Retrieve a value in a xml file and use it in another function in Javascript

Question

I would like to retrieve a value in a xml file and use this value in another function.

I use:

function xmlparser() {
    var xmlhttp, myvar;
    xmlhttp = new XMLHttpRequest();
    xmlhttp.open("GET", "http://www.domain.net/xmlfile.xml", true);
    xmlhttp.onreadystatechange = function () {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            myvar = xmlhttp.responseXML.documentElement.getElementsByTagName("date")[0].textContent;
        }
    }
    xmlhttp.send();
}

How can I use myvar in another function ? Like

function test() {
    alert(myvar);
}

Thanks

zigdawgydawg · Accepted Answer · 2013-08-28 15:13:44Z

1

Like so:

function test(myvar) {
    alert(myvar);
}

function xmlparser()
{
    var xmlhttp, xml_build, xml_dashboard;
    xmlhttp=new XMLHttpRequest();
    xmlhttp.open("GET", "http://www.domain.net/xmlfile.xml", true);
    xmlhttp.onreadystatechange=function()
    {
        if (xmlhttp.readyState==4 && xmlhttp.status==200) {
            myvar=xmlhttp.responseXML.documentElement.getElementsByTagName("date")[0].textContent;
            test(myvar);
        }
    }
    xmlhttp.send();
}

answered Aug 28, 2013 at 15:13

zigdawgydawg

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3 Comments

Joshua Macmaoni Over a year ago

Hi Thanks for your answer. But the function 'test' in a big function doing many things. I just want to use 'myvar' in 'test' before running 'test'.

zigdawgydawg Over a year ago

When you make an AJAX request, the xmlhttp.onreadystatechange function is run once the AJAX HTTP request returns. So, the myvar variable is only set after the AJAX call returns (which could take a non-trivial amount of time). You can not rely on it's value being set until after you set it in the xmlhttp.onreadystatechange function. The function that is relying on myvar (test) should only be run after the AJAX call returns and myvar is set. You should call test inside the AJAX callback function, otherwise all bets are off as to what myvar would be set to. I hope that makes sense.

Joshua Macmaoni Over a year ago

That makes perfectly sense and helped me a lot. I made few changes in my code and it works.

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