Change textbox value in javascript

Question

I want to update the value of text box from where I'm getting initial value to add product to cart. Now I'm applying round function & I want to update the value of text box that is because I'm using ajax & if I'm applying round function, user must know how system calculated everything.

Here's my simple code:

<script>
$(document).ready(function(){
$(document).delegate('.purchasenow','click', function(e){
    var buynow=this;
    var productid = $(this).attr('id');
    var quantity = $('.quo_'+productid).val();
    var quantity = Math.round(quantity);
    alert(quantity); //This gives the value
    $('.quo_'+productid).value = quantity; //This is not working
});
});

Can anyone tell why it's not working? It's very simple but I'm not able to find out the cause.

Answer 1

Have you tried

$('.quo_'+productid).val(quantity);

The jQuery selector returns a wrapped object, not the actual DOM element. I don't think wrapped object has the .value property

Answer 2

you are almost correct the only thing why it is not working because your syntax is wrong

this is the correct syntax for jQuery

$('.quo_'+productid).val(quantity);

if you want it in javascript

var txt = document.getElementById("quo_"+productid);
txt.value = quantity;