Can multiple jquery controls bind an event?

In web development, it is often necessary to bind the same event to multiple controls to achieve the same function. For example, clicking multiple buttons will trigger the same event. jQuery can implement this function very conveniently. Let's introduce in detail how to use jQuery to bind the same event to multiple controls.

1. Binding a single control event

To bind an event to a control in jQuery, you can use the following code:

$(selector).bind(eventType, handler);

Among them, selector means The control selector to bind the event, eventType represents the event type to be bound, and handler represents the event processing function. For example, the following code binds a click event to the button with id btn:

$('#btn').bind('click', function() {
  alert('按钮被点击了！');
});

2. Bind multiple control events

In actual development, it is often necessary Bind the same event to multiple controls. If you use the above code to bind events to each control, it will be very troublesome. To simplify the code, you can use the methods provided by jQuery to bind events to multiple controls at the same time.

$(selector1, selector2, ..., selectorN).bind(eventType, handler);

Among them, multiple selectors separated by commas represent multiple controls to which events are bound. The meanings of eventType and handler are the same as binding events to a single control. For example, the following code binds a click event to the three buttons with IDs btn1, btn2 and btn3:

$('#btn1, #btn2, #btn3').bind('click', function() {
  alert('按钮被点击了！');
});

3. Use the on method to bind the event

After jQuery 1.7, it is recommended to use the on method to bind events. The usage of the on method is similar to the bind method, but the syntax is slightly different. You can also use the on method to bind the same event to multiple controls at the same time.

$(selector1, selector2, ..., selectorN).on(eventType, handler);

For example, the following code binds a click event to all buttons with class btn:

$('.btn').on('click', function() {
  alert('按钮被点击了！');
});

4. Unbind event

If you no longer need an event of a control, you can use the unbind method or off method provided by jQuery to unbind it.

$(selector).unbind(eventType, handler);
$(selector).off(eventType, handler);

Among them, selector represents the control selector to unbind the event, eventType represents the event type to be unbound, and handler represents the event processing function. For example, the following code cancels the click event of the button with id btn:

$('#btn').unbind('click');
$('#btn').off('click');

5. Notes

When binding the same event to multiple controls, you need Pay attention to the following issues:

• If the event handling function needs to use some properties or values ​​of the control, then you need to use the this keyword to obtain the properties or values ​​of the current control.
• If the event handling functions bound to multiple controls are the same, you can define the event handling function as a public function, and then pass in the function name when calling the bound event.
• If different event handling functions are bound to the same control at the same time, all event handling functions need to be released when unbinding.

The above is a detailed introduction to using jQuery to bind the same event to multiple controls. When you encounter a situation where you need to bind the same event to multiple controls, you can choose the appropriate method to bind and unbind according to actual needs.

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