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How to highlight a line when mouse over it in observable plot using JavaScript?

My chart looks like so::
and here is my code:
linePlot = Plot.plot({
marginLeft: 60, // space to the left of the chart
y: {
type: "log", // set the type
},
marks: [
Plot.line(data, {x: "timestamp", y: "views", z:"artist", title: d=>`${d.artist}`,})
]
})
I want to highlight or change color of each line when the mouse is over it.

The easiest thing to do would be to attach a pointerenter event to the lines. Since you're using Observable, to use D3 to handle that process. Here's what it looks like on Observable:
https://observablehq.com/d/2e1daf099a7aaaea
To be clear, you are using two libraries: D3 and Plot, both of which are automatically available on Observable. You can use them both in vanilla Javascript pretty easily, though:
// Manufacture some data
let pt_lists = d3.range(10).map(() => {
let cur = 0;
return d3.range(1000).map(function(x) {
let step = 2 * d3.randomInt(0, 2)() - 1;
cur = cur + step;
return [x, cur];
});
});
// Plot the data
let plot = Plot.plot({
marks: pt_lists.map((pts) => Plot.line(pts, {
strokeWidth: 2
}))
});
// Here's where the action is.
// We use d3 to select all the paths in the plot
d3.select(plot)
.selectAll("path")
// React when the pointer hovers over the path.
.on("pointerenter", function() {
d3.select(plot).selectAll("path").attr("opacity", 0.2);
d3.select(this).attr("opacity", 1);
});
// Reset the appearance when the pointer leaves the SVG
d3.select(plot).on("pointerleave", function() {
d3.select(plot).selectAll("path").attr("opacity", 1);
});
// Attach the plot to the container DIV
d3.select('#chart').append(() => plot)
<script src="https://cdn.jsdelivr.net/npm/d3#7"></script>
<script src="https://cdn.jsdelivr.net/npm/#observablehq/plot#0.6"></script>
<div id="chart" style="width: 600px; height: 400px"></div>

It might also be possible to do the interaction in css:
d3.select(chart)
.append("svg:style")
.text(`
path:hover {stroke-width: 2px;}
`)

Add javascript to Wordpress loop with class selection

I would like to add category icons to a Wordpress page, each icon animated with snap.svg.
I added the div and inside an svg in the loop that prints the page (index.php). All divs are appearing with the right size of the svg, but blank.
The svg has a class that is targeted by the js file.
The js file is loaded and works fine by itself, but the animation appears only in the first div of that class, printed on each other as many times it is counted by the loop (how many posts there are on the actual page from that category).
I added "each()" and the beginning of the js, but is not allocating the animations on their proper places. I also tried to add double "each()" for the svg location and adding the snap object to svg too, but that was not working either.
I tried to add unique id to each svg with the post-id, but i could not pass the id from inside the loop to the js file. I went through many possible solutions I found here and else, but none were adaptable, because my php and js is too poor.
If you know how should I solve this, please answer me. Thank you!
// This is the js code (a little trimmed, because the path is long with many randoms, but everything else is there):
jQuery(document).ready(function(){
jQuery(".d-icon").each(function() {
var dicon = Snap(".d-icon");
var dfirepath = dicon.path("M250 377 C"+ ......+ z").attr({ id: "dfirepath", class: "dfire", fill: "none", });
function animpath(){ dfirepath.animate({ 'd':"M250 377 C"+(Math.floor(Math.random() * 20 + 271))+ .....+ z" }, 200, mina.linear);};
function setIntervalX(callback, delay, repetitions, complete) { var x = 0; var intervalID = window.setInterval(function () { callback(); if (++x === repetitions) { window.clearInterval(intervalID); complete();} }, delay); }
var dman = dicon.path("m136 ..... 0z").attr({ id: "dman", class:"dman", fill: "#222", transform: "r70", });
var dslip = dicon.path("m307 ..... 0z").attr({ id: "dslip", class:"dslip", fill: "#196ff1", transform:"s0 0"});
var dani1 = function() { dslip.animate({ transform: "s1 1"}, 500, dani2); }
var dani2 = function() { dman.animate({ transform: 'r0 ' + dman.getBBox().cx + ' ' + dman.getBBox(0).cy, opacity:"1" }, 500, dani3 ); }
var dani3 = function() { dslip.animate({ transform: "s0 0"}, 300); dman.animate({ transform: "s0 0"}, 300, dani4); }
var dani4 = function() { dfirepath.animate({fill: "#d62a2a"}, 30, dani5); }
var dani5 = function() { setIntervalX(animpath, 200, 10, dani6); }
var dani6 = function() { dfirepath.animate({fill: "#fff"}, 30); dman.animate({ transform: "s1 1"}, 100); }
dani1(); }); });

