Disable Button With Javascript

[Joey]

Hello,

In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.

I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...

document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;

Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.

Why does the button remain enabled when viewing the page with Firefox?

[Cowboy \(Gregory A. Beamer\)]

Re: Disable Button With Javascript

YOu need to actually query, in code behind, to determine what the postback
event is for the control and emit the JavaScript accordingly. I am not sure
this conquers all Firefox issues, but it guarantees a proper path down the
rabbit hole even if you rename the control for some reason. I do not have a
sample for this.

If you have to go absolutely generic, you can get the control that posted
from Request["EVENTTARGE T"], but this does not work with all controls.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

*************** *************** *************** ****
Think outside of the box!
*************** *************** *************** ****
"Joey" <joey.powell@to pscene.comwrote in message
news:1158761838 .874393.207660@ h48g2000cwc.goo glegroups.com.. .

Hello,
>
In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.
>
I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...
>
document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;
>
Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.
>
Why does the button remain enabled when viewing the page with Firefox?
>

[Brennan Stehling]

Re: Disable Button With Javascript

Joey,

This code works for me. Be sure to declare your DTD as XHTML 1.1
Transitional. You may find that helps because the way the disabled
attribute was handled has changed since the HTML 3.2 spec.

<script type="text/javascript">
<!--
function disableButton(b uttonId) {
if (document.all) {
var btn = document.all[buttonId; btn.disabled = 'true';
}
else {
var btn = document.getEle mentById(button Id); btn.disabled = 'true';
}
}
// -->
</script>

....

<!-- After button is defined -->
<script type="text/javascript">
disableButton(' ct100_ContentPl aceHolder1_btnC ontinue');
</script>


Brennan Stehling

http://brennan.offwhite.net/blog/

Joey wrote:

Hello,
>
In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.
>
I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...
>
document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;
>
Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.
>
Why does the button remain enabled when viewing the page with Firefox?

[bruce barker \(sqlwork.com\)]

Re: Disable Button With Javascript

document.all is an IE only collection, it does not exist in the w3c
standard, so it works in ie only. use the w3c standard:

document.getEle mentById('ct100 _ContentPlaceHo lder1_btnContin ue').disabled =
true;

-- bruce (sqlwork.com)

"Joey" <joey.powell@to pscene.comwrote in message
news:1158761838 .874393.207660@ h48g2000cwc.goo glegroups.com.. .

Hello,
>
In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.
>
I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...
>
document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;
>
Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.
>
Why does the button remain enabled when viewing the page with Firefox?
>

[Joey]

Re: Disable Button With Javascript

Can you provide a simple example as to how to query, in code behind,
for the correct id?

Cowboy (Gregory A. Beamer) wrote:

YOu need to actually query, in code behind, to determine what the postback
event is for the control and emit the JavaScript accordingly. I am not sure
this conquers all Firefox issues, but it guarantees a proper path down the
rabbit hole even if you rename the control for some reason. I do not have a
sample for this.
>
If you have to go absolutely generic, you can get the control that posted
from Request["EVENTTARGE T"], but this does not work with all controls.
>
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
>
*************** *************** *************** ****
Think outside of the box!
*************** *************** *************** ****
"Joey" <joey.powell@to pscene.comwrote in message
news:1158761838 .874393.207660@ h48g2000cwc.goo glegroups.com.. .

Hello,

In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.

I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...

document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;

Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.

Why does the button remain enabled when viewing the page with Firefox?

[Joey]

Re: Disable Button With Javascript

Okay, I changed it to...

document.getEle mentById('ct100 _ContentPlaceHo lder1_btnContin ue').disabled=t rue

Now it still works fine in IE, and it still doesn't work in Firefox.

Any other ideas, anyone?


bruce barker (sqlwork.com) wrote:

document.all is an IE only collection, it does not exist in the w3c
standard, so it works in ie only. use the w3c standard:
>
document.getEle mentById('ct100 _ContentPlaceHo lder1_btnContin ue').disabled =
true;
>
-- bruce (sqlwork.com)
>
"Joey" <joey.powell@to pscene.comwrote in message
news:1158761838 .874393.207660@ h48g2000cwc.goo glegroups.com.. .

Hello,

In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.

I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...

document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;

Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.

Why does the button remain enabled when viewing the page with Firefox?

[Joey]

Re: Disable Button With Javascript

Okay, nevermind. I cleared the cache in Firefox, and now it works.
Thanks a lot!
Joey wrote:

Okay, I changed it to...
>
document.getEle mentById('ct100 _ContentPlaceHo lder1_btnContin ue').disabled=t rue
>
Now it still works fine in IE, and it still doesn't work in Firefox.
>
Any other ideas, anyone?
>
>
bruce barker (sqlwork.com) wrote:

document.all is an IE only collection, it does not exist in the w3c
standard, so it works in ie only. use the w3c standard:

document.getEle mentById('ct100 _ContentPlaceHo lder1_btnContin ue').disabled =
true;

-- bruce (sqlwork.com)

"Joey" <joey.powell@to pscene.comwrote in message
news:1158761838 .874393.207660@ h48g2000cwc.goo glegroups.com.. .

