Question

谁能解释为什么? 我在此守则:

<script>
$(document).ready(function()
{
    refresh();
});

function refresh()
{      
    $.getJSON( getMessageDetails.php , function (json) {
        //alert(json.length);
        //$("#subject1").html(json[0].subject);
        //$("#unique_code1").html(json[0].unique_code);  
        $("#msg_id").html(json[0].id);
        $("#subject").html(json[0].subject);
        $("#unique_code").html(json[0].unique_code);  
        if (json.length > 0 )
        {
            //alert(json.length);
            window.location.reload(); 
        }     
        else
        {
            //do something
        } 
    }); 
    window.setTimeout(refresh,30000);
}
</script>

What I am trying to do is if a new message came in json wont be empty so reload the page and if there are no new messages, keep on checking

What happens now is a new message comes in and the screen just starts flashing like crazy! It must do the reload once and then every 30 seconds check again. Any help please? Thank you.

Answer 1

我认为,你正在寻找<代码>Interval,因为它与你一样,希望每隔30秒将你的职责称为你,而不是重载整页(window.place.reloaddoes)。

例:

function sayHello(){
alert( hello once again );
}
setInterval(sayHello,30000);

因此,你必须做的是,把你的宇宙航空研究开发机构的呼吁总结为一项功能,然后适用一个<条码>,即“Interval,在接下去时加以界定。

Answer 2

我认为,你应当:

$(document).ready(function()
{
    var int = setInterval(refresh,30000);
});

function refresh()
{      
$.getJSON( getMessageDetails.php , function (json) {
 //alert(json.length);
 //$("#subject1").html(json[0].subject);
 //$("#unique_code1").html(json[0].unique_code);  
 $("#msg_id").html(json[0].id);
 $("#subject").html(json[0].subject);
 $("#unique_code").html(json[0].unique_code);  
 if (json.length > 0 )
 {
    //alert(json.length);
    window.location.reload(); 
 }     
 else
 {
    //do something
 } 
 }); 

 }

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