jquery detect if to use .live .delegate or .on

readme

// example usage

switch(checkVersion())
{
    case 1:
        signup_form.live("submit", false);
        break;
    case 2:
        signup_form.delegate("submit", false);
        break;
    case 3:
        signup_form.on("submit", false); // Shorthand for "return false" function()
        break;
}


switch(checkVersion())
{
    case 1:
        signup_form.die("submit");
        break;
    case 2:
        signup_form.undelegate("submit");
        break;
    case 3:
        signup_form.off("submit");
        break;
}

checkVersion.js

function checkVersion()
{
    // jQuery 1.3+    .live
    // jQuery 1.4.3+  .delegate
    // jQuery 1.7+    .on
    var vernums = $.fn.jquery.split('.');
    if(vernums.length >=2 )
    {
        // if there is no 3rd param set to zero
        if(vernums.length == 2) vernums[2] = 0;
        if(parseInt(vernums[0]) == 1)
        {
            //1.3.0 - 1.4.2
            if( (parseInt(vernums[1]) == 3 && parseInt(vernums[2]) >= 0) || (parseInt(vernums[1]) == 4 && parseInt(vernums[2]) < 3) ) {
                // use live/die
                return 1;
            } else if ( (parseInt(vernums[1]) == 4 && parseInt(vernums[2]) >= 3) || (parseInt(vernums[1]) >= 5 && parseInt(vernums[1]) <= 6) || (parseInt(vernums[1]) == 7 && parseInt(vernums[2]) == 0) ) {
                // use delegate
                return 2;
            } else {
                // use on/off
                return 3;
            }
        } else {
            // anything greater than 1 try on/off
            return 3;
        }
    } else {
        // can't parse version try use on/off
        return 3;
    }
}