Scratch

@windowsexplorer, is this the script you used on your website? not workng on FF7 :S

@WindowsExplorer Actually, it can be the registration script as well. Make sure your passwords are being hashed ( so check the database ) then check if they are being checked properly. You will also want to make sure there is enough space in the database ( the limit to the size of data in a column ) is large enough to hold the hashed password. You need to make sure all the input you are giving is correct and then you check the code and make sure all the commands are in the correct order and it's written properly.

So do that then, if you can't fix it, come tell me or someone else and tell us all the info you have found, ( Like the echo'd username and password and hashed password, make sure the account is a test one. ) and give us the code for the registration and login code.

Thanks Hardmath    That's a good tutorial! I learnt something new about Javascript myself!

^ Home
JavaScript Objects Part II: Methods
Difficulty: Moderate
[Part I] [Part II] [Part III]
Methods are like verbs: they dictate actions. So, a balloon can have the pop method. Methods take arguments, which are inputs (how loud should it pop?). They also sometimes return outputs (how many people got scared?).
Here is the general format:

OBJECT.method(argument1, argument2, ...)

For ones that return values, it's not much different:

alert(OBJECT.method(argument1, argument2, ...));

Here's the balloon example:

alert(balloon.pop(100)+" people got scared by a level 100 pop!");

Did you know alert() is a method of the window object? It's true! The correct syntax is window.alert(), alert() is a shorthand.
Now for the last, "real-world" example: the charAt() method of the string object:

alert("Hi!".charAt(1));//Note that charAt(0)=1st character...

^ Home

Last edited by Hardmath123 (2011-11-11 10:47:54)

^ Home
JavaScript Objects Part III: Custom Objects
Difficulty: Moderate
[Part I] [Part II] [Part III]
There are, in the end, a limited number of JavaScript objects out-of-the-box. But you can make your own. In this example, we will make a sprite object, with properties and methods.
An object is declared like a function:

function sprite()
{
}

An instance is created with the code:

var sprite1 = new sprite();

Properties are added by using the this object. this is the instance of the object.

function sprite()
{
 this.xposition = 0;
}

Now, you can access this property:

var sprite1=new sprite();
alert(sprite1.xposition);
// Or change it:
var sprite1=new sprite();
sprite1.xposition = 5;

But what if you want a customized sprite directly, without changing them individually? You use startup parameters.

function sprite(xpos)
{
 this.xposition=xpos;
}
// And the instance:
var sprite1=new sprite(5);

Finally, methods are added as properties, but the value is a function rather than a number or string:

function sprite(xpos)
{
 this.xposition=xpos;
 this.move=function()
 {
  this.xposition=this.xposition+5;
 }
}
//And the instance:
sprite1.move()

Note that sprite1.move [no brackets] will report the function, unevaluated.
^ Home

Last edited by Hardmath123 (2011-11-11 10:55:15)

Format: (You may want to add this to the above post)

[url=http://scratch.mit.edu/forums/viewtopic.php?pid=991961#p991961]^ Home[/url]
[b]Title[/b]
Difficulty: [color=green/orange/red][b]Easy/Moderate/Hard[/b][/color]
TEXT...
[url=http://scratch.mit.edu/forums/viewtopic.php?pid=991961#p991961]^ Home[/url]

Last edited by Hardmath123 (2011-11-11 10:45:43)

^ Home
PHP variables
Difficulty: Easy

Variables are what PHP is all about. They allow you to count, store and display information and generally they are the very underpinning of the language so learning to use them is a good idea.

Things you should know
     - PHP can only be used in a .php file.
     - Within that file, all PHP mich be written within <?php and ?> tags or they won't
       work.
     - A variable is a "space" that can hold a changeable value. Like a little box for
       words, lists and numbers.

Syntax
PHP variables don't have many rules to work. Variables have to be created and set to something before they can be used, and they always start with a $ symbol.

<?php
$treeCounter = 0;
?>

In this example there are three things to note. Firstly, the variable has a descriptive name which indicates what it is doing. It's very good practice to do this or you'll forget what your code is doing and other people will struggle to help you if you get stuck. Secondly, notice that the variable starts with a lowercase and the second word is started with a capital rather than a space. This is called camel case. Spaces can not be used in a variable name so eitherCamelCase or_underscores are used though camelCase is considered standard practice.

Thirdly, notice that the variable is instantly set to something. In this case 0. 0 is a number and can just be typed but if you wanted a word you would enclose it in speech marks to create a string. The "=" symbol sets the variable and a semi-colon (   ends the line. These are both necessary.

<?php
$treeCounter = 0;
$treeCounter ++;
?>

In this second example, the variable treeCounter is once again created and set to 0. On the second line you can see a piece of code which increments (increases the value by 1) the variable. This would do the same thing as doing $treeCounter = $treeCounter + 1;. This will leave the value of treeCounter as 1 by the end of the script.

GET variables

Variables can actually be placed into the URL of a PHP page. This lets you send someone a link with information in it that the page can take. For example, your friend Josh wants to see the cool page you've been working on so you send him a link like this one:

http://www.mywebsite.com/greeting.php?name=josh&time=morning

The main part here to concentrate on is the "?name=josh&time=morning" part. the "?" after the normal page URL lets the page know that there are potentially variables in the URL name. "name" and "time" are variables as they are on the left hand side of the = symbol whilst "josh" and morning are on the right, making them values. The "&" symbol lets you seperate the variables in the URL, don't forget to add it between variables if you have more than one!

