Removing whitespace in JavaScript strings used for dynamic CSS

 I remove excess whitespace in strings used to create dynamic CSS.


My minimiser, 'UglifyJS', does not remove the excess whitespace. It would be quite difficult.  So, I edit the source file by hand in 'vi' saying:


    s:'[ ][ ]*:' :g


This turns:


    ' @keyframes ppbWingRight' + birdNumber + ' { ' +

    '   0% { ' +

    '     transform: rotate3d(0,1,0,' + wingAngle + 'deg); ' +

    '   } ' +

    '   100% { ' +

    '     transform: rotate3d(0,1,0,-' + wingAngle + 'deg); ' +

    '   } ' +

    ' } ' +


into:

      

    ' @keyframes ppbWingRight' + birdNumber + ' { ' +

    ' 0% { ' +

    ' transform: rotate3d(0,1,0,' + wingAngle + 'deg); ' +

    ' } ' +

    ' 100% { ' +

    ' transform: rotate3d(0,1,0,-' + wingAngle + 'deg); ' +

    ' } ' +

    ' } ' +


I create a 'style' tag, set the 'innerHTML' to the string, and attach the 'style' tag to the 'head' element.


I often start with some 'static' CSS that I found on 'codepen.io', often written by Yusuke Nakaya. Most times, the 'pen' uses a CSS pre-processor. I instead do the random bits in JavaScript. This is so the animation can run several times, 

  and be different each time.


I do my own 'minimising' as well as running 'UglifyJS'.  I shorten object properties and CSS id's and classes.  I also replace constants in the same way as the C pre-processor does. I end up looking through the resulting code and it is then that I see the spaces in the dynamic CSS.


There are more tips at: bbingo.xyz/techtips/




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