Check if elemntFromPoint() bumps into a hyperlink - javascript

I am using elemntFromPoint in order to return onclick some element. I would like to check if the returned element ('span' div' whatever...) is part of a link or if it is a button etc. How should I start? Thanks.

To check if the element "is part of a link" you'll want to traverse up the DOM tree until you hit an anchor - if you don't hit an anchor then the element isn't in a link. E.g.
var el = document.elementFromPoint(x,y),
cur = el,
isInAnchor = false;
do {
if (cur.nodeName.toLowerCase() === 'a') {
isInAnchor = true;
break;
}
} while (cur = cur.parentNode);
alert(isInAnchor); // either true or false

Related

How to get href of anchor when the event.target is HTMLImageElement?

I want to get the href of an anchor element when it is clicked.
I am using the following javascript code:
document.addEventListener('click', function (event)
{
event = event || window.event;
var el = event.target || event.srcElement;
if (el instanceof HTMLAnchorElement)
{
console.log(el.getAttribute('href'));
}
}, true);
This works perfectly for an embedded anchor such as this:
<div><p><a href='link'></a></p><div>
But it doesn't work when I am working with an anchor and an image:
<div><a href='link'><img></a></div>
The event.target is returning the image instead of the anchor.
The javascript code can be amended with the following if case to get around this:
document.addEventListener('click', function (event)
{
event = event || window.event;
var el = event.target || event.srcElement;
if (el instanceof HTMLImageElement)
{
// Using parentNode to get the image element parent - the anchor element.
console.log(el.parentNode.getAttribute('href'));
}
else if (el instanceof HTMLAnchorElement)
{
console.log(el.getAttribute('href'));
}
}, true);
But this doesn't seem very elegant and I'm wondering if there is a better way.
!IMPORTANT!
NOTE: Keep in mind, I have no access to an ID or class, or any other traditional identifier for that matter. All I know is that there will be an anchor clicked and I need to get its href. I don't even know where it will be, if it exists or will be created later.
EDIT: Please no jQuery or other javascript libraries.
Instead of looping all anchors in the DOM, lookup from the event.target element.
Using JavaScript's .closest() MDN Docs
addEventListener('click', function (event) {
event.preventDefault(); // Don't navigate!
const anchor = event.target.closest("a"); // Find closest Anchor (or self)
if (!anchor) return; // Not found. Exit here.
console.log( anchor.getAttribute('href')); // Log to test
});
<a href="http://stackoverflow.com/a/29223576/383904">
<span>
<img src="//placehold.it/200x60?text=Click+me">
</span>
</a>
<a href="http://stackoverflow.com/a/29223576/383904">
Or click me
</a>
it basically works like jQuery's .closest() which does
Closest or Self (Find closest parent... else - target me!)
better depicted in the example above.
Rather than adding a global click handler, why not just target only anchor tags?
var anchors = document.getElementsByTagName("a");
for (var i = 0, length = anchors.length; i < length; i++) {
var anchor = anchors[i];
anchor.addEventListener('click', function() {
// `this` refers to the anchor tag that's been clicked
console.log(this.getAttribute('href'));
}, true);
};
If you want to stick with the document-wide click handler then you could crawl upwards to determine if the thing clicked is-or-is-contained-within a link like so:
document.addEventListener('click', function(event) {
event = event || window.event;
var target = event.target || event.srcElement;
while (target) {
if (target instanceof HTMLAnchorElement) {
console.log(target.getAttribute('href'));
break;
}
target = target.parentNode;
}
}, true);
This way at least you'd avoid writing brittle code that has to account for all of the possible types of anchor-children and nested structure.

Close all Angular JS Bootstrap popovers with click anywhere on screen?

