I was testing out an approach to a solution and found that the methods or functions available for a programmatically triggered JavaScript event is different from ones that are available when the user clicks on the element. For instance, I wasn't able to get the mouse positions of the click event. If the user had clicked, I would have been able to get the mouse positions and a lot more. I am adding the events and triggering it via jQuery. Any reason for this? Any one know how I can get the mouse position after programmatically triggering it using jQuery?
you can use the offset jquery function:
var clickedPostion = $(this).offset();
alert(e.clientX - clickedPostion.left);
alert(e.clientY - clickedPostion.top);
I know the sample it is on click, but you can change it to mousemove()
Here is a working sample:
http://jsfiddle.net/6wccZ/
Related
I want to display an image under the mouse (a finger to simulate a touch screen) when a mousedown event occurs and hide it when the mouseup event occurs, but when I do this, the image I display blocks the subsequent mouse events ("click" in particular) on elements under this image. I'm using jQuery, by the way.
I'm sure this is something to do with event bubbling or propagating or somewhat, but I couldn't figure it out. Any pointers please?
Check out this answer to on this post:
https://stackoverflow.com/a/4839672/589909
It seems to do what I understand what you want to achieve using a pure cross browser CSS approach.
pointer-events:none;
touch-action:none;
Billy Moon, your code was almost working. You just have to use hide and show instead of css :
$('#finger').click(function(e){
evt = e || window.event;
// make finger disappear
$('#finger').hide(0);
// get element at point of click
starter = document.elementFromPoint(evt.clientX, evt.clientY);
// send click to element at finger point
$(starter).click();
// bring back the finger
$('#finger').show(0);
});
This is untested - but is based on a working script of mine, so should be along the right lines. Basically, you have to make the layer that is in the way disappear for a moment, so you can use the elementFromPoint method and then make it come back.
$('.selector').click(function(e){
evt = e || window.event;
// make finger disappear
$('.finger').css({display:'none'});
// get element at point of click
starter = document.elementFromPoint(evt.clientX, evt.clientY);
// send click to element at finger point
$(starter).click();
// bring back the finger
$('.finger').css({display:''});
});
You can do this
$(document).bind('mousedown mouseup', function() {
$('.finger').toggle();
});
Check working example at http://jsfiddle.net/2cSj4/2/
I have a bit of javascript that will allow the user to move stuff around using the mouse, so the user can click and drag things around, which is working all fine, but what I am struggling with is being able to override the users click event.
So what I am trying to do is, if the user moves the item to a certain position I want to stop the click and hold event, this would mean the user would have to the go an reselect the item again and click and drag again.
Can you override the users mouse action from javascript? It seems simple but I am unable to find a way in my javascript to stop the mousehold event
You can try to override onmousedown to store the mouse coordinates and fire the "real click" event on onmouseup if the mouse position did not changed (or if the change is less than say 5 pixels).
document.getElementById('myElement').addEventListener('click', function(e) {
e.preventDefault(); // here is your override
doSomethingElse(); // or not
});
Same thing for IE but use attachEvent instead of addEventListener
Perhaps instead of blocking events, you can put some logic inside your onclick handler to check for this condition?
For example, maybe a couple of properties to maintain state. You could call one itemSelected, which must be true in order for the the item to move. Then if you set itemSelected to false, another click will be necessary to toggle it again.
I have an image that I want to have trigger certain behaviors when the mouse is over, I have a mouseover and mouseout method, but if you happen to have your mouse over the image when the page loads, the mouseover method never fires until you leave the image and come back over it.
Is there a way to detect if the mouse is over an element on the fly without the mouse having to be off of the element and then come over the element to trigger the JS mouseover event? Like is there a document.getElementById("blah").mouseIsOver() type function in Javascript?
I believe this is possible without any action from the user. When your page loads, bind the mouseover event to your image and hide your image (i.e. using CSS display:none). Use setTimeout() to show it again in a few milliseconds (10 should be enough). The even should be fired.
If you don't want to cause the 'flick' effect on your image, you may try using some temporary element instead, attaching event to it, and delegating the event onto your image.
I have no idea if this is cross-browser solution, but it worked from my Firefox 3.0 console ;)
You could use the mousemove event. That would trigger anytime the user moves a mouse; so the only instance of the trigger not firing would be if the user does not move the mouse at all, which should be rare.
The only problem with this is that the event would fire anytime the mouse would move over your image, so you would get a LOT of those events while over the component. What you would probably need to do is implement some sort of flag within your method when the event fires. You turn on the flag when the event first fires, and you turn it off when you leave the component.
This is less than ideal, but I think this will probably satisfy your problem scenario. The following is some quick pseudo code on what that solution might look like, I think it should work.
<img src="blah.png" onmousemove="JavaScript:triggerOn(event)" onmouseout="JavaScript:triggerOff(event)"/>
...
<script type='text/javascript'>
var TriggerActive = false;
function triggerOn(e){
e = e||window.e;
if( !TriggerActive){
TriggerActive = true;
// Do something
} else {
// Trigger already fired, ignore this event.
}
}
function triggerOff(e){
e = e||window.e;
if(TriggerActive)
TriggerActive = false;
}
</script>
You can find some great mouse event information including browser compatibility notes here.
Use document.querySelectpor and onload/onready events.
var a = document.querySelector('#a:hover');
if (a) {
// Mouse cursor is above a
}
else {
// Mouse cursor is outside a
}
There is no way to get the mouse coordinates aside from listening for mouse events, namely mousemove, mouseover etc. However, these events are very sensitive in the sense that moving the cursor by just one pixel is enough to trigger them, so having the cursor hover over your image while perfectly still should be somewhat unusual.
I was looking on this post but it doesn't really help me. What I'm trying to do is to create event, or what would be even better, access current mouse screen coordinates.
I have a function with setTimeout inside it, where number of different checks on attributes are performed. In my program some of the elements are changing position and what I want to do is check whether mouse is still over some elements or not.
Many thanks,
Artur
You just want to bind to the onmouseover and onmouseout events of an object. I found this to be unreliable however as some users can't keep a cursor over a small target so I found a great plug-in for jQuery called hoverIntent that works beautifully.
This solves the problem:
// Mouse coordinates for event.clientX, event.clientY respectively.
var myClientX, myClientY;
// This call makes sure that global variables myClientX, myClientY are up to date
window.document.addEventListener("mousemove", function(event) {
myClientX = event.clientX;
myClientY = event.clientY;
}, false);
Making coordinates global let's me access them whenever I want :)
I would like to know if there is a jQuery event that I can use to determine when a particular DIV's top property has changed.
For instance, I have invisible content above a DIV. When that content becomes visible, the DIV is shifted down. I would like to capture that event and then use the offset() function to get the X/Y coordinates.
The easy answer is that there are no events in the DOM for detecting layout updates.
You have a couple options the way I see it:
Poll, nasty but it may work depending on your update frequency requirements.
Tap into whatever event causes the invisible DIV to change size and do whatever you need to do in that handler
I shall correct myself.
I took a look at the DOM and noticed the DOMAttrModified event and found this JQuery Plug-In that you might be able to leverage to do what you want.
As the article mentions, it works great in IE and Firefox but seems to have problems in WebKit.
I thiiink you should be able to do:
$(document).ready( function (){
$("#mydiv").bind("movestart", function (){ ...remember start position... });
$("#mydiv").bind("moveend", function (){ ...calculate offsets etc... });
});
$("#someId").resize(function () {
// your code
});