jQuery changing attribute and changing it back - javascript

I want to make all links on the page unaccessible until the user clicks a button.
$('a').attr('href','#');
$("#button-yes").click(function(){
$('a').attr('href',function(){
$(this).attr('href');
});
});


How about just keeping track of state instead of rewriting all the hrefs?
var buttonClicked = false;
$('a').click(function(){
if(! buttonClicked) {
return false;
}
});
$("#button-yes").click(function(){
buttonClicked = true;
});


Have a var outside your function that says something like:
button_clicked = false;
Then use this to disable all links
$('a').click(function(){
if(!button_clicked){
return false;
}
});
Returning false will cause the link to do nothing.


The simplest example would be to hijack the click event of all links:
$('a').live('click.disable', function() {
return false;
});
$("#button-yes").click(function() {
$('a').die('click.disable');
});
(see this fiddle: http://jsfiddle.net/A6QPn/) but anyone can right-click the link and open it in new tab or something like that.
Another example would be to store the href attributes as data and restore them later:
$('a').each(function() {
var $this = $(this);
$this.data('href', $this.attr('href'));
$this.attr('href', '#');
});
$("#button-yes").click(function() {
$('a').each(function() {
var $this = $(this);
$this.attr('href', $this.data('href'));
});
});
(see this fiddle: http://jsfiddle.net/eQDdQ/) and here the links are just not working because they all point to '#' on the current page.
Another example would be to basically do the same but remove the href attribute altogether making the links look like normal text until the button is clicked:
$('a').each(function() {
var $this = $(this);
$this.data('href', $this.attr('href'));
$this.removeAttr('href');
});
$("#button-yes").click(function() {
$('a').each(function() {
var $this = $(this);
$this.attr('href', $this.data('href'));
});
});
(see this fiddle: http://jsfiddle.net/gmLTP/)


You need to stash the value of the href so that it can be recovered later. I'll stash the href value into the rel attribute.
$('a').each(function(){
$(this).attr('rel', $(this).attr('href')); //store the href values
$(this).attr('href', ''); //clear the href values
});
$("#button-yes").click(function(){
$('a').each(function(){
$(this).attr('href', $(this).attr('rel')); //recover the href values
});
});
This is a simple approach, but it leaves the address in the rel attribute. A clever user might find and use this to circumvent your button, so here's another approach as suggested by #rsp.
$('a').each(function(){
$(this).data('link', $(this).attr('href')); //store the href values
$(this).attr('href', ''); //clear the href values
});
$("#button-yes").click(function(){
$('a').each(function(){
$(this).attr('href', $(this).data('link')); //recover the href values
});
});
By storing the href using .data(), the link address is a little more obscure so users shouldn't be able to circumvent the button as easily (though disabling JavaScript will sidestep this completely).

Related

How to change the page content without reloading

I want to know how can I change the content of a div (for example: <div id="MyDiv"></div>) when I click any link for an HTML file with PHP code?
Now, I tried to do this:
$(function(){
$("a").on("click", function () {
var href = $(this).attr('href');
$("#MyDiv").load(href);
});
});
But it replaces the content of the whole page.

Yeah, I need to prevent the default action, this will do what I want:
$(function(){
$("a").on("click", function () {
event.preventDefault();
var href = $(this).attr('href');
$("#MyDiv").load(href);
});
});

Jquery - How to get elements in a list item

I have the following code:
<li class="shop-currencies">
€
£
$
R
</li>
When an item is clicked I want to set the class to the clicked item and get the ID of the item clicked. This is what I have so far:
$('.shop-currencies').click(function() {
var id = $(this).attr('id');
alert(id);
/**
* Remove the classes from the currency elements
*/
$('.shop-currencies').find('a').each(function(e) {
$(this).removeClass();
});
/**
* Set the class of the clicked element
*/
$( '#' + id).addClass('current');
});
The ID is being returned as 'undefined' How do I get the ID of the clicked link?
Thanks

You need to attach click handler to child anchor element :
$('.shop-currencies a').click(function() {
var id = $(this).attr('id');
alert(id);
/**
* Remove the classes from the currency elements
*/
$('.shop-currencies').find('a').not(this).removeClass('smclass')
/**
* Add class to current elements
*/
$(this).addClass('smclass')
});

