Ms Access #error Subform
of Use Forms: #Error when the Subform has no records Author(s) Keri Hardwick Here are some facts about #ERROR returned when a subform has no records:In these examples, [Subf field] refers to a syntactically correctreference to a subform field from a main form. 1. It will not evaluate to null: IsNull([Subf field]) is false 2. It will evaluate to an error on the main form, but not when passeto a global module: IsError([Subf field]) on the main form evaluates to true IsAnError([Subf field]) returns false, where this function exists in a global module: Function IsAnError(testvalue as variant) as Boolean IsAnError = IsError(testvalue) End Function 3. It will not evaluate to numeric. IsNumeric([subf field]) evaluates to false. I have found this to be the best test, since often it is a total or other number being passed back to the main form. If not, there is usually some numeric field on the sub that can be tested whether or not it is the field used on the main form. This test indicates when there are records, IsNumeric will be true; when there are no records, IsNumeric will be false. So, you can catch "no records" and display what you want instead of #ERROR. This function returns zero instead of #ERROR when used like this:nnz([Subf field]) on the main form. I use it from a global module. '***************** Code Start *************** 'This code was originally written by Keri Hardwick. 'It is not to be altered or distributed, 'except as part of an application. 'You are free to use it in any application, 'provided the copyright notice is left unchanged. ' 'Code Courtesy of 'Keri Hardwick ' Function nnz(testvalue As Variant) As Variant 'Not Numeric return zero If Not (IsNumeric(testvalue)) Then nnz = 0 Else nnz = testvalue End If End Function '***************** Code End **************** © 1998-2010, Dev Ashish & Arvin Meyer, All rights reserved. Optimized for Microsoft Internet Explorer
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GUI Design GUI Design Examples Submit Your Examples Resources Resources Database News Knowledge Base Microsoft Access Products, Tools & Add-In's Online Shop UK Visitors US Visitors Info Contact Us Advertise With Us Link To Us Write For Us Competitions Subform Totals and Mainforms Displaying Subform Totals in a Main Form in Microsoft Access In this article we are going to show you how to display totals taken from your subform, and display these in controls in your main form. We need to be able to reference the subform control from the main Microsoft Access form. If you attempt to sum a subform field by using a calculated control on a main form, you may receive an error message in the main form control. For example, the following expression in a main form control generates a "#Error" error message: =Sum(sfrmAlbumTracks.Form!txtLength) We can see this in use on the following form, where we would like to show the Total Album Length on our main form by calculating the sum of the tracks displayed in the subform. The control with the error has been highlighted: The form containing the calculated control, which is attempting to sum the values from the subform To get around this problem, and to avoid returning an error with our calculation, we can sum the subform field by using a calculated control placed in the subform's form footer. If we do not wish to display this control, as we will be returning the result in the main form, we can set the controls property to Visible: No. We can then reference the calculated control from the main form to display the summed value. See this article over at The Access Web for details of Referring to Form and Subform Properties and Controls To solve this problem, we first add a calculated control in the footer of our Subform, which sums the subform's Track Length field to create a subtotal. It uses the following syntax: =Sum([Length]) We can see this in the image shown below: The subform, containing the calculated control within the form footer We have named this control txtTotalTrackLengths and also set the control properties to Visible: No Now, a textbox control on our main form refers