How to prevent auto redirect of drop down menu?

[vinceboy]

Hi..guys!I have a drop down menu with javascript null validation.However,instead of clicking submit button,it will immediately auto redirect after option was selected.Is it possible to prevent this kind of fast respond?

<select name="rNumber" title="number of ticket"
                     onChange="GoToNextPage(this.value)">
                      <option selected>Select</option>
                      <option>01</option>
                      <option>02</option>
                      <option>03</option>
                      <option>04</option>
                      <option>05</option>
                      <option>06</option>
 </select>
 

<script language="JavaScript" type="text/JavaScript">
    function validate(which) {
        var selects = which.getElementsByTagName('select');
        var radios = which.getElementsByTagName('input');
        for(sel = 0; sel < selects.length; sel++) {
            if(selects[sel].options[selects[sel].selectedIndex].text == 'Select') {
                alert('Please select number of ticket!');
                return false;
            }
        }
 
        var rselCount = 0;
        for(radio = 0; radio < radios.length; radio++) {
            if(radios[radio].checked) {
              rselCount++;
            }
        }
 
        if(rselCount == 0) {
           alert('Please select screening time!');
           return false;
        }
        return true;
    }
 
   function GoToNextPage(value){
        if(value != ""){
       document.location = 'reservation3.php?selected_no_ticket=' + value;
  }
}
 

<form action="reservation3.php" method="post" name="movieList" 
onSubmit="return validate(this);">
 

And also when onchange mixed with onsubmit,the validation can't execute
alert('Please select screening time!'); when radio button was not selected.What went wrong in the script?Thanks...

[acoder]

GoToNextPage() is sending it to the next page, so just get rid of the onchange.

[vinceboy]

I can't remove it because need to display the number of ticket in next page.
[PHP]<?= $_GET['selected_no_ticket']; ?>[/PHP]

What I intend to do is capturing the selected value and display it in next page.In the form I have radio button and drop down menu which apply onclick and onchange attribute respectively in a single function.

 function GoToNextPage(value){
        if(value != ""){
       document.location = 'reservation3.php?selected_no_ticket=' 
       +value+'selected_time=' + value;
  }
}
 

<form action="reservation3.php" method="post" name="movieList" 
          onSubmit="return validate(this);">
 
<select name="rNumber" title="number of ticket"onChange="GoToNextPage_ticket(this.value)">
 
<input type="radio"  name="time[<?php echo $rows['name']; ?>]"
 title ="screening time" value="<?php echo $time; ?>"
onClick ="GoToNextPage(this.value)">
 

However,by combining them into one GoToNextPage function,validate function can't work at all and the selected value are not displayed in next page.

[acoder]

Don't use onclick and onchange to pass form values. Let the submit take care of that.

When the form is submitted, the validation function is run. If it validates, return true so the form submits and the values are passed to the next page. If it doesn't validate, return false so the form submission is stopped.

[vinceboy]

You meant that changed onchange and onclick to onsubmit?

[acoder]

You meant that changed onchange and onclick to onsubmit?

No, when onsubmit returns true, the values will automatically be passed to the action page. Perhaps, you're accessing the values in the wrong way. You're using POST and in your PHP, you're trying to access with $_GET.

[vinceboy]

I have changed accessing method to POST,however how can I display both selected value in next page without using GoToNextPage function,onchange and onclick?
$_POST[' ?']

[acoder]

I have changed accessing method to POST,however how can I display both selected value in next page without using GoToNextPage function,onchange and onclick?
$_POST[' ?']

Yes, you would use $_POST for post-ed form values, but now we're moving into PHP territory.

[vinceboy]

Can you help me to work out?Thanks for generious help....

[acoder]

Can you help me to work out?Thanks for generious help....

With the PHP? I direct you to the capable hands of the experts in the PHP forum.Have you solved your original problem?

[vinceboy]

Solved already,Thanks a lot.Now validation control well but only thing can't display value in next page.

[acoder]

Solved already,Thanks a lot.Now validation control well but only thing can't display value in next page.

Since it's not Javascript-related, just start a new thread in the PHP forum (if you haven't already done so).

Edit: I see that you have. Well, good luck with the rest of your project.