Fixing “WLJQ is not defined” errors

This may also manifest as errors like:

  • WL.Client is not defined
  • Uncaught TypeError: Cannot read property 'init' of undefined

This is caused by MFP/Worklight failing to correctly munge the main HTML file for your app.

Because of this, two JS files don’t get loaded:

<script src="worklight/wljq.js"></script>
<script src="worklight/worklight.js"></script>

These files define WLJQ and WL.Client. Consequently, if they’re not loaded, your app code (see initOptions.js) won’t work.

Don’t hack those lines in manually – MFP expects to do this itself.

When using the CLI

  1. In a terminal enter:
    mfp stop
    rm -r $TMPDIR/wlBuildResources
    rm -r $TMPDIR/wlPreview
    mfp build
    mfp deploy

When using Eclipse

  1. Quit Eclipse (and thus the MFP preview server)
  2. In a terminal enter:
    rm -r $TMPDIR/wlBuildResources
    rm -r $TMPDIR/wlPreview
  3. Restart Eclipse and the preview server.
  4. Build and deploy.

The above instructions should work for Linux and OSX. On Windows, you may find the wlBuildResources and wlPreview directories in C:\temp, or the directory referred to by the TMP environment variable.