如何在字符串中编写javascript函数

Question

I'm trying to run a JavaScript function in R. One part of the code requires me to pass a JavaScript function containing a filename as a string. Because the string contains a file path this leads to all hell breaking loose with single and double quotes and backslashes. Here is what I have

d3chart$chart(tooltipContent = "#! function(item, x, y, e,z){ 
   return '' + '<img src=\"/Users/cBl.png\"' + '/>'
          } !#")
d3chart

The result should be that I can see an image in a tooltip on a chart. The whole thing runs without error, but on the chart I get a question mark instead of the image which I guess means it cant follow the filename path. I think this is because I'm not sure how to write this filepath string properly to call the img src part.

Answer 1

I guess its the line break that causing the whole string to be syntax error, also I would remove the return ''+ it has no meaning I added the full path to the file location so you will be able to debug in order to get better understanding if that a wrong file location issue

you can add \\n\\ to end of line:

d3chart$chart(tooltipContent = "#! function(item, x, y, e,z){ \n\
   return '<img src=\"'+document.location.hostname+'/'+document.location.pathname+'/Users/cBl.png\"' + '/>'\n\
          } !#")
d3chart

Answer 2

有点难以确切地知道你的目标是什么，因为javascript有点乱，但这应该工作：

d3chart$chart(tooltipContent = "#! function(item, x, y, e,z) { return '<img src=\'/Users/cBl.png\' />' } !#")