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Wordpress - Allow older and newer post buttons navigate to a ID

I am looking for a way to modify the below PHP to allow the addition of a ID that once pressed will navigate the user to the start of the blog posts instead of the top of the page.
<div class="post-navigation">
<?php next_posts_link( 'Older Posts', $wp_query ->max_num_pages); ?>
<?php previous_posts_link( 'Newer Posts' ); ?>
</div>
I feel like this is somethign that should be possible without a plugin although I have found a plugin that would allow me to do this piece of functionality.
The intended story would go something like this:
User clicks on 'older' or 'newer' button that would have in the url something like domainName.co.uk/page/2#startofposts
The user then would have the browser refresh and instead of the page being loaded at the top it would be loaded where the ID 'startofposts' would be in the DOM.
Anyone done this without a plugin?
Cheers

jQuery(document).ready(function() {
var startID = '#post-container';
var urlString = window.location;
var caseSearch = '/page/'
if(urlString.indexOf(caseSearch) != -1 {
jQuery(window).scrollTop(jQuery(startID).offset().top);
}
}
this should do the trick. There are better ways to do this but for a quick solution id should be fine.

In the end I appended the wanted ID onto the end of the anchors manually.. preventing me from having to do anything too fancy.
$('.post-navigation a').each(function () {
var current = $(this);
var href = current.attr("href");
current.attr("href", href + '#post-container');
});

addEventListener to div element

I am trying to fire a script when the contents of a div are altered, specifically when a div receives the next set of results from a js loaded paginator.
I have this:
<script script type="text/javascript" language="javascript">
document.addEventListener("DOMCharacterDataModified", ssdOnloadEvents, false);
function ssdOnloadEvents (evt) {
var jsInitChecktimer = setInterval (checkForJS_Finish, 111);
function checkForJS_Finish () {
if ( document.querySelector ("#tester")
) {
clearInterval (jsInitChecktimer);
//do the actual work
var reqs = document.getElementById('requests');
var reqVal = reqs.get('value');
var buttons = $$('.clicker');
Array.each(buttons, function(va, index){
alert(va.get('value'));
});
}
}
}
</script>
This works well when the doc loads (as the results take a few seconds to arrive) but I need to narrow this down to the actual div contents, so other changes on the page do not fire the events.
I have tried:
var textNode = document.getElementById("sitepage_content_content");
textNode.addEventListener("DOMCharacterDataModified", function(evt) {
alert("Text changed");
}, false);
But the above does not return anything.
Can what I am trying to do be done in this way? If yes where am I going wrong?
Using Social Engine (Zend) framework with MooTools.

I did this in the end with a little cheat :-(
There is a google map loading on the page that sets markers to match the location of the results. So I added my events to the end this code namely: function setMarker() {}.
I will not mark this as the correct answer as it is not really an answer to my question, but rather a solution to my problem, which is localised to the Social engine framework.
I will add a Social engine tag to my original question in the hope it may help someone else in the future.
Thanks guys.

.removeClass not functioning within .replaceWith

I'm trying to make a button that will hide a specific -- and then replace it with another hidden . However, when I test the code, everything fires correctly except for the .removeClass which contains the "display: none."
Here is the code:
<script type="text/javascript">
$(document).ready(function(){
var webform = document.getElementById('block-webform-client-block-18');
var unmarriedbutton = document.getElementById('unmarried');
var buyingblock = document.getElementById('block-block-10');
$(unmarriedbutton).click(function () {
$(buyingblock).fadeOut('slow', function() {
$(this).replaceWith(function () {
$(webform).removeClass('hiddenbox')
});
});
});
});
</script>
The CSS on 'hiddenbox' is nothing more than "display: none.'
There is a with the id of unmarried, which when clicked fades out a div and replaces it with a hidden div that removes the class to reveal it. However, the last part doesn't fire -- everything else does and functions properly. When I look at in the console too, it shows no errors.
Can someone please tell me where the error is? Thanks!
Edit: I may be using the wrong function to replace the div with, so here's the site: http://drjohncurtis.com/happily-un-married. If you click the "download the book" button, the the div disappears and is replaced correctly with the div#block-webform-client-block-18. However, it remains hidden.

The function you pass to replaceWith has to return the content you want to replace it with. You have to actually return the content.
I don't know exactly what you're trying to accomplish, but you could use this if the goal is to replace it with the webform object:
$(this).replaceWith(function () {
return($(webform).removeClass('hiddenbox'));
});

NB, use jquery !
var webform = $('#block-webform-client-block-18');
var unmarriedbutton = $('#unmarried');
var buyingblock =$('#block-block-10');
unmarriedbutton.click(function () {
buyingblock.fadeOut('slow', function() {
$(this).replaceWith( webform.removeClass('hiddenbox'));
});
});
Was too fast, i believe it's the way you select your object (getelementbyid) then you create a jquery object from it... -> use jquery API

anchor jumping by using javascript

I have a question that will be found very often. The problem is that nowhere can be found an explicit solution.
I have two problems regarding anchors.
The main goal should be to get a nice clean url without any hashes in it while using anchors to jump on a page.
So the structure of the anchors is:
<ul>
<li>One</li>
<li>Two</li>
<li>Three</li>
</ul>
<div class="wrap">
<a name="one">text 1</a>
<a name="two">text 2</a>
<a name="three" class="box">text 3</a>
</div>
Okay, if you will click one of the links the url will automatically change to
www.domain.com/page#1
At the end this should be just:
www.domain.com/page
So far, so good. Now the second thing is, when you search the internet for that problem you will find javascript as a solution.
I have found this function:
function jumpto(anchor){
window.location.href = "#"+anchor;
}
and calling that function with:
<a onclick="jumpto('one');">One</a>
what will be the same like before. It will add the hash to the url. I also added
<a onclick="jumpto('one'); return false;">
without success. So if there is someone who could tell me how to solve this I really would appreciate.
Thanks a lot.

