I've seen many cases refer to CSS specificity when trying to override a particular CSS style.
What is CSS specificity really and what is it used for?
I've seen many cases refer to CSS specificity when trying to override a particular CSS style.
What is CSS specificity really and what is it used for?
There is a related question: What is SQL injection and how can I avoid it? which has excellent answers on the topic of SQL Injection.
I think many of us, when we see queries like this:
"SELECT * FROM tabla WHERE id=$valor";
O well:
"INSERT INTO tabla (columna) VALUES ($valor)";
O well:
"UPDATE tabla SET columna=$valor";
or something similar, we scream to heaven (and rightly so), warning the OP that his code is vulnerable .
Indeed, we understand that the variable $valor
is supplied by the user, through a form, a URL or any other external source .
If such a variable depends on the user and the programmer creates code so that the query is executed without any prevention , any malicious user can write malicious code where the external data is collected and said code will be executed.
In many cases, when vulnerable code is noticed, some argue that it is test data and that it is a test database. In other words, it doesn't matter if tables are deleted or if control of the database is taken, after all it is test data.
But... what if our system itself is at risk?
My question is if SQL Injection has an impact only at the database level or if any malicious user can also access our system (not only the database) and execute commands within it .
Or put another way: could SQL Injection go further than SQL? .
Seeing that in this code the use of attr
and prop
do the same thing, I would like to know what is the difference between the two? and in which scenarios it is recommended to use one or the other without falling into opinions, but based on recommendations made for demonstrable or documented reasons.
$(function()
{
$('#attrId').click(function(e)
{
console.log($(this).attr('id'));
});
$('#propId').click(function(e)
{
console.log($(this).prop('id'));
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a href="#" id="attrId">attr</a>
<hr />
<a href="#" id="propId">prop</a>
I need to check the content of a <input>
in which only integers greater than 0 (from 1 to X) can be entered. How can I indicate it in the attribute pattern
? Or should it be checked with a script?
From the original SO question Disable/enable an input with jQuery?
I want to enable and disable elements of an HTML page (be they inputs, divs, buttons, etc.).
How can I solve it using jQuery?