Hello,
>
In my C# asp.net 2.0 application, I have a webform with a button server
control on it. The webform, like most others in the site, subscribes to
a master page. I have determined that the button always renders with an
id of "ct100_ContentP laceHolder1_btn Continue" in both the IE and
Firefox browsers.
>
I created the following javascript code segment to disable it when the
page loads. I have reasons for not wanting to do this with server side
code...
>
document.all['ct100_ContentP laceHolder1_btn Continue'].disabled = true;
>
Now, when I view this in IE, the button is disabled. But when I view it
in Firefox, it's not. Also, there are no javascript errors returned by
either browser. Also, I have already updated my browserCaps section in
web.config, if that is relevant.
>
Why does the button remain enabled when viewing the page with Firefox?
>

[Mark Rae]

Re: Disable Button With Javascript

"Joey" <joey.powell@to pscene.comwrote in message
news:1158768097 .842019.240380@ h48g2000cwc.goo glegroups.com.. .

Okay, nevermind. I cleared the cache in Firefox, and now it works.

BTW, you could make your HTML more readable by giving your MasterPage(s) and
ContentPages meaningful IDs... E.g. in the code behind your MasterPage:

protected void Page_Init(objec t sender, EventArgs e)
{
this.ID = "MyMasterPa ge";
}

And then explicitly name every ContentPage in its HTML e.g.

<asp:Content ContentPlaceHol derID="MyConten tPage" runat="server">
<asp:TextBox ID="MyTextBox" runat="server" />
</<asp:Content>

Then, client side, your control will ALWAYS be called
MyMasterPage_My ContentPage_MyT extBox- this makes your life massively easier
because it means you don't have to ask ASP.NET to tell you the controls'IDs,
as you already know them.

In this way, you can use client-side JavaScript to refer to your controls in
two ways:

document.aspnet Form.MyMasterPa ge_MyContentPag e_MyTextBox

or

document.getEle mentById('MyMas terPage_MyConte ntPage_MyTextBo x')

Also, don't forget that no matter what ID you give the <formtag in your
MasterPage, ASP.NET will ALWAYS rename it to aspnetForm :-)

[Edwin Knoppert]

Re: Disable Button With Javascript

Forget that , use inline aspx code to pass the control's .ClientID property.
This is the most reliable.


"Mark Rae" <mark@markNOSPA Mrae.comschreef in bericht
news:e4xK1dN3GH A.1060@TK2MSFTN GP04.phx.gbl...

"Joey" <joey.powell@to pscene.comwrote in message
news:1158768097 .842019.240380@ h48g2000cwc.goo glegroups.com.. .
>

>Okay, nevermind. I cleared the cache in Firefox, and now it works.

>
BTW, you could make your HTML more readable by giving your MasterPage(s)
and ContentPages meaningful IDs... E.g. in the code behind your
MasterPage:
>
protected void Page_Init(objec t sender, EventArgs e)
{
this.ID = "MyMasterPa ge";
}
>
And then explicitly name every ContentPage in its HTML e.g.
>
<asp:Content ContentPlaceHol derID="MyConten tPage" runat="server">
<asp:TextBox ID="MyTextBox" runat="server" />
</<asp:Content>
>
Then, client side, your control will ALWAYS be called
MyMasterPage_My ContentPage_MyT extBox- this makes your life massively
easier because it means you don't have to ask ASP.NET to tell you the
controls'IDs, as you already know them.
>
In this way, you can use client-side JavaScript to refer to your controls
in two ways:
>
document.aspnet Form.MyMasterPa ge_MyContentPag e_MyTextBox
>
or
>
document.getEle mentById('MyMas terPage_MyConte ntPage_MyTextBo x')
>
Also, don't forget that no matter what ID you give the <formtag in your
MasterPage, ASP.NET will ALWAYS rename it to aspnetForm :-)
>

[Brennan Stehling]

Re: Disable Button With Javascript

I agree. You never know what the hiearchy will be when your pages and
controls are used. Hard-coding the names in Javascript will ensure
they break sooner or later.

What I normally do is declare Javascript variables in a static .js file
with the major of the Javascript behavior. And then with the ASP.NET
controls, I insert script blocks which set those variables.

<script ...>
var buttonId;

functions...
</script>

<!-- later from the ASP.NET control -->

<script ...>
buttonId = 'Page_Button1';
</script>

Search for RegisterScriptB lock on MSDN.

