Combo Box Null Problem
Aug 2, 2005
Hello!
Looks like a grate forum for access topics and thats exactly what I need now! I'm new to Access and are going grazy!!
I'm trying to add some functions to an excisting database that someone else has done.
The Form creates an report from an db containing a one per day status information from water and electrical meters. Filling in start and stop dates gives a nice report over all meters and their status.
Now I want to add a combo box so the user can select one meter or leaving it empty to get all meters. I can make it work when selecting one meter in the list, but leaving it empty shows none. Or selecting any don't help all of the meters shows up anyway.
I used the search engine on this forum and found similar problem, but couldn't figure it out. Tried many combinations of the IIF statement, but didn't help.
Please help me!!
/Anttu
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Apr 3, 2008
I am having problems with setting up a set of combo boxes.
What I am trying to do is if combo Productline is empty then in combo PartNumber would show all products but if combo Productline has a value selected then in the combo partnumber would only be able to select the partnumbers in that productline.
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Apr 25, 2007
I have field in my table, which is required (in access, or not allow null sql server), and have defaults of 0.
I have a form with a combo box bound (thru query) to this field - how do I let the user choose something from the list and then decide they actually didn't want to choose anything - and so clear the list.
Hear I get an error saying the field cannot accept null - how do I just force it to accept 0 - ie no choice??
Thanks
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Feb 11, 2006
Hello All,
I’m using a combo box for the criteria for a saved query. Is there any way to show all the records if the combo box value is either “0” or null?
Thanks,
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Jul 30, 2007
I have a form that using a combo box to select specific record, sometimes we need to see all records, i would like if the combo box if left empty to return all records. I typed this expression but it returns no records when combo box is empty.
IIf([Forms]![FrmReports]![LoanOfficer]="IsNull","*",[Forms]![FrmReports]![LoanOfficer])
If i use this expression i get the wrong results when a Loan Officer ID is enterd;
LIke([Forms]![FrmReports]![LoanOfficer] & *
Example of wrong results, if Loan officer Id is 1, then it returns loan officers 1,11, 111
Thanks in advance for any help
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Sep 22, 2013
Windows vista
Access 2007
I can't seem to figure out how to test a combo box null value.I try:
Code:
If IsNull(Me.cboManufacturer) Then
MsgBox ("Please select category")
Else
DoCmd.OpenReport "rptItemCategory", acViewPreview
End If
This works if the combo box IS NOT NULL, but if null it gives me:
PHP Code:
Run-time error '3071': This expression is typed incorrectly, or it is too complex to be evaluated.Â
For example, a numeric expression may contain too many complicated elements.Â
Try simplifying the expression by assigning parts of the expression to variables.Â
I then tried:
Code:
If IsNull(Me.cboManufacturer.Column(0)) Then
MsgBox ("Please select category")
Else
DoCmd.OpenReport "rptItemCategory", acViewPreview
End If
This works if the combo box IS NULL but if i've made a selection, it still gives me the message box as if I've selected nothing....
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Apr 1, 2014
We just upgraded to Office 2010 from 2003 and I am now getting 'invalid use of null' after choosing a valid combo box option. When I debug, the line that highlights has to do with a text box on the form rather than the combo box. Here's the code highlighting:
frmLines = Me.WorkLoadUnit
This is the code in it's entirety.
Private Sub fsubProductivityInput_Calculations()
On Error GoTo err
'Calculate Breaks and Net Hours
Dim frmLines As Double
Dim frmHours As Double
Dim frmLPH As Double
[code]....
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Jun 25, 2015
I have a combo box in a form which simply pulls a text field from a single table - approximately 100 values to choose from. On the After Update Event, there is a basic "If null this, else that" VBA which just hides a subform if the value is null. This works fine, except there are a handful of values (I've found at least 6) that when chosen, trigger the NULL portion of the code! All the values are very similar, so I don't know what the problem is - for example, the value "D-11" works, but neither "D-10" nor "D-12" does.
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Jun 1, 2014
I have a form, form1. Inside there is a combo box, cbo1, that gets its values from table1.On form load, I want an expression that checks if table1 has any values to "send" to cbo1. If yes, meaning, if after form loads cbo1 is loaded with table1's values, I want cbo1 colored RED, if not, colored WHITE.
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Sep 12, 2013
I have a main form with multiple combo boxes that filter a subform datasheet. In my main form combo box [PR_Filter] I added a selection titled "<Blanks>". When I select "<Blanks>", I want it to filter my subform field [PR] for NULL values. If I select anything else I want it to filter on that selection. I cannot get the NULL filter to work.
