c# - how to get textbox value in gridview using javascript -

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i want textbox value within gridview using javascript. can't find out value. asp.net page.how can "txtgridname" value update button onclientclick?

asp.net code here : 

     <columns>       <asp:templatefield headertext="s.no">     <itemtemplate>                                                                            <%#container.dataitemindex+1 %>     </itemtemplate>      </asp:templatefield>     <asp:templatefield headertext="unit std">      <edititemtemplate>     <%--<asp:textbox id="txtloceditname" width="100%" runat="server" text='<%#(eval("loc_name").tostring()) %>' />--%>      <asp:dropdownlist id="drpgridunitstd" runat="server" text='<%#(eval("uom_standard").tostring()) %>'>     <asp:listitem text="a" value="a"></asp:listitem>     <asp:listitem text="i" value="i"></asp:listitem>                                                                                 </asp:dropdownlist>     </edititemtemplate>     <itemtemplate>     <asp:label id="lbllocation" runat="server" text='<%#(eval("uom_standard").tostring())%>' />     </itemtemplate>     </asp:templatefield>      <asp:templatefield headertext="unit name">      <edititemtemplate>     <asp:textbox id="txtgridname" width="100%" runat="server" text='<%#(eval("uom_ts_unit").tostring()) %>' />     </edititemtemplate>     <itemtemplate>     <asp:label id="lblgridname" runat="server" text='<%#(eval("uom_ts_unit").tostring()) %>' />     </itemtemplate>     </asp:templatefield>       <asp:templatefield headertext="dimension-1">     <edititemtemplate>     <asp:textbox id="txtgriddim1" width="100%" runat="server" text='<%#(eval("uom_dimension_1").tostring()) %>' />     </edititemtemplate>     <itemtemplate>     <asp:label id="lblgriddim1" runat="server" text='<%#(eval("uom_dimension_1").tostring())%>' />     </itemtemplate>     </asp:templatefield>      <asp:templatefield headertext="dimension-2">     <edititemtemplate>     <asp:textbox id="txtgriddim2" width="100%" runat="server" text='<%#(eval("uom_dimension_2").tostring()) %>' />     </edititemtemplate>     <itemtemplate>      <asp:label id="lblgriddim2" runat="server" text='<%#(eval("uom_dimension_2").tostring())%>' />     </itemtemplate>     </asp:templatefield>        <asp:templatefield headertext="dimension-3">     <edititemtemplate>        <asp:textbox id="txtgriddim3" width="100%" runat="server" text='<%#(eval("uom_dimension_3").tostring()) %>' />     </edititemtemplate>     <itemtemplate>     <asp:label id="lblgriddim3" runat="server" text='<%#(eval("uom_dimension_3").tostring())%>' />     </itemtemplate>     </asp:templatefield>      <asp:templatefield headertext="dimension-4">     <edititemtemplate>     <asp:textbox id="txtgriddim4" width="100%" runat="server" text='<%#(eval("uom_dimension_4").tostring()) %>' />     </edititemtemplate>     <itemtemplate>     <asp:label id="lblgriddim4" runat="server" text='<%#(eval("uom_dimension_4").tostring())%>' />     </itemtemplate>     </asp:templatefield>       <asp:templatefield headerstyle-cssclass="hidegridcolumn" itemstyle-cssclass="hidegridcolumn">     <itemtemplate>     <asp:hiddenfield id="hdnunit_id" value='<%#(eval("unit_id").tostring())%>' runat="server" /> </itemtemplate> </asp:templatefield>  <asp:templatefield headertext="options"> <edititemtemplate>                                                                                 <asp:imagebutton id="imgbtnupdate" commandname="update" runat="server" imageurl="~/common/icons/save-icon.png" tooltip="update" height="15px" width="15px" onclientclick="return update();"/>                                                                                 <asp:imagebutton id="imgbtncancel" runat="server" commandname="cancel" imageurl="~/common/icons/delete-icon.png" tooltip="cancel" height="15px" width="15px" />                                                                             </edititemtemplate>                                                                             <itemtemplate>                                                                                 <asp:imagebutton id="imgbtnedit" commandname="edit" runat="server" imageurl="~/common/icons/edit.png" tooltip="edit" height="15px" width="15px" />                                                                                 <asp:imagebutton id="imgbtndelete" commandname="delete" runat="server" imageurl="~/common/icons/delete.png" tooltip="delete" height="15px" width="15px" onclientclick="return del();" />                                                                             </itemtemplate>  </asp:templatefield>    </columns>      </asp:gridview>

javascript code follows : 

    function update()    {         var grid1 = document.getelementbyid("<%= gvunit.clientid %>");         (i = 1; < grid1.rows.length ; i++)          {             var cellvalue = grid1.rows[i].cells[1].value;             alert(cellvalue);         }      }

the problem client id following:

ct100_contentplaceholder_gridid_rowid_rowindex_textboxid

something that. , can't uniquely identified. since grid works 1 edit though, find easier. since aren't using jquery, it's little more complicated. maybe if add cssclass="gridtextbox" textbox control , use getelementsbyclassname:

var tb = document.getelementsbyclassname('gridtextbox');

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