Brennan Stehling

http://brennan.offwhite.net/blog/

Edwin Knoppert wrote:

Forget that , use inline aspx code to pass the control's .ClientID property.
This is the most reliable.
>
>
"Mark Rae" <mark@markNOSPA Mrae.comschreef in bericht
news:e4xK1dN3GH A.1060@TK2MSFTN GP04.phx.gbl...

"Joey" <joey.powell@to pscene.comwrote in message
news:1158768097 .842019.240380@ h48g2000cwc.goo glegroups.com.. .

Okay, nevermind. I cleared the cache in Firefox, and now it works.

BTW, you could make your HTML more readable by giving your MasterPage(s)
and ContentPages meaningful IDs... E.g. in the code behind your
MasterPage:

protected void Page_Init(objec t sender, EventArgs e)
{
this.ID = "MyMasterPa ge";
}

And then explicitly name every ContentPage in its HTML e.g.

<asp:Content ContentPlaceHol derID="MyConten tPage" runat="server">
<asp:TextBox ID="MyTextBox" runat="server" />
</<asp:Content>

Then, client side, your control will ALWAYS be called
MyMasterPage_My ContentPage_MyT extBox- this makes your life massively
easier because it means you don't have to ask ASP.NET to tell you the
controls'IDs, as you already know them.

In this way, you can use client-side JavaScript to refer to your controls
in two ways:

document.aspnet Form.MyMasterPa ge_MyContentPag e_MyTextBox

or

document.getEle mentById('MyMas terPage_MyConte ntPage_MyTextBo x')

Also, don't forget that no matter what ID you give the <formtag in your
MasterPage, ASP.NET will ALWAYS rename it to aspnetForm :-)

[Edwin Knoppert]

Re: Disable Button With Javascript

I meant:

var o = document.getEle mentById('<%=tx t_Index.ClientI D%>');
o.value = ....


"Brennan Stehling" <offwhite@gmail .comschreef in bericht
news:1158847610 .560289.229050@ m7g2000cwm.goog legroups.com...

>I agree. You never know what the hiearchy will be when your pages and
controls are used. Hard-coding the names in Javascript will ensure
they break sooner or later.
>
What I normally do is declare Javascript variables in a static .js file
with the major of the Javascript behavior. And then with the ASP.NET
controls, I insert script blocks which set those variables.
>
<script ...>
var buttonId;
>
functions...
</script>
>
<!-- later from the ASP.NET control -->
>
<script ...>
buttonId = 'Page_Button1';
</script>
>
Search for RegisterScriptB lock on MSDN.
>
Brennan Stehling

http://brennan.offwhite.net/blog/

>
Edwin Knoppert wrote:

>Forget that , use inline aspx code to pass the control's .ClientID
>property.
>This is the most reliable.
>>
>>
>"Mark Rae" <mark@markNOSPA Mrae.comschreef in bericht
>news:e4xK1dN3G HA.1060@TK2MSFT NGP04.phx.gbl.. .

"Joey" <joey.powell@to pscene.comwrote in message
news:1158768097 .842019.240380@ h48g2000cwc.goo glegroups.com.. .
>
>Okay, nevermind. I cleared the cache in Firefox, and now it works.
>
BTW, you could make your HTML more readable by giving your
MasterPage(s)
and ContentPages meaningful IDs... E.g. in the code behind your
MasterPage:
>
protected void Page_Init(objec t sender, EventArgs e)
{
this.ID = "MyMasterPa ge";
}
>
And then explicitly name every ContentPage in its HTML e.g.
>
<asp:Content ContentPlaceHol derID="MyConten tPage" runat="server">
<asp:TextBox ID="MyTextBox" runat="server" />
</<asp:Content>
>
Then, client side, your control will ALWAYS be called
MyMasterPage_My ContentPage_MyT extBox- this makes your life massively
easier because it means you don't have to ask ASP.NET to tell you the
controls'IDs, as you already know them.
>
In this way, you can use client-side JavaScript to refer to your
controls
in two ways:
>
document.aspnet Form.MyMasterPa ge_MyContentPag e_MyTextBox
>
or
>
document.getEle mentById('MyMas terPage_MyConte ntPage_MyTextBo x')
>
Also, don't forget that no matter what ID you give the <formtag in
your
MasterPage, ASP.NET will ALWAYS rename it to aspnetForm :-)
>

>

[Mark Rae]

Re: Disable Button With Javascript

"Edwin Knoppert" <news@hellobasi c.comwrote in message
news:4513e47b$0 $2029$ba620dc5@ text.nova.plane t.nl...

var o = document.getEle mentById('<%=tx t_Index.ClientI D%>');
o.value = ....

Yes, I agree that is more robust...