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Programmatically trigger “select file” dialog box
I have a hidden file input element. Is it possible to trigger its select file dialog box from a button's click event?
13 ...
how to generate migration to make references polymorphic
...ic. Instead, you should see the actual fields that Rails uses (the Rails Guides have more info).
– Michelle Tilley
Apr 4 '11 at 15:44
2
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Why isn't there a Guid.IsNullOrEmpty() method
This keeps me wondering why Guid in .NET does not have IsNullOrEmpty() method (where empty means all zeros)
6 Answers
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How to select label for=“XYZ” in CSS?
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(I'm assuming that the template {t _your_email} will fill in a field with id="email". If not, use a class instead.)
Note that if the value of the attribute you're selecting doesn't fit the rules for a CSS identifier (for instance, if it has spaces or brackets in it, or starts with a digit, etc.), ...
MySql export schema without data
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Also consider using the --single-transaction option if you don't want or can't do table locks.
– Jim
Jan 22 '13 at 21:55
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Is there a way to rollback my last push to Git? [duplicate]
...te the last commit from master. Delete=remove from commit history. (not evident in your text that git revert will take off from history)
– Peter Krauss
Feb 16 '18 at 13:48
1
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Accessing JSON object keys having spaces [duplicate]
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The way to do this is via the bracket notation.
var test = {
"id": "109",
"No. of interfaces": "4"
}
alert(test["No. of interfaces"]);
For more info read out here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects
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python .replace() regex [duplicate]
...> re.sub(r'a', 'b', 'banana')
'bbnbnb'
>>> re.sub(r'/\d+', '/{id}', '/andre/23/abobora/43435')
'/andre/{id}/abobora/{id}'
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check / uncheck checkbox using jquery? [duplicate]
...ou know, in HTML, it would look something like:
<input type="checkbox" id="myCheckbox" checked="checked" /> <!-- Checked -->
<input type="checkbox" id="myCheckbox" /> <!-- Unchecked -->
However, you cannot trust the .attr() method to get the value of the checkbox (if you n...
plsql 存储过程 事务 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的数据量
例子：
create or replace procedure stu_proc
(
v_id in number,
v_name in varchar2,
v_age in number,
v_msg out varchar2
) as
begin
insert into student(id, sname, age) values (v_id, v_name, v_age);
commit;
v_msg:='添加成功';
exception
when others th...