c# - Adding bracket when key in a number -


let's have textboxa. when application runs, textboxa shown , user can enter number. wanted format user input red color font , enclose brackets.

example: if user enter '5', format input (5), red color.

how achieve that?

function format(input) {          var txtvalue = document.getelementbyid(input).value;         document.getelementbyid(input).value = "("+txtvalue+ ")"; document.getelementbyid(input).style="color:red;";       }

use above javascript function , call in textbox onchange="format(this);"


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