Hide specific points in series - javascript

I need to toggle specific points in a series in Highcharts based on a value in the data object. Is this possible at all? I can't see anything in the API that says a point within a series can be toggled.
I know I can remove points specifically, but I would much rather hide them, as the user will want to show/hide rather frequently, and I don't want to rebuild the whole series every time.

You can use Point.update and set the marker radius to 0.
selectedPoint.update({marker: { radius: 0 }});

The way to go is to use the point.remove and series.addpoint calls. I don't think that highcharts has a concept of hidden points.

Related

Manipulation of Google Graph - show / hide records

I have been looking around for a simple'ish solution that would allowing user to disable certain records on the graph. I know Google Charts API offeres ways to remove columns and rows. However, I don’t want to remove a row, I would like to “disable” it, so that it wouldn’t be used in the calculations, very similar to the google.visualization.ChartRangeFilter, except in ChartRangeFilter you set the date range to focuse on.
i.e. we have a line graph, x and y axis, with three lines for New York, London and Paris. I click on one of the points on the “Paris” line and that would disable that particular point, if I am to click on same point again than it will be enabled once again.
Options that were concidered:
1\ https://developers.google.com/chart/interactive/docs/events#the-select-event to try to "disable" the cell that user would click on.
2\ I have also been thinking to select all records by default and let user unselect them
Wondering if someone has a potential solution?
I found a similar solution, whichI was thinking to utilise, except their you hide / show the lines, rather than particular values..
In the fiddle example they use to make function happen
column: 6,
roleColumns: [7],
display: false
http://jsfiddle.net/asgallant/6gz2Q/

Highcharts Column Graph with background color?

I'm trying to make a column graph in Highcharts and it's not working out too hot. I'm essentially trying to give the column a background color that the data point can overlay. I want the effect of stacking without actually stacking if that makes sense. Any thoughts on what I can do?
Essentially I want it to look like a progress bar... there should be a distinct coloring between the top of the bar and the top of the graph itself. I've already tried stacking: percentage, but to no avail. Thoughts?
There are three options that come to mind:
1) To achieve the 'effect' of stacking, actually stack it: use a dummy series with a color set to the background color that you want, and set with values to fill the gap from the actual data.
Example:
http://jsfiddle.net/jlbriggs/Zf8C7/5/
[[edit for questions
The order of the series does not matter for this to work, and neither does the legendIndex.
What does matter, if you are using multiple series, is the stack property for each series - http://api.highcharts.com/highcharts#series.stack
Each group will need its own stack, and the dummy series and real series within each group need to be assigned to the same stack.
In addition, you need to have one overall max value.
Updated example:
http://jsfiddle.net/jlbriggs/4d9tm6b8/4/
(keep in mind, there are much smoother methods to process and build your data - this is a quick and dirty example whose purpose is to show how to properly use the stack property to do what you need)
]]
2) plotBands, as mentioned above
3) using the alternateGridColor property and set your data to skip an x axis
value between each point.
Reference:
- http://api.highcharts.com/highcharts#xAxis.alternateGridColor

Interactions that affect multiple separate charts in d3.js?

I'm trying to create a data visualization in d3.js that contains two charts: a parallel-axis plot, and horizontal colorbar chart (I just made up that name, but it's basically a series of colored rectangles). Each line in the parallel-axis plot is associated with a set of rectangles in the colorbar chart.
Right now, mousing over a given line highlights that line, and mousing over a given rectangle highlights that set of rectangles. My goal is to also highlight the associated line or set of rectangles on the opposite chart anytime the user mouses over either chart. This seems like it would be pretty straightforward if I generated both charts with the same function. However, it would be much neater (and more reusable) coding style to give each chart its own function and just connect them somehow. I tried having each within-chart mouseover function call a function defined at a higher level that affected both charts, but this didn't seem to have any effect on the chart that wasn't moused-over. Since I still don't feel like I fully understand how d3.js works on an underlying level, I'd really like to have confirmation that this is a viable way to set up my code. My code is long and complicated, and I really just want advice on the structure, so here is the basic outline:
function chart1(){
make chart
function mouseover(d,i){
do stuff
chart1_globalmouseover(d,i);
}
chartElement.on("mouseover", function(d,i){mouseover(d,i)});
}
function chart2(){
make chart
function mouseover(d,i){
do stuff
chart2_globalmouseover(d,i);
}
chartElement.on("mouseover", function(d,i){mouseover(d,i)});
}
function chart1_globalmouseover(d,i){
do stuff in chart 2's mouseover function
}
function chart2_globalmouseover(d,i){
do stuff in chart 1's mouseover function
}
c1 = chart1();
c2 = chart2();
One way to link the two graphs independent of the code used to create them would be to assign IDs or classes to the elements you may want to select. That is, if graph 2 has an element with ID foo, then in a mouse handler for an element of graph 1, you could say d3.select("#foo").style("stroke", "red") for example. Similarly with classes.
This approach allows you to keep the code completely separate. Moreover, if you use classes, you can assign the same class to things you would want to highlight together (e.g. elements representing the same data). Then d3.selectAll(".class") would select and allow you to manipulate all of them. This would work for an arbitrary number of graphs, not just two -- what changes is simply the number of elements that will be selected.

