Develop Reference

Hide div having variable dynamic ID

The div is a switch which gets a dynamic ID .
class name is impbtn , id is generated in variable this.impbtn6.id
HTML:
<div id="widget-id63032Candy_Eaten_importGoodsBtn" class="impbtn"></div>
There are two places hide is required - click and onload
In click event
document.getElementById(this.impbtn6.id).style.visibility="hidden";
works fine .
I cannot use Document.getelementbyID , as multiple form loads occur and button is not supposed to be hidden then .
So i trued using JQ to access css properties
This
jQuery('.impbtn, #this.impbtn6.id').css('visibility',"hidden");
works but makes all button in the class invisible . I want to make only this.expbtn6.id invisible not all ids under this class .
I have read each and every page available.Some things Iv unsuccessfully tried (Separately)
var vid= this.impbtn6.id;
jQuery("#"+ vid).visibility("hidden");
$('#vid .impbtn').css('visibility',"hidden")
var row2=$(".impbtn").find("div#"+vid);
row2.hide();
$('#vid .impbtn').css('visibility',"hidden");
$('div#vid').css('visibility',"hidden");
$('.impbtn', $("#div" + this.impbtn6.id)).css('visibility',"hidden");
$("#div"+ vid).css('visibility',"hidden");
$("#"+ vid).hide();
$('#vid').css('visibility',"hidden");
row = $('#' + vid);
row.css('visibility',"hidden");
I would highly appreciate a reply/comment.

your question is a little confusing as you say
document.getElementById(this.exportbtn6.id).style.visibility="visible";
works fine but this code shows the div, not hides it, and why cannot the same code be used to hide if you use it to show?
then your other snippet that supposedly works:
jQuery('.expbtn, #this.exportbtn6.id').css('visibility',"visible");
cannot work because #this.exportbtn6.id will not resolve to the variable's content inside the double quotes, so i am pretty sure this line will not do anything.
The way to do this correctly is
jQuery('#' + this.exportbtn6.id + '.expbtn').hide();
but i cannot tell for sure as the question is not clear. If my understanding of your question is correct, the above line will do the trick. Keep in mind that the value of "this" will differ based on context, so it maybe that you are referencing the wrong "this".

Try this
$('#this.exportbtn6.id').css('visibility','visible');

With jQuery:
$("#"+this.expbtn6.id).hide();
I hope it helps.

Create a region on HTML with changing values

I am a beginner in HTML and I want to create a region on a HTML page where the values keep on changing. (For example, if the region showed "56" (integer) before, after pressing of some specific button on the page by the user, the value may change, say "60" (integer) ).
Please note that this integer is to be supplied by external JavaScript.
Efforts I have put:
I have discovered one way of doing this by using the <canvas> tag, defining a region, and then writing on the region. I learnt how to write text on canvas from http://diveintohtml5.info/canvas.html#text
To write again, clear the canvas, by using canvas.width=canvas.width and then write the text again.
My question is, Is there any other (easier) method of doing this apart from the one being mentioned here?
Thank You.

You can normally do it with a div. Here I use the button click function. You can do it with your action. I have use jquery for doing this.
$('.click').click(function() {
var tempText = your_random_value;
// replace the contents of the div with the above text
$('#content-container').html(tempText);
});

You can edit the DOM (Document Object Model) directly with JavaScript (without jQuery).
JavaScript:
var number = 1;
function IncrementNumber() {
document.getElementById('num').innerText = number;
number++;
}
HTML:
<span id="num">0</span>
<input type='button' onclick='IncrementNumber()' value='+'/>
Here is a jsfiddle with an example http://jsfiddle.net/G638z/

Change the contents of the element's onclick function

I know it is possible to change different parts of an element such as class, value and html content.
What I am looking for is a way to change the values of the function call itself.
document.getElementById(id).onclick = "javascript:FUNCTION('"+id+"','0');";
The second pass value is what I will be changing. So value "0" can be for example "1" or "2"
Is this possible?
EDIT:
In case this gets going down the wrong road.....
This is what I will be changing with that code.
So then the page ( and script ) is ready to run again with new values
<div id="id" class="stuff" onclick="javascript:function('id','0');" style="cursor:pointer;">
hope that clarifies things a bit more.
RE-EDIT:
Well seems this might not be possible. So will start looking at ways round.

It depends on what you are trying to do, but here is a way of doing it which would not even require the changing of the function.
var myValue = 0
document.getElementById("test").onclick = function (aEvent) {
myValue++;
alert(myValue);
}
See fiddle: http://jsfiddle.net/AqZHZ/

Text not changing in jQuery

I seem to be doing something wrong in the following code: http://jsfiddle.net/yunowork/qKj6b/1/
When you click next, the text within the span .hiddentext should be displayed in the span .showtext on top and correspond to the right Race (Rn). For example when R3 is highlighted the content of that .hiddentext "Race 3Oregon 14:30" should be displayed within the span .showtext.
This is the line where I make a mistake:
$('.showtext').text($('.hiddentext').first('td:first').text());
What am I doing wrong here?

