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Editorial Team
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Asked: 2026-06-16T07:36:50+00:00

In index.html under body tag: <a href=javascript:setTempInc()>+</a> <a href=javascript:setMode(0)>-</a> and under <head><script type=text/javascript>: var

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In index.html under body tag:

<a href="javascript:setTempInc()">+</a> <a href="javascript:setMode(0)">-</a>

and under <head><script type="text/javascript">:

var url = "get.php";

function ajaxRequest()
{
    var xmlhttp = new XMLHttpRequest();

    xmlhttp.onreadystatechange = function()
    {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
        {
            var jsondata = eval("(" + xmlhttp.responseText + ")"); //retrieve result as an JavaScript object

            document.getElementById("y").innerHTML = jsondata.y;

        }
    }

    xmlhttp.open("GET", url, true);
    xmlhttp.send();
}

function setTempInc()
{
    var oldUrl = url;
    url = url + "9001" + jsondata.y;
    ajaxRequest();
    url = oldUrl;
}

I don’t understand where the problem is. url is a string and jsondata.y is a int but the script doesn’t work!

This function does, though:

function setMode(val)
{
    var oldUrl = url;
    url = url + "91" + val + "000";
    ajaxRequest();
    url = oldUrl;
}
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1 Answer

  1. Editorial Team

    I would think that 

    var jsondata = eval("(" + xmlhttp.responseText + ")");

    is not available to be called at

    url = url + "9001" + jsondata.y;

    as it is only defined inside the ajaxRequest function’s scope.

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