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Introduction to jQuery change()

Web development, programming languages, Software testing & others

Syntax:

It generates a change event for the selected element as shown below :

$(selector).change()

It provides a change event for the selected element by adding function to it as shown below:

$(selector).change (content)

Function: This is an optional parameter which stipulates the function to run once the change event occurs for the chosen elements. The return value will be an element with the modification.

The syntax can be written as shown below :

$(selector).change (function(){ }); Examples to Implement jQuery change() Method

We frequently come through circumstances where we need changes made to a textbox or drop-down list to be identified or detected. The method jQuery change() method will allow you to identify or detect any modification in an input element. The jQuery change event works only when there is a change in an element value. It only operates in fields of form Once the change event occurs, the change() method adds a function to run with it.

Below are the examples of jQuery change() methods:

Example #1

Code:

div { color: green; } $( “select” ) .change(function () { document.getElementById(“mytxt1″).innerHTML=” The selected element from the list is : “+document.getElementById(“mytxt”).value; });

Output:

The output will be displayed as shown in the below image:

Example #2

Code:

div { color: green; } $( “select” ) .change(function () { var str_val = “”; $( “select option:selected” ).each(function() { str_val += $( this ).text() + ” “; }); $( “div” ).text( str_val ); }) .change();

Output:

In the above example, multiple elements can be selected from the list.

Example #3

$(document).ready(function(){ $(“textarea”).change(function(){ alert(” The value of the text area has been changed … “); }); });

Output:

When you load the above code, the below result will get displayed. The below output shows before the text area value changes:

Example #4

Code:

$(document).ready(function () { $(‘#txt’).change(function () { switch (this.value) { case “red”: case “orange”: case “green”: $(‘#myElement’).css(‘background-color’, this.value); break; default: $(‘#myElement’).css(‘background-color’, ‘#FFF’); break; } }); });

Output:

In the above result, when you select the specific color name from the list, then the respective color will get displayed in the box.

Example #5

$(document).ready(function () { $(‘#fname’).change(function () { alert($(this).attr(‘id’) + ‘: ‘ + $(this).val()); }); $(‘#lname’).change(function () { alert($(this).attr(‘id’) + ‘: ‘ + $(this).val()); }); });

Output:

When you run the code, you will get the below output.

Enter the text in the text fields as shown below:

Conclusion

So far, we have already seen how you can easily capture changes in elements using the jQuery change() method. This is definitely a very helpful method, as it helps us to collect the values on the client-side and to conduct some validations until submitting the information. The jQuery change() method must either execute the change event or incorporate the function to implement when a change occurs. The change event takes place while choosing a menu option. The change event happens when the field loses focus for text fields or text areas once the information has been altered. The jQuery change() method is an alternative of using both on () or trigger () methods with the change event as the first parameter.