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Asked: 2026-06-11T10:16:28+00:00

I am using Ajax.BeginForm and wish to pass in parameters to the function called

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I am using Ajax.BeginForm and wish to pass in parameters to the function called with OnBegin. The following are two code snippets.

new AjaxOptions
{
   HttpMethod = "POST",
   UpdateTargetId = "DataEntrySummary",                
   OnBegin = "ValidateForm(11,55)"
}

function ValidateForm(minAge, maxAge) {return false;}

The parameters are passed in correctly to the ValidateForm function but the function always returns true.

If I take the parameters out and use

OnBegin = "ValidateForm()"
function ValidateForm() {return false;}

It works perfectly and returns false. Am I missing something or are parameters not allowed here or …

Puzzled of Oxford – thanks in advance.

PS – I cannot use C# Attributes and Unobtrusive validation for very good reasons (these are code snippets).

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1 Answer

  1. Editorial Team

    I’m not sure how the comment from CrazyCoderz relates, but it is linked some how.

    What I have found is that anything after the the function name causes the Ajax OBegin to return true. This includes OnBegin = “ValidateForm()”. [My error above on the brackets]

    I am now implementing a ‘work around’ – one of two – either write my own Ajax call or read the attributes from the test input element of the form to get the values I want. So, thanks CrazyCoderz for putting me on the track to a solution.

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