AJAX sequential request to the same page -

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i trying make 2 ajax requests same page 1 after another. but, getting response of last request. have below code.

<html> <head> <script type="text/javascript"> var xmlhttp;  xmlhttp = new xmlhttprequest();  xmlhttp.open("get","getcdr.php?r=2",true); xmlhttp.send();  xmlhttp.open("get","getcdr.php?r=4",true); xmlhttp.send();  xmlhttp.onreadystatechange=function() { if (xmlhttp.readystate==4 && xmlhttp.status==200)  {       document.getelementbyid("mytab").innerhtml=document.getelementbyid("mytab").innerhtml+xmlhttp.responsetext;  } }    </script> </head> <body> <table id="mytab"> <tr><td>sl</td><td>mal</td></tr> </table> </body> </html>

your second request overwriting first request. since you're using async requests, should leveraging callbacks make sequential callbacks, if 1 request depends on another.

consider making second request within callback of first request.

function makerequestone(){   var xmlhttp;    xmlhttp = new xmlhttprequest();    xmlhttp.open("get","getcdr.php?r=4",true);   xmlhttp.send();    xmlhttp.onreadystatechange=function(){     if (xmlhttp.readystate==4 && xmlhttp.status==200){       console.log("request 1 complete, make second request");       console.log(xmlhttp.responsetext);       makerequesttwo();     }   } }  function makerequesttwo(){   var xmlhttp;    xmlhttp = new xmlhttprequest();    xmlhttp.open("get","getcdr.php?r=2",true);   xmlhttp.send();    xmlhttp.onreadystatechange=function(){     if (xmlhttp.readystate==4 && xmlhttp.status==200){       console.log("request 2 complete");       console.log(xmlhttp.responsetext);     }   } }  makerequestone();

although example little verbose, intended more illustrate.


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