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Jquery ajax technology realizes transmitting values ​​to a certain page every N seconds

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2018-07-02 14:30:372009browse

This article introduces jquery ajax technology to transfer values ​​​​to a page at regular intervals, as well as the syntax of the setinterval() method. Friends who are interested in this article can refer to it

Sometimes we It is necessary to pass values ​​to a certain page every once in a while, such as a chat room. Every few seconds, the value is passed to the database processing page and retrieved, and then displayed in the chat window. Or it can check every once in a while whether there is an interval of 2 minutes between the last time the user spoke and now, and if so, log out the user. At this time we will use the HTML DOM setInterval() method.

The setInterval() method calls a function or evaluates an expression at a specified period (in milliseconds).

The setInterval() method will continue to call the function until clearInterval() is called or the window is closed. The ID value returned by setInterval() can be used as an argument to the clearInterval() method.

Syntax: 

setInterval(code,millisec[,"lang"])

code

Required. A function to be called or a string of code to be executed.

millisec

Must. The time interval, in milliseconds, between periodic executions or calls to code.

eg:

 setInterval(function(){
      host = window.location.host
      $.post("http://"+host+"/index.php/Article/cpMes/value/1");
    },5000);

##Extension:

clearInterval() Method

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

eg:

<html>
<body>
<input type="text" id="clock" size="35" />
<script language=javascript>
var int=self.setInterval("clock()",50)
function clock()
 {
 var t=new Date()
 document.getElementById("clock").value=t
 }
</script>
</form>
<button onclick="int=window.clearInterval(int)">
Stop interval</button>
</body>
</html>

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