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Editorial Team
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Asked: 2026-05-31T12:33:41+00:00

This is the Javascript Function. Please Explain How to compare two string in Javascript.

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This is the Javascript Function. Please Explain How to compare two string in Javascript. 

   <head>
    <script type="text/javascript">
/*javascript function*/ 
    function ajax(str)
    {
    if (str.length==0)
      {
      document.getElementById("res").innerHTML="";    
      return;
      }
      if(str=="Select City")
      {
      alert("Please Select a City");
      }
    document.getElementById("res").innerHTML=="";
    var url="code1.php?q="+str+"&r"+Math.random();
    var obj;
    try{
    obj=new ActiveXObject(Microsoft.XMLHTTP);
    }
    catch(e)
    {
        try
        {
        obj=new XMLHttpRequest();
        }
        catch(e)
        {
        alert("Your browser not suport ajax");
        }
    }
    obj.open('Get',url,true);
    obj.send(null);
    obj.onreadystatechange=function()
    {
    if(obj.readyState==4)
    {
    document.getElementById("res").innerHTML=obj.responseText;
    }
    }
    }
    </script>
    </head>

    <body>

    <select onchange="ajax(this.value)" name="sel" id="btn"><option>Dharmashala</option><option>Manali</option><option>Shimla</option></select>
    <div id="res"></div>
    </body>
    </html>

But it does not work please suggest me a proper method to do this.

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1 Answer

  1. Editorial Team

    I’m pretty sure it’s not working because you have your this context incorrect. this.value is trying to call the value of your select element instead of the selected option. Try this:

    window.addEventListener('load', function(){
  var select = document.getElementById('btn');
  var selected = select.options[select.selectedIndex].value;
}, false);
window.addEventListener('change', function(selected) { changeHandler(selected); }, false);

function changeHandler(selected) {
  // run your ajax() function
}

    Also, be sure to put a value on each of your option elements.

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