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How can I check if an element exists in the visible DOM?
How do you test an element for existence without the use of the getElementById method?
25 Answers
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Using Node.JS, how do I read a JSON file into (server) memory?
...o your JSON file.
For example, suppose you have the following JSON file.
test.json
{
"firstName": "Joe",
"lastName": "Smith"
}
You can then easily load this in your node.js application using require
var config = require('./test.json');
console.log(config.firstName + ' ' + config.lastName);...
How serious is this new ASP.NET security vulnerability and how can I workaround it?
...the error I assume (and is almost certaint) it's an app error, but need to test this some myself. So having custom error pages would not show the padding error.
– Mikael Svenson
Sep 15 '10 at 19:55
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Make .git directory web inaccessible
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My regex works in my testing, and should work according to the RedirectMatch documentation since the regex only has to match part of the URL, not the full URL: see the "subtle difference" note in the linked AliasMatch documentation. Still, the do...
Get program execution time in the shell
...assful of students' programs:
fmt="run { date = '$(date)', user = '$who', test = '$test', host = '$(hostname)', times = { user = %U, system = %S, elapsed = %e } }"
/usr/bin/time -f "$fmt" -o $timefile command args...
I later concatenated all the $timefile files and pipe the output into a Lua inte...
Compare floats in php
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There are still some edge cases which this test fails. Such as a=b=0 and if a is the smallest possible none zero positive value and b is the smallest possible non zero negative value, the test will incorrectly fail. Some good information here: floating-point-gui.de/er...
Can I replace groups in Java regex?
...lt);
}
}
m.appendTail(sb);
return sb.toString();
}
@Test
public void test1() {
String input = "{\"_csrf\":[\"9d90c85f-ac73-4b15-ad08-ebaa3fa4a005\"],\"originPassword\":[\"123\"],\"newPassword\":[\"456\"],\"confirmPassword\":[\"456\"]}";
String expected = "{\"_csrf\":...
CSS How to set div height 100% minus nPx
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Here is a working css, tested under Firefox / IE7 / Safari / Chrome / Opera.
* {margin:0px;padding:0px;overflow:hidden}
div {position:absolute}
div#header {top:0px;left:0px;right:0px;height:60px}
div#wrapper {top:60px;left:0px;right:0px;bottom:0px...
Can I force a page break in HTML printing?
... things in CSS, this doesn't always work consistently across the board, so test the living daylights out of it, lest you have angry users wondering why your site prints piles of extra blank pages!
– Zoe
Nov 2 '09 at 22:17
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Not equal != operator on NULL
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The only test for NULL is IS NULL or IS NOT NULL. Testing for equality is nonsensical because by definition one doesn't know what the value is.
Here is a wikipedia article to read:
https://en.wikipedia.org/wiki/Null_(SQL)
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