fxTex Pro Packages

In fxTeX Pro

To render the equations already on a page, name the packages to autoRender():

<script src="https://fxtex.codecogs.com/fx_pk_your-key-here/fxtexpro.min.js"></script>
<script>
  fxTeXPro.ready.then(() => {
    fxTeXPro.unlock('fx_pk_your-key-here');
    fxTeXPro.autoRender({ packages: ['mhchem', 'chemfig', 'physics'] });
  });
</script>Copy

Or, when you render or convert equations yourself, to usePackages(), and wait for it before you do:

await fxTeXPro.ready;
fxTeXPro.unlock('fx_pk_your-key-here');
await fxTeXPro.usePackages(['mhchem', 'chemfig']);
const mathml = fxTeXPro.convertToMathML('\\ce{2H2 + O2 -> 2H2O}');Copy

Each package is fetched from beside fxtexpro.min.js. Name only the ones a page uses: chemfig in particular is far larger than the other two.

In the equation editor

The editor takes the same list, once per page, in EqEditor.init(). The packages are ready, and their commands are in the editor's suggestions, once it resolves:

<script src="https://fxeditor.codecogs.com/fxeditor.api.min.js"></script>
<script>
  const ready = EqEditor.init({
    licence: 'fx_pk_your-key-here',
    packages: ['mhchem', 'chemfig']
  });
</script>Copy

Adding the panels to the toolbar

A toolbar shows the panels it is given, row by row: each inner array is one row. Put a package's panels in among the others you want:

<div id="toolbar"></div>
<div id="mathview"></div>

<script>
  // The toolbar draws its own buttons, so it need not wait for init().
  const toolbar = EqEditor.Toolbar.link('toolbar', [
    ['mhchem', 'mhchem_arrows', 'chemfig', 'chemfig_ext', 'arrows'],
    ['operators_core', 'subsupset', 'brackets', 'greeklower', 'greekupper', 'symbols', 'spaces']
  ]);
  ready.then(() => {
    EqEditor.MathView.link('mathview').addToolbar(toolbar, true);
  });
</script>Copy

Or add a panel to a toolbar that is already built, at the end of a row:

EqEditor.Toolbar.link('toolbar')        // the default toolbar
  .appendPanel(0, 'mhchem')             // to the end of the first row
  .appendPanel(0, 'mhchem_arrows');Copy

A button on the mhchem or chemfig panels writes its piece inside \ce{} or \chemfig{}, adding that command only when the caret is not already in one: press a second button and it extends the formula you are writing rather than starting another.

There is no physics panel among the toolbar's own yet. The physics page has one to copy, passed in a design where a panel's name would go; the same works for a panel of any commands you like — see Extending Toolbar.

Without the package

On a page that has not asked for a package, its commands are not converted: \ce and \pu say that they need mhchem, and chemfig's and physics' commands are unknown, as any other unknown command is. Panels are not tied to packages, so nothing stops a toolbar showing a panel whose package is off — name the package in init() on every page whose toolbar has its panels.

More

mhchem — chemical formulae, equations and units.

chemfig — structural formulae and reaction schemes.

physics — derivatives, vectors, bra-kets and matrices.

Design — choosing and arranging toolbar panels.

Supported commands — every command fxTeX reads, the packages' included.