How do i getElementById("a") and add a class to it, using JavaScript,halfway there?

[SM]

Hello, i need to add a classname to an element <ausing JavaScript.
I've tried a couple of thing with no success.


This is an small piece of my code:
....
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
....

<img id="cover" src="<?php echo $cd_cover; ?>" alt="" /></div>


function show_picture(pi cture) {
var source = picture.getAttr ibute("href");
var cover = document.getEle mentById("cover ");

cover.setAttrib ute("src", source);

//??????doesnt work
var el_a = document.getEle mentById("a");
el_a.className = "here";
}

Any ideas?

Thanks
Marco

[Gregor Kofler]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, using JavaScript,half way there?

SM meinte:

Hello, i need to add a classname to an element <ausing JavaScript.
I've tried a couple of thing with no success.
>
>
This is an small piece of my code:
...
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
...
>
<img id="cover" src="<?php echo $cd_cover; ?>" alt="" /></div>
>
>
function show_picture(pi cture) {
var source = picture.getAttr ibute("href");
var cover = document.getEle mentById("cover ");
>
cover.setAttrib ute("src", source);
>
//??????doesnt work
var el_a = document.getEle mentById("a");
el_a.className = "here";
}

As expected. Use other methods to get element references, like
getElementsByTa gName() (returns a collection of elements with a given
name), or give your element a name or id and access it with
getElementById( ) or getElementsByNa me().

Gregor


--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum

[sheldonlg]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, using JavaScript,half way there?

Gregor Kofler wrote:

SM meinte:

>Hello, i need to add a classname to an element <ausing JavaScript.
>I've tried a couple of thing with no success.
>>
>>
>This is an small piece of my code:
>...
><li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
>return false;">image 1</a></li>
><li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
>return false;">image 2</a></li>
>...
>>
><img id="cover" src="<?php echo $cd_cover; ?>" alt="" /></div>
>>
>>
>function show_picture(pi cture) {
>var source = picture.getAttr ibute("href");
>var cover = document.getEle mentById("cover ");
>>
>cover.setAttri bute("src", source);
>>
>//??????doesnt work
>var el_a = document.getEle mentById("a");
>el_a.classNa me = "here";
>}

>
As expected. Use other methods to get element references, like
getElementsByTa gName() (returns a collection of elements with a given
name), or give your element a name or id and access it with
getElementById( ) or getElementsByNa me().
>
Gregor
>
>

Expanding upon what you said:

He did that for cover:

<img id="cover" src="<?php echo $cd_cover; ?>" alt="" />
var cover = document.getEle mentById("cover ");
cover.setAttrib ute("src", source);

But he didn't have an element id="a" for the

var el_a = document.getEle mentById("a");

[SM]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, usingJavaScript , halfway there?

On May 28, 5:20 pm, Gregor Kofler <use...@gregork ofler.atwrote:

SM meinte:
>
>
>

Hello, i need to add a classname to an element <ausing JavaScript.
I've tried a couple of thing with no success.

>

This is an small piece of my code:
...
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
...

>

<img id="cover" src="<?php echo $cd_cover; ?>" alt="" /></div>

>

function show_picture(pi cture) {
var source = picture.getAttr ibute("href");
var cover = document.getEle mentById("cover ");

>

cover.setAttrib ute("src", source);

>

//??????doesnt work
var el_a = document.getEle mentById("a");
el_a.className = "here";
}

>
As expected. Use other methods to get element references, like
getElementsByTa gName() (returns a collection of elements with a given
name), or give your element a name or id and access it with
getElementById( ) or getElementsByNa me().
>
Gregor
>
--http://photo.gregorkof ler.at::: Landschafts- und Reisefotografie http://web.gregorkofle r.com ::: meine JS-Spielwiesehttp://www.image2d.com ::: Bildagentur für den alpinen Raum

getElementByTag Name doesn't work for me. getElementById does work ok.
I can't imagine having 30+ <aand give an 'id' tag for each. That's
just BAD programing in my opinion.
That's why i was looking for a general rule. Since i'm passing 'this'
in the function as a parameter, i was wondering if i could get the
parent or something similar and then add a class name. But then again,
i will need a way to undo that classname when i select another <a>.

I did more research and came up with this:

<ul id="nav_cd_imgs ">
...
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
...
</ul>


var els_a =
document.getEle mentById("nav_c d_imgs").getEle mentsByTagName( "a").length ;

//testing purposes
alert(els_a);

//switch off all className in all <a>
for (i=0; i<els_a; i++) {
?????
}

//switch on the <aselected with a className
????


I just need to find how to get the <aselected. Any hints, meanwhile,
i'll continue searching the web and post the answer here if i find
something.


Thanks
Marco

[Gregor Kofler]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, using JavaScript,half way there?

SM meinte:

>--http://photo.gregorkof ler.at::: Landschafts- und Reisefotografie http://web.gregorkofle r.com ::: meine JS-Spielwiesehttp://www.image2d.com ::: Bildagentur für den alpinen Raum

Please, don't quote signatures.

getElementByTag Name doesn't work for me.

