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javascipt validation for multiple select box

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Jun 26.2009

[FONT=”Arial”]Hi i am a fresher in php.I want to know the how javascipt validation is working for multiple select box. I search the site but don’t get he validation that passes multiple value to the database.
This is my php code [/FONT][FONT=”Arial Black”]echo “<select class=’studententer’ name=’course[]’ multiple=’multiple’ >”;
echo “<option value=’select’ selected>———select———-</option>”;

while($row=mysql_fetch_array($result))
{
$courseid=$row[‘SUBJECT_ID’];
$coursename=$row[‘SUBJECT_NAME’];
echo “<option value=’$courseid’ >$coursename</option>”;
}
echo “</select>”;
$sub–;[/FONT]

Thank you

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JavaScript

2 Comments(s) ↴

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@bubakJun 26.2009 — To check to see if at least one element is selected in javascript you can do something like this:

[CODE]if (document.frm.elements[course[]'].selectedIndex == -1) {error += "Please select at least one course.n";}[/CODE]


If you would like to traverse a multiple element select, something like this would work:

[CODE]for (i=0; i<document.frm.elements[course[]'].length; i++) {
if (document.frm.elements[course[]'][i].selected) {do something....}
}[/CODE]

In both of these examples, it is assumed that the select box is inside of a form named frm.
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@anoop07011986authorJun 30.2009 — Thank you bubak, i change the code exactly you said in the reply now the code is working.

Actually there are one more problem in my prvious code. I write the javascript focus function in the previous field to focus to the course field. actually that was also wrong.

The code was document.testform.course[].focus();

This was also a wrong statement

Thank you very much bubak
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