Unable to go to history back at the very first load - javascript

I am using a button to go back page from where I came from. Now after loading the page i will go through few navigation and there I will meet this back button, for this i am using the following
(window.history.go(-1)
//window.history.back())
in the script. This not work for the very first time only after refresh it will work perfectly. Help please.

I think you also need to do return false; if you added that in HTML onclick. Or in the click handler function add e.preventDefault(). Make sure you specify e (event) as the argument for the click handler function:
function clickhandler(e) {
e.preventDefault();
// ...
};

Related

How to trigger my javascript pop up form with WordPress navigation link?

I've created a javascript pop up contact form, how do I trigger this after clicking a WordPress navigation item?
I have already tried the following code which works fine. However, after 1 second it loads the page which I've set the nav item to in WordPress.
document.getElementById('menu-item-177').addEventListener("click", function() {
document.querySelector('.bg-modal').style.display = "flex";
$('body').css('overflow','hidden')
});
I tried deleting the page, but obviously the nav link disappears. I also tried removing the menu item in the Menu settings of WordPress, same outcome.
I somehow need to block the page loading when the nav link is clicked. Is there a way round this?
Make sure that you are selecting the <a href=".. anchor element and listen for the click on that. I see that you have jQuery loaded in, so it might be good to just use that, or don't use it at all.
In your click event listener you listen for a click to happen. Whenever this click happens the function in the listener will be called. This function exposes some information about the event in the Event object. You'll see this in other pieces of code named e, evt, event or something else to refer to this Event object.
The Event object has a method called Event.preventDefault() which stops the browser from executing any kind of behavior that is linked to that element. Like navigating with an <a> tag. See why it is important to know what element you are clicking on? By adding that you can add your own behavior. See the example below.
$('#menu-item-177 > a').on('click', function(event) {
event.preventDefault(); // Prevents default navigation behavior.
$('.bg-modal').css('display', 'flex');
$('body').css('overflow', 'hidden');
});

jQuery Function Stuck in Loop

I have a simple div with a link with in:
<div class="mhButton">
<span class="icon-checkmark"></span> Register Animal
</div>
I've have a function that is triggered whenever the 'div.mhButton' is clicked. This function should find 'div.mhButton' child 'a' and click it.
$(".mhButton").on('click', function () {
var a = $(this).find("a").text();
console.log(a);
$(this).find("a").click();
});
This works, however, I get stuck in a loop that runs like 639 times.
I can't comprehend why this runs X amount of times, then continues without error.
Does anyone have a solution on how to prevent this? Along with an explanation on why this happens?
Note* The console is logging the same button, again and again.
Because the a tag is embedded in the button, you are continuously re-firing the event. Events will bubble up, so the anchor will get clicked, and then its parent. It is running until the browser gets tired of running it and then it just stops. The method doesn't actually do anything which is likely why you aren't seeing any issues. You can accomplish your goal a couple of ways:
$(".mhButton").click(function () {
$(this).off('click'); // turn the click handler off in the handler itself.
var a = $(this).find("a").text();
console.log(a);
$(this).find("a").click();
});
If you do this, then you will end up only being able to fire the event once.
Alternatively:
$(".mhButton").click(function (e) {
a = $(this).find("a").text();
console.log(a);
$(this).find("a").click();
});
$("#RegisterAnimal").click(function (e) {
e.stopPropagation(); // prevent the anchor from re-firing the button click
});
Altenatively, you can just style the link to look like a button and avoid the unnecessary click handlers all together.
When you call $(this).find("a").click(); the event will bubble up to the div.mhButton tag and cause your handler to be called again. The reason it runs around 500 times is because it stops with a stack overflow, it does not continue
You can prevent it by checking if the click was the <a> tag itself and not calling click() in that case
Working example: http://jsfiddle.net/mendesjuan/zdkrhh42/
Note Regarding the accepted answer
Bic's second answer almost works, mine is a different approach with fewer side effects. The main problem with calling stopPropagation is that there may be handlers on the whole document that wouldn't get fired in that case. A commmon case is when you have a menu or a dialog that is supposed to hide when you click anywhere else on the page. The stopPropagation approach will prevent the menu from being hidden when they click your button.
$(".mhButton").click(function (e) {
// Only run this handler if the click was on the div, not the link itself
if ( $(e.target).is('a, a *') ) {
return;
}
var a = $(this).find("a").text();
$(this).find("a").click();
});

