EJS should still support previous verison deprecated GUI elements.
There is a new VectorField3D.
The old version you need to supply E[][][][7]: the last 7 are for x,y,z, Ex,Ey,Ez and length
The new version you need to supply Ex[][][],Ey[][][],Ez[][][],length[][][]
x,y,z are specifiled by xmin,xmax,ymin,ymax,zmin and zmax properties.
Please check out attached file.
new variables: Ex,Ey,Ez and L have been defined!