Need help with Dropdown list: How to pick latest value from dropdown.

srini

we have a bunch of dropdowns on the web page. All these dropdown items are having numeric (Ex: 800,809,818 etc...) values and strings. Here i need to count the values from the dropdown and have to pick max value in the dropdown. Hey this is urgent. Please help me out.

sahi_tester

Hi,

Please elaborate with an example.

narayan

<browser>
function getMaxOption(selectEl){
   var opts = selectEl.options; // get the options
   var values = []; // blank array
   for (var i=0; i<opts.length; i++){
      var num = parseInt(opts[i].value); // get the integer value of string
      if ("" + num != "NaN")  // check if it is a number and add to array
          values[values.length] = num;
   }
   return values.sort(function(a,b){return a-b;}).pop(); // sort it ascending numerically and return last value.
}
</browser>

_alert(getMaxOption(_select("myDropDown"))); // Should alert the max number in this dropdown.

More info on javascript sorting

srini

Hi Nayaran,

We have an internal application LMS in this application we are having 2 pages those are Leave Application and Leave Modification Request. After successful requesting a Leave one number will be generated (Leave Request No) and this will be available in the Leave Modification Request page under Leave Request No dropdown. Here I want to select Leave Request No which was requested earlier means latest Leave Request No from Leave Request No dropdown list.

Note: we don’t know the latest Leave Request No until unless selecting the dropdown list in the Leave Modification Request page.

narayan

Srini,

Did you try the code in my previous reply? I think if you do

_setSelected(_select("leaveReqNo"),  ""+getMaxOption(_select("leaveReqNo")));

it should work. Change "leaveReqNo" to the identifier of your select box.

Regards,
Narayan

srini

Hi Narayan,

i have tried with the following but i am getting null value. i am not getting dropdown list max value.

function GetMaxValueInDropDown($selectEl)
{
var opts = $selectEl.options; // get the options
var $values = []; // blank array

for (var $i=0; $i<$opts.length; $i++)
{
var $num = parseInt($opts[$i].value); // get the integer value of string

if ("" + $num != "NaN") // check if it is a number and add to array
{
$values[$values.length] = $num;
}
}

return values.sort(function($a, $b){return $a - $b;}).pop(); // sort it ascending numerically
and return last value.

_alert($values);

_setGlobal("LeaveRequestDDMaxValue", $values[0]);
}

srini

Hi sahi_tester

We have an internal application LMS in this application we are having 2 pages those are Leave Application and Leave Modification Request. After successful requesting a Leave one number will be generated (Leave Request No) and this will be available in the Leave Modification Request page under Leave Request No dropdown. Here I want to pick Leave Request No which was requested earlier means latest Leave Request No from Leave Request No dropdown list.

Note: we don’t know the latest Leave Request No until unless selecting the dropdown list in the Leave Modification Request page.

narayan

Srini,

Are the options in the dropdown visible as numbers when you look at them? If yes, there is a small change needed in the function.

Btw, you have to use the code as is. No need for modifications. Remember to use the browser tags for that function.

<browser>
function getMaxOption(selectEl){
   var opts = selectEl.options; // get the options
   var values = []; // blank array
   for (var i=0; i<opts.length; i++){
      var num = parseInt(opts[i].text); // get the integer value of displayed string
      if ("" + num != "NaN")  // check if it is a number and add to array
          values[values.length] = num;
   }
   return values.sort(function(a,b){return a-b;}).pop(); // sort it ascending numerically and return last value.
}
</browser>

// This will set the select box with the option with maximum displayed value.
_setSelected(_select("leaveReqNo"),  ""+getMaxOption(_select("leaveReqNo")));

Regards,
Narayan

srini

Thanks Narayan..... now i am able to pick max dropdown value....Thanks for your support.....