Error: Unable to get value of the property 'length:' object is null or undefined

Question

I have this error in my WebBrowser

Error: Unable to get value of the property 'length:' object is null or undefined

even though I have this code:

CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).ScriptErrorsSuppressed = True

Why am I getting this and how do I get rid of it?

Answer 1

If you are creating the Webbrowser componenet dynamically, I suggest that you set ScriptErrorsSurpressed = True at that point.

Dim wb as New WebBrowser
wb.ScriptErrorsSurpressed = True
'Other declarations...

If it is not created dynamically, then I suggest that you go to the control and manually change the setting to True in the design view.

If this doesn't work, please refer to my request/comment on your original post.

EDIT 1

This is your code:

Dim Browser As New WebBrowser 
TabControl1.TabPages.Add("New Page") 
Browser.Name = "Web Browser" 
Browser.Dock = DockStyle.Fill 
TabControl1.SelectedTab.Controls.Add(Browser) 
AddHandler Browser.ProgressChanged, AddressOf Loading 
AddHandler Browser.DocumentCompleted, AddressOf Done 
int = int + 1 
CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).GoHome()
CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).ScriptErrorsSuppressed = True

This is how I would write it:

Dim Browser As New WebBrowser 
Browser.Name = "Web Browser" 
Browser.Dock = DockStyle.Fill 
AddHandler Browser.ProgressChanged, AddressOf Loading 
AddHandler Browser.DocumentCompleted, AddressOf Done 
TabControl1.TabPages.Add("New Page") 
TabControl1.SelectedTab.Controls.Add(Browser)
int = int + 1 
Browser.GoHome()
Browser.ScriptErrorsSurpressed = True

I see no need for CType() at all.

Answer 2

您收到错误是因为 yts/bin 文件夹中http://s.ytimg.com服务器上的 javascript 文件 (www-home-vflVATumV.js) 有错误或发现任何 LENGTH 属性的动态错误它试图评估的对象。