toArray();
  console.log("Matched elements as an array:", elementsAsArray);
</script>

</body>
</html>

Quick Recap - Topics Covered

jQuery Misc

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