I am using the Angular directives for bootstrap.
I have a popover as in their example:
<button popover="Hello, World!" popover-title="Title" class="btn btn-default ng-scope">Dynamic Popover</button>
It closes when you click on the button again. I'd like to close it -- and any other open popovers -- when the user clicks anywhere.
I don't see a built-in way to do this.
angular.element(document.body).bind('click', function (e) {
var popups = document.querySelectorAll('.popover');
if(popups) {
for(var i=0; i<popups.length; i++) {
var popup = popups[i];
var popupElement = angular.element(popup);
if(popupElement[0].previousSibling!=e.target){
popupElement.scope().$parent.isOpen=false;
popupElement.remove();
}
}
}
});
This feature request is being tracked (https://github.com/angular-ui/bootstrap/issues/618). Similar to aet's answer, you can do what is recommended in the feature request as a work-around:
$('body').on('click', function (e) {
$('*[popover]').each(function () {
//Only do this for all popovers other than the current one that cause this event
if (!($(this).is(e.target) || $(this).has(e.target).length > 0)
&& $(this).siblings('.popover').length !== 0
&& $(this).siblings('.popover').has(e.target).length === 0)
{
//Remove the popover element from the DOM
$(this).siblings('.popover').remove();
//Set the state of the popover in the scope to reflect this
angular.element(this).scope().tt_isOpen = false;
}
});
});
(source: vchatterji's comment in feature request mentioned above)
The feature request also has a non-jQuery solution as well as this plnkr: http://plnkr.co/edit/fhsy4V
angular.element(document.body).bind('click', function (e) {
var popups = document.querySelectorAll('.popover');
if (popups) {
for (var i = 0; i < popups.length; i++) {
var popup = popups[i];
var popupElement = angular.element(popup);
console.log(2);
if (popupElement[0].previousSibling != e.target) {
popupElement.scope().$parent.isOpen = false;
popupElement.scope().$parent.$apply();
}
}
}
});
What you say it's a default settings of the popover, but you can control it with the triggers function, by putting blur in the second argument of the trigger like this popover-trigger="{mouseenter:blur}"
One idea is you can change the trigger to use mouse enter and exit, which would ensure that only one popover shows at once. The following is an example of that:
<button popover="I appeared on mouse enter!"
popover-trigger="mouseenter" class="btn btn-default"
popover-placement="bottom" >Hello World</button>
You can see this working in this plunker. You can find the entire list of tooltip triggers on the angular bootstrap site (tooltips and popovers have the same trigger options). Best of luck!
Had the same requirement, and this is how we did it:
First, we modified bootstrap, in the link function of the tooltip:
if (prefix === "popover") {
element.addClass('popover-link');
}
Then, we run a click handler on the body like so:
$('body').on('click', function(e) {
var clickedOutside = true;
// popover-link comes from our modified ui-bootstrap-tpls
$('.popover-link').each(function() {
if ($(this).is(e.target) || $(this).has(e.target).length) {
clickedOutside = false;
return false;
}
});
if ($('.popover').has(e.target).length) {
clickedOutside = false;
}
if (clickedOutside) {
$('.popover').prev().click();
}
});
I am using below code for same
angular.element(document.body).popover({
selector: '[rel=popover]',
trigger: "click"
}).on("show.bs.popover", function(e){
