Web Development

Re: Catch values from listbox filled with jscript

21-Mar-06 0:45

Hello!

I have a listbox I fill with data using a javascript (thanks to this board). When the user clicks a WebControls.Button I want to get hold of these values. I had something like this in mind:

ArrayList alValues = new ArrayList();<br />
<br />
foreach(ListItem li in lbListBox.Items)<br />
{<br />
    alValues.Add(li.Value.ToString());<br />
}

But when postback occurs the listbox is emptied again and ListBox.Items.Count is 0.

How do I achieve this?

RichardGrimmer22-Mar-06 5:24

RichardGrimmer

22-Mar-06 5:24

You could try hooking the Button's event handler to a javascript function, instead of a codebehind (server) function. This would mean that the page wouldn't post back at all......

"Now I guess I'll sit back and watch people misinterpret what I just said......"
Christian Graus At The Soapbox

Can javascript detect mouse positions on the listbox?

KaKa'20-Mar-06 21:54

KaKa'

20-Mar-06 21:54

Hello,

Can javascript detect where the mouse pointer is within an asp.net listbox?

For example, can it detect if the mouse is pointing at a listitem and not at the empty space within the listbox?

Calling C# component from ASP

umeshkannan20-Mar-06 19:22

umeshkannan

20-Mar-06 19:22

Hi how I can call a C# component from ASP?
I have created the C# component and use Rregasm to devolop .tlb.I put both in wwwroot and try to acces from an ASP page using server.createobject,but getting an error server.creatobject failed.why?
-Umeshkannan

browser within a browser in ajax?

_kane_20-Mar-06 9:27

_kane_

20-Mar-06 9:27

hello,

is it possible in ajax to create a browser within a browser with a proper address bar? I am looking for something like gollum but somthing that will show the address of the current page on top like our address bar

"Some guys hack just to get themselves a girlfriend.What a pathetic reason huh ?"

Re: browser within a browser in ajax?

Shog⁹20-Mar-06 10:37

Shog⁹

20-Mar-06 10:37

Uh, sure, use <IFRAME>.

Now taking suggestions for the next release of CPhog...

I'm old and.. What ya expect from me!

Just me at will_george...something20-Mar-06 9:17

Just me at will_george...something

20-Mar-06 9:17

I'm old and.. What ya expect from me! 14:53 20 Mar '06
First a bit about me..

I'm in the USA (I say that because folks seem to hate us) a nobody, and really old.. My first project was writing some code for a Intel 2004.. Late 1960? I forget.

I download ALOT of your posts I find in here.. I never do anything with them but look/run it if I can.. I just gasp in amazement on what you guys/gals do.. You are SMART!

Thanks for sharing your knowledge!

I have a real question (Well to me it is real).. I have a web cam and I made a little html page to download images at different time intervals. Just HTML and Javascript. I want to save them to my local hard drive.. I KNOW/think I am not allowed to do that BUT there must be some way!

YOU CAN DO IT!

NO! I DO NOT want to rip off sombody elses hard work out on the web.. Just for use on my local home network (I do not want to use SQL or other database) Just to a folder on my hard drive (shared) that I can access remotely or at home.. Does this make and sense?

If it matters.. Just a JUNK D-LINK DCS-900W that has it's own server..(works but BAD pictures..... Sort of like my old eyes.. both together makes the PIC really bad!)... I can get the image (JPG). I am just not smart enough to save them someplace! I was trying to automate the Microsoft IE image toolbar that pops up over a image.. Yes I can do it manually (but what if i'm not there?) I gave up trying!.. Yes' I know.. everybody knocks IE as trash.. Well does what I want! and never had any problems YET!

All I have to work with is Microsoft C++ 6 and Microsoft Visual Studio 2002?
I just LOVE C#.. Basic... what is that?

I have a C# program I'd post as a good laugh for everybody.. But I don't know how.. Just something I did for a college class.. The instructor gave me a 'A' and NEVER looked at my code! Just the output... LOL..

