validation - Using Required Expression and Required Field Validators in ASP.NET -
i having trouble validating use inputs once calculate button clicked. appreciated. text fields must validated using validation controls , should include summary show errors. error messages appear in lblmessage.text nothing showing once calculate clicked. (side note: cannot clear button reset textboxes null. great too)
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<body> <form id="form1" runat="server"> <div> <img src="images/header.jpg" alt="get fit" title="getfit" width="100%"/> </div> <h1>body mass index calculator</h1> <table align="center"> <tr> <td class="auto-style4">enter first name:</td> <td class="auto-style6"> <asp:textbox id="txtname" runat="server" tabindex="1"></asp:textbox> </td> <td class="auto-style5"> </td> <td class="auto-style7"> </td> </tr> <tr> <td class="auto-style4">enter age: </td> <td class="auto-style6"> <asp:textbox id="txtage" runat="server" tabindex="2"></asp:textbox> </td> <td class="auto-style5"> </td> <td class="auto-style7"> <asp:comparevalidator id="cv" runat="server" controltovalidate="txtage" type="integer" operator="datatypecheck" errormessage="enter valid age" >*</asp:comparevalidator> </td> </tr> <tr> <td class="auto-style4">enter email: </td> <td class="auto-style6"> <asp:textbox id="txtemail" runat="server" tabindex="3"></asp:textbox> </td> <td class="auto-style5"> </td> <td class="auto-style7"> <asp:regularexpressionvalidator id="regularexpressionvalidator3" runat="server" controltovalidate="txtemail" display="dynamic" errormessage="enter valid email" validationexpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">*</asp:regularexpressionvalidator> </td> </tr> <tr> <td class="auto-style4">enter height: </td> <td class="auto-style6"> <asp:textbox id="txtheight" runat="server" tabindex="4"></asp:textbox> </td> <td class="auto-style5"> <asp:label id="lblheight" runat="server" text="inches"></asp:label> </td> <td class="auto-style7"> <asp:requiredfieldvalidator id="requiredfieldvalidator1" runat="server" controltovalidate="txtheight" display="dynamic" errormessage="you must enter valid height">*</asp:requiredfieldvalidator> </td> </tr> <tr> <td class="auto-style4">enter weight:</td> <td class="auto-style6"> <asp:textbox id="txtweight" runat="server" tabindex="5"></asp:textbox> </td> <td class="auto-style5"> <asp:label id="lblweight" runat="server" text="pounds"></asp:label> </td> <td class="auto-style7"> <asp:requiredfieldvalidator id="requiredfieldvalidator2" runat="server" controltovalidate="txtweight" display="dynamic" errormessage="you must enter valid weight">*</asp:requiredfieldvalidator> </td> </tr> <tr> <td colspan="4"> <asp:label id="lblmessage" runat="server" text="label"></asp:label> </td> </tr> </table> <br /> <table align="center"> <tr> <td class="auto-style2"> <asp:button id="btncalculate" runat="server" text="calculate bmi" align="center" tabindex="6"/> <span style="color:darkblue;">|</span> <asp:button id="btncancel" runat="server" text="cancel" align="center" tabindex="7"/> </td> </tr> </table> <br /> <table align="center"> <tr> <td> <h1>your bmi:</h1> </td> </tr> <tr> <td> <asp:textbox id="txtbmi" runat="server" readonly="true" tabindex="8"></asp:textbox> </td> </tr> <tr> <td> <h2>this means are: </h2> </td> </tr> <tr> <td> <asp:textbox id="txtresults" runat="server" readonly="true" tabindex="9"></asp:textbox> </td> </tr> </table> </form> </body> aspx.vb
partial class _default inherits system.web.ui.page public sub clearall() txtname.text = "" txtage.text = "" txtemail.text = "" txtheight.text = "" txtweight.text = "" end sub protected sub btncancel_click(byval sender system.object, byval e system.eventargs) handles btncancel.click clearall() 'txtname.text = string.empty 'txtage.text = string.empty 'txtemail.text = string.empty end sub private sub btncalculate_click(byval sender system.object, byval e system.eventargs) handles btncalculate.click calculate() end sub public sub calculate() 'name if txtname.text = string.empty lblmessage.text = "please enter name." else end if 'age if txtage.text = string.empty lblmessage.text = "please enter age." else end if 'email if txtemail.text = string.empty lblmessage.text = "please enter email." else end if 'height if txtheight.text = string.empty lblmessage.text = "please enter height." else end if 'weight if txtweight.text = string.empty lblmessage.text = "please enter height." else end if dim result double ' declare "result" double. dim rounded_result double result = txtweight.text / (txtheight.text * txtheight.text) * 703 ' bmi calculation. rounded_result = math.round(result, 1) ' round result 1 decimal place. txtbmi.text = rounded_result.tostring ' display bmi using lblbmi. bmi_message(rounded_result) 'send rounded bmi result sub bmi_message. end sub public sub bmi_message(byval bmi_value double) select case bmi_value case 0.0 18.5 txtresults.text = "underweight" case 18.6 24.9 txtresults.text = "normal weight" case 25.0 29.9 txtresults.text = "overweight" case >= 30.0 txtresults.text = "obese" case else txtresults.text = "unable determin bmi" end select end sub end class
try ...
private sub btncalculate_click(byval sender system.object, byval e system.eventargs) handles btncalculate.click page.validate() if page.isvalid calculate() end sub and in clear button tag should add causevalidation="false"
<asp:button id="btncancel" runat="server" causevalidation="false" text="cancel" align="center" tabindex="7"/> hope helps....
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