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dynamic enabling/disabling of checkboxes based on value of select box

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  #1  
Old January 25th, 2006, 10:12 AM
mjmanuel mjmanuel is offline
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dynamic enabling/disabling of checkboxes based on value of select box
Hi! I'm trying to make a page that automatically enables/ disables checkboxes named Bold and Italic based on the value of font in the drop down box.
For example, if the user selects 'Courier New' from the drop down box and it so happens there is no italic font style for this selection, it simply disables the checkbox italic. And if there is both bold and italic fonts styles but no bold italic style, a pop-up message should say 'No bold italic style available' upon submission. The checkboxes should also be reseted (unchecked) every time a selection is made. Ive started a bit of code. Thanks. Your suggestions especially regading syntax woud be very much appreciated.

// Another question: Is it valid to mix up php and js scripts like my function below?
<SCRIPT language="JavaScript">
<!--
function verifyCheckboxes() {
font_selected = document.Form1.textfont[$i].value;
php Code:
Original - php Code 
  1.  
  2.      if( font_selected != "" ) {
  3.     $fontstyle_result = mysql_query("select * from fonts where font = 'font_selected'");
  4.     $style_row = mysql_fetch_array($fontstyle_result);  
  5.     if ( $style_row['Bold'.$i] == NULL ) disableCheckBox(textbold[$i]); //trying to pass this off as a variable, is this possible?
  6.       else  enableCheckBox(textbold); //trying to pass this off as a variable, is this possible?
  7.     if ( $style_row['Italic'.$i] == NULL )  disableCheckBox(textitalic[$i]); //trying to pass this off as a variable, is this possible?
  8.       else enableCheckBox(textitalic[$i]); //trying to pass this off as a variable, is this possible?
  9.      }
  10.      echo "n";
  11.      

}


//is it possible to pass the values from the functions called earlier???
function disableCheckBox (checkBox) { if (!checkBox.disabled) checkBox.disabled = true; }

function enableCheckBox (checkBox) { if (checkBox.disabled) checkBox.disabled = false; }

function fontNotAvailable () {
// if bold and italic boxes are checked but there is no bold italic font in the database
if ( ( document.form1.textbold[$i].checked && document.form1.textitalic[$i].checked ) &&
php Code:
Original - php Code 
  1.  ( $style_row['Bold_Italic'.$i] == NULL) 
)
box = alert("Bold Italic style not available.");
return;
}

--></script>
...
<form method="post" name="form1" action="prev_update.php" enctype="multipart/form-data" onclick="fontNotAvailable()">
php Code:
Original - php Code 
  1. $result = mysql_query("select field_name, field_value, width, height, font, bold, italic, x, y, size, angle, r, g, b "
  2.             . "from template_details "
  3.             . "where del = 0 AND template_id=" . $_SESSION['template']);
  4. $rowCheck = mysql_num_rows($result);
  5.  
  6. if ($rowCheck > 0) {
  7.  $i = 1;
  8.  while($row = mysql_fetch_array($result, MYSQL_ASSOC)){
  9.   echo "Font: <select name="textfont" . $i ."" onChange="verifyCheckboxes();" >";
  10.  while ($row1 = mysql_fetch_array($font_result)){
  11.   if (!empty($rowCheck)) { 

<option value="
php Code:
Original - php Code 
  1.  echo $row1['font'];
"
php Code:
Original - php Code 
  1.  if ($font == $row1['font'])  echo "selected"; 
>
php Code:
Original - php Code 
  1.  echo $row1['font'];
</option>
php Code:
Original - php Code 
  1.  } else { 

<option value="
php Code:
Original - php Code 
  1.  echo $row1['font'];
">
php Code:
Original - php Code 
  1.  echo $row1['font']; 
</option>
php Code:
Original - php Code 
  1.  }  
  2.    }
  3.    echo "</select><br />"; 
  4.                     
  5.    echo "Style:<input type="checkbox" sty name="textbold". $i ."" value="" . $row['bold'] . "" "; if ($row['bold'] == 1){ echo "checked";}"><b>Bold</b>&nbsp;&nbsp;
  6.    <input type="checkbox" name="textitalic". $i ."" value="" . $row['italic'] . "" "; if ($row['italic'] == 1){ echo "checked";}"> <i>Italic</i><br />";

</form>
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  #2  
Old January 25th, 2006, 10:58 AM
Anonymous Anonymous is offline
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RE: dynamic enabling/disabling of checkboxes based on value of select box
Correction on the font select part:

$font_result = mysql_query("select font from fonts order by font");
echo "Font: <select name="textfont" . $i ."" onChange="verifyCheckboxes();" >";
while ($row1 = mysql_fetch_array($font_result)) {
if (!empty($rowCheck)) { ?>
<option value="<? echo $row1['font'];?>"<? if ($font == $row1['font']) echo "selected"; ?>><? echo $row1['font'];?></option>
<? } else { ?>
<option value="<? echo $row1['font'];?>"><? echo $row1['font'];?></option>
<? }
}
echo "</select><br />";
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