angular.element("[rel=popover]").not(e.target).popover("destroy");
angular.element(".popover").remove();
});
Thank you Lauren Campregher, this is worked.
Your code is the only one that also runs the state change on the scope.
Only configured so that if you click on the popover, the latter closes.
I've mixed your code, and now also it works if you click inside the popover.
Whether the system, whether done through popover-template,
To make it recognizable pop up done with popover-template, I used classes popover- body and popover-title, corresponding to the header and the body of the popover made with the template, and making sure it is pointing directly at them place in the code:
angular.element(document.body).bind('click', function (e) {
var popups = document.querySelectorAll('.popover');
if(popups) {
for(var i=0; i<popups.length; i++) {
var popup = popups[i];
var popupElement = angular.element(popup);
var content;
var arrow;
if(popupElement.next()) {
//The following is the content child in the popovers first sibling
// For the classic popover with Angularjs Ui Bootstrap
content = popupElement[0].querySelector('.popover-content');
// For the templating popover (popover-template attrib) with Angularjs Ui Bootstrap
bodytempl = popupElement[0].querySelector('.popover-body');
headertempl= popupElement[0].querySelector('.popover-title');
//The following is the arrow child in the popovers first sibling
// For both cases.
arrow = popupElement[0].querySelector('.arrow');
}
if(popupElement[0].previousSibling!=e.target && e.target != content && e.target != arrow && e.target != bodytempl && e.target != headertempl){
popupElement.scope().$parent.isOpen=false;
popupElement.remove();
}
}
}
});
Have ever a good day, thank you Lauren, thank you AngularJS, Thank You So Much Stack Family!
Updated:
I updated all adding extra control.
The elements within the popover were excluded from the control (for example, a picture inserted into the body of the popover.). Then clicking on the same closed.
I used to solve the command of API Node.contains, integrated in a function that returns true or false.
Now with any element placed inside, run the control, and keeps the popover open if you click inside :
// function for checkparent with Node.contains
function check(parentNode, childNode) { if('contains' in parentNode) { return parentNode.contains(childNode); } else { return parentNode.compareDocumentPosition(childNode) % 16; }}
angular.element(document.body).bind('click', function (e) {
var popups = document.querySelectorAll('.popover');
if(popups) {
for(var i=0; i<popups.length; i++) {
var popup = popups[i];
var popupElement = angular.element(popup);
var content;
var arrow;
if(popupElement.next()) {
//The following is the content child in the popovers first sibling
// For the classic popover with Angularjs Ui Bootstrap
content = popupElement[0].querySelector('.popover-content');
// For the templating popover (popover-template attrib) with Angularjs Ui Bootstrap
bodytempl = popupElement[0].querySelector('.popover-body');
headertempl= popupElement[0].querySelector('.popover-title');
//The following is the arrow child in the popovers first sibling
// For both cases.
arrow = popupElement[0].querySelector('.arrow');
}
var checkel= check(content,e.target);
if(popupElement[0].previousSibling!=e.target && e.target != content && e.target != arrow && e.target != bodytempl && e.target != headertempl&& checkel == false){
popupElement.scope().$parent.isOpen=false;
popupElement.remove();
}
}
}
});

