jQuery | change() with Examples
The change() is an inbuilt method in jQuery that is used to detect the change in value of input fields. This method works only on the “<input>, <textarea> and <select>” elements.
Syntax :
$(selector).change(function)
Parameter: It accepts an optional parameter “function”.
Return Value: It returns the element with the modification.
jQuery code to show the working of change() method:
Code #1:
In the below code, no function is passed to the change method.
<html> <head> 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="Donald" onchange="alert(this.value)" type="text"></p></body> </html> |
Output:
Before clicking the “Click Me” button-
After clicking the “Click Me” button-
Code #2:
In the below code, function is passed to the change method.
<html> <head> 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:
Before entering any values to the “Enter Value:” box-
After entering a values of “GeeksforGeeks” to the “Enter Value:” box and clicking outside of the box-
jQuery is an open source JavaScript library that simplifies the interactions between an HTML/CSS document, It is widely famous with it’s philosophy of “Write less, do more”.
You can learn jQuery from the ground up by following this jQuery Tutorial and jQuery Examples.
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