a button is not desabled on select change

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Hi!

I want to change the behavior of a button on select change, it is working on select change of another an option chosen which is different of the select text in the dropdownlist .

In brief what I want is to disabled a button when you select select as an option not other...
once I select USA or Russia it is working fine but once I select Select again it is not working means it is not disabled the button.
This is the code I am using:

HTML:
======
<select id="ddl">
<option>Select</option>
<option>USA</option>
<option>Russia</option>
</select>
<input type='button' value='Send' id='SendId' disabled/>

C#

JQuery:
======
$(function(){
    $('#ddl').on("change", function(){
    var getSelectedtext= $("#ddl option:selected").text();
    var getFirsttext = $("#ddl option:first-child").text();
    if(getFirsttext)
    {
        $('#SendId').prop("disabled", false);
        alert(getSelectedtext);
    }
    else{
        alert(getSelectedtext);
        $('#SendId').prop("disabled", true);
    }
   });
});

you can also test it using jsfiddle I created
Can someone help!

Posted 23-Oct-13 3:23am

El Dev

Updated 23-Oct-13 3:45am

v3

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max_nowak · Answer 1 · 2013-10-23T04:46:00

Try this:

JavaScript

$(function(){
    $('#ddl').on("change", function(){
    var getSelectedtext= $("#ddl option:selected").val();
    var getFirsttext = $("#ddl option:first-child").val();

    var isDefault = $("#ddl option:selected").text() == $("#ddl option:first-child").text() ? true : false;

    console.log(isDefault);
    if(!isDefault)
    {
        $('#SendId').prop("disabled", false);
        alert(getSelectedtext);
    }
    else{
        alert(getSelectedtext);
        $('#SendId').prop("disabled", true);
    }
    //alert(gettext);
    //alert(getFirsttext);
});
});

Remark: good idea to post a fiddle;)