I guess your error is here:
var dicon = Snap(".d-icon");
You are passing a query selector to the Snap constructor, this means Snap always tries to get the first DOM element with that class, hence why you're getting the animations at the wrong place.
You can either correct that in two ways:
Declare width and height inside the constructor, for example var dicon = Snap(800, 600);
Since you are using jQuery you can access to the current element inside .each() with the $(this) keyword. Since you are using jQuery instead of the dollar you could use jQuery(this).
Please keep in mind this is a jQuery object and probably Snap will require a DOM object. In jQuery you can access the dom object by appending a [0] after the this keyword. If var dicon = Snap( jQuery(this) ); does not work you can try with var dicon = Snap( jQuery(this)[0] );
Additionally, you have several .attr({id : '...', in your code. I assume you are trying to associate to the paths an ID which are not unique. These should be relatively safe since they sit inside a SVG element and I don't see you are using those ID for future selection.
But if you have to select those at a later time I would suggest to append to these a numerical value so you wont have colliding ID names.

Appcelerator scope issue when clicking a view

I'm going crazy here trying o work out why the scoping of my variable won't pick up the right value from a loop of 60 items from a DB in my Appcelerator project.
My map marker displays the correct label, but when I click it, no matter what combo of scoping I try, I cannot get the correct value in the alert. It just returns the 60th entry every time.
Likely a schoolboy error, but this is driving me nuts.
This is my function
function loadAnimals() {
var db = Ti.Database.open('myDB');
var getSpecies = db.execute('select * from species');
while (getSpecies.isValidRow()) {
var speciesID = getSpecies.fieldByName('speciesnid');
var speciesName = getSpecies.fieldByName('speciesname');
var speciesDesc = getSpecies.fieldByName('speciesdescription');
var speciesLatitude = getSpecies.fieldByName('specieslatitude');
var speciesLongitude = getSpecies.fieldByName('specieslongitude');
var speciesConStatus = getSpecies.fieldByName('speciesconservationstatus');
var speciesMarkerFilename = getSpecies.fieldByName('speciesiconfilename');
var speciesMarkerIcon = getSpecies.fieldByName('speciesmapicon');
var speciesMarkerURI = getSpecies.fieldByName('speciesmapiconurl');
var speciesImageFullPath = speciesMarkerURI.replace("public://", "http://myurl.com/");
var speciesImageFullPath = speciesImageFullPath.replace(" ", "%20");
var imageFile = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, speciesMarkerIcon);
var iconFile = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, speciesMarkerFilename);
var annotationView = Ti.UI.createView({
backgroundColor: '#222222',
width: 150,
height: 75,
layout:'vertical'
});
var addtoTourView = Ti.UI.createView({
height:20,
backgroundColor:'#6ea108'
});
var addtoTourTitle = Ti.UI.createLabel({
color: '#FFF',
text: 'ADD TO TOUR',
width: 150,
height: 15,
top:3,
textAlign: 'center',
font: {
fontSize: 14,
fontWeight: 'bold'
}
});
var annotationTitle = Ti.UI.createLabel({
color: '#FFF',
text: 'test',
width: 150,
height:15,
top:0,
textAlign: 'center',
font: {
fontSize: 14,
fontWeight: 'normal'
}
});
var blankView = Ti.UI.createView({
backgroundColor: '#222222',
width: 1,
height: 73,
borderRadius: 0
});
annotationView.add(addtoTourView);
addtoTourView.add(addtoTourTitle);
annotationView.add(annotationTitle);
annotations.push(Map.createAnnotation({
latitude: speciesLatitude,
longitude: speciesLongitude,
title: ' ',
//pincolor: Map.ANNOTATION_RED,
image: iconFile,
animate: true,
myid: speciesID,
rightView: annotationView,
leftView: blankView
}));
addtoTourView.addEventListener('click', function(e) {
//alert(speciesName + ' has dded to Tour');
var dialog = Ti.UI.createAlertDialog({
message: 'Added to your Tour',
ok: 'Continue',
title: speciesName //this is the 60th entry, not the correct one
});
dialog.show();
// do the insert into the DB
var db = Ti.Database.open('myDB');
db.execute('INSERT INTO tour (speciesnid) VALUES (?)', speciesID); // same with this ID, needs to the correct ID
db.close();
});
annotationTitle.text = speciesName;
//load up the next record
getSpecies.next();
};
// close the database
getSpecies.close();
// add markers to map
mapview.annotations = annotations;
};// end of loadAnimals fucntion
Can anyone suggest what I'm doing wrong?

