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how to show div using it's ID and change the visibility from none to block? [closed]

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i need a javascript code that gets a hidden div by Id and changes the style from display:none; to display:block; .
HTML:
<div id="post-author" style="display:none;">by samuel</div>
every post in my site has that html code on beginning. how can i be able to print or show element by it's Id ? thanks !

<script>document.getElementById("post-author").style.display="block";</script>
This will do what you're after :) Just put that in the head of your site

This has been answered a million times before... but here you go:
document.getElementById('post-author').style.display = 'none';
and
document.getElementById('post-author').style.display = 'block';

Get value using data [closed]

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I need get a value using jquery "data()". but I need to do it by doing something like this. So please give me an idea . Thank you in advance.
//html
<div id="myid" data-cityid="Colombo" ></div>
var name = "cityid";
$("#myid").data(""+name+""); // this way not working :(

Your are trying to get attribute, use attr() for it with complete name of attribute:
var name = "data-cityid";
alert($("#myid").attr(name));
Here is demo

You try to use attr():
To get:
$("#myid").attr('data-cityid');
To set:
$("#myid").attr('data-cityid', name);

Try with attr.
$("#myid").attr("data-"+name);

How to read the control id and title inside a span by jquery [closed]

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I have a input text box inside a span . Can anyone help me how to read the input id
<SPAN class=span1><INPUT id=name class="textobx" title=name value=U maxLength=1 ></SPAN>
How will I read the id and title of the input .
Please help me in finding this.
Thanks

Can you try this,
$(function(){
var id = $('span input').attr('id');
var title= $('span input').attr('title');
});
Also, you need to include jquery library

You need to do like this,
var id=$('span input').attr('id');
var tit=$('span input').attr('title');
Which will retrieve the id and title of input tag inside the span.
FIDDLE DEMO

Change background body images with onclick [closed]

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I'm new at javascript and jQuery and I want to use one of those to change my background body images with onclick. Exactly what I want is to create a link with an image so when the people click on it the background body pic will change. Can you help me or give me a simple example.

HTML
<img src="/path/to/image.jpg">Select Image
Javascript
$(document).on('click', 'a.set-background', function(){
$('body').css({
'background' : 'url(' + $(this).find('img').attr('src') + ')'
});
return false;
});

HTML:
<button>Change background</button>
jQuery:
$('button').click(function(){
$('body').css('background-image','image.jpg');
});

Unhiding Row using jQuery toggle [closed]

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http://jsfiddle.net/PF8nL/1/
Using the code in the above jsfiddle I am unable to unhide and hide a row using jQuery. According to this stack answer it seems I am doing this correctly.
Do I have some stupid error? possibly causing this?
Code:
$('input[name="custom_rejection_option"]').click(function() {
$('.custom_reject_area').toggle(this.checked);
}};

You had a syntax error
$('input[name="custom_rejection_option"]').click(function () {
$('.custom_reject_area').toggle(this.checked);
});
//You had `}` instead of the closing `)`

You just had some typos and things.
$('input[name=custom_rejection_option]').click(function() {
$('.custom_reject_area').toggle(this.checked);
});
http://jsfiddle.net/PF8nL/5/