How to detect a user clicked on an internal or external link

I need to know if users clicked on an internal or external link to alert them.
I have many internal and external links on my site.
My internal links are like this:
about
draw graph
I need to alert only when external links are clicked.
(I've included two methods here: One method uses jQuery, and the other doesn't use jQuery. Skip down to the bold heading if you don't want to use jQuery)
One way you could do this is by adding a class to each external link, and then attaching an event handler to everything in that class which raises an alert when you click the link. That's tedious, though, as you have to add the class to every external link, and it won't for user generated content.
What you can do is use jQuery, along with the CSS selector a[href^="http"], to select all the external links, and then attach an event handler that raises your alert when they're clicked:
$('a[href^="http"]').click(function() {
alert();
});
a[href^="http"] means "an a tag which has a link, and that link has to start with 'http'." So here we select all the elements which start with http - that is, every external link - and then set it so that when you click on them, an alert pops up.
Non-jQuery method
If you want to do this without jQuery, you'll want to use document.querySelectorAll('a[href^="http"]') and bind the click event of each element in the array that that function returns. That looks something like this:
var externalLinks = document.querySelectorAll('a[href^="http"]');
for (var i = externalLinks.length-1; i >= 0; i--) {
externalLinks[i].addEventListener("click", function() { alert(); }, false);
}
I had to do this from scratch on my own site so I'll just copy + paste it here for you. It came from inside one of my objects so if I left some this keywords you can remove them.
function leaving() {
var links = document.anchors || document.links || document.getElementsByTagName('a');
for (var i = 0; i < links.length; i++) {
if ((links[i].getAttribute('href').indexOf('http') === 0 && links[i].getAttribute('href').indexOf('fleeceitout') < 0) && (links[i].getAttribute('href').indexOf('/') !== 0 && links[i].getAttribute('href').indexOf('#') !== 0) && links[i].className.indexOf('colorbox') < 0) {
addEvent(links[i], 'click', this.action);
}
}
}
function action(evt) {
var e = evt || window.event,
link = (e.currentTarget) ? e.currentTarget : e.srcElement;
if (e.preventDefault) {
e.preventDefault();
} else {
window.location.href = link.href;
return;
}
var leave = confirm("You are now leaving the _______ website. If you want to stay, click cancel.");
if (leave) {
window.location.href = link.href;
return;
} else {
return leave;
}
}
var addEvent = function (element, myEvent, fnc) {
return ((element.attachEvent) ? element.attachEvent('on' + myEvent, fnc) : element.addEventListener(myEvent, fnc, false));
};
Replace instances of 'fleeceitout' with your sites domain name (microsoft.com, etc) and you're set.
The easiest ways are with jQuery, using a special class for external links, or by checking for "http://" in the URL.
Like this, if using a special class:
$("a.external").on("click", function() {
//de Do something special here, before going to the link.
//de URL is: $(this).attr("href")
});
And then in HTML:
<a href="http://external.link" class='external'>external link</a>
Or, you can check for http:// in the URL! Then you don't need a special class.
$('a[href=^"http://"]').on("click", function() {
//de Do something special here, before going to the link.
//de URL is: $(this).attr("href")
});
Cite: My original method of testing for "http://" was a bit slower, actually doing an indexOf test on .attr("href") so I used #Matthew's selector choice instead. Forgot about the caret route! Props to #Matthew on that, and for the non-jQuery alternative.
$(document).ready(function() {
$('a').click(function() {
var returnType= true;
var link = $(this).attr('href');
if ( link.indexOf('http') >= 0 ) {
returnType=confirm('You are browsing to an external link.');
}
return returnType;
});
});`

Javascript Detect click event outside of div [duplicate]