Michaels solution sounds right.
Let me post what I was gonna say anyway. I focus on explaining the scope problem, on why your code doesn't do what you expected.
In javascript the scope is bound to the function. When you declare a variable within a loop (for/while/do...) things can get a little confusing. You are not creating new variables, you are just overriding the value of the first (and only) variable with that name.
So, you have 1 variable in function loadAnimals, called speciesName. In the while-loop you just override the value of that variable. After the 60'th iteration, the variable just remembers the last thing you set it to.
When the client clicks on the marker, the loop is finished, the value has been set a long time ago.
Notice: there are probably solutions provided by your map service, but I don't know about that.
1 solution: 'this'.
The 'this' variable tells you what has been affected. Inside a onClick callback, this is the element that was clicked on.
The solution to your problem will probably involve 'this'. But I'm not sure exactly how.
Here an example of what I mean.
<h2>Click on the animal</h2>
<p>dog</p>
<p>cat</p>
<p>hamster</p>
<script>
function loadAnimals() {
var speciesName = '';
var animalElements = document.getElementsByTagName('p');
for (var i=0; i<animalElements.length; i++) {
speciesName = animalElements[i].innerHTML ; // notice, this variable will be overridden, so this variable is useless within the onClick callback.
animalElements[i].addEventListener('click', function(e) {
// variable 'this' is the <p> that was clicked on.
var value_clicked_on = this.innerHTML;
alert(value_clicked_on);
});
}
}
window.onload = loadAnimals;
</script>

When creating your annotations array to add to to the map add your title to the annotation paramters as well as the speciesID which you are setting with the key - myid.
annotations.push(Map.createAnnotation({
latitude: speciesLatitude,
longitude: speciesLongitude,
title: ' ',
//pincolor: Map.ANNOTATION_RED,
image: iconFile,
animate: true,
myid: speciesID, // We'll be querying this
myname: speciesName, // and also this
rightView: annotationView,
leftView: blankView
}));
Then add your event listener once onto the map object instead of each individual annotation object. This manages memory more efficiently and is the correct way to add it. Don't add the event listener on for every annotation, this is bad practise.
// Handle click events on any annotations on this map.
mapview.addEventListener('click', function(evt) {
Ti.API.info("speciesID " + evt.annotation.myid + " clicked, speciesName: " + evt.annotation.myname);
});
On this single event listener you can now create your alert dialog and DB insert by accessing each annotations individual properties by inspecting
evt.annotation
On the Map object you can do the following as well:
The click event includes a value which you can interrogate clicksource
This clicksource will let you know the source - pin, annotation, leftButton, rightButton, leftView, rightView, title, or subtitle which you can use in the event listener.
Also available is the source object that fired the event - source. You can then test if the clicksource is not null and the source is coming from the "ADD TO TOUR" element that you want to place the trigger on. still getting all your annotation properties from evt.annotation

