Using Hashes in URL to Run Script onload - javascript

I was wanting to make a link similar to this
www.mysite.com/profile/#openTheme
When the link has the hash "#openTheme" i want it to run a function on the page when the page is loaded.
Is there a way to set an Anchor like this eg:
<a name="openTheme" onActivate="runScript()">
Or is there a better way of doing it? Eg, running a script onload to find any location hashes and using if/else?
Thanks.

You can pick this up using this:
self.document.location.hash
This will return #openTheme in this case. You can then do an if, so...
if(self.document.location.hash == '#openTheme')
{
//do something
}

You can register the window.onhashchange event, which will fire whenever the user types a new hash into the address bar, or a link is clicked that points to a hash on the current page, or JavaScript sets location.href to "#something-or-other".

Related

HTML link - href if javascript is disabled, onclick if js is enabled

To send users to different links, I use a JS function that when called, creates an animation, times out for a bit and then location.href the user, the problem is that if a user does not have JS enabled, he will not be redirected to the site. Is there any way onclick wold redirect the user normally if he does not have JS enabled and redirect it with my function if JS is enabled?
Thanks is advance!
You could try creating the element with both href and onclick attributes. Then, in your JS, set the href attribute to "javascript:void(0)".
Code would look something like this:
html
<a id="jsElement" href="/newPage.html" onclick="callFunction()">Text</a>
javascript
window.onload = function() {
document.getElementById("jsElement").setAttribute("href", "javascript:void(0)");
}

Link with hash : how to always navigate

On the footer of the website I'm working on, I have links to different pages, and in one case, 2 links to the same page with a different hash in the url ,like this :
<a href="http://example.com/mypage#test>Test</a>
<a href="http://example.com/mypage#test2>Test2</a>
These hashes are not true anchors, they reflect some actions the user takes (namely showing/hiding some content).
If I come from another page, I navigate without any problem. However, if I am already on "mypage", then the hash changes, but nothing happens. The browser detects and anchor change and thus tries to navigate to the anchor.
That's fair enough, but I want my user to be actually redirected to "http://example.com/mypage#test2", as if he copy-pasted it himself in the address bar. How can I achieve that ?
I could use the hashchange event but it would make it complicated to manage the rest of the javascript, so I wonder if there is a simpler way to do it.
You have a very simple solution if you are using jQuery:
$(window).on('hashchange', function() {
//code
});
Check out this: On - window.location.hash - Change?
Also this MDN documentation.
Use the location.hash property of the window object to find out what the anchor is. To detect a change in the hash, with plain javascript, just use the onhashchange event.
window.onhashchange = new function() {
window.location.replace("http://example.com/mypage" + window.location.hash);
});

Reload page when changing hash

Reload page when changing hash.
I have a simple one-page site with several 'pages' on it. These pages are in one wide container which scrolls when you choose one. I have added a hash to the URL so that you can locate to specific pages directly. This just sets the style.left attribute when it matches a hash in a switch statement.
The problem is that when I change the hash value in the URL. For example, changing it from Home.html#Web to Home.html#Photos. When doing this, the page doesn't reload so the Setup function I've created that check for the hash isn't called and the page just remains where it is.
Any ideas for a way to force the page to reload? Or a better solution?
Thanks,
Andy
Don't reload the page. Instead, set up a onhashchange event handler, and adjust the left value from there:
window.onhashchange = function() {
// do stuff
}
Otherwise, why using hash links instead of regular links? In any case, if you really want to reload, just put window.location.reload() inside the onhashchange handler...
I had a JQuery function that fired on $('body').on('click', '.subcategory-link', function () { }); which detected if there was a hash appended to the URL in my case, so I kept that function the same and then just used a force reload whenever a hash change was detected:
below i write the code pls try this one it wrok from me charm.
$(document).ready(function() {
$('body').on('click', '.subcategory-link', function () { var data = $(this).attr('href');
alert($(this).attr('href'));
window.location.reload();
});
});

perform href before onClick

I've the following link:
I
And this use the following javascript:
function showGallery(){
if(window.location.hash) {
$('#gallery').fadeIn('fast');
var hash = window.location.hash.substring(1);
alert(hash);
} else {
}
}
So it only show the gallery when in the URL is a hashtag. But when i click on the link, nothing happens. When i click it twice, the gallery fade in.
So the link first make the javascript, and i doesn't work 'cause there is no hashtag in the URL and after that, it perform the href and insert the Hashtag in the URL.
How can i do that?
My Target:
When i click on a link, it open a gallery. To know which gallery i must open, i insert in the URL a Hashtag. Here i want to display the HDR album. And i also want, if my site get opend with a hashtag, it should display the gallery.!
Is there also a another, easier or cleaner way to make it?
Hope you understand what i want.
For modern browsers, you can bind your Javascript code to the onhashchange event. Links will be without Javascript:
I
And the Javascript is run whenever the hash has changed:
function locationHashChanged() {
if (location.hash === "#HDR") {
$('#gallery').fadeIn('fast');
}
}
window.onhashchange = locationHashChanged;
Have you tried a setTimeout call to delay the onclick event?
Like this:
I
You can simplify this quite considerably, it is not good practice to use the href for other things than pure navigation.
<a onClick="showGallery('HDR')">I</a>
And then:
function showGallery(name){
if(name) {
$('#gallery').fadeIn('fast');
alert(name);
} else {
}
}
If you want to run showGallery() without following the link, the correct code is this:
I
By keeping the href the user still sees the destination in the status bar and navigation still works for clients without Javascript (i.e. Google). By returning false in the event handler, you prevent the browser from following the link.
In showGallery(), you can then show the gallery and add '#HDR' to the location.hash.
You don't need to verify the window's hash, because on first click you don't have any hash in the address bar. The functionality will only apply on the second click.
What you can do is this:
gallery 1
function showGallery(galid){
var linkhash = $('#' + galid).attr('href').substring(1);
alert(linkhash);
$('#gallery' + linkhash).fadeIn('fast');
}