So you've sent Josh this link and when he follows it, he will be potentially amazed that, without entering anything on the page, the site nevertheless seems to know his name and the time because you've used a script like this one:

<?php
echo "<p>Hello, " . $_GET['name'] . "! Isn't it a lovely " . $_GET['time'] . "?</p>";
?>

This script pulls the name and time out of the URL and sends it back to him in a sentance. Josh would see the text "Hello, Josh! Isn't it a lovely morning?" on his screen.

A few things to explain there, firstly the echo command. Anything between an echo command and the next ; will be printed onto the page for people to see. Anything in speech marks will be sent as you see it, including HTML like the <p> tags. anything not in speech marks is treated as a variable, and the contents of the variable is sent instead.

Notice that several things are being sent - strings and variables and that they are seperated by periods (.). Periods allow you to join several things together to make one whole thing.

the $GET[] symbol tells the script that this variable is coming from the URL and to look for it there. The name of the variable goes in the square brackets in singe speech marks (such as 'name') and the value of the variable is read out by the script (such as 'Josh').

^ Home

Hey guys.

Ok, so I made a quick little thing for this, here: web.escratch.org.  This is a perfectly legal site, because you need a moderator to approve your comment before it is published, and only approved people can post blog posts.  I'll allow a few people to make blogposts (like hardmath, and sparks), but for everyone else, if they want to have their entry published, post it here, and we will add it for you!

Its not quite done yet, but it will be soon.

sparks wrote:

This seems really cool, gbear, I was excited when I first saw it, but then I thought: There are tons of web-language discussion sites, the aim of this thread is to give people in AT and easy-to-spot-easy-to-check place to post tutorials and such... I don't know what other people think - I'd like to hear them but it seems that putting it on another site won't be as accessible and then it may as well be any web-discussion site?

I'm sorry if that sounds harsh, if you disagree I'd be more than happy to hear why 

I do agree that is is sorta a web-discussion site, but, part of the reason is for the organization.  Part is because I think it would be a good way for people to look quickly at recent tutorials and see whats new.  And hey, I think it looks cooler 

sparks wrote:

Good point. What do other people think?

I think it is easier to ask questions here than to go to another website. I don't think it's necessary and I prefer the plainer layout here in the Scratch Forums rather than something that isn't freely available to ask questions on.

Though it may become useful in the future. 

Last edited by Magnie (2011-11-11 20:26:54)

gbear605 wrote:

Magnie wrote:

sparks wrote:

Good point. What do other people think?

I think it is easier to ask questions here than to go to another website. I don't think it's necessary and I prefer the plainer layout here in the Scratch Forums rather than something that isn't freely available to ask questions on.

Though it may become useful in the future. 

My thinking was that this thread would be useful for questions/help, and the website would have tutorials, and stuff like that.

That works. Would be especially helpful for those big tutorials.

I have a code:

<?php
include "demo.html";
include "connect.php";
session_start();
if (!($_GET['id'] == "")) {
$idr = $_GET['id'];
$result3 = mysql_query("SELECT * FROM games WHERE id = '$idr'", $link);
$mysql_nums = mysql_num_rows("SELECT * FROM games WHERE id = '$idr'", $link);
if ($mysql_nums < 1) {
echo "<p>Game doesn't exist.</p>";
} else {
while($rowr=mysql_fetch_array($result3)){
$url2 = $rowr['url'];
$name2 = $rowr['name'];
$by2 = $rowr['by'];
$id2 = $rowr['id'];
echo "<p><b><u>$name2</u>:</b><br /><applet id=\"ProjectApplet\" style=\"display:block\" code=\"ScratchApplet\" codebase=\"http://plaxon.comyr.com/games\" archive=\"ScratchApplet.jar\" height=\"387\" width=\"482\">
<param name=\"project\" value=\"$url2\"></applet><br />";
}
echo "</p>";
}
} else {
$num_result = mysql_num_rows("SELECT * FROM games", $link);
if ($num_result == "0") {
echo "<p>No games yet!</p>";
} else {
$result = mysql_query("SELECT * FROM games", $link);
$num_rows = mysql_num_rows($result);
echo "<p>";
while($row=mysql_fetch_array($result)){
$url = $row['url'];
$name = $row['name'];
$by = $row['by'];
$id = $row['id'];
echo "<p><a href=\"game.php?id=$id\">$name</a> by $by<br />";
}
echo "</p>";
}
}
?>

and I keep getting:
Warning: Wrong parameter count for mysql_num_rows() in /home/a5292800/public_html/game.php on line 23
and when i click the game link
Warning: Wrong parameter count for mysql_num_rows() in /home/a5292800/public_html/game.php on line 8

see it at http://www.plaxon.comyr.com/game.php

Magnie wrote:

Line 23: $num_result = mysql_num_rows("SELECT * FROM games", $link);

The SQL needs to be a query first:

$num_result = mysql_num_rows(mysql_query("SELECT * FROM games", $link));

That should work. The same goes for Line 8, you need to add the mysql_query.

Thanks    it works now! You do know a lot about php