Develop Reference

How to extend Leaflet Icon Class to add data-open attribute to marker HTML?

I'm trying to trigger some functionality based on the click of a marker on a GeoJSON layer in Leaflet. The eventual functionality I'm trying to implement is a flyout, or scroll out type modal populated from the individual feature's JSON attributes. Essentially, I'm trying to implement the functionality in this Tutsplus Tutorial with dynamic feature content based on the marker click.
I THINK I've figured out most of the pieces I need, but I'm struggling with how to add a data attribute, specifically data-open, to the individual marker. Building on an earlier question of mine I've realized it's not enough to just update a DOM element's CSS, but rather my app should be implementing changes based on data attributes to fully get the functionality I want.
From this question I know that this should be done by extending the L.Icon class that Leaflet provides, but the answer is a bit too terse for my current JS skills. I apologize for this effectively being a "ELI5" of a previously asked question, but I'm not sure where the options and slug come into function. I think they're implied by the question, rather than the answer I'm citing and being set on the marker itself.
Here's a simplified version of the the click handler on my markers, which grabs and zooms to location, gets feature info, and populates that info to a div. The zoom functionality works, as does extracting and placing the feature info, but I'm struggling with how to connect the functionality to trigger the modal and place the div with the feature info over the map.
function zoomToFeature(e) {
var latLngs = [e.target.getLatLng()];
var markerBounds = L.latLngBounds(latLngs);
var street = e.target.feature.properties.str_addr;
document.getElementById('street').textContent = street;
mymap.fitBounds(markerBounds);
//where the modal trigger should be
document.getElementById('infoBox').classList.add('is-visible');
}
Here are the event listeners taken from the linked tutorial, which are currently not firing, but I have them working in a standalone implementation:
const openEls = document.querySelectorAll("[data-open]");
const closeEls = document.querySelectorAll("[data-close]");
const isVisible = "is-visible";
//this is the event I want to trigger on marker click
for (const el of openEls) {
el.addEventListener("click", function() {
const modalId = this.dataset.open;
console.log(this);
document.getElementById(modalId).classList.add(isVisible);
});
}
for (const el of closeEls) {
el.addEventListener("click", function() {
this.parentElement.parentElement.parentElement.classList.remove(isVisible);
});
}
document.addEventListener("click", e => {
if (e.target == document.querySelector(".modal.is-visible")) {
document.querySelector(".modal.is-visible").classList.remove(isVisible);
}
});
So, where I'm trying to get is that when my markers are clicked, the trigger the modal to appear over the map. So, I think I'm missing connecting the marker click event with the event that triggers the modal. I think what's missing is adding the data attribute to the markers, or some way chain the events without the data attributes. As there's no direct way to add an attribute to the markers, I try to add slug option on my circle markers:
var circleMarkerOptions = {
radius: 2,
weight: 1,
opacity: 1,
fillOpacity: 0.8,
slug: 'open',
}
and If I read the previously asked question's answer correctly, than extending the Icon Class this way should add a data-open attribute.
L.Icon.DataMarkup = L.Icon.extend({
_setIconStyles: function(img, name) {
L.Icon.prototype._setIconStyles.call(this, img, name);
if (options.slug) {
img.dataset.slug = options.slug;
}
}
});
A stripped down version of my code is here (thanks #ghybs). My full implementation pulls the markers from a PostGIS table. It's a bit hard to see in the Plunker, but this code adds my class to my modal, but doesn't trigger the functionality. It does trigger the visibility if the class is manually updated to modal.is-visible, but the current implementation which renders modal is-visbile doesn't, which I think is because the CSS is interpreted on page load(?) and not in response to the update via the dev tools, while the concatenated css class matches extactly(?). When I do trigger the modal via the dev tools, the close modal listeners don't seem to work, so I'm also missing that piece of the puzzle.