Well, thanks for listening! HAVE A GREAT DAY!

As I would say.. Just me... will_george@sbcglobal.net.. Yes it is a real address. I have nothing to hide.. By the time I get it right I'll be dead!

Re: I'm old and.. What ya expect from me!

George L. Jackson20-Mar-06 15:36

George L. Jackson

20-Mar-06 15:36

I read your message and had a bonding moment! I wrote my first program in FORTRAN in 1968 using a key punch. So, I may be around your age. However, I kept up with the technology over the years and I have created several Windows and Web applications in C++/CLI and C#.

Unfortunately, I have not used a web camera before and cannot help you with your problem. However, web browsers usually cache images on your local computer. If you right-click on your Internet Explorer Icon on the desktop and choose properties on the menu. Click on the "General" tab and click on the "Settings..." button. When the "Settings" windos appears, click on the "View Files..." button. You can sort the images my url.

-- modified at 22:19 Monday 20th March, 2006

ArrayList and JavaScript

livez20-Mar-06 4:48

20-Mar-06 4:48

Hello!

I have two listboxes, one is filled with data when page is loaded, and the other is empty. When user clicks a button I want the selected items from one of them to show up in the other. I'd love to have a non-postback solution of this, as all the postbacks required with my current solution doesn't feel very userfriendly. Here's the code how it looks today:

private void btnOppenVard_Click(object sender, System.EventArgs e)<br />
{<br />
	ArrayList alTotal = new ArrayList();<br />
	ArrayList alOld = new ArrayList();<br />
	ArrayList alNew = new ArrayList();<br />
<br />
             // Items already existing in listbox2<br />
	foreach(ListItem li in lblValdOppenVard.Items)<br />
	{<br />
		alOld.Add(li.Value.ToString());<br />
	}<br />
			<br />
	alTotal.AddRange(alOld);<br />
         <br />
             // items selected in listbox1<br />
	foreach(ListItem li in lbOppenVard.Items)<br />
	{<br />
				if(li.Selected == true)<br />
		{<br />
			alNew.Add(li.Value.ToString());<br />
		}<br />
	}<br />
<br />
            // Remove dublicates<br />
	foreach (System.Object obj in alNew)<br />
	{<br />
				if(alTotal.Contains(obj.ToString()))<br />
		{<br />
			alTotal.Remove(obj);<br />
		}<br />
	}<br />
  <br />
	alTotal.AddRange(alNew);<br />
<br />
             // bind data<br />
	lblValdOppenVard.DataSource = alTotal;<br />
	lblValdOppenVard.DataBind();<br />
}

Is this possible to achieve with javascript? And could someone point me in the right direction as to how I should go about doing this?

George L. Jackson20-Mar-06 15:56

George L. Jackson

20-Mar-06 15:56

The listbox renders as a "select" element on the client-side. Look on a search web site such as www.google.com or Code Project using "DHTML" and "SELECT" as key words.

sharma sanjeev20-Mar-06 17:03

20-Mar-06 17:03

try this

function MoveOption(objSourceElement, objTargetElement) { var aryTempSourceOptions = new Array(); var x = 0; //looping through source element to find selected options for (var i = 0; i < objSourceElement.length; i++) { if (objSourceElement.options[i].selected) { //need to move this option to target element var intTargetLen = objTargetElement.length++; objTargetElement.options[intTargetLen].text = objSourceElement.options[i].text; objTargetElement.options[intTargetLen].value = objSourceElement.options[i].value; } else { //storing options that stay to recreate select element var objTempValues = new Object(); objTempValues.text = objSourceElement.options[i].text; objTempValues.value = objSourceElement.options[i].value; aryTempSourceOptions[x] = objTempValues; x++; } } //resetting length of source objSourceElement.length = aryTempSourceOptions.length; //looping through temp array to recreate source select element for (var i = 0; i < aryTempSourceOptions.length; i++) { objSourceElement.options[i].text = aryTempSourceOptions[i].text; objSourceElement.options[i].value = aryTempSourceOptions[i].value; objSourceElement.options[i].selected = false; }

