In performance testing, it is really important to simulate a realistic user path through an application. For example, randomly select an image link from a gallery or select a share from a share list. In such situations, you can use the LoadRunnerlr_paramarr_random function to select a random value from a captured parameter array. Similarly, you can also write a code to do the same.
Before you use the above function, you will need to use web_reg_save_paramfunction to capture all the ordinal values. This can be achieved by passing "ORD=ALL" into the function.
The following code demonstrates the use of lr_paramarr_random function. The code saves link Ids using web_reg_save_param function and then useslr_paramarr_random function to randomly select an Id value. The value is passed as a parameter in web_text_link function to navigate to the appropriate webpage.
Before you use the above function, you will need to use web_reg_save_paramfunction to capture all the ordinal values. This can be achieved by passing "ORD=ALL" into the function.
The following code demonstrates the use of lr_paramarr_random function. The code saves link Ids using web_reg_save_param function and then useslr_paramarr_random function to randomly select an Id value. The value is passed as a parameter in web_text_link function to navigate to the appropriate webpage.
Action()
{
//Capture all the Link IDs
web_reg_save_param("LinkID","LB=id=\"","RB=\" href=\"default.aspx?content=business_","ORD=ALL",LAST);
lr_start_transaction("VU01_01_Homepage");
web_browser("website",
DESCRIPTION,
ACTION,
"Navigate={WebsiteUrl}",
LAST);
lr_end_transaction("VU01_01_Homepage",LR_AUTO);
lr_think_time(10);
//Save a randomly selected ID to a Parameter
lr_save_string(lr_paramarr_random("LinkID"),"RandomLink");
//Printout the randomly selected parameter
lr_output_message("%s",lr_eval_string("{RandomLink}"));
//Navigate to the appropriate webpage associated to the ID
lr_start_transaction("VU01_02_RandomLink");
web_text_link("Links",
"Snapshot=t2.inf",
DESCRIPTION,
"Id={RandomLink}",
ACTION,
"UserAction=Click",
LAST);
lr_end_transaction("VU01_02_RandomLink",LR_AUTO);
web_browser("Sync",
"Snapshot=t3.inf",
DESCRIPTION,
ACTION,
"Sync",
LAST);
return 0;
}
Following is a screenshot of replay log, displaying the random id's selected for each iteration. It also displays the values captured using web_reg_save_param function. 