There are a couple of options, Milind Anantwar has one, the other is to use the originally clicked element, which is passed to the event as a target property on the event argument. You can also simplify your code a lot. Please note that your bookmark anchors will cause the page to spring to the top, so also add e.preventDefault(); to any solution you choose:
$('.shop-currencies').click(function(e) {
e.preventDefault();
$('a', this).removeClass('current'); // remove related anchor current class
$(e.target).addClass('current');
});
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5Lsuazvt/
The one downside to this is that clicking inside .shop-currencies, but not on a currency link, will clear the current selection. Because of this you are better off targetting the links instead:
$('.shop-currencies a').click(function(e) {
e.preventDefault();
$(this).siblings().removeClass('current'); // remove related anchor current class
$(this).addClass('current');
});
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5Lsuazvt/1/
Which can be reduced to one line:
$('.shop-currencies a').click(function(e) {
e.preventDefault();
$(this).addClass('current').siblings().removeClass('current');
});
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5Lsuazvt/2/
Saving the best for last
And one last point... It is more efficient (but hardly noticeable) to add a single delegated event handler, instead of attaching 4 seperate handlers:
$('.shop-currencies').on('click', 'a', function(e) {
e.preventDefault();
$(this).addClass('current').siblings().removeClass('current');
});
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5Lsuazvt/3/
Final thoughts:
The IDs on the links are unnecessary if you have an appropriate this available. You can remove them from the HTML. You have the currency value you require in data-currency attributes, so you could use it like this:
$('.shop-currencies').on('click', 'a', function(e) {
e.preventDefault();
$(this).addClass('current').siblings().removeClass('current');
alert($(this).data('currency'));
});
JSFiddle: http://jsfiddle.net/TrueBlueAussie/5Lsuazvt/7/

your click, is attach to li instead of each a tag
so do $('a').click();instead

Shortest and fastest answer
$('.shop-currencies > a').click(function(){
$(this).siblings('a').removeClass('current');
$(this).addClass('current');
});
The code pen link is here, you can play with the code your self

$('.shop-currencies a').each(function() {
$(this).on("click", function(event) {
event.preventDefault();
var id = $(this).attr('id');
$('.shop-currencies a').removeClass("current");
$(this).addClass('current');
alert(id);
});
});
http://jsfiddle.net/nj37g5rm/8/

Add a class to the current active link using YUI

I got this function in jQuery:
jQuery(function() {
jQuery('.primary-nav li').each(function() {
var href = jQuery(this).find('a').attr('href');
if (href === window.location.pathname) {
jQuery(this).addClass('current');
}
});
});
but unfortunately I need to do accomplish the same with the YUI library. Add a class to the a element if the a href is the same as the current active page.
Thanks a lot!

An alternative:
YUI().use('node', function(){
Y.all('.primary-nav li').each(function(node){
var href = node.getAttribute('href');
node.toggleClass('current', href === window.location.pathname);
});
});
Adds the class if the second parameter is true, otherwise removes it.

An almost direct translation of the JQuery above would be something like:
YUI().use('node', function(){
Y.all('.primary-nav li').each(function(node){
var href = node.getAttribute('href');
if (href === window.location.pathname){
node.addClass('current');
}
});
});
However, I would imagine you could do something like:
YUI().use('node', function(){
Y.one('.primary-nav li a[href="' + window.location.pathname + '"]').addClass('current');
});
To achieve the same effect. (code tested only in my head)

jQuery: POST data without refreshing

The link is in the footer, The problem is: onclick, the page jumps to the header with a # in the address bar, is there a way to stay in the footer ?
here is my code
<span style="color: #33A13D"><i class="fa fa-hand-o-up"></i></span>
$(document).on('click', '.clickIn', function(){
var $this = $(this);
var liCount = $('#liCount');
if($(this).attr('attrIn')=='Like'){
$.post('page.php',{i:$(this).attr('id'),action:'like'},function(){
$this.html('done');
$this.attr('attrIn','');
});
}
});
Thanks

Use event.preventDefault():
$(document).on('click', '.clickIn', function(e){
e.preventDefault();
var $this = $(this);
var liCount = $('#liCount');
if($(this).attr('attrIn')=='Like'){
$.post('page.php',{i:$(this).attr('id'),action:'like'},function(){
$this.html('done');
$this.attr('attrIn','');
});
}
});
This cancel default action of browser in specific element. Check reference: http://api.jquery.com/event.preventDefault/

Yo have to modify your handler to add e.preventDefault() and e.stopPropagation():
$(document).on('click', '.clickIn', function(e){
e.preventDefault();
e.stopPropagation();
var $this = $(this);
var liCount = $('#liCount');
if($(this).attr('attrIn')=='Like'){
$.post('page.php',{i:$(this).attr('id'),action:'like'},function(){
$this.html('done');
$this.attr('attrIn','');
});
}
});
This will prevent default action for your link (follow "#" link) and stop the propagation (bubbling) of the click event.

