JavaScript - Need Help On How To Select A Dropdown Without Selecting One That Loads Before It.

I hope someone can help me. I am having a problem with a dropdown selection box. I think Javascript is the way to solve it, but I am unfamiliar with the language, any help would be much appreciated.

My drop down box selection box is created dynamically with data from a mysql database.

It is a list of artists/musicians. I have 1 column in the db table called artist_name and another called artist_id. The sql query selects both of these columns and displays artist names in the select box.

What I need is for the artist_id to be sent along with whichever artist is selected in the select box to the next page upon submitting the form.

I put in a input field, which I will make hidden eventually. But I want the input field to change to whatever the correct id is when the select box is changed.

I am thinking that the way to do this would be with a javascript onchange event. Will this work ?

If so I need help with the code. I have searched for examples online and while somewhat helpful, I am such a newbie with Javascript that I could not figure out how to modify the examples to what I need.

Here is the php/mysql code I have so far:

PHP Code:
$query4 = "SELECT artist_id,artist_name FROM artists ORDER BY artist_name";      
$result4 = mysql_query($query4) or die(mysql_error());

echo "<select name='artist'>
     <option value=''>Select Artist</option>";
     while($row=mysql_fetch_array($result4))
       {
        $artist_id=$row['artist_id'];
            echo "<option value='". $row['artist_name'] ."'>". $row['artist_name'] ."</option>";
        }
echo "</select>
     <input type='text' name='artist_id' id='artist_id' size='5' class='textfield' value='$artist_id'>"; 

I have a function that creates a Select dropdown on the fly:


function makeForm() {

mypara=document.getElementById("paraID");
myform=document.createElement("form");
myselect = document.createElement("select");

theOption=document.createElement("OPTION");
theText=document.createTextNode("Revenue");
theOption.appendChild(theText);
myselect.appendChild(theOption);

myform.appendChild(myselect);
mypara.appendChild(myform);
myselect.onchange=TitleOnChange;
mybreak=document.createElement("p");
myform.appendChild(mybreak);
}
function makeForm() {

mypara=document.getElementById("paraID");
myform=document.createElement("form");
myselect = document.createElement("select");

theOption=document.createElement("OPTION");
theText=document.createTextNode("Revenue");
theOption.appendChild(theText);
myselect.appendChild(theOption);

myform.appendChild(myselect);
mypara.appendChild(myform);
myselect.onchange=TitleOnChange;
mybreak=document.createElement("p");
myform.appendChild(mybreak);
}




I would guess that I have to add something like: theOption.setAttribute("value","1");


I want to be able to call the following function and execute a code base on the selection of the Select Dropdown:


<script type='text/javascript'>
function TitleOnChange()
{
if (document.form.select.value == "1")
{
alert("Value selected on the Select dropdonw is 1");
}

}

</script>
<script type='text/javascript'>
function TitleOnChange()
{
if (document.form.select.value == "1")
{
alert("Value selected on the Select dropdonw is 1");
}

}

</script>



I don't know why is not working. I assigned the value 1 to the select dropdown theOption.setAttribute("value","1");

I call the TitleOnChange function myselect.onchange=TitleOnChange;

And Finally I indicate that if the value is equal to 1 do...

view plaincopy to clipboardprint?
if (document.form.select.value == "1")
{
alert("Value selected on the Select dropdonw is 1");
}
if (document.form.select.value == "1")
{
alert("Value selected on the Select dropdonw is 1");
}



Does anyone knows why this doesn't work and how could I fix it?

Any helpt would be highly appreciate.

Thanks

Ok so let's say I have this dropdown with a list of these items:

PALCO
TRIBUNA
ORO

And in a button on the page I want to send it one of those names, let's say I send it ORO, and through Javascript select that in the dropdown list. How is this done? Do I have to iterate through everything, and how?

Thanks for any help in the subject.

Hello,

I have this reservation form found on the main page of: http://www.avis.com.lb/
As you can see the current month "August" is selected as the default month and so is the year and day (the day is programmed to jump 2 days ahead for the renting of the car...)

