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The methods for stopping setInterval and setTimeout events in JavaScript

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The methods for stopping setInterval and setTimeout events in JavaScript

This article describes how to stop the execution of setInterval and setTimeout events in JavaScript. This article describes the code and syntax for operating instances. For more information, see

 

 

The setInterval and setTimeout methods are often used to execute loop events in js Code. The details of these two methods are not discussed here, this section briefly describes how to stop a loop event.

(1) The setInterval method can call functions or computation expressions according to the specified period (in milliseconds). To stop this method, you can use the clearInterval method. Example:

The Code is as follows:


<Html>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Body>
<Input type = "text" id = "clock" size = "50"/>
<Script language = javascript>
Var int = self. setInterval ("clock ()", 50); // call the clock () function every 50 milliseconds
Function clock (){
Var t = new Date ();
Document. getElementById ("clock"). value = t;
}
</Script>
<Button onclick = "window. clearInterval (int)"> stop interval </button>
</Body>
</Html>

 

Syntax clearInterval (id_of_setinterval)

The id_of_setinterval parameter indicates the ID value returned by setInterval.

The clearInterval () method can cancel the timeout set by setInterval (); the parameter of the clearInterval () method must be the ID value returned by setInterval.

(2) The setTimeout method is used to call a function or computing expression after a specified number of milliseconds. You can use the clearTimeout method to stop this method. Example:

Note: setTimeout () is executed only once. If you want to call it multiple times, use setInterval () or let the code itself call setTimeout () again ().

 

Copy the Code as follows:


<Html>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Script type = "text/javascript">
Var c = 0;
Var t;
Function timedCount (){
Document. getElementById ('txt '). value = c;
C = c + 1;
T = setTimeout ("timedCount ()", 1000 );
}
Function stopCount (){
ClearTimeout (t );
}
</Script>
</Head>
<Body>
<Input type = "button" value = "Start count" onClick = "timedCount ()">
<Input type = "text" id = "txt">
<Input type = "button" value = "Stop counting" onClick = "stopCount ()">
</Body>
</Html>


The clearTimeout () method can cancel the timeout set by the setTimeout () method.

 

Syntax clearTimeout (id_of_settimeout)

The id_of_setinterval parameter indicates the ID value returned by setTimeout. This value identifies the delayed execution code block to be canceled.

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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