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The JavaScript table sort algorithm on the page "How TO - Sort a Table" is quite inefficient. Not only does it use the infamous quadratic "bubble sort", but is also updates the table unnecessarily often. I was just learning JavaScript and HTML and was frustrated to find no reasonable example anywhere on the internet; so I made one myself 😁. Please use the attached algorithm, which is basically the same, but with three improvements: - Faster sorting by using binary insertion; - updates the table only when needed; - uses textContent instead of innerHTML so it is not distracted by invisible data. Feel free to adjust the program to your style. If you are interested, I am happy to spice it up with some comments for legibility, but it is quite trivial anyway. Jurjen tablesort.js
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Hi everybody http://www.w3schools.com/js/js_array_sort.asp If I'm right, the JS-Tutorial about sorting arrays randomly has a lack. The order of the array is kind of in a random order at the first glance, but the elements often stay at the same place as they were. This is true in the most for the element at the end of the array and the effect happens in most browsers, but not in all of them. I've written a script to test this. In these browsers the elements are not evenly distributed as they should: Chrome, IE, Edge, Opera. In Safari they were evenly distributed when I tried it. Try it yourself. <!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var sum; var points; var i, j; sum = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]; for (i=0;i<1000;i++){ points = [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1]; points.sort(function(a, {return 0.5 - Math.random()}); for (j=0;j<points.length;j++){ sum[j]+=points[j]; } } document.getElementById("demo").innerHTML = sum; </script> </body> </html> What the code does: It creates an array with a leading 1 and a 1 at the last place and zeroes between (points). Then it sorts this array randomly and adds the resulting array to a sum array. Then it starts again with the specific array. The generating, sorting and adding is done a 1000 times. When you reload the page the summed up numbers are displayed. Result: In many browsers the last number is higher than the others, which shouldn't happen with correct random sorting. Cheers, celus
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an someone tell me why this code isNOT sorting the lname output listing ? <?php include("/home/mdwvo/public_html/aabees.org/password_protect.php"); ?> <?php $con = mysql_connect("localhost","mdwvo_aaba","pwpwpwpwpw");if (!$con) { die('Could not connect: ' . mysql_error()); } mysql_select_db("mdwvo_aaba", $con); $result = mysql_query("SELECT * FROM members WHERE deleted = 'Yes' ORDER BY 'lname' "); Echo "<table size=50%>"; while($row = mysql_fetch_array($result)) { Echo "<tr><td>".$row['id'] . "</td></tr> <tr><td>".$row['fname']." ".$row['lname']."</td><td align=left> Date Joined - ".$row['joined'] . "</td></tr> <tr><td>".$row['street'] . "</td><td align=left> Dues Paid Through - ".$row['paid'] . "</td></tr> <tr><td align=left>".$row['city'] . ", ".$row['state'] . " ".$row['zip'] . "</td><td align=left> Phone - ".$row['phone'] . "</td></tr> <tr><td> </td><td align=left> Email - ".$row['email'] . "</td></tr>"; } Echo "</table>"; mysql_close($con);?>
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Hi, I am generating a bunch of arrays but I would like to change the order of these. This is my code now: $players_killed['time'] = strtotime($time);$players_killed['name'] = ': '.$player;arsort($players_killed, SORT_NUMERIC);echo var_dump($players_killed) .'<br>'; And this is the output: array(2) { ["time"]=> int(1334027580) ["name"]=> string(106) ": Brbasher" }array(2) { ["time"]=> int(1334029860) ["name"]=> string(102) ": Dynext" }array(2) { ["time"]=> int(1334029260) ["name"]=> string(110) ": Kronigrass" }array(2) { ["time"]=> int(1334036580) ["name"]=> string(108) ": Poliminia" } How can I make them order by the time value? My attempt with arsort($players_killed, SORT_NUMERIC); sure failed.
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I'm trying to write an algorithm return an array sorted by a given property in a JSON object. Here's an example of what I want to sort: obj_to_be_sorted = {'four' : {'num' : 4},'one' : {'num' : 1},'three' : {'num' : 3},'two' : {'num' : 2}} sort = function(obj, property, reverse_order) { a = [] for (key in obj) { a.push(key) } return a.sort(a, { /* I think it would involve the sort function... */ }} sorted_array = sort(obj_to_be_sorted, 'num', false); // should return the JSON keys sorted by the 'num' property, i.e. ['one', 'two', 'three', 'four'] I just don't know I would go about doing this. I'm thinking it would be only a few lines of code - very simple - but I'm just not good at writing algorithms yet. I would greatly appreciate any assistance you could give me.
