How to monitor select changes in jquery

Monitoring steps: 1. Use change() to bind the change event to the select element and set the event processing function, the syntax is "$("select").change(function() {...}); "; 2. In the event processing function, set the code that needs to be executed after the event is triggered. The syntax is "alert("The option has been changed"); console.log($('select').val());". When After a change is made, a pop-up window will pop up to remind you of the new options.

The operating environment of this tutorial: windows7 system, jquery3.6.1 version, Dell G3 computer.

In jquery, you can use the built-in listening function change() to monitor changes in select.

The change event occurs when the value of the element changes (only applicable to form fields).

The change() method triggers a change event, or specifies a function to run when a change event occurs.

Note: When used with select elements, the change event occurs when an option is selected.

Implementation steps

Step 1: Use change() to bind the change event to the select element and set the event processing function

$("select").change(function() {
	//事件触发后，执行的代码
});

Step 2: In the event processing function, set the code that needs to be executed after the event is triggered

$("select").change(function() {
	alert("选项已被改变");
	console.log($('select').val());
});

In this way, after the selection changes, a pop-up window will pop up to remind you and obtain New option content

Implementation code:

	
		
		
		
	

	

		

			
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