Summary of solutions to the "sys undefined" error in Ajax

Error: The "sys undefined" error occurs when customizing scripts in Ajax applications.
Solution 1: Obtain the pagerequestmanager instance statement (for example, var prm = SYS. webforms. pagerequestmanager. getinstance ();
) In the function.
Solution 2: Place the JS Code after the scriptmanager control definition.
Cause Analysis: Put the scriptmanager control in the body.
JavaScript code is placed before the scriptmanager control.
Because HTML is loaded row by row.
Because var PRM = SYS. pagerequestmanager. getinstance ();
It was called before loading the JS Code of the scriptmanager control,
So there is a situation where sys is undefined.

Solution 3:

Add

<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>

Solution 4:

If "system. Web. Extensions. dll" is referenced, it will be OK.

The Web. config configuration is as follows:

<? XML version = "1.0"?>
<! --
Note: In addition to manually editing this file, you can also use
Web management tools to configure application settings. You can use
"Website"-> "ASP. NET configuration" option.
The complete list of settings and comments is displayed in
In machine. config. Comments, this file is usually located in
\ Windows \ Microsoft. NET \ framework \ v2.x \ config
-->
<Configuration xmlns = "http://schemas.microsoft.com/.NetConfiguration/v2.0">
<Deleetask>
<Add key = "crystalimagecleaner-autostart" value = "true"/>
<Add key = "crystalimagecleaner-sleep" value = "60000"/>
<Add key = "crystalimagecleaner-Age" value = "120000"/>
</Appsettings>
<Connectionstrings>
<Add name = "dynetdata" connectionstring = "Data Source = 192.168.7.10; initial catalog = dynet; persist Security info = true; user id = dynetuser; Password = nmamtf" providername = "system. data. sqlclient "/>
</Connectionstrings>
<System. Web>
<! --
Set compilation DEBUG = "true" to insert debugging symbols
Compiled pages. However, this
Affects performance. Therefore, you must set this parameter only during development.
This value.

Visual Basic options:
Setting strict = "true" will disable all
Type conversion of data loss.
Setting explicit = "true" forces the declaration of all variables.
-->
<Authorization>
<Allow users = "? "/>
</Authorization>
<Httpruntime executiontimeout = "160" type = "codeph" text = "/codeph"/>
<Sessionstate timeout = "120"/>
<Compilation DEBUG = "true" strict = "false" Explicit = "true">
<Assemblies>
<Add Assembly = "system. Design, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
<Add Assembly = "system. Windows. Forms, version = 2.0.0.0, culture = neutral, publickeytoken = b77a5c561934e089"/>
<Add Assembly = "system. Data. oracleclient, version = 2.0.0.0, culture = neutral, publickeytoken = b77a5c561934e089"/>
<Add Assembly = "system. Management, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
<Add Assembly = "crystaldecisions. Web, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. Shared, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. reportsource, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. Enterprise. Framework, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. Enterprise. desktop. Report, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. crystalreports. Engine, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. Enterprise. infostore, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "crystaldecisions. reportappserver. clientdoc, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304"/>
<Add Assembly = "system. Web. Extensions, version = 1.0.61025.0, culture = neutral, publickeytoken = 31bf3856ad364e35"/>
<Add Assembly = "system, version = 2.0.0.0, culture = neutral, publickeytoken = b77a5c561934e089"/>
<Add Assembly = "system. Web, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
<Add Assembly = "system. configuration, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
<Add Assembly = "system. XML, version = 2.0.0.0, culture = neutral, publickeytoken = b77a5c561934e089"/>
<Add Assembly = "system. Drawing, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
<Add Assembly = "system. Data, version = 2.0.0.0, culture = neutral, publickeytoken = b77a5c561934e089"/>
<Add Assembly = "system. Drawing. Design, version = 2.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/> </assemblies>
<Buildproviders>
<Add extension = ". rdlc" type = "Microsoft. Reporting. rdlbuildprovider, Microsoft. reportviewer. Common, version = 8.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a"/>
</Buildproviders>
</Compilation>
<Pages>
<Namespaces>
<Clear/>
<Add namespace = "system"/>
<Add namespace = "system. Collections"/>
<Add namespace = "system. Collections. Specialized"/>
<Add namespace = "system. Configuration"/>
<Add namespace = "system. Text"/>
<Add namespace = "system. Text. regularexpressions"/>
<Add namespace = "system. Web"/>
<Add namespace = "system. Web. Caching"/>
<Add namespace = "system. Web. sessionstate"/>
<Add namespace = "system. Web. Security"/>
<Add namespace = "system. Web. Profile"/>
<Add namespace = "system. Web. UI"/>
<Add namespace = "system. Web. UI. webcontrols"/>
<Add namespace = "system. Web. UI. webcontrols. webparts"/>
<Add namespace = "system. Web. UI. htmlcontrols"/>
</Namespaces>
</Pages>
<! --
In the <authentication> section, you can configure
Security Authentication mode,
To identify the user.
-->
<Authentication mode = "NONE"/>
<! --
If an unprocessed error occurs during request execution,
You can configure the corresponding processing steps in the <mermerrors> section. Specifically,
This section allows developers to configure
HTML error page to be displayed
To replace the error stack trace.

<Customerrors mode = "remoteonly" defaultredirect = "genericerrorpage.htm">
<Error statuscode = "403" Redirect = "noaccess.htm"/>
<Error statuscode = "404" Redirect = "filenotfound.htm"/>
</Customerrors>
-->
<Httphandlers>
<Add Path = "crystalimagehandler. aspx "verb =" get "type =" crystaldecisions. web. crystalimagehandler, crystaldecisions. web, version = 10.2.3600.0, culture = neutral, publickeytoken = 692fbea5521e1304 "/>
<Add Path = "Reserved. reportviewerwebcontrol. axd "verb =" * "type =" Microsoft. reporting. webforms. httphandler, Microsoft. reportviewer. webforms, version = 8.0.0.0, culture = neutral, publickeytoken = b03f5f7f11d50a3a "Validate =" false "/>
<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 = "get" Path = "scriptresource. axd" type = "Microsoft. Web. Handlers. scriptresourcehandler" Validate = "false"/>
</Httphandlers>
</System. Web>
</Configuration>