You can prevent the default behaviour of a triggered event by calling the preventDefaultmethod of the event object. I.e.:
$(document).on('click', '.clickIn', function(event){
var $this = $(this);
var liCount = $('#liCount');
// Do this:
event.preventDefault();
if($(this).attr('attrIn')=='Like'){
$.post('page.php',{i:$(this).attr('id'),action:'like'},function(){
$this.html('done');
$this.attr('attrIn','');
});
}
});

inside click use
event.preventDefault();

preventing scroll down on hash changes or a click [duplicate]

We've got a few pages using ajax to load in content and there's a few occasions where we need to deep link into a page. Instead of having a link to "Users" and telling people to click "settings" it's helpful to be able to link people to user.aspx#settings
To allow people to provide us with correct links to sections (for tech support, etc.) I've got it set up to automatically modify the hash in the URL whenever a button is clicked. The only issue of course is that when this happens, it also scrolls the page to this element.
Is there a way to disable this? Below is how I'm doing this so far.
$(function(){
//This emulates a click on the correct button on page load
if(document.location.hash){
$("#buttons li a").removeClass('selected');
s=$(document.location.hash).addClass('selected').attr("href").replace("javascript:","");
eval(s);
}
//Click a button to change the hash
$("#buttons li a").click(function(){
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
document.location.hash=$(this).attr("id")
//return false;
});
});
I had hoped the return false; would stop the page from scrolling - but it just makes the link not work at all. So that's just commented out for now so I can navigate.
Any ideas?

Use history.replaceState or history.pushState* to change the hash. This will not trigger the jump to the associated element.
Example
$(document).on('click', 'a[href^=#]', function(event) {
event.preventDefault();
history.pushState({}, '', this.href);
});
Demo on JSFiddle
* If you want history forward and backward support
History behaviour
If you are using history.pushState and you don't want page scrolling when the user uses the history buttons of the browser (forward/backward) check out the experimental scrollRestoration setting (Chrome 46+ only).
history.scrollRestoration = 'manual';
spec
info
Browser Support
replaceState
pushState
polyfill

Step 1: You need to defuse the node ID, until the hash has been set. This is done by removing the ID off the node while the hash is being set, and then adding it back on.
hash = hash.replace( /^#/, '' );
var node = $( '#' + hash );
if ( node.length ) {
node.attr( 'id', '' );
}
document.location.hash = hash;
if ( node.length ) {
node.attr( 'id', hash );
}
Step 2: Some browsers will trigger the scroll based on where the ID'd node was last seen so you need to help them a little. You need to add an extra div to the top of the viewport, set its ID to the hash, and then roll everything back:
hash = hash.replace( /^#/, '' );
var fx, node = $( '#' + hash );
if ( node.length ) {
node.attr( 'id', '' );
fx = $( '<div></div>' )
.css({
position:'absolute',
visibility:'hidden',
top: $(document).scrollTop() + 'px'
})
.attr( 'id', hash )
.appendTo( document.body );
}
document.location.hash = hash;
if ( node.length ) {
fx.remove();
node.attr( 'id', hash );
}
Step 3: Wrap it in a plugin and use that instead of writing to location.hash...

I think I may have found a fairly simple solution. The problem is that the hash in the URL is also an element on the page that you get scrolled to. if I just prepend some text to the hash, now it no longer references an existing element!
$(function(){
//This emulates a click on the correct button on page load
if(document.location.hash){
$("#buttons li a").removeClass('selected');
s=$(document.location.hash.replace("btn_","")).addClass('selected').attr("href").replace("javascript:","");
eval(s);
}
//Click a button to change the hash
$("#buttons li a").click(function(){
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
document.location.hash="btn_"+$(this).attr("id")
//return false;
});
});
Now the URL appears as page.aspx#btn_elementID which is not a real ID on the page. I just remove "btn_" and get the actual element ID

