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What's the (hidden) cost of Scala's lazy val?
One handy feature of Scala is lazy val , where the evaluation of a val is delayed until it's necessary (at first access).
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How do I drop a foreign key constraint only if it exists in sql server?
I can drop a table if it exists using the following code but do not know how to do the same with a constraint:
10 Answers
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Scroll to a div using jquery
...n the side. I'd like to scroll to the different divs. Basically the page is just one long website, where I'd like to scroll to different divs using the menu box to the side.
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SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
...inner join QuestionAnswers a
on q.AnswerID = a.AnswerID
where q.QuestionID is null -- and other conditions you might want
I recommend to check what the result set to update is before running the update (same query, just with a select):
select *
from QuestionTrackings q
inner join QuestionAnswers ...
How to pass arguments to a Button command in Tkinter?
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edited May 4 '15 at 0:43
nbro
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How to get the HTML for a DOM element in javascript
... avoid having to remove and reinsert the element in the actual document. This might be expensive if the element you wish to print has a very large tree below it, though.
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How to stop EditText from gaining focus at Activity startup in Android
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Excellent answers from Luc and Mark however a good code sample is missing. Adding the tag android:focusableInTouchMode="true" and android:focusable="true" to parent layout (e.g. LinearLayout or ConstraintLayout) like the following example will fix the problem.
<!-- Dummy item to prev...
Calendar.getInstance(TimeZone.getTimeZone(“UTC”)) is not returning UTC time
...ndar.getInstance(TimeZone.getTimeZone("UTC")) method call, it's returning IST time.
6 Answers
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How to force Chrome's script debugger to reload javascript?
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While you are developing your script, try disabling the Chrome cache.
When you reload the page, the JavaScript should now get refreshed.
Chrome circa 2011
Chrome circa 2018
You can also access it on the network tab:
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PHP session lost after redirect
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First, carry out these usual checks:
Make sure session_start(); is called before any sessions are being called. So a safe bet would be to put it at the beginning of your page, immediately after the opening <?php declaration before anything else. Also ensure there are no whitespaces/tab...