This question already has answers here:
How do I detect a click outside an element?
(91 answers)
Closed 1 year ago.
The community reviewed whether to reopen this question last year and left it closed:
Original close reason(s) were not resolved
I have a div with id="content-area", when a user clicks outside of this div, I would like to alert them to the fact that they clicked outside of it. How would I use JavaScript to solve this issue?
<div id = "outer-container">
<div id = "content-area">
Display Conents
</div>
</div>
In pure Javascript
Check out this fiddle and see if that's what you're after!
document.getElementById('outer-container').onclick = function(e) {
if(e.target != document.getElementById('content-area')) {
document.getElementById('content-area').innerHTML = 'You clicked outside.';
} else {
document.getElementById('content-area').innerHTML = 'Display Contents';
}
}
http://jsfiddle.net/DUhP6/2/
The Node.contains() method returns a Boolean value indicating whether a node is a descendant of a given node or not
You can catch events using
document.addEventListener("click", clickOutside, false);
function clickOutside(e) {
const inside = document.getElementById('content-area').contains(e.target);
}
Remember to remove the event listened in the right place
document.removeEventListener("click", clickOutside, false)
Bind the onClick-Event to an element that is outside your content area, e.g. the body. Then, inside the event, check whether the target is the content area or a direct or indirect child of the content area. If not, then alert.
I made a function that checks whether it's a child or not. It returns true if the parent of a node is the searched parent. If not, then it checks whether it actually has a parent. If not, then it returns false. If it has a parent, but it's not the searched one, that it checks whether the parent's parent is the searched parent.
function isChildOf(child, parent) {
if (child.parentNode === parent) {
return true;
} else if (child.parentNode === null) {
return false;
} else {
return isChildOf(child.parentNode, parent);
}
}
Also check out the Live Example (content-area = gray)!
I made a simple and small js library to do this for you:
It hijacks the native addEventListener, to create a outclick event and also has a setter on the prototype for .onoutclick
Basic Usage
Using outclick you can register event listeners on DOM elements to detect whether another element that was that element or another element inside it was clicked. The most common use of this is in menus.
var menu = document.getElementById('menu')
menu.onoutclick = function () {
hide(menu)
}
this can also be done using the addEventListener method
var menu = document.getElementById('menu')
menu.addEventListener('outclick', function (e) {
hide(menu)
})
Alternatively, you can also use the html attribute outclick to trigger an event. This does not handle dynamic HTML, and we have no plans to add that, yet
<div outclick="someFunc()"></div>
Have fun!
Use document.activeElement to see which of your html elements is active.
Here is a reference:
document.activeElement in MDN
$('#outer-container').on('click', function (e) {
if (e.target === this) {
alert('clicked outside');
}
});
This is for the case that you click inside the outer-container but outside of the content-area.
Here is the fiddle : http://jsfiddle.net/uQAMm/1/
$('#outercontainer:not(#contentarea)').on('click', function(event){df(event)} );
function df(evenement)
{
var xstart = $('#contentarea').offset().left;
var xend = $('#contentarea').offset().left + $('#contentarea').width();
var ystart = $('#contentarea').offset().top;
var yend = $('#contentarea').offset().top + $('#contentarea').height();
var xx = evenement.clientX;
var yy = evenement.clientY;
if ( !( ( xx >= xstart && xx <= xend ) && ( yy >= ystart && yy <= yend )) )
{
alert('out');
}
}
use jquery as its best for DOM access
$(document).click(function(e){
if($(e.target).is("#content-area") || $(e.target).closest("#content-area").length)
alert("inside content area");
else alert("you clicked out side content area");
});
Put this into your document:
<script>
document.onclick = function(e) {
if(e.target.id != 'content-area') alert('you clicked outside of content area');
}
</script>
Here is a simple eventListener that checks all parent elements if any contain the id of the element. Otherwise, the click was outside the element
html
<div id="element-id"></div>
js
const handleMouseDown = (ev) => {
let clickOutside = true
let el = ev.target
while (el.parentElement) {
if (el.id === "element-id") clickOutside = false
el = el.parentElement
}
if (clickOutside) {
// do whatever you wanna do if clicking outside
}
}
document.addEventListener("mousedown", handleMouseDown)

Use JavaScript to intercept all document link clicks

How do I intercept link clicks in document?
It must be cross-platform.
I am looking for something like this:
// content is a div with innerHTML
var content = document.getElementById("ControlPanelContent");
content.addEventListener("click", ContentClick, false);
function ContentClick(event) {
if(event.href == "http://oldurl")
{
event.href = "http://newurl";
}
}
What about the case where the links are being generated while the page is being used? This occurs frequently with today's more complex front end frameworks.
The proper solution would probably be to put the click event listener on the document. This is because events on elements propagate to their parents and because a link is actually acted upon by the top-most parent.
This will work for all links, whether they are loaded with the page, or generated dynamically on the front end at any point in time.
function interceptClickEvent(e) {
var href;
var target = e.target || e.srcElement;
if (target.tagName === 'A') {
href = target.getAttribute('href');
//put your logic here...
if (true) {
//tell the browser not to respond to the link click
e.preventDefault();
}
}
}
//listen for link click events at the document level
if (document.addEventListener) {
document.addEventListener('click', interceptClickEvent);
} else if (document.attachEvent) {
document.attachEvent('onclick', interceptClickEvent);
}
for (var ls = document.links, numLinks = ls.length, i=0; i<numLinks; i++){
ls[i].href= "...torture puppies here...";
}
alternatively if you just want to intercept, not change, add an onclick handler. This will get called before navigating to the url:
var handler = function(){
...torment kittens here...
}
for (var ls = document.links, numLinks = ls.length, i=0; i<numLinks; i++){
ls[i].onclick= handler;
}
Note that document.links also contains AREA elements with a href attribute - not just A elements.
I just found this out and it may help some people. In addition to interception, if you want to disallow the link to load another page or reload the current page. Just set the href to '#' (as in internal page ref prefix). Now you can use the link to call a function while staying at the same page.

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