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What are valid values for the id attribute in HTML?

When creating the id attributes for HTML elements, what rules are there for the value? 23 Answers ...
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CodeIgniter activerecord, retrieve last insert id?

Are there any options to get the last insert id of a new record in CodeIgniter? 11 Answers ...
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Android OnClickListener - identify a button

...public class Mtest extends Activity { Button b1; Button b2; public void onCreate(Bundle savedInstanceState) { ... b1 = (Button) findViewById(R.id.b1); b2 = (Button) findViewById(R.id.b2); b1.setOnClickListener(myhandler1); b2.setOnClickListener(myhandler2); ... } Vi...
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Put buttons at bottom of screen with LinearLayout?

... You need to ensure four things: Your outside LinearLayout has layout_height="match_parent" Your inside LinearLayout has layout_weight="1" and layout_height="0dp" Your TextView has layout_weight="0" You've set the gravity properly on your inner LinearLayout: android:...
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How to express a NOT IN query with ActiveRecord/Rails?

...this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci. 15 Answers ...
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The key must be an application-specific resource id

... The tag id must be unique so it wants it to be an id created in a resources file to guarantee uniqueness. If the view will only contain one tag though you can just do setTag(objContact.onlineid); ...
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Check if object value exists within a Javascript array of objects and if not add a new object to arr

... I've assumed that ids are meant to be unique here. some is a great function for checking the existence of things in arrays: const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }]; function ad...
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What is the difference between id and class in CSS, and when should I use them? [duplicate]

Here I gave an id to the div element and it's applying the relevant CSS for it. 15 Answers ...
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When use getOne and findOne methods Spring Data JPA

... TL;DR T findOne(ID id) (name in the old API) / Optional<T> findById(ID id) (name in the new API) relies on EntityManager.find() that performs an entity eager loading. T getOne(ID id) relies on EntityManager.getReference() that perform...
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How to find largest objects in a SQL Server database?

...ceMB FROM sys.tables t INNER JOIN sys.indexes i ON t.object_id = i.object_id INNER JOIN sys.partitions p ON i.object_id = p.object_id AND i.index_id = p.index_id INNER JOIN sys.allocation_units a ON p.partition_id = a.container_id WHERE t.name NOT LIKE 'dt%' AND i.o...