Highstocks: Move Renderer elements along with navigator/ Draw Trendlines

Is it possible to move any elements added using
chart.renderer
as we update the range or the navigator handles?
There is a square in this fiddle. Can we shift its position as we update the navigator?
Or can you point me to the function in the source code that can help?
Thanks
Update: i want to draw trendlines/ fibonnacci retracements etc. based on user events. Currently, i draw & drag the lines using chart.renderer until the mouseup event, calculate the x,y values of the end points, delete the rendered lines & then add new series which visually imitate those rendered lines. This is surely not the best solution. The issue is how to remember the position of the user selection & show/scale the same only when those lines are in the visible range.
So i am wondering if we could directly use some internal "scaling" function that calculates the visible points of the series based on the current extremes.
Rendered object's position is basend on pixels, so when you use navigator, pixels "are the same" so object stay in the same position. But you can catch navigator "sliding" by setExtremes and aftersetExtremes functions and then move element by translate().
Simple example of using translate():
obj.translate(120,20);
http://jsfiddle.net/Ne7QV/1/
Only what you need is common both elements, according to your expectations.

Randomly display dots

I am trying to design a little game using JS, and what I want it to do is make a random number say... 1-100 and then randomly scatter the dots (I used periods with the font size at 200) on the screen. By random, I just mean that I don't want them to be arranged in rows and columns. What I have so far achieves all but scattering the dots, so how do I do that?
var i=0;
var inhtml="."
var num=10
function exe(){
i=Math.floor(Math.random()*100)
//alert(i)
while (i<=100){
document.getElementById("dot").innerHTML = inhtml + "."
inhtml = document.getElementById("dot").innerHTML
if (inhtml.length>num){
inhtml=document.getElementById("dot").innerHTML+"<br />"
num=num+20
}
i++;
}
}
Instead of using a single element containing several periods at a large size, I'd recommend using separate elements for each dot. Then, (besides not having to use 200px periods), you can use CSS to position each element however you want. I have an example here.
Edit: I don't know what the exact problem with getting the dots to not overlap you're having is, but you basically need to do this:
First you pick a position. Then, you check that position against all the other positions (which you'd probably want to do using Manhattan distance). If the point is valid, you use that point and add it to the array of taken positions. Otherwise, go back to the first step.
You may want to check your syntax errors before progressing; I do not know whether you copied all of your code, but you are missing semicolons at the end of your lines. Syntactical issues aside, one possible way to achieve what you describe would be to assign the x- and y-coordinate of each point to a random number. Examination of the code reveals that only the initial value of i is assigned to the value of random(). Incrementing i will make the coordinates of future points dependent on the initial value of i, which is something you may want to take into account. But nowhere in your code do I see you changing the position of the each element based on the values you generate.
I strongly suggest that you use the HTML5 Canvas instead of attempting to move HTML elements; the latter would be cumbersome and lead to messy and inefficient code. If you still want to stick to the method you are trying to use now, check to make sure that the CSS display property is set to block for these elements. You are using the getElementById() method, which is not very useful in this circumstance, since IDs are unique in HTML files. I would suggest using getElementsByTagName() and using those returned elements with a specific class attribute instead.
You might want to look at the HTML 5 Canvas. It allows you draw arcs (aka circles) In any postion, size, and fill color.
Look here for details, here for a tutorial, and here for a demo.
To not be bound by the browser's text layout constraints, you pretty much have to absolutely position your dots:
<div style="position: absolute; top: {random number}; left: {random number}">.</div>

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