c# - Imagebutton causing __dopostback event of some other javascript -

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i have gridview in asp.net webforms page imagebuttons inside updatepanel jquery ui slider buttons , textboxes pass values slider. i'm using following script slider: 

        $(function () {             var lvalue = $(".lbllrating").text();             var rvalue = $(".lblhrating").text();             $("#slider-range").slider({                 range: true,                 min: 0,                 max: 5,                 values: [lvalue, rvalue],                 slide: function (event, ui) {                // showcurrenttime();                 // $(".txtrng1").trigger("change");                     $(".txtrng1").val(ui.values[0]);                     var lval = $(".txtrng1").val();                     // if conditions                     $(".txtrng2").val(ui.values[1]);                     var rval = $(".txtrng2").val();                     // if conditions                      //document.getelementbyid("<%= btnapplywt.clientid %>").click();                   $('#<%= btnapplywt.clientid %>').trigger('click');                     __dopostback("btnapplywt_click", "onclick");                 }             });             $(".txtrng1").val($("#slider-range").slider("values", 0));             $(".txtrng2").val($("#slider-range").slider("values", 1));             var lval = $(".txtrng1").val();             // if conditions             }         });

asp.net controls

    <asp:button id="btnapplywt" runat="server" cssclass="btn btn-primary pull-right"       onclick="btnapplywt_click" style="display: none;"></asp:button>         <asp:textbox id="txtrng1" runat="server" cssclass="pull-right txtrng1" ontextchanged="ontxt_textchanged"         autopostback="true" style="display: none;"></asp:textbox>   <asp:textbox id="txtrng2" runat="server" cssclass="pull-right txtrng2" ontextchanged="ontxt_textchanged"       autopostback="true" style="display: none;"></asp:textbox>

this working fine expected.

however, main issue imagebuttons inside gridview. while clicking on image button inside gridview, ontxt_textchanged event being called instead of imagebutton click event @ first click. imagebutton click event working fine until full postback (refresh page manually).

anyone has idea what's going wrong? please let me know if need provide additional details.

the following 2 line cause ontextchanged event fired before onclick.

$(".txtrng1").val($("#slider-range").slider("values", 0)); $(".txtrng2").val($("#slider-range").slider("values", 1));


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