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Apr 18th, 2007

Populating a Drop-down List

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hi

i have the following issue. i'd much appreciate someone helping me out here.

i'm trying to let a drop-down list (which will be placed, and vary on many pages) with the contents of an array. how can i get that done?

plus, once a certain element has been selected, i'd like that a link appears that links to a specific (filename with certain naming, according to the selected element) file. how could that be implmented?

again, i'd much apprecite your help
pygmalion

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pygmalion

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Apr 18th, 2007

Re: Populating a Drop-down List

Below is a basic example of how I wrote an array drop down for a choice of messengers. $msgr is simply a post result for msgr, so it retains what you selected.

PHP Syntax (Toggle Plain Text)
<fieldset><label for="msgr">Primary Messenger:</label>
<?php
	echo "<select name=\"msgr\" id=\"msgr\">\n";
	$msgrArr = array();
	$msgrArr[] = "MSN";
	$msgrArr[] = "AIM";
	$msgrArr[] = "YIM";
	$msgrArr[] = "ICQ";
	$msgrArr[] = "Jabber/Gtalk";
	foreach($msgrArr as $v){
		if ($msgr == $v) {
			echo "<option value=\"$v\" selected=\"selected\">$v</option>\n";
		} else {
			echo "<option value=\"$v\">$v</option>\n";
		}
	}
	echo "</select>";
?>
</fieldset>
<fieldset><label for="msgr">Primary Messenger:</label>
<?php
	echo "<select name=\"msgr\" id=\"msgr\">\n";
	$msgrArr = array();
	$msgrArr[] = "MSN";
	$msgrArr[] = "AIM";
	$msgrArr[] = "YIM";
	$msgrArr[] = "ICQ";
	$msgrArr[] = "Jabber/Gtalk";
	foreach($msgrArr as $v){
		if ($msgr == $v) {
			echo "<option value=\"$v\" selected=\"selected\">$v</option>\n";
		} else {
			echo "<option value=\"$v\">$v</option>\n";
		}
	}
	echo "</select>";
?>
</fieldset>

As for the other thing your on about, perhaps you want to write some javascript thats populated then just shows the data. Alternatively you could use AJAX or simply reload the page based on the selection. Perhaps you can explain what your after more in depth.

landae

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Apr 20th, 2007

Re: Populating a Drop-down List

Another solution would be, instead of using a foreach() you could use a for() loop.

php Syntax (Toggle Plain Text)
$arr = array("cat", "dog", "horse", "frog");
 
echo "<select name=dropdown_list><option value="bleh">Choose Me</option>";
 
// loop while $i is less than count(the amout of elements) of $arr
for($i=0; $i < count($arr); $i++)
   echo <option value=". $arr[$i] .">" . $arr[$i] . "</option>";
 
echo "</select>";
 
$arr = array("cat", "dog", "horse", "frog");
 
echo "<select name=dropdown_list><option value="bleh">Choose Me</option>";
 
// loop while $i is less than count(the amout of elements) of $arr
for($i=0; $i < count($arr); $i++)
   echo <option value=". $arr[$i] .">" . $arr[$i] . "</option>";
 
echo "</select>";

Enjoy.

dr4g

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May 1st, 2007

Re: Populating a Drop-down List

thanks a lot for your elaborate replies.
the populating of the drop-down list now works fine.

the case is as follows, i'm trying to populate the dropdown-list via a multidimensional array (because they will be audio recordings of parts of each chapter of a book).
now, first i'd like to declare the multi-dimensional array, which i have done as follows.

PHP Syntax (Toggle Plain Text)
$book1 = array("chapter1"    =>    array(),
                     "chapter2"    =>    array(),
                     "chapter3"    =>    array());
$book1 = array("chapter1"    =>    array(),
                     "chapter2"    =>    array(),
                     "chapter3"    =>    array());

now, i'd like to populate the second dimension of this array by using for-loops, as follows:

PHP Syntax (Toggle Plain Text)
    $chapter1_amount = 4;
    $chapter2_amount = 6;
    $chapter3_amount = 8;
 
    for($i=1; $i <= $chapter1_amount; $i++)
    {
        $book1["chapter1"][] =  $i;
    }
 
    for($i=1; $i <= $chapter2_amount; $i++)
    {
        $book1["chapter2"][] =  $i;
    }
 
    for($i=1; $i <= $chapter3_amount; $i++)
    {
        $book1["chapter3"][] =  $i;
    }
    $chapter1_amount = 4;
    $chapter2_amount = 6;
    $chapter3_amount = 8;

    for($i=1; $i <= $chapter1_amount; $i++)
    {
        $book1["chapter1"][] =  $i;
    }
    
    for($i=1; $i <= $chapter2_amount; $i++)
    {
        $book1["chapter2"][] =  $i;
    }

    for($i=1; $i <= $chapter3_amount; $i++)
    {
        $book1["chapter3"][] =  $i;
    }

i think herein lies the mistake, at declaring the variables at the 2nd dimension. am i doing this correctly?

afterwards, i show the drop-down list as you guys have suggested:

