I have a HighStock chart that renders data for the previous 24hrs, from that data I first want to show only the last 2hrs and allow the users to drag it back if they want to see more.
Is it possible to get the min and max values of the section a user selected?
I tried getExtremes, but this gives me the complete 24hrs.
If I understand you correctly, you want to know what are the minimum and maximum datetimes of the currently visible points (that is, the range the user specified in the navigator or in the range selector). If that is the case, just get the min and max values of the xAxis in question.
The result of the getExtremes() function looks something like this:
Object {
dataMax: 1374169422743,
dataMin: 1374169326060,
max: 1374169381963.2844,
min: 1374169379331.4294,
userMax: 1374169381963.2844,
userMin: 1374169379331.4294
}
From what I can tell, the min/max set will match the userMin/userMax set and will also match what you get directly from the xAxis in question. I'm not sure which is the better source
You neet to use setExtremes() http://api.highcharts.com/highstock#Axis.setExtremes() function which allows to degine this range.
Related
I have a live graph that updates every x time. Included below is an image using a dummy variable. What I would like is for Highcharts to only label the first, middle, and last. Or anything to where I don't spam my graph label with ticks.
Presently my xAxis looks like so:
xAxis: {
crosshair: true,
type: "categories",
categories: xaxis
},
Nothing out of the ordinary. I have tried adding a tickInterval, however, that does not really solve the issue over the long run. Essentially what I need is the opposite of a tickInterval, where ticks are removed after a certain interval. Not unlike the datetime API that highcharts currently has. The difference here is that this data cannot be generated by myself, but by an API that I am using, which spits out the as-shown x-axis label.
After a while, in case there is too much xAxis labels displayed on a chart, the number of them is automatically reduced (the first example). Although, if you want, you can use couple of solutions. The best way, would be to use tickPositioner to display only the first, the middle and the last labels and format them using Highcharts.dateFormat inside xAxis.labels.formatter (the second example). You could also set bigger step of xAxis.labels (the third example).
API Reference:
http://api.highcharts.com/highcharts/xAxis.tickPositioner
http://api.highcharts.com/highcharts/Highcharts.dateFormat
http://api.highcharts.com/highcharts/xAxis.labels.step
Example:
http://jsfiddle.net/vxjdwer7/ - default behaviour
http://jsfiddle.net/30t45zvq/ - using tickPositioner
http://jsfiddle.net/6g9uvokL/ - using step
We have a request from customer and we need to trick the highcharts bar view.
The problem is our series contain timestamp vs value but business wise this value is corresponding to previous timestamp to that value's timestamp. So we would like to show the bars in between of these timestamps.
So is there an easy way to do this in highcharts w/o playing with the points in the series.
See images below;
Current Highchart Behaviour
Requested Chart Behaviour
You can use xAxis.tickPositioner in order to move ticks and xAxis.labels.formatter to change labels values.
Live example: https://jsfiddle.net/h9zjmqap/
Output:
I'm using the ios-charts library and I have a LineChart View that has x values that are dates from every weekday of this year. On the y-axis I have values between 0 and 25.
I would like to zoom in on different intervals on the LineChart View.
For example only show Data for week X one time and later change to show data for three months, etc etc.
I did not find anything in the documentation on how to do this. I used the "zoom" function with out any success.
(Example : Zoom and show the last 20 days on the x axis or zoom and show the last three months)
Has someone does this before?
It's a tough question and very advanced control. I guess you need to read carefully about the code, focusing on moveViewToX, and the logic and functions in ChartTransformer. Combining some tricks and calculations, you may find a way to fine-grainedly controll what you want to display.
Also, there is a property:
/// the maximum number of entried to which values will be drawn
internal var _maxVisibleValueCount = 100
may also help you.
I have some data that can have values in the range (0..100). Highcharts will sometimes label the axis from -10 to 110, which looks odd.
How can I prevent this? I can set a fixed min and max value for the axis, but if the current values happen to be between e.g. (50..60), I'd rather let Highcharts zoom in on the axis accordingly. Just don't want Highcharts to ever show anything outside of (0..100).
I could of course determine the appropriate min and max values myself every time I load data, but was hoping there would be some kind of minMin and maxMax setting?
So it looks like this isn't possible; opened a feature request.
Nowadays highcharts has floor and ceiling options for this use case.
I have a situation where I need to remove all margins from a highchart and remove the x/y axis so it fills a series of columns in a table completely.
I did that, no problem. Chart goes to the extremes as needed.
What I need now is that pesky yaxis I already removed...but displayed in a table cell outside of the existing highcharts object.
It would seem easy, as though I could just set the overflow property of yaxis to 'visible' and play with the offset...which would work however this would only work if I wanted to re-position the axis within the boundaries of the highchart object. I want him in a different cell entirely.
Is there anyone who has had experience in this situation? Is it going to require me to have a secondary highchart with only a y-axis?
Best answer gets a green check.
EDIT :: I now have dispersed each 'day' into their own column (more bars coming per day [scheduled,actual,etc...]). In order to keep the scales lined up, I manipulate the yAxis:max property and set them all to a derived value.
In the open column (currently w/ text Hourly Trends) is where I would put an additional highchart module with no series data but with the same min/max/tickInterval.
The next big leap will be to see the data is alive and changes w/ schedule. May have to start another thread for that one, no?
Create a new HC object with no data but only the yAxis (making sure it is the right scale, etc). Perhaps add the same series of data to it but hide the series? Add it to the location you want. This seems kludge and not very good practice. Each business use is different but why would you want this?
EDIT based on comment of business rules:
Why not come at this from a different direction and have the individual chart elements (the bars/points/etc) be a single point chart. This way you have one chart per column. You can then set up the yAxis to be text and not worry about the position. If we could see an example of the page layout and the desired result that would help.