Here is the code that I have (Red is the field I need the NULL values):
Private Function PurchaseFilter()
Dim strFilter As String
Dim bFilter As Boolean
bFilter = False
strFilter = ""
[Code] ....
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Mar 25, 2015
I want to pass the Combobox value of one form to a textbox on another using the where condition. Using the break in VBA, the value of the combobox (in this instance "two") shows as null. the control of the combobox is [cboSubCategory] and I want it's value to pass to another form "tblCategoriesSub" (aware of the incorrect reference, as used wizard quickly - but will change if I can get it to work) to the "SubCategory" field.
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Mar 14, 2013
I am assigning a recordset using vbs code. The variable "CB_proj" is a combobox value. The problem comes when the combobox is null, the program errors out and even if I try to exit the routine with an if statement, it still compiles the line of code and errors out because the object doesn't exist. how I can get it to not compile that error if my combo box value is null?
CB_proj = Forms!CC_MAIN.CB_proj
strSQL = "SELECT " & [CB_proj] & ".* FROM " & [CB_proj] & ";"
Forms!CC_MAIN.projdat.Form.RecordSource = strSQL
Forms!CC_MAIN.projdat.Form.Requery
Forms!CC_MAIN.Form.Requery
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Aug 27, 2014
I have a SQL Server 2005 backend table with a varchar(1) field which allows nulls. The field is populated from a combo box in Access 2012. The field can be set to 1,2 or 3 via the combo box or left blank in which case its value will be null. Sometimes I need to reset this field to null. How can I do this via a combo box? I know I could just set this to an empty string but this would mean re-writing a load of queries which a looking for a number or null.
Something like 1;"First";2;"Second";3;"Third";Null;"Blank"
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Aug 5, 2013
On a form, I want to disable the save button, 'cmdSave' whilst the form's mandatory fields have been left blank.
I've put in a smart tag, called, 'Req' against each required field and have used the following code on the forms current event.
Code:
Private Sub Form_Current()
Dim ctl As Control
For Each ctl In Me.Controls
If ctl.ControlType = acTextBox Or ctl.ControlType = acComboBox Or ctl.ControlType = acListBox Then
[Code] ....
The save button is disabled, but it won't enable again after each field has data entered against it.
I also have this code in the AfterUpdate event in each required field:
Code:
Private Sub cboErrorID_AfterUpdate()
Call Form_Current
End Sub
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Nov 16, 2014
I do not understand what is happening here. I have foll0wing line in a calculated query field:
m: Switch([EmpID]<5,1) ' run Query 18 in attached example, A2007/2010
this produces 1 for all EmpID<5 and Null for all other EmpID's. All as expected.
But if I do this:
m: Switch([EmpID]<5,1,[EmpID]>=5,Null) ' run Query 19 in attached example
then the entire column is set to Null
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Jul 5, 2013
It might be an easy one but I just wasted the past hour deciphering through my code in order to solve the run-time error '94' that I'm getting when trying to execute the following code:
Code:
Private Sub cmdUpdateDates_Click()
'###################################
'This sub aims at combining the timesheet date and the start and end time into the fields [Start Time] and [End Time].
'###################################
Dim intCounter As Integer
intCounter = 0
Dim rs As ADODB.Recordset
[Code] ....
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Apr 18, 2006
Hello all,
A bit of a weird one, I've got a query and the criteria for showing records is that one particular field is null. However the query is showing records with the values in the field chosen for the Is Null.
Not sure why this is happening, has anyone come across this problem before?
Thanks.
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Nov 16, 2006
Hi, I have some problem with assigmnet with date and string variable. what i wana do is get data from Forms textboxes into variable and then by insert query send to history table.
the problem occurs when there is blank textbox its says invalid use of null.
e.g
myStringVariable = Forms!myform!EmpName
myDateVariable = Forms!myform!EmpDOB
this code is behind the update button which i press when ever i want to shift data to History table
so when the fields are empty the invalid use of null error arrise
any idea how to handle this null specially in date
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Nov 16, 2007
I think the title pretty much sums it up....
I have a query where data is first sorted by user input; first field's criteria: [fieldname], then by another field's criteria: Is Null.
I know there are records containing null values in the second field, as I have run a select query with the criteria: Like "*", to make sure they are null, and not zero-length-strings.
The query is refusing to return any results...
Any ideas?
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Aug 5, 2013
I have several comboboxes (6) on my form.How to populate these comboboxes with values depending on selected value in previous combobox.
Example.Lets say that you select value "Audi" in combobox 1, then available values in combobox 2 should be "A4","A6","TT" etc. and if you selected "BMW" in combobox 1, then available values in combobox 2 should be "3-series", "5-series" etc...
