Hiding dropdown fields in a variable (Rename Var, Create new Var)

[Sandeep Nimmagadda]

Hi,

Can someone show me how to hide dropdown options when selecting a variable such as Rename variable, create new variable.

Thank you!

[Wolfgang Koehler]

https://developers.google.com/blockly/guides/create-custom-blocks/dropdown-menushttps://developers.google.com/blockly/guides/create-custom-blocks/dropdown-menus

[Anthony Morphett]

Hi Sandeep

The variable menu is created in Blockly.FieldVariable.dropdownCreate, see field_variable.js line 127 . To remove the 'new variable' or 'rename variable' you will have to modify Blockly.FieldVariable.dropdownCreate. Try something like the following, it should work anywhere in your main .js file.

Blockly.FieldVariable.dropdownCreate = function () {
  if (this.sourceBlock_ && this.sourceBlock_.workspace) {
    var variableList =
        Blockly.Variables.allVariables(this.sourceBlock_.workspace);
  } else {
    var variableList = [];
  }
  // Ensure that the currently selected variable is an option.
  var name = this.getText();
  if (name && variableList.indexOf(name) == -1) {
    variableList.push(name);
  }
  variableList.sort(goog.string.caseInsensitiveCompare);

/* Next two lines add the 'New variable' and 'Rename variable' options so we comment them out */

//  variableList.push(Blockly.Msg.RENAME_VARIABLE);
//  variableList.push(Blockly.Msg.NEW_VARIABLE);

  // Variables are not language-specific, use the name as both the user-facing
  // text and the internal representation.
  var options = [];
  for (var x = 0; x < variableList.length; x++) {
    options[x] = [variableList[x], variableList[x]];
  }
  return options;
};

Regards,

Anthony

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[Sandeep Nimmagadda]

Hi Anthony,

I tried doing this, but I'm still getting the options. I know logically I shouldn't be getting these options since i commented them out. Do you know why is this not working?

Thank you!

[Neil Fraser]

Just a quick check that you are aware of the compile cycle needed when editing the core directory.
First check tests/playground.html to see if your changes are taking effect since the playground uses the uncompressed code.  If they look good there, then recompile with 'build.py' to generate the compressed JS files.

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Neil Fraser
https://neil.fraser.name