passing a textbox value to a javascript function asp.net -


i having little difficulty one. trying pass textbox value javascript function , undefined instead.

advice perhaps on how can variable function

<input type="image" runat="server" id="btnsearchfunction" src="images/searchicon.png" name="image" onclick="searchcontent();" width="16" height="20" /> <input type="hidden" name="searchvalue" value="<%#txtsearch.value %>" /> <input type="text" runat="server" id="txtsearch" name="searchvalue" class="input-medium search-query" placeholder="search ..."/>

and function trying pass to

function searchcontent() {     var txtboxvalue = $(this).parent().find("input[name='searchvalue']").val();     alert(txtboxvalue); }

how more direct:

var txtboxvalue = $('#txtsearch').val(); alert(txtboxvalue);

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