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how to stop browser back button using javascript
I am doing an online quiz app in php. I want to restrict the user from going back in an exam.
I have tried the following script but it stops my timer.
What should I do?
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What are best practices for validating email addresses on iOS 2.0
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Great but doesn't work on OS <3.0, because NSPredicate is not available.
– Felixyz
Oct 13 '09 at 12:58
4
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How do I declare and assign a variable on a single line in SQL
...char(max) = 'Man''s best friend';
You will note that the ' is escaped by doubling it to ''.
Since the string delimiter is ' and not ", there is no need to escape ":
DECLARE @var nvarchar(max) = '"My Name is Luca" is a great song';
The second example in the MSDN page on DECLARE shows the correc...
How to check null objects in jQuery
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what do you think about var _myDiv = $('#myDiv'); ... .... if(_myDiv.lenght) {...} produce exception.
– Nuri YILMAZ
Mar 8 '11 at 19:15
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pytest: assert almost equal
How to do assert almost equal with py.test for floats without resorting to something like:
7 Answers
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What Java ORM do you prefer, and why? [closed]
... over time, the database itself is probably going to last longer.
Yes, you do have stored procedures and user defined types (UDT's) in your legacy database. Your database-tool should support that.
There are many other good ORM's. Especially Hibernate or iBATIS have a great community. But if you're...
Pimpl idiom vs Pure virtual class interface
...dentity is important. Always passed by reference, never by "value". Often, doesn't make sense to "copy" instances of the class at all. When it does make sense, a polymorphic "Clone" method is usually more appropriate. Examples: A Socket class, a Database class, a "policy" class, anything that woul...
F12 no longer works in Visual Studio
... look at the all the ReSharper short cuts in the Goto sub menu Declaration doesn't have any assigned!
16 Answers
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How do I remove a property from a JavaScript object?
....log(obj.hasOwnProperty('myProperty')) // false
The delete operator does not directly free memory, and it differs from simply assigning the value of null or undefined to a property, in that the property itself is removed from the object. Note that if the value of a deleted property was a refe...
How do I reflect over the members of dynamic object?
...sed PCL library Dynamitey (which can be found in nuget), it works for ExpandoObjects and DynamicObjects that implement GetDynamicMemberNames and any other IDynamicMetaObjectProvider who provides a meta object with an implementation of GetDynamicMemberNames without custom testing beyond is IDynamicMe...