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Bind event (bind () and remove event (unbind () in JQuery ())

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Bind event (bind () and remove event (unbind () in JQuery ())

This article describes in detail how to use and share examples of jQuery binding events and removing events. We recommend this article for your reference.

 

 

Sometimes, when an event is executed, you can solve it in a certain way if you want to cancel the event. For example, bind () (bind event) and unbind () (remove the event added through the bind () method) Methods to remove the effect of the event.

For example, in the following case:

 

The Code is as follows:


<Script type = "text/javascript">
$ (Function (){
$ ('# Btn'). bind ("click", function (){
$ ('# Test'). append ("<p> bind function 1 </p> ");
}). Bind ("click", function (){
$ ('# Test'). append ("<p> bind function 2 </p> ");
}). Bind ("click", function (){
$ ('# Test'). append ("<p> bind function 3 </p> ");
});
})
</Script>

 

Html section:

 

The Code is as follows:


<Body>
<Button id = "btn"> Click Me </button>
<Div id = "test"> </div>
</Body>

 

When the button btn is clicked, three click events are triggered. The append () method here transmits the content of three paragraphs to the div layer.

The append () method appends the specified content at the end of the selected element (still inside. It is different from the html () method. The html () method changes the content of the entire element rather than appending content to the end of the element. The text () method is similar to the html () method, but the difference is that the html code can be written in the html () method and can be correctly parsed, while the text () method () only when the html code is a normal string.

Every time you click here, an event is executed and you want to add a paragraph at the end of the div layer. The following code cancels the event effect. You can delete the event to invalidate the click effect:

 

The Code is as follows:


<Script type = "text/javascript">
$ (Function (){
$ ('# Btn'). bind ("click", function (){
$ ('# Test'). append ("<p> bind function 1 </p> ");
}). Bind ("click", function (){
$ ('# Test'). append ("<p> bind function 2 </p> ");
}). Bind ("click", function (){
$ ('# Test'). append ("<p> bind function 3 </p> ");
});
$ ('# Delall'). click (function (){
$ ('# Btn'). unbind ("click ");
});
})
</Script>

 

$ ('# Btn'). unbind ("click"); this code cancels the click event under Element btn. It is not only effective for the bind () method, but also for the click () method. In a sense, bind ("click", function () {}) and click (function () {}) are equivalent.

You can also delete specific events based on specific methods. The following code can be referenced:

 

The Code is as follows:


<Script type = "text/javascript">
$ (Function (){
$ ('# Btn'). bind ("click", myFun1 = function (){
$ ('# Test'). append ("<p> bind function 1 </p> ");
}). Bind ("click", myFun2 = function (){
$ ('# Test'). append ("<p> bind function 2 </p> ");
}). Bind ("click", myFun3 = function (){
$ ('# Test'). append ("<p> bind function 3 </p> ");
});
$ ('# Deltwo'). click (function (){
$ ('# Btn'). unbind ("click", myFun2 );
});
})
</Script>

 

The second parameter of the unbind () method is the name of the execution function corresponding to the event. After the execution, only the myFun2 event is deleted, and the other two click events are executed normally.

Another method similar to the bind () method is one (). The difference is that the one () method is executed only once. Bind a one-time event handler function for a specific event (such as click) Matching Element. The Code is as follows:

 

The Code is as follows:


<Script type = "text/javascript">
$ (Function (){
$ ('# Btn'). one ("click", function (){
$ ('# Test'). append ("<p> bind function 1 </p> ");
}). One ("click", function (){
$ ('# Test'). append ("<p> bind function 2 </p> ");
}). One ("click", function (){
$ ('# Test'). append ("<p> bind function 3 </p> ");
});
})
</Script>

 

Click it and run it only once. Clicking again will not trigger the effect. This is the one method.

The above is all the content of this article. I hope this article will give you a better understanding of jQuery's binding events and removal events.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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