field.getSourceBlock throws exception

[Koen Van Wijk]

Hi,

With the 9 release field.getSourceBlock throws exception instead of returning a null if the source block is not connected yet.

My code look somewhat like:

Blockly.Blocks['generate_list_length'] = {

  init: function() {

    this.appendDummyInput()

        .appendField("Length of")

        .appendField(new Blockly.FieldDropdown(function() {

                  ....

                  var source_block = this.getSourceBlock()

                   if (source_block) {

                   }

So I call the getSourceBlock in the dynamic options functions. However this dynamic option function seems to be already called before the SourceBlock is connected. Now I have to make a ugly code like:

try {

  var source_block = this.getSourceBlock()

} catch (e) {

  var source_block = null;

}

Is this on purpose, did I miss something?

Regards,

Koen  

[Aaron Dodson]

Hi,

This was intentional, but the usecase you're describing makes sense, so we're planning to revert this change in an upcoming patch release. Thanks for reporting this!

- Aaron