javascript - How disable RequiredFieldValidator in script - Stack Overflow

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I have TextBox with RequiredFieldValidator on my page. I also have link that calls some simple javascript.

<asp:TextBox ID="TextBox1" runat="server" />
<asp:RequiredFieldValidator
ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox1"
Display="Dynamic" /> 
<asp:LinkButton   ID="Link1" runat="server" OnClientClick="DoSomething(); return false;" CausesValidation="false"Text="Do" />

function DoSomething() {
textbox1.val("blah"); }

When user type something into textbox and then delete that text and focus next control - then validator fires. Then user can use link that adds text using javascript. TextBox1 text is no longer empty but RequiredFieldValidator still shows error message. How to prevent that?

I have TextBox with RequiredFieldValidator on my page. I also have link that calls some simple javascript.

<asp:TextBox ID="TextBox1" runat="server" />
<asp:RequiredFieldValidator
ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox1"
Display="Dynamic" /> 
<asp:LinkButton   ID="Link1" runat="server" OnClientClick="DoSomething(); return false;" CausesValidation="false"Text="Do" />

function DoSomething() {
textbox1.val("blah"); }

When user type something into textbox and then delete that text and focus next control - then validator fires. Then user can use link that adds text using javascript. TextBox1 text is no longer empty but RequiredFieldValidator still shows error message. How to prevent that?

• javascript
• asp
• validation

Share Improve this question Follow edited Jul 2, 2011 at 19:02 Muhammad Akhtar 52.2k3737 gold badges139139 silver badges191191 bronze badges asked Apr 22, 2010 at 8:47 jlpjlp 10.4k1616 gold badges5656 silver badges7575 bronze badges

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3 Answers 3

Sorted by: Reset to default 6

you can use javascript ValidatorEnable function

ValidatorEnable(document.getElementById('<%= ValidatorID.ClientID %>'), true);

I would remend a CustomValidator here since you do NOT want the normal RequiredFieldValidator behavior. The CustomValidator client method will only run on postback.

The whole point of the validators is that they are to be used for both server side and client side validation.

If you only want to validate on the server side, don't use a validator and simply check that the values are valid and report an error.

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