Calling javascript function in webtest

Question

Hi,
I have to pass a parameter in webtest but that is not available in response to capture.
I can generate that value using a javascript function. But I have no idea how to pass a string to a javascript function and retreive a value from that function to use it in webtest.
Can somebody help me on this issue..


Thanks in advance
vv

Answer 1

Hi vv
 

Please take a look at Web tests work at the HTTP layer. Web test records communition between a browser and web server. During a web test, Javascript contained in the web page is not executed.

 

Sometimes we pass a parameter to a javascript function to compute a value, then the parameter is thrown away and the value is posted to the web server. When we record a web test, the value should be recorded as part of the web request. Visual Studio use  the recorded web requests to drive the web server.

 

If you are in a different situation, could you let us know why you want to invoke a javascript function in the web test? We might be able to find a better solution.

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Answer 2

Hi Bill,

The value is recorded in the webtest . It is sent in one of the requests as a form post parameter.
But the authentication is failing when the same value is passed to different users.( That value is generated by a java script file in the application using userID+Timestamp).

Answer 3

In this case, you can write a custom web request plug-in. In the PreRequest method of the plug-in, computer userID+Timestamp in the same way as Javascript does, then update the post parameter. For  example:

 

using System;

using System.Collections.Generic;

using Microsoft.VisualStudio.TestTools.WebTesting;

namespace RequestPluginNamespace

{

public class MyWebRequestPlugin : WebTestRequestPlugin

{

public string FormParameterName

{

get;

set;

}

public override void PreRequest(object sender, PreRequestEventArgs e)

{

FormPostHttpBody body = e.Request.Body as FormPostHttpBody;

if (body != null)

{

string newValue = string.Empty;

// Computer newValue.

for(int i=0;i<body.FormPostParameters.Count;i++)

{

if(body.FormPostParameters[i].Name==FormParameterName)

{

body.FormPostParameters[i].Value = newValue;

break;

}

}

}

}

}

}

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