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Dynamically adding a form to a Django formset with Ajax
...gt;
</div>
{% endfor %}
<input type="button" value="Add More" id="add_more">
<script>
$('#add_more').click(function() {
cloneMore('div.table:last', 'service');
});
</script>
In a javascript file:
function cloneMore(selector, type) {
var newElement =...
mongodb count num of distinct values per field/key
...
},
{ $unwind: "$keywords" },
{
$group: {
_id: {$toLower: '$keywords'},
count: { $sum: 1 }
}
},
{
$match: {
count: { $gte: 2 }
}
},
{ $sort : { count : -1} },
{ $limit : 100 }
]);
that give result s...
MySQL INNER JOIN select only one row from second table
...
You need to have a subquery to get their latest date per user ID.
SELECT a.*, c.*
FROM users a
INNER JOIN payments c
ON a.id = c.user_ID
INNER JOIN
(
SELECT user_ID, MAX(date) maxDate
FROM payments
GROUP BY user_ID
) b ON c.user_ID = b....
How do I list all files of a directory?
... = walk(mypath).next() (if you are confident that the walk will return at least one value, which it should.)
– misterbee
Jul 14 '13 at 20:56
...
Calling a Fragment method from a parent Activity
I see in the Android Fragments Dev Guide that an "activity can call methods in a fragment by acquiring a reference to the Fragment from FragmentManager, using findFragmentById() or findFragmentByTag() ."
...
How do I get the last inserted ID of a MySQL table in PHP?
...le into which new data is frequently inserted. I need to get the very last ID of the table. How can I do this?
21 Answers
...
Check if object value exists within a Javascript array of objects and if not add a new object to arr
...
I've assumed that ids are meant to be unique here. some is a great function for checking the existence of things in arrays:
const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function ad...
Reference: What is variable scope, which variables are accessible from where and what are “undefined
...P 5.6). Assigning other values to it inevitably
leads to a failure at least at the moment this article was written.
Nevertheless you are able to do so just on the next line of your code:
function countSheep($num) {
static $counter = 0;
$counter += sqrt($num);//imagine we need to take root ...
Check Whether a User Exists
...
You can also check user by id command.
id -u name gives you the id of that user.
if the user doesn't exist, you got command return value ($?)1
And as other answers pointed out: if all you want is just to check if the user exists, use if with id directl...
What characters are allowed in DOM IDs? [duplicate]
... is a difference between HTML and XHTML.
As XHTML is XML the rules for XML IDs apply:
Values of type ID MUST match the Name production.
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] |
[#xD8-#xF6] | [#xF8-#x2FF] |
[#x370-#x37D] | [#x...