sanjeev

livez20-Mar-06 21:05

20-Mar-06 21:05

brilliant, it worked like a charm! thanks alot

sharma sanjeev21-Mar-06 16:55

21-Mar-06 16:55

take a hidden fields to store data and their corresponding id,s

try this
Add this function to attributes of your button as
this.btnSubmit.Attributes.Add("onclick","javascript return showSelected();");

targetlistId is id of target list
'hiddennames' is input type hidden for names
'hiddenId' is input type hidden for id's

function showSelected()
{
var optionList = document.getElementById("targetlistId").options;
var data = '';
var names = '';
var len = optionList.length;
for(i=0; i{
if(i>0)
{
data += ',';
names += ',';
}
data += optionList.item(i).value;
names += optionList.item(i).text;
}
document.getElementById('hiddennames').value=names;
document.getElementById('hiddenId').value=data;
return true;
}

sanjeev

livez21-Mar-06 22:24

21-Mar-06 22:24

Thanks for the responseI tried this solution, but didnt get any data to register in the the hidden field. I tried

adding attribute:
this.btnOppenVardVald.Attributes.Add("onclick","javascript: return showSelected();");

adding hidden field:
<input id="HiddenValue" type="hidden" value="Initial Value" runat="server" NAME="HiddenValue">

also tried:
<input id="HiddenValue" type="hidden" value="Initial Value" NAME="HiddenValue">

the function:

<script language="JavaScript" type="text/javascript"><br />
function showSelected()<br />
{<br />
	var optionList = document.getElementById("lblValdOppenVard").options;<br />
	var data = '';<br />
	var names = '';<br />
	var len = optionList.length;<br />
	for (var i = 0; i < optionList.length; i++)<br />
	{<br />
		if(i>0)<br />
		{<br />
			data += ',';<br />
			names += ',';<br />
		}<br />
		data += optionList.item(i).value;<br />
		names += optionList.item(i).text;<br />
	}<br />
	document.getElementById('HiddenValue').value=names;<br />
	return true;<br />
} <br />
</script>

but value of HiddenValue is still "Initial Value" after I press btnOppenVardVald. Should "HiddenValue" have runat="server" or not? And what else am I doing wrong?

sharma sanjeev21-Mar-06 22:31

21-Mar-06 22:31

no run at server for listbox

<asp:listbox id="lstCategories2" cssclass="SearchCategory" runat="server"
="" enableviewstate="True">

livez21-Mar-06 22:38

21-Mar-06 22:38

if I remove the runat server for the listbox, its not rendered at all.

asp:listbox id="lblValdOppenVard" runat="server" CssClass="inmatningstext" SelectionMode="Multiple"

Do I have to create some sort of html control instead of an asp:listbox? Im sorry if the answer is obvious, im kind of new to this.

-- modified at 4:40 Wednesday 22nd March, 2006

livez21-Mar-06 22:56

21-Mar-06 22:56

working now, thanks for the help everybody, sanju sharma in particular!

sharma sanjeev21-Mar-06 23:06

21-Mar-06 23:06

my mistake dont remove runat server
use

and add it in .cs page as html control

like

protected System.Web.UI.HtmlControls.HtmlInputHidden hiddenLinkTypeId;

and get value of hidden as
string ids=hiddenLinkTypeId.Value;

sanjeev

Guffa21-Mar-06 22:43

Guffa

21-Mar-06 22:43

As this is client side code, the runat="server" attribute is totally irrelevant.

This is the way you add the attribute:

this.btnOppenVardVald.Attributes.Add("onclick","return showSelected();");

---
b { font-weight: normal; }

sharma sanjeev21-Mar-06 16:53