How to dynamically create '@-Keyframe' CSS animations?

You can insert stylesheet rules dynamically to override previous styles in the head. This helps avoid adding yet another library for a single task.

var style = document.createElement('style');
style.type = 'text/css';
var keyFrames = '\
@-webkit-keyframes spinIt {\
    100% {\
        -webkit-transform: rotate(A_DYNAMIC_VALUE);\
    }\
}\
@-moz-keyframes spinIt {\
    100% {\
        -webkit-transform: rotate(A_DYNAMIC_VALUE);\
    }\
}';
style.innerHTML = keyFrames.replace(/A_DYNAMIC_VALUE/g, "180deg");
document.getElementsByTagName('head')[0].appendChild(style);

well i don't think it is easy to create dynamic @keyframes they are inflexible because they must be hard-coded.

Transitions are a little easier to work with, as they can gracefully respond to any CSS changes performed by JavaScript.

However, the complexity that CSS transitions can give you is pretty limited — an animation with multiple steps is difficult to achieve.

This is a problem that CSS @keyframe animations are meant to solve, but they don’t offer the level of dynamic responsiveness that transitions do.

but these links might help you

Link1 : a tool that generates a @-webkit-keyframe animation with many tiny steps. This opens the door to an unlimited selection of easing formula.

Link2 it will be a great help for you to take it as a base as it provides a UI to create animations and exports it to CSS code.

I guess this solution will definitely work for you. Its is used for dynamic keyframes