Checkbox Checker!

[ChloeJacobs]

Hi All,

I was wondering if i would be able to create a checkbox checker usign VB!

All I want is a small form that has one button and when you click the button it will check all the chekboxes on the webpage that I am viewing?

Is this possible?!

Thanks guys,
Chloe ~X~

[Pradeep1210]

I think the best way to accomplish this would be using javascript, since there is nothing meaningful to be done at server.

Anyways you can do from VB (code behind) too:

Sub CheckAll(ByVal checked As Boolean)
    For Each cont As Control In Me.Controls
        If TypeOf cont Is CheckBox Then
            CType(cont, CheckBox).Checked = checked
        End If
    Next
End Sub

Pradeep

[NickThissen]

I think what he means is that he wants to create a program that checks every checkbox on a webpage that is on a separate browser (firefox, IE) outside of his control... No?

[ChloeJacobs]

Hi Nick,

Thanks for explaining this better for me! Thats exactly what i mean.

What about if i include a web browser within my form and then the button that checks the checkboxes only has to check the boxes in the web page that is opened within my windows form?

Can this be done?

Oh by the way i'm a Girlly! :P

Thanks,
Chloe~X~

[ChloeJacobs]

Hi Guys,

Here's the code that worked for me:

For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", "true")
            End If
        Next

Thanks,
Chloe~X~

[Pradeep1210]

It's easy. Though I might not be able to give you exact code at present, here are the steps to follow which are very easy. There are many code samples on this forum on how to get the document object and traverse the DOM tree.

1. Add a webbrowser control to your form.
2. Load the webpage into the webbrowser control.
3. Get a reference to the Document object of the loaded webpage.
4. Traverse the DOM tree to find all checkboxes and tick them.

EDIT: Aaahh!! I was looking at the cached page and didn't see the last post. Glad you resolved it yourself

Pradeep

[ChloeJacobs]

Hi Every1,

I am using the below code to check all the checkboxes on a website that is laoded within the webbrowser control in my form:

For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", "true")
            End If
        Next

Does any1 know how i can amend this so that when i click the check button for a second time it will uncheck all the records? So basically if the button is clicked it will do the opposite to what the checkbox status currently is? i.e if it's checked then clicking the button will uncheck it, if it is unchecked then clicking the button will check it?

Thanks,
Chloe ~X~

[Pradeep1210]

Maybe something like this:

Private Sub CheckUncheckAll(ByVal newState As String)
        For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", newState)
            End If
        Next
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If Button1.Text = "Check All" Then
            CheckUncheckAll("true")
            Button1.Text = "Uncheck All"
        Else
            CheckUncheckAll("false")
            Button1.Text = "Check All"
        End If
    End Sub

[ForumAccount]

Maybe I misunderstood but from what I understand she wants the inverse of property to be set.

So if she has 3 checkboxes where their state is: true, true, false it switches to false, false, true. Is this correct?

This is untested as I don't deal with webrowsers, but I assume you can do this:

Private Sub InverseChecked()
        For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                If input.GetAttribute("checked") = "true" Then
                    input.SetAttribute("checked", "false")
                Else
                    input.SetAttribute("checked", "true")
                End If
            End If
        Next
    End Sub

[ChloeJacobs]

Hi Guys,

Thank you for your responses but i couldn't get either code to work for me?

ForumAccount is correct, if the checkbox is checked, then clicking the Check button will uncheck the checkbox and if the checkbox is not checked, clicking the Check button will check the checkbox?

This is bugging me now!
Thanks
Chloe ~X~

[ChloeJacobs]

Hey guys,

I just viewed the source of the webpage with the checkboxes on and ticked a few checkboxes and left some unchecked and there is no difference in the Input tags? Do you think this could be why this isn't working?

Thanks,
Chloe ~X~

[su ki]

you are using javascript version or doing this stuff on server ??

if you are doing this at server side you have to call your function which check or uncheck checkboxes in prerender event of page's life cycle

[ChloeJacobs]

Hi Su ki,

I have a web browser control in my windows form.

Could you please explain a little further about the prerender event of the page's life cycle? I dont know what this means?

Thanks,
Chloe ~X~

[Pradeep1210]

What exactly is not working with code in post #8/#9 ?

[ChloeJacobs]

Hi Pradeep,

With post #8 when i clicked the button it did not check the checkboxes.

With post #9 when i clicked the button it checked the check boxes, but when i clicked it again to uncheck the checkboxes it did not work.

Thanks,
Chloe ~X~

[ForumAccount]

For Pradeep's code, did you make sure you changed the text of the button to "Check All"? (Even though it shouldn't matter after 2 clicks.) Did you debug? Is it calling his function?

For mine, the code is supposed to make the check state the opposite of what it is. Have you debugged through and seen what is happening on the If statement?

[ChloeJacobs]

Hi,

I just tried Pradeeps code again and it checked all the boxes and the lbel change name correctly but it still didn't uncheck the checkboxes when it was click a second time?

How do i debug through it? It must have called the function to check the checkboxes?

Thanks again,
Chloe ~X~

[ForumAccount]

Place a breakpoint on the line you want code execution to stop on with F9. The code will run up until that red line, then you need to press F8 to step through each line. There's good debugging tutorials online that show you how to add watches, writing to the immediate window etc...

Edit: do you have a sample url I can run tests on as well?

[ChloeJacobs]

Hi,

Thanks i'll try that now.

However, i just tried adding a serparate button uncheck the checkboxes using the below code, but when i click the button it checks the checkboxes instead of unchecking them!!

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", "false")
            End If
        Next
    End Sub

Why is this?

Thank you,
Chloe ~X~

[stanav]

Hi,

I just tried Pradeeps code again and it checked all the boxes and the lbel change name correctly but it still didn't uncheck the checkboxes when it was click a second time?

How do i debug through it? It must have called the function to check the checkboxes?

Thanks again,
Chloe ~X~

Your program doesn't know how many times a button has been clicked automatically unless you have code to keep track of the clicks. In your case, this is very simple. You can use the Tag property of the button to store the information you need. For example, you initially store a boolean value of True to the button's tag. When the user clicks it, you set the checkboxes value to the value of the button's tag, and then change the button's tag to the opposite of what it currently is.

[ChloeJacobs]

Hi Stanav,

That sounds a bit to complicated for me! Could you please show me an example of how to do that?

I just tried debugging this code:

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", "false")
            End If
        Next
    End Sub

And it skips over this line of code:

input.SetAttribute("checked", "false")

Should it be skipping this line?

thanks,
Chloe ~X~

[stanav]

Try something like this

 Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim btnTag As Object = Me.Button2.Tag
        Dim value As Boolean = True
        If btnTag IsNot Nothing Then
            value = CBool(btnTag)
        End If
        Me.SetAllCheckBoxes(value)
        Me.Button2.Tag = Not value
    End Sub

    Private Sub SetAllCheckBoxes(ByVal value As Boolean)
        For Each input As HtmlElement In Me.WebBrowser1.Document.GetElementsByTagName("input")
            If input.GetAttribute("type") = "checkbox" Then
                input.SetAttribute("checked", value.ToString.ToLower())
            End If
        Next
    End Sub

[ChloeJacobs]

Hi stanav,

Thank you for posting this code, but for some reason the checkboxes are still not unchecking?

Do you think it is down to the website and not the code?

Thanks,
Chloe ~X~

[Pradeep1210]

Can you provide a sample file on which you are running the code?