When Ajax is used in Asp.net, the error "'sys 'undefined" is returned.

Use aspx.net todayAjaxThe modalpopup control in is used to refresh some pages. However, an error message is displayed when you debug the program"Sys"UndefinedIn Baidu Google, you need to add a configuration on the Web. config page. The Code is as follows:

<Location Path ="Scriptresource. axd">
<System. Web>
<Httphandlers>
<Remove verb = "*" Path = "*. asmx"/>
<Add verb = "*" Path = "*. asmx "Validate =" false "type =" Microsoft. web. script. services. scripthandlerfactory, Microsoft. web. extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 "/>
<Add verb = "*" Path = "* _ appservice. axd "Validate =" false "type =" system. web. script. services. scripthandlerfactory, system. web. extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 "/>
<Add verb = "Get, head" Path ="Scriptresource. axd"Type =" system. Web. Handlers. scriptresourcehandler, system. Web. Extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 "Validate =" false "/>
</Httphandlers>
</System. Web>
</Location>

After the increase, the error is eliminated. Haha!

By the way, you can add additional knowledge and extend it to the WebService method.

WebService MethodUndefinedSolution:

Add the following code to Web. config:

<Httphandlers>
<Remove verb = "*" Path = "*. asmx"/>
<Add verb = "*" Path = "*. asmx" Validate = "false" type = "system. Web. Script. Services. scripthandlerfactory"/>
<Add verb = "Get, head" Path ="Scriptresource. axd"Type =" system. Web. Handlers. scriptresourcehandler, system. Web. Extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35 "Validate =" false "/>
</Httphandlers>