Correct way to unset submit button text now that Jquery's .unload is deprecated

SETUP - Large search with many criteria as a POST via a html submit button, it can take several seconds before the first byte is sent by the server / results page starts loading.
http://api.jquery.com/unload/ is now deprecated (as of version 1.8), and I'm searching for the CORRECT way to do the following...
When someone clicks the search button, I give the user a little feedback by setting the button text to "Searching...", then allow the submit to continue (return true):
$('#dosearch').click(function() {
$(this).html('<i class="icon-spinner icon-spin"></i> Searching...');
return true;
});
During unload I'm currently doing this:
$(window).unload(function() {
$('#dosearch').html('<i class="icon-search"></i> Search');
});
I tried binding to beforeunload, but that fires as soon as the submit happens (bad), not as soon as the browser begins rendering the new page (good).
The problem is if they click search and then click the BACK button on their browser. If they do that, then the Searching... text is still shown.
What is the correct / proper way to do what I'm attempting here?
NOTE: (The reason for the I tag is that I'm using font awesome).
Binding an empty event handler to unload seems to work, but it's kind of a hack.
$('#dosearch').click(function() {
$(this).html('<i class="icon-spinner icon-spin"></i> Searching...');
return true;
});
$(window).on("load", function(){
$('#dosearch').html('<i class="icon-search"></i> Search');
});
$(window).on("unload", function(){
// Leave this blank handler here or onload won't fire on IE or FF when you click back button
});
See this question for explanation.
If the user goes back in history, it means it renders the page new or not? So you could, whenever the page is loaded, reset the value to what you want to.
Could that be something?

JQuery events cause page reload. How to fix?

I'm observing a behavior where onClick events cause a page to reload.
$('#target').click(function(){
$('#target').hide();
})
So the object is shown, it hides on click, but then page reloads and the object is shown again. I'm working on a website that was setup before me, so I'm not entirely aware of all its parts. Any idea what might cause this behavior and how to fix it?
You need to prevent the default event behavior with event.preventDefault:
$("#target").on("click", function (e) {
$(this).hide();
e.preventDefault();
});
Using return false will also work, but it does more than you may intend.
This is in line with the event cancellation standard
add a
return false;
as last statement so that the link is not called, only you function (onclick) is executed.

Link to anchor (ajax url) doesn't call onBeforeUnload

I have an onbeforeunload event :
$().ready(function() {
window.onbeforeunload=function() { return "haha" };
});
And my links are like this (ajax web site) :
<a href="#pageX" />
But the onbeforeunload is never called. What can i do ?
Thanks
I'm guessing since you're trying to bind to the onbeforeunload and return a string, that you're looking to provide the user with an "Are you sure you want to leave this page" dialog on an AJAX site.
In which case you probably need to go about this a little differently by binding a click handler onto the links. So you can prevent the hash change until the confirmation is made.
Something like:
$('a[href^="#"]').live('click',function(e){
if( //should we be confirming first? ) {
//put your confirmation code here either using default JS windows or your own CSS/jQueryUI dialog boxes
// this code should either cache the url of the link that was clicked and manually update the location with it when the user confirms the dialog box (if you're using JQUI windows) or simply use JS confirmation boxes and based on the response, all you need to do is return; and the link click will handle normally
e.preventDefault(); //prevent the link from changing the hash tag just yet
e.stopImmediatePropagation(); //prevent any parent elements from firing any events for this click
}
} );
Don't get me wrong, but are you serious ?
That link just refers a hash-tag, hence, it will not leave the current site and there will be no call to onbeforeunload nor unload.
If there is any *click event handlerbound to that anchor aswell, there must be something in the event handler code which really forces the current site to get unloaded (location.href` for instance).
If you just switch HTML via Ajax, there is no onbeforeunload aswell.
You could bind a handler to the onhashchange event (check browser compatibilty) but that would fire for any change that happens in your url/hash.
You're probably looking for the onhashchange event:
https://developer.mozilla.org/en/DOM/window.onhashchange

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