You can get the coordinate of the target element and set the scroll position to it. But this is so complicated.
Here is a lazier way to do that:
function jump(h){
var url = location.href; //Save down the URL without hash.
location.href = "#"+h; //Go to the target element.
history.replaceState(null,null,url); //Don't like hashes. Changing it back.
}
This uses replaceState to manipulate the url. If you also want support for IE, then you will have to do it the complicated way:
function jump(h){
var top = document.getElementById(h).offsetTop; //Getting Y of target element
window.scrollTo(0, top); //Go there directly or some transition
}​
Demo: http://jsfiddle.net/DerekL/rEpPA/
Another one w/ transition: http://jsfiddle.net/DerekL/x3edvp4t/
You can also use .scrollIntoView:
document.getElementById(h).scrollIntoView(); //Even IE6 supports this
(Well I lied. It's not complicated at all.)

I think it is much more simple solution:
window.location = (""+window.location).replace(/#[A-Za-z0-9_]*$/,'')+"#myAnchor"
This method does not reload the website, and sets the focus on the anchors which are needed for screen reader.

I don't have enough rep for a comment.
The getElementById() based method in the selected answer won't work if the anchor has name but not id set (which is not recommended, but does happen in the wild).
Something to bear in mind if you don't have control of the document markup (e.g. webextension).
The location based method in the selected answer can also be simplified with location.replace:
function jump(hash) { location.replace("#" + hash) }

Because when you do
window.location.href = "#"+anchor;
You load a new page, you can do:
One
<script>
function getPosition(element){
var e = document.getElementById(element);
var left = 0;
var top = 0;
do{
left += e.offsetLeft;
top += e.offsetTop;
}while(e = e.offsetParent);
return [left, top];
}
function jumpTo(id){
window.scrollTo(getPosition(id));
}
</script>

I have a button for a prompt that on click it opens the display dialogue and then I can write what I want to search and it goes to that location on the page. It uses javascript to answer the header.
On the .html file I have:
<button onclick="myFunction()">Load Prompt</button>
<span id="test100"><h4>Hello</h4></span>
On the .js file I have
function myFunction() {
var input = prompt("list or new or quit");
while(input !== "quit") {
if(input ==="test100") {
window.location.hash = 'test100';
return;
// else if(input.indexOf("test100") >= 0) {
// window.location.hash = 'test100';
// return;
// }
}
}
}
When I write test100 into the prompt, then it will go to where I have placed span id="test100" in the html file.
I use Google Chrome.
Note: This idea comes from linking on the same page using
Test link
which on click will send to the anchor. For it to work multiple times, from experience need to reload the page.
Credit to the people at stackoverflow (and possibly stackexchange, too) can't remember how I gathered all the bits and pieces. ☺

The first suggested solution of accepted solution did not work for me entirely. The main problem was when it was already jumped to hash, and hash already in url, jump did not happen again. I propose here, for the sake of completeness, somewhat more elaborate solution which works (tested in Chrome and FF). el is element with anchor tag.
el.addEventListener('click', function(ev) {
ev.preventDefault();
const href = ev.target.getAttribute('href');
const hashIndex = href.indexOf('#');
if (hashIndex !== -1) {
const hashPart = href.substring(hashIndex);
if (location.hash === hashPart) {
document.querySelector(hashPart).scrollIntoView();
}
else {
location.hash = hashPart;
}
}
})

Javascript make a function only work once

I'm working on a blog theme where you can like posts from the theme page. It uses the following javascript to like the post with the tumblr API, change the white heart to a red heart, and also +1 to the post note count, displayed above the like buttons. It works fine, but I have the problem that when you click the heart button, it turns red, likes the post, and +1's to the note count, but you can continue to click the button once it's already liked and it keeps adding one to the note count. Can anyone help me to make it so it's a function that only works once, ex: someone clicks the heart button, it turns red, adds one to the note count, and then is done.
$(function() {
$('.likepost').live('click', function() {
var post = $(this).closest('article');
var id = post.attr('id');
var oauth = post.attr('rel').slice(-8);
var count = parseInt($("#note_count_"+ id).text());
var like = 'http://www.tumblr.com/like/'+oauth+'?id='+id;
$('#like-it').attr('src', like);
$(this).css({"background" : "url(http://static.tumblr.com/uiqhh9x/JYdlzwvnx/like2.png)"});
$("#note_count_"+ id).text(count+1);
return false;
});
});
It's functioning on http://blog.jamescharless.com/, by the way. You have to be logged into tumblr for the script to work.

$("body").one("click", ".likepost", function() {
//your code here
});
By using the .one() function you only allow the click to be triggered one time. It's kind of what it was designed for. Ideally you'd want to use a parent of .likepost closer to it than the body, but worst case you could just use body as the parent.

You can unbind the click event.
$(function() {
$('.likepost').live('click', function() {
var post = $(this).closest('article');
var id = post.attr('id');
var oauth = post.attr('rel').slice(-8);
var count = parseInt($("#note_count_"+ id).text());
var like = 'http://www.tumblr.com/like/'+oauth+'?id='+id;
$('#like-it').attr('src', like);
$(this).css({"background" : "url(http://static.tumblr.com/uiqhh9x/JYdlzwvnx/like2.png)"});
$("#note_count_"+ id).text(count+1);
// unbind
$(this).unbind('click');
return false;
});
});