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Alert message when select dropdown value is empty

i have 4 dropdown options, where each dropdown depends on otherDropdown B value depends on Dropdown A, so by default the value of all Dropdown's will be set to noneWhen Dropdown A is selected some ...

UIButton: set image for selected-highlighted state

I set an images for button's states Normal,Highlighted and Selected, but when the button in selected state and I press/highlight it I didn't see my highlighted image but just grayed picture.Is it ...

Delete with Join in MySQL

CREATE TABLE `clients` ( `client_id` int(11), PRIMARY KEY (`client_id`));CREATE TABLE `projects` ( `project_id` int(11) unsigned, `client_id` int(11) unsigned, PRIMARY KEY (`...

How to style checkbox using CSS?

I am trying to style checkbox using the following: But, it is still displaying the default checkbox. ...

Re-entrant locks in C#

Will the following code result in a deadlock using C# on .NET? class MyClass { private object lockObj = new object(); public void Foo() { lock(lockObj){ Bar(); ...

jquery live hover

I'm using the following jquery code to show a contextual delete button only for table rows we are hovering with our mouse. This works but not for rows that have been added with js/ajax on the fly......

Parallel.ForEach() vs. foreach(IEnumerable.AsParallel())

Erg, I'm trying to find these two methods in the BCL using Reflector, but can't locate them. What's the difference between these two snippets?A:IEnumerable items = ...Parallel....

AngularJS : How do I switch views from a controller function?

I am trying to use the ng-click feature of AngularJS to switch views. How would I go about doing this with the code below?index.html

Grails vs Roo - why SpringSource is pushing two very similar technologies?

SpringSource (now VMWare) has two very similar technologies: Grails and Spring Roo. I have been using Grails, but I see that SpringSource is actively working on something that is a competitor for that ...