However if you look closely (check the screenshot attached) you'll see that the month "August" is repeated twice and so is the year "2009", the current month is repeated twice. What I wanna do is remove the duplication and just auto select the current month without duplicating it.

I found this code: http://www.experts-exchange.com/Prog..._24229186.html
But it doesn't seem to work with my form, I donno why.

Here is the code of the script both javascript and a little bit of php
PHP Code:
$date = strtotime("+2 day");
                $date2 = date('j',$date);
                 $date4 = strtotime("+5 day");
                $date3 = date('j',$date4);
                if($date3 == 1){
                $nextmonth = strtotime("+1 day");
                $monthid = date('m',$nextmonth);    
                }else{
                $nextmonth = strtotime("+0 day");
                $monthid = date('m',$nextmonth);    
                }
            if ($monthid==1){
                $year = date("Y") + 1;
            }else{
                $year = date("Y");
            }
              //$pupday = date("j") - 12;
              //$pupday = date("d") + 2;
              //echo $pupday;
              //$returnday = date("d") +5;
              $month = date("F"); 


Code:

var xMonths = new Array( '01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12' );

function getListValue( option_object  ){return option_object[ option_object.selectedIndex ].value;}
function setListValue( option_object, value  ){ option_object.selectedIndex = value;}
function addDays(myDate,days) {
    return new Date(myDate.getTime() + days*24*60*60*1000);
}
function init()
{
xToday = new Date();
yToday = addDays(new Date(),3);

xMonth = xToday.getMonth();
xDay = xToday.getDate()-1;
xYear = xToday.getYear()-2005; if (xYear < 2005) xYear=0;
yMonth = yToday.getMonth();
yDay = yToday.getDate()-1;
yYear = yToday.getYear()-2005; if (yYear < 2005) yYear=0;
  xF = document.forms['quickbooking'];
  setListValue( xF.ETAHour, 9 )
  setListValue( xF.ETAMonth, xMonth )
  setListValue( xF.ETADay, xDay )
  setListValue( xF.ETAYear, xYear )
  setListValue( xF.ETTHour, 9 )
  setListValue( xF.ETTMonth, yMonth )
  setListValue( xF.ETTDay, yDay )
  setListValue( xF.ETTYear, yYear )
}

Code:

<select class="formField" name="ETAMonth">
                <option value="<? echo $monthid; ?>"  selected="selected"><? echo $month; ?></option>
                <option 
                                value="01">January</option>
                <option 
                                value="02">February</option>
                <option value="03">March</option>
                <option 
                                value="04">April</option>
                <option value="05">May</option>
                <option 
                                value="06">June</option>
                <option value="07">July</option>
                <option 
                                value="08">August</option>
                <option value="09">September</option>
                <option 
                                value="10">October</option>
                <option value="11">November</option>
                <option 
                                value="12">December</option>
              </select>
              <select 
                                class="formField" name="ETAYear">
              <option value="<? echo $year; ?>" selected="selected"><? echo $year; ?></option>
              <option value="2008">2008</option>
              <option value="2009">2009</option>
              <option value="2010">2010</option>
            </select>

Help is very appreciated, thanks.

Hi,

I'm trying to integrate an address finder (http://www.craftyclicks.co.uk/) into my shopping cart (OsCommerce). I can get it to work but I need to add my own functionality. I'm not very experienced with JavaScript and my head has entered an infinite loop by now.

The problem is that the address finder script can change the selected country in a drop-down list depending on the postcode entered by the user (using the onblur event handler). What I need it to do is to remove all other countries depending on the postcode. I can get it to remove all other countries but how do i return to the original list of countries when the postcode is changed again? Once all other counties are removed, the drop-down list will obviously only have one option left... I guess the question is also how does a function remember what it has done before, when it is called again?