I was recently building a carousel which relies on window.location.hash to maintain state and made the discovery that Chrome and webkit browsers will force scrolling (even to a non visible target) with an awkward jerk when the window.onhashchange event is fired.
Even attempting to register a handler which stops propogation:
$(window).on("hashchange", function(e) {
e.stopPropogation();
e.preventDefault();
});
Did nothing to stop the default browser behavior.
The solution I found was using window.history.pushState to change the hash without triggering the undesirable side-effects.
$("#buttons li a").click(function(){
var $self, id, oldUrl;
$self = $(this);
id = $self.attr('id');
$self.siblings().removeClass('selected'); // Don't re-query the DOM!
$self.addClass('selected');
if (window.history.pushState) {
oldUrl = window.location.toString();
// Update the address bar
window.history.pushState({}, '', '#' + id);
// Trigger a custom event which mimics hashchange
$(window).trigger('my.hashchange', [window.location.toString(), oldUrl]);
} else {
// Fallback for the poors browsers which do not have pushState
window.location.hash = id;
}
// prevents the default action of clicking on a link.
return false;
});
You can then listen for both the normal hashchange event and my.hashchange:
$(window).on('hashchange my.hashchange', function(e, newUrl, oldUrl){
// #todo - do something awesome!
});

A snippet of your original code:
$("#buttons li a").click(function(){
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
document.location.hash=$(this).attr("id")
});
Change this to:
$("#buttons li a").click(function(e){
// need to pass in "e", which is the actual click event
e.preventDefault();
// the preventDefault() function ... prevents the default action.
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
document.location.hash=$(this).attr("id")
});

Okay, this is a rather old topic but I thought I'd chip in as the 'correct' answer doesn't work well with CSS.
This solution basically prevents the click event from moving the page so we can get the scroll position first. Then we manually add the hash and the browser automatically triggers a hashchange event. We capture the hashchange event and scroll back to the correct position. A callback separates and prevents your code causing a delay by keeping your hash hacking in one place.
var hashThis = function( $elem, callback ){
var scrollLocation;
$( $elem ).on( "click", function( event ){
event.preventDefault();
scrollLocation = $( window ).scrollTop();
window.location.hash = $( event.target ).attr('href').substr(1);
});
$( window ).on( "hashchange", function( event ){
$( window ).scrollTop( scrollLocation );
if( typeof callback === "function" ){
callback();
}
});
}
hashThis( $( ".myAnchor" ), function(){
// do something useful!
});

Adding this here because the more relevant questions have all been marked as duplicates pointing here…
My situation is simpler:
user clicks the link (a[href='#something'])
click handler does: e.preventDefault()
smoothscroll function: $("html,body").stop(true,true).animate({ "scrollTop": linkoffset.top }, scrollspeed, "swing" );
then window.location = link;
This way, the scroll occurs, and there's no jump when the location is updated.

Erm I have a somewhat crude but definitely working method.
Just store the current scroll position in a temp variable and then reset it after changing the hash. :)
So for the original example:
$("#buttons li a").click(function(){
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
var scrollPos = $(document).scrollTop();
document.location.hash=$(this).attr("id")
$(document).scrollTop(scrollPos);
});

I don't think this is possible. As far as I know, the only time a browser doesn't scroll to a changed document.location.hash is if the hash doesn't exist within the page.
This article isn't directly related to your question, but it discusses typical browser behavior of changing document.location.hash

if you use hashchange event with hash parser, you can prevent default action on links and change location.hash adding one character to have difference with id property of an element
$('a[href^=#]').on('click', function(e){
e.preventDefault();
location.hash = $(this).attr('href')+'/';
});
$(window).on('hashchange', function(){
var a = /^#?chapter(\d+)-section(\d+)\/?$/i.exec(location.hash);
});

Save scroll position before changing url fragment.
Change url fragment.
Restore old scroll position.
let oldScrollPosition = window.scrollY;
window.location.hash = addressFragment;
window.scrollTo(0, oldScrollPosition);
It's fast, so client won't notice anything.

The other way to do this is to add a div that's hidden at the top of the viewport. This div is then assigned the id of the hash before the hash is added to the url....so then you don't get a scroll.

