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HTML text input allow only numeric input
...x, inputFilter) {
["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop"].forEach(function(event) {
textbox.addEventListener(event, function() {
if (inputFilter(this.value)) {
this.oldValue = this.value;
this.oldSelectionStart = this.selecti...
How to remove elements from a generic list while iterating over it?
...
Select the elements you do want rather than trying to remove the elements you don't want. This is so much easier (and generally more efficient too) than removing elements.
var newSequence = (from el in list
...
What is this 'Lambda' everyone keeps speaking of?
... without bloating your code unnecessarily. For example, in Ruby:
(1..100).select {|num| num % 2 == 0}
This will create an array containing the even numbers between 1 and 100. We don't have to write out an explicit loop — the select method takes a function that it uses to test the values, so all...
JPA EntityManager: Why use persist() over merge()?
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I noticed that when I used em.merge, I got a SELECT statement for every INSERT, even when there was no field that JPA was generating for me--the primary key field was a UUID that I set myself. I switched to em.persist(myEntityObject) and got just INSERT statements then...
SSRS chart does not show all labels on Horizontal axis
...your groups in a particular order, you need to specify it in the report:
Select the chart,
In the Chart Data popup window (where you specify the Category Groups), right-click your Group and click Category Group Properties,
Click on the Sorting option to see a control to set the Sort order
For th...
App Inventor 2 拖拽物体教程 - 按住移动与碰撞检测 · App Inventor 2 中文网
...
when 画布1.TouchUp(x, y) {
正在拖拽 = false
var 目标位置X = select(目标X, 当前拖拽索引)
var 目标位置Y = select(目标Y, 当前拖拽索引)
var 距离 = sqrt((x - 目标位置X) ^ 2 + (y - 目标位置Y) ^ 2)
if 距离 < 吸附距离 {
图像精灵1.X = 目标位...
Virtualizing an ItemsControl?
...the sort of thing I was looking for! I was looking for a different kind of selection behavior than a listbox and at the time I thought it would be easiest to do with an items control.
– Rachel
May 7 '10 at 12:20
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How can I use grep to show just filenames on Linux?
...andard:
-l
(The letter ell.) Write only the names of files containing selected
lines to standard output. Pathnames are written once per file searched.
If the standard input is searched, a pathname of (standard input) will
be written, in the POSIX locale. In other locales, standard i...
Does Foreign Key improve query performance?
...the foreign key relationship already inforces that for you.
So this:
select p.ProductId, p.Name, c.CategoryId, c.Name AS Category
from Products p inner join ProductCategories c on p.CategoryId = c.CategoryIdwhere c.CategoryId = 1;
Becomes this:
SELECT p.ProductId, p.Name, c.CategoryId, c.N...
How to map a composite key with JPA and Hibernate?
... way you write queries (making them more or less verbose):
with IdClass
select t.levelStation from Time t
with EmbeddedId
select t.timePK.levelStation from Time t
References
JPA 1.0 specification
Section 2.1.4 "Primary Keys and Entity Identity"
Section 9.1.14 "EmbeddedId Annotation"
Sect...