How to access a javascript variable in c# code behind without using a hidden field

Question

I am storing the data in a variable and passing that to the txt_val attribute, stored as 'tooltip'. I want to access this in my c# code, how can I do it?

function closediv(val1, txt_val, grp) {
    var data = val1.split("!~!");
    var value1 = data[0];
    $("#" + txt_val).attr('tooltip', value1);            
}

I know it can be done using a hidden field, but this value is checked for multiple textbox controls, so if I use a hidden field control, I would need to use one hidden field for each textbox, that would result in a lot of repeated code. Is there a better way I can do it? Thank you

You want to send data from client side back to server side? Why you don't use form posting or calling an ajax to send data to back-end? — Afshar
– Afshar, Commented Dec 13, 2017 at 5:51
I mean you finally want to send all data in addition to txt_val back to server, right? If yes you can send all of them at once. An example for form posting is using form element: <form method="post" action="test"> — Afshar
– Afshar, Commented Dec 13, 2017 at 5:59
@AfsharMohebbi yes I want to send all data in addition to txt_val, but can you let me know how to do this? I already have <form method="post" action="test"> in my code — Sumedha Vangury
– Sumedha Vangury, Commented Dec 13, 2017 at 6:15
Yes, I see. Here we need to use hidden fields that you originally wanted to avoid... — Afshar
– Afshar, Commented Dec 13, 2017 at 6:18

Vipin Kumar · Accepted Answer · 2017-12-13 06:29:06Z

1

You can create an Object containing values from all the 'textbox` controls and add it to your hidden field by converting it to JSON, like below

var extraData = {};

function closediv(val1, txt_val, grp) {
  var data = val1.split("!~!");
  var value1 = data[0];
  $("#" + txt_val).attr('tooltip', value1);
  extraData[txt_val] = value1;
  $('#hiddenFieldId').val(JSON.stringify(extraData));
}

then on the controller, you can use JSON.net deserialise this JSON.

ExtraData extraDataObj = JsonConvert.DeserializeObject<ExtraData>(extraData);

Also, if you want to capitalize first letter of the object while serilizing the extraData, then you can use solution from here.

answered Dec 13, 2017 at 6:29

Vipin Kumar

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