So, it's a work-around to setting the data attribute, but I realized I was shoe-horning a solution where it wasn't needed. Assuming someone ends up with the same mental block. Appropriate listeners on the modal close button and another function passed to the existing marker click listener produce the desired functionality.
const closeM = document.querySelector(".close-modal");
closeM.addEventListener("click", closeMe);
var modal = document.getElementById('infoBox');
and
function modalAction(){
modal.style.display = 'block';
}
function closeMe(){
modal.style.display = 'none';
}

onclick even after loading a map - ammap

I am using a small script I modified that uses ammaps library. I use the world map and if I click on certain countries it will load the country's map including the states.
Now, I am struggling on finding a solution to that after I opened a country and click on a state I want to use an onclick event then to just open up the appropriate website for that state. My jsfiddle is here http://jsfiddle.net/xzAx7/ and I would appreciate any help.
This is my code how I load new maps after I clicked on the country. These maps include the states.
map.addListener("clickMapObject", function (event) {
if (event.mapObject.id == "FR") {
loadNewMap("http://www.ammap.com/lib/maps/js/franceLow.js", "franceLow");
}
else if (event.mapObject.id == "RU") {
loadNewMap("http://www.ammap.com/lib/maps/js/russiaLow.js", "russiaLow");
}
else if (event.mapObject.id == "US") {
loadNewMap("http://www.ammap.com/lib/maps/js/usaLow.js", "usaLow");
}
});

I would move the handler to a separate function and would add another if, which would also check the id and generate url.
If you can not generate URL's automatically, then you should not use getAreasFromMap option but add each area in new data provider and set url property for the areas.

if (event.mapObject.id == "FR") {
map.clear();
map.dataProvider.mapVar = AmCharts.maps.franceLow;
map.write("mapdiv");
};

How to check whether a twitter bootstrap popover is visible or not?

I have an element $('#anElement') with a potential popover attached, like
<div id="anElement" data-original-title="my title" data-trigger="manual" data-content="my content" rel="popover"></div>
I just would like to know how to check whether the popover is visible or not: how this can be accomplished with jQuery?

If this functionality is not built into the framework you are using (it's no longer twitter bootstrap, just bootstrap), then you'll have to inspect the HTML that is generated/modified to create this feature of bootstrap.
Take a look at the popupver documentation. There is a button there that you can use to see it in action. This is a great place to inspect the HTML elements that are at work behind the scene.
Crack open your chrome developers tools or firebug (of firefox) and take a look at what it happening. It looks like there is simply a <div> being inserted after the button -
<div class="popover fade right in" style="... />
All you would have to do is check for the existence of that element. Depending on how your markup is written, you could use something like this -
if ($("#popoverTrigger").next('div.popover:visible').length){
// popover is visible
}
#popoverTrigger is the element that triggered that popover to appear in the first place and as we noticed above, bootstrap simply appends the popover div after the element.

There is no method implemented explicitly in the boostrap popover plugin so you need to find a way around that. Here's a hack that will return true or false wheter the plugin is visible or not.
var isVisible = $('#anElement').data('bs.popover').tip().hasClass('in');
console.log(isVisible); // true or false
It accesses the data stored by the popover plugin which is in fact a Popover object, calls the object's tip() method which is responsible for fetching the tip element, and then checks if the element returned has the class in, which is indicative that the popover attached to that element is visible.
You should also check if there is a popover attached to make sure you can call the tip() method:
if ($('#anElement').data('bs.popover') instanceof Popover) {
// do your popover visibility check here
}

In the current version of Bootstrap, you can check whether your element has aria-describedby set. The value of the attribute is the id of the actual popover.
So for instance, if you want to change the content of the visible popover, you can do:
var popoverId = $('#myElement').attr('aria-describedby');
$('#myElement').next(popoverid, '.popover-content').html('my new content');

This checks if the given div is visible.
if ($('#div:visible').length > 0)
or
if ($('#div').is(':visible'))

Perhaps the most reliable option would be listening to shown/hidden events, as demonstrated below. This would eliminate the necessity of digging deep into the DOM that could be error prone.
var isMyPopoverVisible = false;//assuming popovers are hidden by default
$("#myPopoverElement").on('shown.bs.popover',function(){
isMyPopoverVisible = true;
});
$("#myPopoverElement").on('hidden.bs.popover',function(){
isMyPopoverVisible = false;
});
These events seem to be triggered even if you hide/show/toggle the popover programmatically, without user interaction.
P. S. tested with BS3.

