c# - Using onChange Event in ASP.NET combined with Bootstrap -


i wanna create 2 textareas. first textarea should used user. every time user change textarea value should checked , given out in textarea. tried add runat="server" , onchange="ftextchanged" in bootrstrap textarea control. usercontrol:

<div class="row">  	<div class="form-group">  		<label for="totranslate">text translate:</label>  		<textarea class="form-control" runat="server" onchange="ftextchanged" rows="5" id="totranslate"></textarea>  	</div>  </div>    <div class="row">  	<div class="form-group">  		<label for="translatedtext">translated text:</label>  		<textarea class="form-control" runat="server" rows="5" id="translatedtext"></textarea>  	</div>   </div>

and codebehind:

public void ftextchanged(object sender, eventargs e) {     string content = totranslate.value;     translatedtext.value = content; }

i tried debug it, appears compiler(website?) ignore function. vs2017 dont stop @ breakpoint:

content = totranslate.value;

i'm new in web programming @ all, i'm used c#, c++, , labview. hope nice guys can me.

kind regards!

edit:
changing:

<textarea class="form-control" runat="server" onchange="ftextchanged" rows="5" id="totranslate"></textarea>

to:

<asp:textbox class="form-control" id="totranslate" runat="server" ontextchanged="ftextchanged" autopostback="true" textmode="multiline" rows="5"></asp:textbox>

worked pretty well.

if want on client side use onchange event javascript code follows

function keyup()  {          var totranslate = document.getelementbyid("totranslate");          var s = totranslate.value;                var translatedtext = document.getelementbyid("translatedtext");          translatedtext.innertext = ""+s;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>        <div class="row">          <div class="form-group">              <label for="totranslate">text translate:</label>              <textarea class="form-control" runat="server" rows="5"  id="totranslate" onkeypress="keyup()" onkeyup="keyup()"></textarea>          </div>      </div>        <div class="row">          <div class="form-group">              <label for="translatedtext">translated text:</label>              <textarea class="form-control" runat="server" rows="5"  id="translatedtext"></textarea>          </div>       </div>

if should use server-side code however, transform html control asp.net control follows find server-side events on asp.net controls (not sure, check it);

<asp:textbox id="totranslate" runat="server" ontextchanged="ftextchanged" autopostback="true" clientidmode="static"  textmode="multiline" rows="5"></asp:textbox>

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