Let's start simple:
Your problem:
$('.showtext').text($('.hiddentext').first('td:first').text());
you are saing, that, grab all .hiddentext, choose the first that has a td ... witch is not what you have in code, you have, td that contains hiddentext... so, the other way around.
What you want to do is simply get the current NEXT td and grab the hiddentext, so, just change to:
$('.showtext').text($nextCol.find('.hiddentext').text());
Now, can you see that the <br/> is not correctly rendered? That's because you are setting the text property, and you should set the html property.
the final code should be something like:
$('.showtext').html($nextCol.find('.hiddentext').html());
live example: http://jsfiddle.net/qKj6b/8/
Your code:
every time you need to have placeholders to provide some data to a context, please, DO NOT USE HTML TAGS to hold such values and hide them... make the use of the data- attribute, witch is a HTML5 complience, and works very well in any browser even if it does not have not HTML5 support, like IE6.
your table definition (td) that currently is:
<td class="visible" id="r2">
<span class="hiddentext">Race 2<br />Santa Fe 12:00</span>
<strong>R2</strong>
</td>
should be something like:
<td class="visible" id="r2" data-text="Race 2<br />Santa Fe 12:00">
R2
</td>
witch is way easier to read, and from your javascript code, you can easily get this as:
var hiddenText = $nextCol.data("text");
Your code (part 2):
This one is quite simple to know
Every time you are repeating yourself, you're doing it wrong
You have the methods for Next and Prev almost exactly as each other, so, you are repeating everything, for this, you should refactor your code and just use one simple method, this way, any future change only happens in one place, and one place only.
$(".next").click(function(e){
e.preventDefault();
var $nextCol = $('.highlighted').next('td');
MoveCursor($nextCol, 'next');
});
$(".previous").click(function(e){
e.preventDefault();
var $prevCol = $('.highlighted').prev('td');
MoveCursor($prevCol, 'prev');
});
function MoveCursor(col, side) {
var maxCol = 8;
if((side === 'next' && col.length != 0) ||
(side == 'prev' && col.length != 0 && col.index() >= maxCol)) {
$('.highlighted').removeClass("highlighted");
col.addClass("highlighted");
// show current title
$('.showtext').html(col.data('text'));
if (col.hasClass("invisible")) {
col.removeClass("invisible");
col.addClass("visible");
var $toRem;
if(side == 'prev')
$toRem = col.next('td').next('td').next('td').next('td').next('td').next('td');
else
$toRem = $nextCol.prev('td').prev('td').prev('td').prev('td').prev('td').prev('td');
$toRem.removeClass("visible");
$toRem.addClass("invisible");
}
}
}
Live Example: http://jsfiddle.net/qKj6b/22/

It should be
$('.showtext').html($('.highlighted .hiddentext').html());
Similar for the prev link...
or even better, thanks to #balexandre:
$('.showtext').html($nextCol.find('.hiddentext').html());
$('.showtext').html($prevCol.find('.hiddentext').html());
Fiddle
Update to match #balexandre hint: Fiddle 2

Do the following:
var $currCol = $('.highlighted'); //to get the current column
$('.race strong').text($currCol.closest('.highlighted').first('td:first').text());

.hiddentext class selects all the spans and the first() will always return you the first td.
Just make sure you select .hiddentext from the currently highlighted column and you are good to go.
$('.showtext').text($('.highlighted .hiddentext').first('td:first').text());

Try this (Same for both)
$('.showtext').html($currCol.find('span.hiddentext').html());
Working Example.

Javascript id question

I have a beginner question. I have a shoutbox, an Ajax shoutbox.
I made a form where i can update the users depending on them being a DJ or not.
If that option is selected then a small image appears after the user's name.
Is working but I can't make it work but my problem is, that if I set it on my profile, it adds the image to everybody's name.
Here is my code:
var radios = document.getElementById("radios");
if(radios.innerHTML == 'yes') {
radios = "<img src='http://www.site/pic/radios.gif'>";
}
My question is: How to insert the current user's id in this if statement?

In the code sample you've included, there appears to be an error.
With this line of code:
var radios = document.getElementById("radios");
you get the DOM object that has an id="radios". Then, you try to set that same variable to be a piece of HTML:
radios = "<img src='http://site/pic/radios.gif'>";
That won't accomplish anything other than setting a variable that you were previously using to store a DOM object to now be a string. That line of code does not modify the DOM in any way. Did you mean to write it this way?
radios.innerHTML = "<img src='http://site/pic/radios.gif'>";