Here is simple jQuery plugin to manage this. I've added few commented options to present different approaches of accessing objects and left uncommented that of my favor.
For current Bootstrap 4.0.0 you can take bundle with Popover.js: https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.bundle.min.js
// jQuery plugins
(function($)
{
// Fired immiedately
$.fn.isPopover = function (options)
{
// Is popover?
// jQuery
//var result = $(this).hasAttr("data-toggle");
// Popover API
var result = !!$(this).data('bs.popover');
if (!options) return result;
var $tip = this.popoverTip();
if (result) switch (options)
{
case 'shown' :
result = $tip.is(':visible');
break;
default:
result = false;
}
return result;
};
$.fn.popoverTip = function ()
{
// jQuery
var tipId = '#' + this.attr('aria-describedby');
return $(tipId);
// Popover API by id
//var tipId = this.data('bs.popover').tip.id;
//return $(tipId);
// Popover API by object
//var tip = this.data('bs.popover').tip; // DOM element
//return $(tip);
};
// Load indicator
$.fn.loadIndicator = function (action)
{
var indicatorClass = 'loading';
// Take parent if no container has been defined
var $container = this.closest('.loading-container') || this.parent();
switch (action)
{
case 'show' :
$container.append($('<div>').addClass(indicatorClass));
break;
case 'hide' :
$container.find('.' + indicatorClass).remove();
break;
}
};
})(jQuery);
// Usage
// Assuming 'this' points to popover object (e.g. an anchor or a button)
// Check if popover tip is visible
var isVisible = $(this).isPopover('shown');
// Hide all popovers except this
if (!isVisible) $('[data-toggle="popover"]').not(this).popover('hide');
// Show load indicator inside tip on 'shown' event while loading an iframe content
$(this).on('shown.bs.popover', function ()
{
$(this).popoverTip().find('iframe').loadIndicator('show');
});

Here a way to check the state with Vanilla JS.
document.getElementById("popover-dashboard").nextElementSibling.classList.contains('popover');

This works with BS4:
$(document).on('show.bs.tooltip','#anElement', function() {
$('#anElement').data('isvisible', true);
});
$(document).on('hidden.bs.tooltip','#anElement', function() {
$('#anElement').data('isvisible', false);
});
if ($('#anElement').data('isvisible'))
{
// popover is visible
$('#tipUTAbiertas').tooltip('hide');
$('#tipUTAbiertas').tooltip('show');
}

Bootstrap 5:
const toggler = document.getElementById(togglerId);
const popover = bootstrap.Popover.getInstance(toggler);
const isShowing = popover && popover.tip && popover.tip.classList.contains('show');

Using a popover with boostrap 4, tip() doesn't seem to be a function anymore. This is one way to check if a popover is enabled, basically if it has been clicked and is active:
if ($('#element').data('bs.popover')._activeTrigger.click == true){
...do something
}

Create Google Map v3 After Clicking On An Element

What I would like to do is create a map after an element is clicked on. I'm using Google Maps v3.
I have a Realty listing page that shows 15 results/properties per page. Instead of generating 15 maps I would like 1 map to be created when I click on an element. Once clicked on, the map generation process takes place. The map canvas/div is initially hidden.
I was thinking that the click element and map element relationship would be something like this:
<span id="12-1234" lat="10.101010" lng="-25.252525" class="view-map">View Map</span>
... other markup ...
<div id="12-1234-map" class="google-map"></div>
Using HTML5 I add custom attributes to the element about the property like id, latitude and longitude so I can change the icon and center the map.
I've got a functioning map from which I load markers from a dynamically generated XML file based on the search parameters.
I've been looking at addListener and addDomListener but haven't had any luck. Most searches just pull up issues related to markers.
I had a wonky thing that sort of worked that used jQuery. Something like this:
$('.view-map').click(function(){
google.maps.event.addDomListener( this, 'click', initialize );
$("#" + this.id + "-map").toggle();
});
Obviously this wasn't perfect as you'd have to click the element a couple more times before seeing the map as you've bound another click event to it after having already clicking on it.
I feel like I'm missing something obvious.

