Question

I’m using below javascript to set value to cell in a tabular form.

<script type="text/javascript">
function eventListener(pThis)
{

$('input[name="f04"]').change(function(){

var that = this;
var vRow = "f10_"+pThis.id.substr(pThis.id.indexOf('_')+1);

$.post("wwv_flow.show", 
       {p_request      : "APPLICATION_PROCESS=GET_AMOUNT",
        p_flow_id      : $v("pFlowId"),
        p_flow_step_id : $v("pFlowStepId"),
        p_instance     : $v("pInstance"),
        x01            : $(this).val()
        },
        function(data){ 
              $('input[id="f10_0002"]').val(data);
        },
        "text"
      );
});

}
</script>

I need to use value in var vRow instead of f10_0002 in $('input[id="f10_0002"]').val(data);.

I have tried with $('input[id=vRow]').val(data); and $('input[id='"'+vRow+'"']').val(data);

But doesn’t work. javascript is not worked in these situations. but $('input[id="f10_0002"]').val(data); is worked.

how could i use value in var vRow for this ?

Answer 1

While using the selector input[id=value] is technically right (because of the jQuery attribute selector), it isn’t necessary. The main reason is because you’re targeting an element by ID. Javascript has a special method that is especially fast, which I’m sure jQuery uses internally ( document.getElementById ) when you specify you’re selecting by ID. To trigger the selection of an element by ID, you can use the # character at the beginning of the selector string. Since you are trying to use the value of a variable as well, you can concatenate "#" and vRow, like:

$("#" + vRow).val(data);

# is the equivalent of matching an element by ID. If you look at the jQuery selectors page ( http://api.jquery.com/category/selectors ), you’ll see there are several special characters to help with selecting elements. As I said, # is for ID…. is for class, etc. So instead of having jQuery parse the string “input[id=value]” and do a lot of extra processing, you can help jQuery do it more efficiently by simply using #.