Here's my solution for history-enabled tabs:
var tabContainer = $(".tabs"),
tabsContent = tabContainer.find(".tabsection").hide(),
tabNav = $(".tab-nav"), tabs = tabNav.find("a").on("click", function (e) {
e.preventDefault();
var href = this.href.split("#")[1]; //mydiv
var target = "#" + href; //#myDiv
tabs.each(function() {
$(this)[0].className = ""; //reset class names
});
tabsContent.hide();
$(this).addClass("active");
var $target = $(target).show();
if ($target.length === 0) {
console.log("Could not find associated tab content for " + target);
}
$target.removeAttr("id");
// TODO: You could add smooth scroll to element
document.location.hash = target;
$target.attr("id", href);
return false;
});
And to show the last-selected tab:
var currentHashURL = document.location.hash;
if (currentHashURL != "") { //a tab was set in hash earlier
// show selected
$(currentHashURL).show();
}
else { //default to show first tab
tabsContent.first().show();
}
// Now set the tab to active
tabs.filter("[href*='" + currentHashURL + "']").addClass("active");
Note the *= on the filter call. This is a jQuery-specific thing, and without it, your history-enabled tabs will fail.

This solution creates a div at the actual scrollTop and removes it after changing hash:
$('#menu a').on('click',function(){
//your anchor event here
var href = $(this).attr('href');
window.location.hash = href;
if(window.location.hash == href)return false;
var $jumpTo = $('body').find(href);
$('body').append(
$('<div>')
.attr('id',$jumpTo.attr('id'))
.addClass('fakeDivForHash')
.data('realElementForHash',$jumpTo.removeAttr('id'))
.css({'position':'absolute','top':$(window).scrollTop()})
);
window.location.hash = href;
});
$(window).on('hashchange', function(){
var $fakeDiv = $('.fakeDivForHash');
if(!$fakeDiv.length)return true;
$fakeDiv.data('realElementForHash').attr('id',$fakeDiv.attr('id'));
$fakeDiv.remove();
});
optional, triggering anchor event at page load:
$('#menu a[href='+window.location.hash+']').click();

I have a simpler method that works for me. Basically, remember what the hash actually is in HTML. It's an anchor link to a Name tag. That's why it scrolls...the browser is attempting to scroll to an anchor link. So, give it one!
Right under the BODY tag, put your version of this:
<a name="home"></a><a name="firstsection"></a><a name="secondsection"></a><a name="thirdsection"></a>
Name your section divs with classes instead of IDs.
In your processing code, strip off the hash mark and replace with a dot:
var trimPanel = loadhash.substring(1); //lose the hash
var dotSelect = '.' + trimPanel; //replace hash with dot
$(dotSelect).addClass("activepanel").show(); //show the div associated with the hash.
Finally, remove element.preventDefault or return: false and allow the nav to happen. The window will stay at the top, the hash will be appended to the address bar url, and the correct panel will open.

I think you need to reset scroll to its position before hashchange.
$(function(){
//This emulates a click on the correct button on page load
if(document.location.hash) {
$("#buttons li a").removeClass('selected');
s=$(document.location.hash).addClass('selected').attr("href").replace("javascript:","");
eval(s);
}
//Click a button to change the hash
$("#buttons li a").click(function() {
var scrollLocation = $(window).scrollTop();
$("#buttons li a").removeClass('selected');
$(this).addClass('selected');
document.location.hash = $(this).attr("id");
$(window).scrollTop( scrollLocation );
});
});

If on your page you use id as sort of an anchor point, and you have scenarios where you want to have users to append #something to the end of the url and have the page scroll to that #something section by using your own defined animated javascript function, hashchange event listener will not be able to do that.
If you simply put a debugger immediate after hashchange event, for example, something like this(well, I use jquery, but you get the point):
$(window).on('hashchange', function(){debugger});
You will notice that as soon as you change your url and hit the enter button, the page stops at the corresponding section immediately, only after that, your own defined scrolling function will get triggered, and it sort of scrolls to that section, which looks very bad.
My suggestion is:
do not use id as your anchor point to the section you want to scroll to.
If you must use ID, like I do. Use 'popstate' event listener instead, it will not automatically scroll to the very section you append to the url, instead, you can call your own defined function inside the popstate event.
$(window).on('popstate', function(){myscrollfunction()});
Finally you need to do a bit trick in your own defined scrolling function:
let hash = window.location.hash.replace(/^#/, '');
let node = $('#' + hash);
if (node.length) {
node.attr('id', '');
}
if (node.length) {
node.attr('id', hash);
}
delete id on your tag and reset it.
This should do the trick.

This worked for me using replaceState:
$('a[href^="#"]').click(function(){
history.replaceState({}, '', location.toString().replace(/#.*$/, '') + $(this).attr('href'));
});

Only add this code into jQuery on document ready
Ref : http://css-tricks.com/snippets/jquery/smooth-scrolling/
$(function() {
$('a[href*=#]:not([href=#])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html,body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}
}
});
});

Categories

Resources