jQuery change() Method
jQuery change() is an inbuilt method that is used to detect the change in the value of input fields. This method works only on the “<input>, <textarea> and <select>” elements.
Syntax:
$(selector).change(function)
Parameters:
It accepts an optional parameter “function”.
Example 1: In the below code, no function is passed to the change method.
HTML
<!DOCTYPE html><html><head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> </script> <!--Demo of change method without passing function--> <script> $(document).ready(function () { $("button").click(function () { $("input").change(); }); }); </script></head><body> <p>Click the button to see the changed value !!!</p> <!--click on this button and see the change --> <button>Click Me!</button> <p>Enter value: <input value="w3wiki" onchange="alert(this.value)" type="text"> </p></body></html> |
Output:
Example 2: In the below code, function is passed to the change method.
HTML
<!DOCTYPE html><html><head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> </script> <!--Here function is passed to the change method--> <script> $(document).ready(function () { $(".field").change(function () { $(this).css("background-color", "#7FFF00"); }); }); </script> <style> .field { padding: 5px; } </style></head><body> <!--write something and click outside --> Enter Value: <input class="field" type="text"> <p> Write something in the input field, and then press enter or click outside the field. </p></body></html> |
Output: