WebVerifyData Function


Parses the server response data and counts the appearance of the specified content with the provided string. If the verification condition is not met, an error is raised. The severity of this error can be specified. The appearance count of the specified content can be retrieved by an optional out-parameter. A subsequent low-level web function will not return a value until the request has finished. A cache hit is not performed unless the WEB_FLAG_DONT_FORCE_LOAD option is set. The verification is done even if this option is set and the verified request or a certain part of a page is a cache hit.

When verifying/parsing an HTML page that consists of multiple frames (HTML documents), you can specify which frame document to verify/parse by specifying the nDocNum parameter. By default (1) the top document (e.g. a frameset) is scanned. This applies to HTML pages that are retrieved through a page-level command like WebPageUrl or WebPageLink.

It is important to know that all parsing and verification functions must be specified before the Web API call for which the response data should be parsed/verified. You can specify multiple parse/verification functions before a Web API call. The order of the parse/verification functions is not relevant (Exception: WebParseDataBound and WebVerifyDataBound using the flag WEB_FLAG_SYNCHRON).

This verification feature can be enabled/disabled globally (Profile Settings / Web / Verification / Data / Data verification).

Note: This function can be added automatically to your script using the visual verification functionality of TrueLog Explorer.

Include file



WebVerifyData( in  sVerify     : string,
               in  nAppearance : number optional,
               in  nOptions    : number optional,
               in  nDocNum     : number optional,
               in  nSeverity   : number optional := SEVERITY_ERROR,
               out nResult     : number optional ) ;
Parameter Description
sVerify String to compare with the parsed HTML content.
nAppearance Value to which the actual appearance of the specified content string is compared (see nOptions)(optional). If this parameter is omitted, the specified string must appear at least once to meet the verification rules.


The verification succeeds if the actual appearance is equal to nAppearance.
The verification succeeds if the actual appearance is greater than nAppearance.
The verification succeeds if the actual appearance is smaller than nAppearance.
If this flag is set the string compare operation is case sensitive.
If this flag is set all white spaces are ignored.
Specify this option to enable caching for subsequent requests. Note that this may lead to unpredictable behaviour, because the verification may only cover certain parts (which are loaded) of a page.
If this flag is specified all server responses are scanned (even redirection responses, which are normally not displayed by a browser).
If this flag is specified, even embedded documents can be specified by the nDocNum parameter. Normally the number of a document is defined by the occurrence of the source definition in an HTML document (src=...). If this flag is specified every embedded object increases this counter, which assigns higher numbers to subsequent frames.
If this flag is specified the response header can also be verified.
If this flag is specified only the response header is verified.
Specify this flag to perform the verification on every subsequent web function. Verification functions with this flag are usually located in the TInit transaction. Call WebCancelAllRules() to disable all verification rules.
Note: The option WEB_FLAG_RULE should only be used in the INIT transaction or in combination with the WebCancelAllRules function!
nDocNum Specifies the document to verify (optional). Specify WEB_DOC_ALL if you want to verify all documents. If this parameter is omitted, the first document gets verified. (see the above definition of FLAG_INCLUDE_EMBEDDED)
nSeverity Optional: Severity of the error that is raised if the verification fails. Can be one of the following values:
  • SEVERITY_SUCCESS: Success; no error (numerical value: 0)
  • SEVERITY_INFORMATIONAL: Informational; no error (numerical value: 1)
  • SEVERITY_WARNING: Warning; no error (numerical value: 2)
  • SEVERITY_ERROR: (Default) Error; simulation continues (numerical value: 3)
  • SEVERITY_TRANS_EXIT: Error; the active transaction is aborted (numerical value: 4)
  • SEVERITY_PROCESS_EXIT: Error; the simulation is aborted (numerical value: 5)
nResult If a variable is provided, it will receive the number of appearances of the specified content string (optional).


  transaction TMain
    nResult: number;
    WebVerifyData("<a href=sun.gif");
    WebVerifyData("<b>Begin</b>", 0, 0, 0, SEVERITY_WARNING);
    WebVerifyData("Shop</a>", 2, WEB_FLAG_EQUAL | WEB_FLAG_GREATER);
  end TMain;