the red circle's click event is invoked twice in IE8

when I click the red circle, the window will popup a alert once.
It works fine in firefox and chrome, but in ie8, it's popup alerts twice.
How could I fix it?
please see my code in the following:
Raphael("world", 1000, 400, function () {
var r = this;
r.rect(0, 0, 1000, 400, 0).attr({
stroke: "none",
fill: "0-#9bb7cb-#adc8da"
});
var click = function(){
alert(this.type);
};
r.setStart();
var hue = Math.random();
for (var country in worldmap.shapes) {
r.path(worldmap.shapes[country]).attr({stroke: "#ccc6ae", fill: "#f0efeb", "stroke-opacity": 0.25});
}
var dot = r.circle(772.9870633333333, 166.90446666666668).attr({
title: "Point",
fill: "red",
stroke: "#fff",
"stroke-width": 2,
r: 5
});
var world = r.setFinish();
world.click(click);
});

I've had this problem a few time. Solved it by using a mouse up event instead of a click event. IE sucks.

I find a way to fix this issue, replace the Raphael Set Object with a array Object to push all Rahpael Elements Object, then loop the array to add click event for each Element.
see the following code:
var set = [];
// r.setStart();
for (var country in worldmap.shapes) {
var element = r.path(worldmap.shapes[country]).attr({stroke: "#ccc6ae", fill: "#f0efeb", "stroke-opacity": 0.25});
set.push(element);
}
var dot = r.circle(772.9870633333333, 160.90446666666668 , 5).attr({
title: "Point",
fill: "red",
stroke: "#fff",
"stroke-width": 2
});
set.push(dot);
for(var i = 0; i < set.length; i++){
var element = set[i];
element.click(click);
}
// var world = r.setFinish();
// world.click(click);

I had a similar problem in Firefox, although what I was doing was completely different.
The way I solved it was to prevent the event from firing twice in too short of an interval.
I would use this function:
function rateLimit(func) {
var lastcall = func.lastcall || 0,
now = new Date().getTime();
if( now-lastcall < 250) return false;
func.lastcall = now;
return true;
}
Then in the function I want to limit from firing too often, I can do this:
if( !rateLimit(arguments.callee)) return false;
However, you might have a small issue if you are using alert(), since that will completely block execution and the second run will still fire. I would strongly suggest using console.log() instead of alert() to keep track of values, as this will avoid interrupting the flow of the program (especially when you get into asynchronous stuff, you can get real mysteries if you stop things with an alert)
Hope this helps!

In raphaeljs, is there a way to place text within an object to keep rollover state

In creating a svg map using raphael js where I have hover states. How ever I am trying to write the country names onto the map. The problem I am facing is the names become their own object and block the country so I loose hover and click when the cursor is directly over the text. Is there a way where I can draw the text and not have it block the map. I've tried set() but with no sucess.
Thanks,
What I have below doesn't have the text() or print() included:
var r = Raphael('map', 1450, 2180);
arr = new Array();
for (var country in paths) {
var obj = r.path(paths[country].path);
countryName = paths[country].name;
color = paths[country].color;
scolor = paths[country].stroke;
obj.attr({fill:color,stroke:scolor,
'stroke-width': 1,
'stroke-linejoin': 'round'});
arr[obj.id] = country;
obj
.hover(function(){
console.log(arr[this.id]);
this.animate({
fill: paths[arr[this.id]].hover
}, 300);
}, function(){
this.animate({
fill: paths[arr[this.id]].color
}, 300);
})
});

Try setting the pointer-events attribute to none for the text elements.
Documentation:
http://www.w3.org/TR/SVG/interact.html#PointerEventsProperty