Beginner in Javascript I need help!!

overdosed20 · June 13th, 2008, 11:55 AM

I have a class with a crap teacher I really need help with this as I cant get it to work. Here are the instructions.

The strings entered by the user are split at the space to give a two-element array, which is assigned to a new row in strs. Function check repeatedly prompts the user for a string and checks whether there is a pair in array strs that matches in the manner described above. It does this with a do/while loop. Index i starts at 0 and variable found is initialized to false. It goes through the rows in strs (indexed by i) until found becomes true or the rows are exhausted (i is equal to the length of strs).

Here is the code I have so far:
<html>
<head>
<script type=”text/javascript”>
var strs = new Array();
init( strs );
check( strs );
function init( strs )
{
while ( str = window.prompt(
"Enter a string with an initial and final segment"
+ " separated by a space",
"" ) )
strs=str.split(" ") ;
}

function check( strs )
{
while ( str = window.prompt( "Enter a string", "" ) )
{
var found = false,
i = 0;

do {
var loc1 = strs[i][0];
if ( loc1 != -1 ) {
var loc2 = strs[i][1]+ strs[i][0];
if ( loc2 != -1 )
found = true;
}
i++;
} while ( !found && strs.length>i );
if ( found )
alert("Found");
else
alert("Not found");
}
}
</script>
</head>
</html>

sr71000 · June 13th, 2008, 10:40 PM

you should always put your code inside of code tags

[ code ]
your code here
[ /code ]

if you take out the spaces around the words code and /code you get

Code:

your code here

This will make it much easier for us to troubleshoot and help

We don't like to give out answers with homework. If you want help, get started with the project and when you're stuck on something, as a more specific question.

I know that I and others are glad to help but I know that at least I personally don't like to just give out answers.

-Kevin

overdosed20 · June 20th, 2008, 11:39 AM

I just can't figure out why nothing is displaying when I launch this from notepad.

Code:

<html>
<head>
<title>Quiz2</title>
<script type=”text/javascript”>
var strs = new Array();
init( strs );
check( strs );
function init( strs )
{
   while(str = window.prompt( 
                  "Enter a string with an initial and final segment"
                  + " separated by a space",
                  "" )) 
    
 strs=str.split(" ");
}
function check( strs )
{
  while ( str = window.prompt( "Enter a string", "" )  )  {
    var found = false,
        i = 0;
  
    do  {
      var loc1 = strs[i][0];
      if ( loc1 != -1 )  {
        var loc2 = strs[i][1]+ strs[i][0];

        if ( loc2 != -1 )
          found = true;
      }
      i++;
    } while ( !found && strs.length>i );
    if ( found )
      alert("Found");
    else
      alert("Not found");
  }
}
</script>
</head>
</html>

amtrac24 · June 22nd, 2008, 10:01 PM

your quotes are funky...once i changed them with the line below it ran through fine.

Code:

<script type="text/javascript">

amtrac24 · June 22nd, 2008, 10:05 PM

you need to fix your loops though.

amtrac24 · June 22nd, 2008, 10:31 PM

Code:

<html>
<head>
<title>Quiz2</title>
<script type='text/javascript'>
var strs = new Array();
strs=init( strs );
check( strs );

function init( strs )
{
var str='';

while (str=='')
{
   str = window.prompt( 
                  "Enter a string with an initial and final segment"
                  + " separated by a space",
                  "" )
}
  

 strs=str.split(" ");
 
 return strs;

}
function check( strs )
{
var str='';
var found = false;

while (str=='')
{
 	str = window.prompt( "Enter a string", "" ) 
}

	for (var i=0;i<strs.length;i++)
	{
		if (strs[i]==str)
		{
		   found=true;
		}
	}
	
	if (found)
		alert('Found');
	else
		alert('Not Found');
}
</script>
</head>
</html>

overdosed20 · June 24th, 2008, 12:34 PM

Thanks Amtrack that worked great.