It is getElement*s*By TagName()

getElementById does work ok.
I can't imagine having 30+ <aand give an 'id' tag for each. That's
just BAD programing in my opinion.

What do you expect? How would your original approach have distinguished
between the different anchor-elements?

That's why i was looking for a general rule. Since i'm passing 'this'
in the function as a parameter, i was wondering if i could get the
parent or something similar and then add a class name. But then again,
i will need a way to undo that classname when i select another <a>.

I did more research and came up with this:
>
<ul id="nav_cd_imgs ">
...
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
...
</ul>

Untested:

function show_picture(cl icked_a) {

>
var els_a =
document.getEle mentById("nav_c d_imgs").getEle mentsByTagName( "a").length ;

var els_a =
document.getEle mentById("nav_c d_imgs").getEle mentsByTagName( "a");

//testing purposes
alert(els_a);
>
//switch off all className in all <a>
for (i=0; i<els_a; i++) {

for(var i = els_a.length; i--;) {
if(els_a[i].className == "foo") {
els_a[i].className = "bar";
}
if(els_a[i] == clicked_a) {
els_a[i].className = "foo";
}
}


Gregor


--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum

[SM]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, usingJavaScript , halfway there?

On May 28, 6:39 pm, Gregor Kofler <use...@gregork ofler.atwrote:

SM meinte:
>

--http://photo.gregorkof ler.at:::Landsc hafts- und Reisefotografie http://web.gregorkofle r.com::: meine JS-Spielwiesehttp://www.image2d.com ::: Bildagentur für den alpinen Raum

>
Please, don't quote signatures.
>

getElementByTag Name doesn't work for me.

>
It is getElement*s*By TagName()
>

getElementById does work ok.
I can't imagine having 30+ <aand give an 'id' tag for each. That's
just BAD programing in my opinion.

>
What do you expect? How would your original approach have distinguished
between the different anchor-elements?
>

That's why i was looking for a general rule. Since i'm passing 'this'
in the function as a parameter, i was wondering if i could get the
parent or something similar and then add a class name. But then again,
i will need a way to undo that classname when i select another <a>.
I did more research and came up with this:

>

<ul id="nav_cd_imgs ">
...
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 1</a></li>
<li><a href="<?php echo $cd_img; ?>" onClick="show_p icture(this);
return false;">image 2</a></li>
...
</ul>

>
Untested:
>
function show_picture(cl icked_a) {
>
>
>

var els_a =
document.getEle mentById("nav_c d_imgs").getEle mentsByTagName( "a").length ;

>
var els_a =
document.getEle mentById("nav_c d_imgs").getEle mentsByTagName( "a");
>

//testing purposes
alert(els_a);

>

//switch off all className in all <a>
for (i=0; i<els_a; i++) {

>
for(var i = els_a.length; i--;) {
if(els_a[i].className == "foo") {
els_a[i].className = "bar";
}
if(els_a[i] == clicked_a) {
els_a[i].className = "foo";
}

Gregor,
Awesome! I've try it and it works perfectly! Many thanks.
My mistake, i didn't not explain correctly what i was searching for.
At the end, it all work out for the best!

Thanks again
Marco

[Thomas 'PointedEars' Lahn]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, using JavaScript,half way there?

Gregor Kofler wrote:

SM meinte:

>Hello, i need to add a classname to an element <ausing JavaScript.
>I've tried a couple of thing with no success.
>[...]
>//??????doesnt work
>var el_a = document.getEle mentById("a");
>el_a.classNa me = "here";
>}

>
As expected. Use other methods to get element references, like
getElementsByTa gName() (returns a collection of elements with a given
name), [...]

A given *tag* name, or better: element type.

getElementById( ) or getElementsByNa me().

Yes, *these* are about element's IDs and names.


PointedEars
--
realism: HTML 4.01 Strict
evangelism: XHTML 1.0 Strict
madness: XHTML 1.1 as application/xhtml+xml
-- Bjoern Hoehrmann

[Gregor Kofler]

Re: How do i getElementById( &quot;a&quot ;) and add a class to it, using JavaScript,half way there?

Thomas 'PointedEars' Lahn meinte:

Gregor Kofler wrote:

>SM meinte:

>>Hello, i need to add a classname to an element <ausing JavaScript.
>>I've tried a couple of thing with no success.
>>[...]
>>//??????doesnt work
>>var el_a = document.getEle mentById("a");
>>el_a.classNam e = "here";
>>}

>As expected. Use other methods to get element references, like
>getElementsByT agName() (returns a collection of elements with a given
>name), [...]

>
A given *tag* name, or better: element type.

Typo. Could cause some confusion. Sorry.

Gregor



--
http://photo.gregorkofler.at ::: Landschafts- und Reisefotografie
http://web.gregorkofler.com ::: meine JS-Spielwiese
http://www.image2d.com ::: Bildagentur für den alpinen Raum