Force page reload with html anchors (#) - HTML & JS

Say I'm on a page called /example#myanchor1 where myanchor is an anchor in the page.
I'd like to link to /example#myanchor2, but force the page to reload while doing so.
The reason is that I run js to detect the anchor from the url at the page load.
The problem (normally expected behavior) here though, is that the browser just sends me to that specific anchor on the page without reloading the page.
How would I go about doing so? JS is OK.
I would suggest monitoring the anchor in the URL to avoid a reload, that's pretty much the point of using anchors for control-flow. But still here goes. I'd say the easiest way to force a reload using a simple anchor-link would be to use
where in place of $random insert a random number (assuming "dummy" is not interpreted server side). I'm sure there's a way to reload the page after setting the anchor, but it's probably more difficult then simply reacting to the anchor being set and do the stuff you need at that point.
Then again, if you reload the page this way, you can just put myanchor2 as a query parameter instead, and render your stuff server side.
Edit
Note that the link above will reload in all circumstances, if you only need to reload if you're not already on the page, you need to have the dummy variable be more predictable, like so
I would still recommend just monitoring the hash though.
Simple like that
#hardcore
an example
Another way to do that is to set the url, and use window.location.reload() to force the reload.
<a href="/example#myanchor2"
onclick="setTimeout(location.reload.bind(location), 1)">
</a>
Basically, the setTimeout delays the reload. As there is no return false in the onclick, the href is performed. The url is then changed by the href and only after that is the page reloaded.
No need for jQuery, and it is trivial.
My favorite solution, inspired by another answer is:
myanchor2
href link will not be followed so you can use your own preference, for example: "" or "#".
Even though I like the accepted answer I find this more elegant as it doesn't introduce a foreign parameter. And both #Qwerty's and #Stilltorik's answers were causing the hash to disappear after reload for me.
What's the point of using client-side JS if you're going to keep reloading the page all the time anyways? It might be a better idea to monitor the hash for changes even when the page is not reloading.
This page has a hash monitor library and a jQuery plugin to go with it.
If you really want to reload the page, why not use a query string (?foo) instead of a hash?
Another option that hasn't been mentioned yet is to bind event listeners (using jQuery for example) to the links that you care about (might be all of them, might not be) and get the listener to call whatever function you use.
Edit after comment
For example, you might have this code in your HTML:
example1
example2
example3
Then, you could add the following code to bind and respond to the links:
<script type="text/javascript">
$('a.myHash').click(function(e) {
e.preventDefault(); // Prevent the browser from handling the link normally, this stops the page from jumping around. Remove this line if you do want it to jump to the anchor as normal.
var linkHref = $(this).attr('href'); // Grab the URL from the link
if (linkHref.indexOf("#") != -1) { // Check that there's a # character
var hash = linkHref.substr(linkHref.indexOf("#") + 1); // Assign the hash to a variable (it will contain "myanchor1" etc
myFunctionThatDoesStuffWithTheHash(hash); // Call whatever javascript you use when the page loads and pass the hash to it
alert(hash); // Just for fun.
}
});
</script>
Note that I'm using the jQuery class selector to select the links I want to 'monitor', but you can use whatever selector you want.
Depending on how your existing code works, you may need to either modify how/what you pass to it (perhaps you will need to build a full URL including the new hash and pass that across - eg. http://www.example.com/example#myanchor1), or modify the existing code to accept what you pass to it from you new code.
Here's something like what I did (where "anc" isn't used for anything else):
And onload:
window.onload = function() {
var hash = document.location.hash.substring(1);
if (hash.length == 0) {
var anc = getURLParameter("anc");
if (anc != null) {
hash = document.location.hash = anc;
}
}
}
The getURLParameter function is from here
If you need to reload the page using the same anchor and expect the browser to return to that anchor, it won't. It will return to the user's previous scroll position.
Setting a random anchor, overwriting it and then reloading seems to fix it. Not entirely sure why.
var hash = window.location.hash;
window.location.hash = Math.random();
window.location.hash = hash;
window.location.reload();
Try this its help for me
<a onclick="location.href='link.html'">click me</a>
In your anchor tag instead of
click me
As suggested in another answer, monitoring the hash is also an option. I ended up solving it like this so it required minimal code changes. If I had asked the original question, I believe I would have loved to see this option fully explained.
The added benefit is that it allows for additional code for either of the situations (hash changed or page loaded). It also allows you to call the hash change code manually with a custom hash. I used jQuery because it makes the hash change detection a piece of cake.
Here goes!
Move all the code that fires when a hash is detected into a separate independent function:
function openHash(hash) {
// hashy code goes here
return false; // optional: prevents triggering href for onclick calls
}
Then detect your hash for both scenarios like so:
// page load
$(function () {
if(typeof location.hash != typeof undefined) {
// here you can add additional code to trigger only on page load
openHash(location.hash);
}
});
// hash change
$(window).on('hashchange', function() {
// here you can add additional code to trigger only on hash change
openHash(location.hash);
});
And you can also call the code manually now like
Magic
Hope this helps anyone!
Try this by adding simple question mark:
Going to Anchor2 with Refresh

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