function doStuff(event) {
    console.log(typeof (event.target.value), event.target.value, event.target.value.match(/^\d*$/))
    if (event.target.value.match(/^[\d\.]*$/)) {
        var tradDogAge = event.target.value * 7
        $("#result").empty().append("<br>Traditionally your dogs age would be: " + tradDogAge + "</br>")
        var newDogAge = ((16 * Math.log(event.target.value)) + 31).toFixed(2)
        $("#result").append("<br>Under this new method your dogs age is: " + newDogAge + "</br>");

    } else {
        $("#result").html("a number is the only option")
    }
}

function Init() {
    var textarea = document.getElementById("textarea");

    if (textarea.addEventListener) {    // all browsers except IE before version 9
        textarea.addEventListener("input", OnInput, false);
        // Google Chrome and  Safari
        textarea.addEventListener("textInput", OnTextInput, false);
        // Internet Explorer from version 9
        textarea.addEventListener("textinput", OnTextInput, false);
    }

    if (textarea.attachEvent) { // Internet Explorer and Opera
        textarea.attachEvent("onpropertychange", OnPropChanged);   // Internet Explorer
    }
}

// Google Chrome, Safari and Internet Explorer from version 9
function OnTextInput(event) {
    doStuff(event)
}
// Firefox, Google Chrome, Opera, Safari from version 5, Internet Explorer from version 9
function OnInput(event) {
    doStuff(event)
    //        $("#result").html(event.target.value)
    //$("#result").html().replace(event.target.value)
}



// Internet Explorer
function OnPropChanged(event) {
    if (event.propertyName.toLowerCase() == "value") {
        alert("The new content: " + event.srcElement.value);
    }
}

appenddata('hello')