[英]How to call php methods from js?
我正在研究柜台服务项目,我需要控制客户的流量,每个客户可以在柜台有5分钟。 另一方面,系统应控制5个计数器。
这是我尝试解决问题的方法。 看看我的MWE:
//this is part of the code where I set the timer for each counter. function increment() { if (running == 1) { setTimeout(function() { time++; var mins = Math.floor(time / 10 / 60); var secs = Math.floor(time / 10); var tenths = time % 10; if (mins == 5) { //after 5 mins is over the system should call php deQueue() method to dequeue the current and point out to next customer. document.getElementById("message").innerHTML = "Currently, Counters are available... Next Customer..." deQueue(); //this is my php method. available(); } document.getElementById("timer").innerHTML = mins + ":" + secs + ":" + tenths; increment(); }, 100) } }
//And this is my php file. <?php public function deQueue(){ if (!$this->isEmpty()) { $this->front = ($this->front+1) %5; $this->size--; }else{ echo "The Counter is empty! <br>"; } } ?>
现在你需要对你的php文件使用ajax请求,如下所示:
function increment() {
if (running == 1) {
setTimeout(function() {
time++;
var mins = Math.floor(time / 10 / 60);
var secs = Math.floor(time / 10);
var tenths = time % 10;
if (mins == 5) ajaxDequeue(mins);
document.getElementById("timer").innerHTML = mins + ":" + secs + ":" + tenths;
increment();
}, 100)
}
}
function ajaxDequeue(mins){
$.ajax({
url: 'ajax.php?minutes=' + mins,
beforeSend: function()
{
document.getElementById("message").innerHTML = "Currently, Counters are available... Next Customer..."
},
success: function(response)
{
document.getElementById("message").innerHTML = response;
}
});
}
然后在你的ajax.php文件中设置它以检查分钟值
<?php
$minutes = $_GET["minutes"];
if (isset($minutes)) deQueue();
public function deQueue(){
if (!$this->isEmpty()) {
$this->front = ($this->front+1) %5;
$this->size--;
}else{
echo "The Counter is empty! <br>";
}
}
?>
对我来说,你似乎试图直接从JavaScript调用PHP函数。 用简单的词来形容它,这两种语言通常需要一个额外的层来进行通信,称为HTTP ,因为PHP在Web服务器上运行,JavaScript在webbrowser上运行。
要在“一段时间后”执行JavaScript函数,您可以使用setTimeout 。
要打开与PHP(webserver)的通信,您可以使用AJAX 。
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