Renjin R package to create html
This package provides a simple way to create html content. Here is an example:
library('se.alipsa:htmlcreator')
html.new("<html><body>")
html.add("<h2>A Sample report with a table and an image</h2>")
html.addPlot(
{
plot(mtcars$mpg ~ mtcars$hp, pch=23, col="orange", bg="orange", cex=1.5, lwd=2)
abline(h = mean(mtcars$mpg), col="green")
},
width=300,
height=400,
htmlattr=list(alt="mtcars mpg ~ hp", id="plot1")
)
html.add(mtcars)
html.add("</html></body>")
# save the html to a file
outFile <- tempfile("plot", fileext = ".html")
write(html.content(), outFile)
print(paste("Wrote", outFile))To be able to do this, add the dependency to your pom.xml as follows:
<dependency>
<groupId>se.alipsa</groupId>
<artifactId>htmlcreator</artifactId>
<version>1.4.1</version>
</dependency>As you can see, the main method is the overloaded html.add. It can take
- strings (charvectors) as parameters (which are treated as raw html),
- a data.frame (which is converted into a html table), or
- a plot function (which converts the plot into an img tag). Notice that the plot function is passed in enclosed
with
{ }, this to allow the plot function to be executed by the html.addPlot method (which converts the result of the plot to an image and base64 encodes it into a string which is then made part of the img tag) rather than executed before the function is called.
In addition to html.add(x,...) and html.addPlot(x, ...), there is the html.clear() function which resets the
underlying html object (clears the content). The html.new(x, ...) is an alias for html.clear()
followed by html.add(x,...) and is a good way to start the script
(especially if you run multiple scripts in the same session).
html attributes can be set by setting the parameter htmlattr to a list of attribute, e.g:
# add id and class to a table:
html.add(mtcars, htmlattr=list(id="cardetails", class="table table-striped"))
# add alt attribute to an img:
html.addPlot({
plot(
cars,
main="Cars speed and dist",
col=c("darkblue")
)
abline(h = mean(cars$dist), col="red")
abline(v = mean(cars$speed), col="red")
},
htmlattr = list(alt="a cars plot")
)It is also possible to use the underlying reference class (Html) and the specific html creating methods directly. The underlying html creating methods are:
- html.table - converts a data.frame to a table
- html.imgPlot - converts a plot to an img tag
- html.imgPlotComplex - converts a series of plot commands enclosed with
{ }to an img tag - html.imgFile - converts a file to an img tag
- html.imgUrl - creates an img tag
- upgrade maven enforcer plugin
- Add addPlot function for better plotting capabilities
- Make sure get content is enclosed in
<html> </html>
- add html.new(...) as an alias for html.clear() followed by html.add(...)
- fix broken tests
- use a dedicated env to avoid accidental overwrites
- Remove space in base 64 file encoding (no space works in all browsers whereas the space caused problems in (at least) Firefox)
- Fixes to img handling, rename internal functions for clarity
- bugfix for matrix's
- add ability to add element attributes (e.g class, id etc)
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