PHP Syntax (Toggle Plain Text)
echo "<select name=\"book1\"><option value=\"bleh\">Choose Part</option>";
 
    foreach($book1 as $itemindex[] => $item[])
    {
        echo "<option value=\"$item\">$item</option>\n";
    }
 
    echo "</select>";
echo "<select name=\"book1\"><option value=\"bleh\">Choose Part</option>";
 
    foreach($book1 as $itemindex[] => $item[])
    {
        echo "<option value=\"$item\">$item</option>\n";
    }
 
    echo "</select>";

when doing it this way, i get a drop-down list which just has three identical elements, all entitled 'Array'.

once this is done, i was just wondering how i could for example manipulate a link next to it to link to a file according to the chosen element in the list.

i'd very much appreciate your help, really
pygmalion

pygmalion

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May 2nd, 2007

Re: Populating a Drop-down List

hi again.

i'd much appreciate anyone's help. this is quite of an importance to me.

thanks in advance
pygmalion

pygmalion

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May 2nd, 2007

Re: Populating a Drop-down List

PHP Syntax (Toggle Plain Text)
     /* init */
     $arr = array(
                       "chapter1" => array(),
                       "chapter2" =>  array(),
                       "chapter3" => array()
      );
 
    $chapter1_amount = 4;
    $chapter2_amount = 6;
    $chapter3_amount = 8;
 
      for($i = 1; $i <= $chapter1_amount; $i++)
         array_push($arr['chapter1'], $i);
 
      for($i = 1; $i <= $chapter2_amount; $i++)
         array_push($arr['chapter2'], $i);  
 
      for($i = 1; $i <= $chapter3_amount; $i++)
         array_push($arr['chapter3'], $i);
     /* init */
     $arr = array(
                       "chapter1" => array(),
                       "chapter2" =>  array(),
                       "chapter3" => array()
      );

    $chapter1_amount = 4;
    $chapter2_amount = 6;
    $chapter3_amount = 8;

      for($i = 1; $i <= $chapter1_amount; $i++)
         array_push($arr['chapter1'], $i);

      for($i = 1; $i <= $chapter2_amount; $i++)
         array_push($arr['chapter2'], $i);  

      for($i = 1; $i <= $chapter3_amount; $i++)
         array_push($arr['chapter3'], $i);

This theoretically works. It's 3am and i didnt compile it, but looks fine to me.

For manipulating the link acording to the dropdown list.
You'd need to call a javascript function to generate the link.
When you choose an option in the list, you'd call the javascript function to update the link.

PHP Syntax (Toggle Plain Text)
      /* HTML */
      <select onChange="updateLink(this)">....</select>
 
      /* JavaScript */
     function updateLink(list) {
        if(list.value='bleh')
            link = "bleh";
 
       ......
 
       return link;
 
     }
      /* HTML */
      <select onChange="updateLink(this)">....</select>

      /* JavaScript */
     function updateLink(list) {
        if(list.value='bleh')
            link = "bleh";

       ......
  
       return link;

     }

Last edited by dr4g; May 2nd, 2007 at 11:22 pm.

dr4g

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May 4th, 2007

Re: Populating a Drop-down List

i did everything as you said, and it worked neatly.

thanks so much, really
pygmalion

pygmalion

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May 4th, 2007

Re: Populating a Drop-down List

Not a problem.

dr4g

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Jul 16th, 2010

How would I stop selectedindex vlaue in php

Hello guyz,

I am trying to slect value from dropdown as well as page contents wanted to change on that selected value.

I have a problem in a control where I don't want to selectedindex change..i.e I want to stop this property .How will it be possible in PHP

Kishan_23

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Oct 4th, 2011

Re: Populating a Drop-down List

hello! I have a problem creating a dropdown list from my database.. my code is as follows:

PHP Syntax (Toggle Plain Text)
$sql = "select * from subjectarea";
		 $result = mysql_query($sql);
		 $num = mysql_num_rows($result);
	     $j=0;
 
		while ($row = mysql_fetch_array($result)) 
			{
				$result_array[$j]=$row["expertise"];
				$j++;
			}
			 $i =0;
 
		while($i<$num)
			{
			$tpl -> assign( array( "{KEYWORD}" => htmlspecialchars(stripslashes($result_array[$i])) ));
			$i++;                       
      } //end while
$sql = "select * from subjectarea";
		 $result = mysql_query($sql);
		 $num = mysql_num_rows($result);
	     $j=0;
		
		while ($row = mysql_fetch_array($result)) 
			{
				$result_array[$j]=$row["expertise"];
				$j++;
			}
			 $i =0;

		while($i<$num)
			{
			$tpl -> assign( array( "{KEYWORD}" => htmlspecialchars(stripslashes($result_array[$i])) ));
			$i++;                       
      } //end while

when I do echo in the second while, I can see all my values correctly.. but I can't see them in my form. I have the .tpl file as follows..

PHP Syntax (Toggle Plain Text)
		<tr>
			<td align="right">
				<strong>1st Keyword *:</strong>
			</td>
			<td>
				<select name="KEYWORD1" style="margin-left: 10pt;">
					<option value="{KEYWORD}">{KEYWORD}</option>										
				</select>
			</td>
		</tr>
		<tr>
			<td align="right">
				<strong>1st Keyword *:</strong>
			</td>
			<td>
				<select name="KEYWORD1" style="margin-left: 10pt;">
					<option value="{KEYWORD}">{KEYWORD}</option>										
				</select>
			</td>
		</tr>

where am I wrong? I cannot avoid using tpl. Thank you in advance...

ilonael

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