Question

I want to check if a textbox value is empty and also if the textbox is greater than 0 with IF OR function via Javascript.

My code is below:

if(qty != "" && qty <> "0"){

//

}

Where qty is the name and id of the HTML input field

THIS IS THE SOME PORTION FROM THE FULL UPDATED CODE.

    if(qty != "")
    {
if(/^\d+$/.test(qty.value)){
var value = parseint(qty.value, 10);
sizeID = document.getElementById("size" + colID + prodID).value;window.location = "/_nCartAddToBasket.asp?ProductID=" + prodID + "&ProductColourID=" + colID + "&ProductSizeID=" + sizeID + "&Qty=" + qty + "&fgID=" + fgID;
}else{
alert("You must enter a numeric value in the quantity field.");}
}else{
alert("You must enter a quantity before adding to your basket.");}
}

Answer 1

I edited your question a little in order to have it make some sense. Your text element cannot be both empty and greater than zero at the same time.

var qty = document.getElementById('qty');

if (/^\d+$/.test(qty.value)) {
  var value = parseint(qty.value, 10);
  // whatever ...
}

That makes sure that the value of the text element is a string of one or more digits.