function initialize(link) {
var mapDiv = $('#' + link.attr('id') + '-map');
mapDiv.toggle();
var options = {
zoom: 10,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: new google.maps.LatLng(link.attr('lat'), link.attr('lng'))
};
var map = new google.maps.Map(mapDiv[0], options);
}
$('.view-map').click(function(){
initialize(this);
});

In your view-map click function, just call a map initialize method, passing in the appropriate values. This initialize function can then show the map div, and then initialize the map appropriately.
Ugly and unchecked example:
var params = {
lat : 47.5,
lng : -122.5 }
$('.view-map').click(params, function(){
params.id = this.id //e.g. 1234
initialize(params);
});
function initialize(params){
// show the 1234-map div, initialize the map
}

Explicitly Displaying the jQuery.Tooltip plugin

I'm using the jQuery Tooltip control, http://docs.jquery.com/Plugins/Tooltip and it works really well. However, I have a task to show the tooltip when someone types 2 characters into an autocomplete control. I have it all hooked up to do it, but I do not know how to explicitly show the jQuery tooltip plugin.
MyCompany.UI.Controls.AutoCompleteExtender = new function() {
/// <summary>
/// An extension of the autcomplete control.
/// </summary>
// Private Members
var _this = this;
// Public Members
this.charsBeforeShowingTooltip = 2; // Change this value via server-side code if
// clients want different values.
this.showTooltip = function() {
var item;
if (this.value.length === _this.charsBeforeShowingTooltip) {
// Explicitly show the tooltip after two characters have been entered.
alert('show the tooltip explicitly');
}
}
}
And later on in server-side generated code, the following JavaScript renders to the page
$(document.ready(function() {
$('#someClientId').bind('keyup', MyCompany.UI.Controls.AutoCompleteExtender.showTooltip);
});
Now this all works except I don't know how to explicitly show the tooltip plugin. I've tried the following and none of them work:
...
this.showTooltip = function() {
var item;
if (this.value.length === _this.charsBeforeShowingTooltip) {
// Explicitly show the tooltip after two characters have been entered.
$(this).hover(); // doesn't work
$(this).trigger('mouseover'); // doesn't work
$(this).trigger('mouseenter'); // doesn't work
}
}
...
I also tried adding the CSS class show-tooltip (got that from Google), but that didn't work either.
Aside from modifying the plugin, is there a way to do this out of the box?

Well there were a couple of issues. The control that I thought had the title tag didn't (always check the obvious first!). The title tag was actually on a table row, not the control in a table cell. OK, so that got the mouseover firing, however when I explicitly fired the mouse over event, the jQuery Tooltip plugin was throwing an error that event.pageX and event.pageY were undefined.
The reason why they were undefined was because the event was explicitly fired, so there were no X/Y coordinates being passed in the event object from the mouse. So what I did was modify the jQuery Tooltip plugin to check if these are undefined as well. If they are the offsetLeft and offsetTop properties of the helper.parent control in the Tooltip plugin are used instead.
Here is the code I modified in the Tooltip plugin:
/**
* callback for mousemove
* updates the helper position
* removes itself when no current element
*/
function update(event) {
// ... code omitted for clarity
// if (event) { // This was the old check
if (event && typeof(event.pageX) !== "undefined" && typeof(event.pageY) !== "undefined") {
// ... more code omitted for clarity
}
// ... even more code omitted for clarity
}
Thanks again to Joern Zaefferer for creating this plugin, http://bassistance.de/jquery-plugins/jquery-plugin-tooltip.