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Mar 31, 2014
I have a form that currently uses a "catch all" table for listing available equipment to choose from for an equipment field. I call it tblEquipment. What I want to do is to make it so when I type a name in (1 of 35) in one field of the current record, the record source for the equipment field immediately looks at a different table that has equipment available only for that name. To do this I plan on making 35 different tables with limited data originally found in tblEquipment. I would call these tblEquipment1, tblEquipment2, etc. I do not use a sub form, nor do I want to.
So my questions are:
1) can this be done
2)If it can be done, how can I do it?
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Oct 20, 2005
Hi everyone,
I have two combo boxes on the same form bound to a table. I want the contents of the next combo box to change based on the previous combo selection e.g
cboContinent cboCountry
Africa Zambia
Africa Congo
Africa South africa
Europe England
Europe Holland
If I choose Africa in cboContinent, I want to see only Zambia, South Africa and Congo under cboCountry and if I choose Europe I want to see only England and Holland
Thanks
Humphrey
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Apr 27, 2013
I have a Suppliers database which contains a form that will allow me to place orders with Suppliers.The Main form has a combo box that allows me to select the supplier. The combo box is called SupplierID with the following:
Row source: SELECT Suppliers.SupplierID, Suppliers.CompanyName FROM Suppliers ORDER BY Suppliers.CompanyName;
The subform is called Stock Subform witha combo box called ProductID with the following:
Row source: SELECT DISTINCT Products.ProductID, Products.ProductName, Suppliers.CompanyName, Products.Discontinued FROM Suppliers INNER JOIN Products ON Suppliers.SupplierID=Products.SupplierID WHERE (((Products.Discontinued)=0)) ORDER BY Products.ProductName;
Event Procedure - AfterUpdate: Private Sub ProductID_AfterUpdate()
On Error GoTo Err_ProductID_AfterUpdate
Dim strFilter As String
' Evaluate filter before it's passed to DLookup function.
strFilter = "ProductID = " & Me!ProductID
[code]..
The Link fields are done on the Purchase Order ID (PONoID).What I want to achieve is to select the supplier from the combo box (SupplierID) on the main form and then the combo box (ProductID) on the subform to filter to only show products directly supplied by the Supplier selected on the Main Form.
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May 21, 2014
I'm looking for a way to have a text box auto fill based on the selection of a combo box on the same form. I cannot use the method i find all over the internet of using multiple columns in the combo box and basing the text box on that because the combo box already has multiple columns being used to determine its own possibilities and other combo box possibilities.
I would really just like the text box to work like this, but im still kinda inexperienced in VBA...
If combo box is "F004-001", then text box is "237"
If combo box is "F004-003", then text box is "280"
I know how to add in an "after update" thing, but i do not know how to do If/then statements.
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Jul 11, 2012
I'm have quite a difficult time getting a form in Access 2010 to perform the way I would like it to. I have multiple tables that I've created, and a query that contains the data from the various tables. I then ran the form wizard to select the data from the query that I wanted to populate in my form and I've added 2 combo boxes.
What I want to do:
1. I want users to be able to select a category in combo box #1 (example: "Bag")
2. I want users to be able to select a detail in combo box #2 based on the category they selected in combo box #1 (example: Combo box #1, "bag" would populate the following selections for combo box #2: "sandwich" and "tool")
3. I want users to then receive a list of suppliers that provide the product they have selected, either "Bag: Sandwich" or "Bag: Tool"
I have combo box #1 populating a list of categories already. However, I am not able to get combo box #2 to provide choices based on the selection chosen for combo box #1.
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Mar 11, 2012
Let's assume we have 3 tables:
Order_Category (Order_Category_ID, Order_Type_Name) with 2 records:
1, Minor
2, Major
Order_Type (Order_Category_ID, Order_Type) with 4 records:
1, Book
1, Pencil
2, Car
2, House
Orders (Order_Category_ID, Order_Type, value) with 2 records:
1, NULL, NULL
1, NULL, NULL
2, NULL, NULL
I want to create a Multiple Items form presenting Orders table with two Combo Boxes:
1. A combo box to select Order_Category_ID.
2. A combo box to select Order_Type. When 1 (Minor) is chosen in the first combo box it should show Book and Pencil, when 2 (Major) is chosen it should show Car and House.
Examples in the Internet show how to do it on a 'single row' forms using the RowSource property. I tried to use a query like:
SELECT Order_Type
FROM Order_Type
INNER JOIN Orders ON Order_Type.Order_Category_ID = Orders.Order_Category_ID
WHERE Order_Category_ID = [comboBoxOrderCategoryID]
But it sets same values for all records in the Multiple Items form and it should return different values in each rows based on value in the first combo box (Order_Category_ID).
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