[英]How to create a timer counter in JSF
I want to create an online test system, so i need a timer. 我想创建一个在线测试系统,所以我需要一个计时器。 When user start the test the timer will start counting down. 当用户开始测试时,计时器将开始倒计时。 But when user go to next question refresh the page the timer will still running. 但是,当用户转到下一个问题刷新页面时,计时器仍将运行。 How can I do that any suggestion? 我该怎么做呢?
You can also use PrimeFaces Extensions, they have timer in their API. 您也可以使用PrimeFaces扩展程序,它们的API中包含计时器 。
Example: you put start of the test into @SessionScoped
bean, then calculate seconds remaining which will be used as an input to <pe:timer>
element: 示例:将测试的开始放入@SessionScoped
bean中,然后计算剩余的秒数,该秒数将用作<pe:timer>
元素的输入:
@SessionScoped
public class UserData {
private Date testStart;
/* getters and setters for testStart */
public int secondsRemaining() {
//calculate seconds remaining until end of the test from this.testStart
return secondsRemaining;
}
}
and then your test.xhtml would contain element 然后您的test.xhtml将包含元素
Time remaining: <pe:timer format="HH:mm:ss"
timeout="#{userData.secondsRemaining()}"/>
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