I have written this short test script as it is easier to work with than the craftyclicks oscommerce contribution:

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 
<head>

<title>HTML Template</title>
 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="description" content="" />
<meta name="keywords" content="" />

<script type="text/javascript">
//<![CDATA[

function store(element) {

// store values

	var cl = element;
	
	var text_list = new Array();
			
	var value_list = new Array();
	
	var length = cl.length;
	
	for (var foo=0; foo<length; foo++) {
	
		text_list[foo] = cl.options[foo].text;
		
		value_list[foo] = cl.options[foo].value;
		
		alert("text array " + foo + " " + text_list[foo]);
		
		alert("value array " + foo + " " + value_list[foo]);
		
	}
	
	populate(cl, text_list, value_list);

}

function populate(element, text, value) {

	// populate options with previously stored values
	
	var cl = element;
	
	var length = cl.length;

	cl.options.length=0;	
	
	for (var bar=0; bar<length; bar++) {
		
		cl.options[bar]= new Option(text[bar], value[bar], false, false);
		
	}
	
}

function crafty_set_country(code) {	

	var cl = document.getElementById('select');
	
	store(cl);
	
	for (var i=0; i<cl.length; i++) {

		if (cl.options[i].value == code) {

			alert(cl.options[i].value + " found");
			
			var value = cl.options[i].value;
			
			var text = cl.options[i].text;
			
			cl.options.length=0;
			
			cl.options[0]=new Option(text, value, true, true);
			
			/*
			for (var j=0; j<cl.length; j++) {
			
				alert("second loop " + cl.options[j].text);
				
				if (cl.options[i].value != code) {
				
					cl.options[j]
				
				}
			
			}
			*/
			
		} else {
		
		alert(cl.options[i].value);
		
		}
		
	}
	
}

//]]>
</script>

</head>
 
<body>

<form>

<select id="select">
  <option value="10">ten</option>
  <option value="20">twenty</option>
  <option value="30">thirty</option>
  <option value="40">fourty</option>
  <option value="50">fifty</option>
  <option value="60">sixty</option>
</select>

<input type="button" value="remove" name="button" onClick="crafty_set_country(50)">
<input type="button" value="repopulate" name="button" onClick="crafty_set_country(100)">

</form>

</body>
</html>

Many thanks!

Martin

Whenever I update my website, sometimes I notice my browser shows the old version or a modification in the browser after I upload to the ftp.

Whats the best way to prevent this from happening? Preferably without noticing it happening.

Thanks.

Resolved

I have an issue with my javascript files loading (i.e. checking the source code of the page after having loaded yields working links to my external files and the JQuery loading for sure after running some test), but calling a function from my javascript file works in no way shape or form. For example, one test I was running was:
From my .js file
Code:

$("p").click( function() { $(this).hide(); } )

This will work on a standalone page when I test it (not loading from external .js file), but not in the page I need to get my scripts running on.

Hey guys, hope this is in the right place...

Basically I was wondering if anyone could point me in the right direction or to an example of where a div slides onto the screen as soon as a page loads.

My client wants something like this: http://www.nytimes.com/packages/html...ion/index.html (without parallax or the fade-in) but I refuse to do it in Flash, obviously.

I have this gallery he http://juicenothing.com/freelance/gallery.php
The div id is wrap.

Is this possible? I can't find a good example anywhere!!

Thanks
(i'm a bit of a n00b, so pls go easy on me )

i have a javascript bookmark to log me onto my schools site
javascript: window.location.href="http://www.MySchool";login=document.getElementById('Login'); void(login.value='user'); pass=document.getElementById('pass');void(pass.value='pass'); LoginbuttonSubmit();

without window.location.href="http://www.MySchool" it works fine if the page is already open, but with using the link to open the page, it runs the remaning script before the page loads and it doesn't work. is there any way to fix this withou using setTimeout()

Hi Currently my website waits till all images are loaded up first:

Code:

$(document).ready(function(){

	* LOAD UP ALL THEM IMAGES FIRST... *

$(window).load(function() {
	letsLoad();
	fadingEffects();
});

However my website now has over 200 images on the website and now its taking way too long to load the images.

My question's a

1. Is it possible to either load the site when its around 20% or even 50% loaded?

OR

2. If its possible to give certain images a tag?? and when these images are loaded then the site loads?

Heres a link to the site - must warn you need broadband and a high speed connection takes way to long to load. Takes me around 1minute 30seconds

http://www.arcvizio.co.uk/ovoma/2/index.html


Thanks

I am working on a demo for a movie site, and 90% of everything seems cool.
Here

I am doing php.flushes, .htaccess caching and using PNGs to help with performance. I might start using another sub site to grab all the scripting from to increase performance, but it seems a tad bit slow at the moment.

- There are a few issues one being when you click on X-Men and look at the gallery the images seem to flicker sometimes going from image to image.

I am using a fade script I found and then using setTimeout() to give the fade script time to do its thing then call for a new image.
Code:

		FadeOpacity(main_img_id, 100, 0, 600, 12);
		setTimeout("updateGallery('"+target_arr+"','"+main_img_id+"')", 600);

- Also in the same area I am checking clientHeight after each image modifying the marginTop. The thing with that is the clientHeight only seems to update after the second function call. I tried using a setTimeout() but that didn't nothing.
Code:

		document.getElementById(main_img_id).src = "assets/movie_images/"+arr[i];
		img_height = document.getElementById(main_img_id).clientHeight;

Any suggestions with improving image load performance, the clientHeight issue or the image flickering issue would be appreciated.

So I am having a bit of a weird issue.

I am trying to make a webpage compatible with IE8 and it's quite painful. The page works great in firefox and chrome, but in IE8 it only loads some of the time. About 60% of the time the page loads and executes properly, but the other 40% of the time it looks like it hits an error somewhere and doesn't finish loading.

I have tried using the IE error console / debugger (by pressing F12), but I can't seem to find any information about why the page isn't loading properly.

The page that I am working on is located he http://tinyurl.com/89anxbd

The page uses an SVG based UI, and in order to make this compatible with <= IE8 I am using SVGWeb to render the SVG code as flash for IE8 users. For Firefox, and other browser-compliant users the SVG code is rendered natively in the browser.

Here is an image of what the page should look like (when it does load correctly in IE8):



Here is an image of what the page looks like when it fails to load:



It is like the page defines the circle elements for the various cities, but has not yet rendered the provinces (which are defined above the cities in the HTML body), but I'm not 100% sure on this.

Any help is much appreciated!

Does anyone know what's wrong with this code because when the page loads, the link is not being hidden

Code:

window.onload = setTarget;

function setTarget()
{
var theLinks = document.getElementsByTagName('a');
for(var i = 0; i < theLinks.length; i++)
{
if(theLinks[i].getAttribute('href') == '/subjects/new')
{
theLinks[i].style.display = "none";
}
}
}

I am working with using Javascript to create a page that scales and keeps its aspect ratio (much like a Flash page would). After a lot of trial and error, I have a prototype up with a couple of problems.

It loads correctly once in I.E. Reloading, or opening a new browser, will also load the page correctly. But visiting a different page and coming back causes the width attributes to break. This happens with the non-aspect-ratio version in pure HTML also, but I was hoping that this problem would be solved by establishing values based on javascript variables.

As for Firefox, the problem is more or less exactly the opposite. The page loads up all wonky the first time, and a reload or resize will fix it for every time afterward.

To see what I'm talking about, you can take a look at
http://www.jonesmfgmusic.com/testpag...lem_width.html

For the HTML only version, see
http://www.jonesmfgmusic.com/testpag...blem_html.html

I'm guessing this is something to do with the order in which the data is loaded, so that once the information is all cached, it stops functioning in IE, and starts functioning in FF... can anyone confirm whether I'm on the right track with that, or how to fix it if I am?

I'm most concerned by the fact that the width attribute is behaving as it does in IE. That looks like some kind of Microsoft bug to me, and I need a way around it. As for Firefox, I am guessing if I can just get it to load all of the correct information ahead of time, the page should come up correctly, but I just can't think how to do that.