Error while using workspace.removeBlockById()

[NavpreetDevpuri]

i have a custom block with type a

Blockly.Blocks['a'] = {
        init: function() {
            this.appendValueInput("a1")
                .setCheck(null)
                .appendField(new Blockly.FieldDropdown([["aaa","0"], ["b","1"], ["c","2"]]), "a2");
            this.setColour(130);
            this.setTooltip("");
            this.setHelpUrl("");
        }
    };
    Blockly.JavaScript['a'] = function(block) {
        var dropdown_a2 = block.getFieldValue('a2');
        var value_a1 = Blockly.JavaScript.valueToCode(block, 'a1', Blockly.JavaScript.ORDER_ATOMIC);
        // TODO: Assemble JavaScript into code variable.
        var code = '...;\n';
        return code;
    };

i run workspace.removeBlockById(workspace.getBlocksByType("a")[0].id) in console and it show following error as shown in following gif

It should delete block

[BeksOmega]

Hi! When filing an issue please fill out all of the pre-made sections. That helps people figure out what could be going on =)

Lucky for you someone else had the same problem a few weeks ago =) You want to use block.dispose() (docs) not .removeBlockById. As you can see that function is package.

I hope that helps! If you have any further problems (specifically related to disposing) I think it might be best to redirect your questions to the forums. Thank you :D

[NavpreetDevpuri]

thanks for replying
I want to achive something like "delete a block but don't want this deleted block goes into recyclebin"
thats why i used .removeBlockById

mainly my main motive was to achive something like "update dropdown list of a block programmically"
i was able to do that by simply reinitialize block by Blockly.Blocks['a'] but this creates a problem that the blocks that are inside workspace those blocks just don't update in any way but those blocks that are inside toolbox are updated then i tried to delete those unchanged blocks and try to add new ones it works but then these deleted blocks just appears inside recyclebin.

now i just

1. export xml of blocks
2. clear the workspace
3. reimport blocks from xml
   it works fine it update blocks.

Thats what i want to achive

i think blockly should provide this method in documentation that How can we modify blocks programmically at any time ? because i was searching for a method to do that and i don't found any usefull information and this is a important question.

OR may be include some function to class workspace something like workspace.refresh() that refresh both toolbox and workspace area something similar to workspace.refreshToolboxSelection() that refresh only toolbox

[NavpreetDevpuri]

@BeksOmega i want to know that what is the name of workspace area where we put blocks ? can we say it "workspace area" i think "workspace area" is including both toolbox and area. likewise there is a name for right menu "toolbox".

[samelhusseini]

The trashcan uses Blockly events to determine when to add blocks to its list of blocks.
You can disable events and then call block.dispose(), ie:

Blockly.Events.disable();
block.dispose();
Blockly.Events.enable();

Blockly does support dynamic dropdowns, see:
https://developers.google.com/blockly/guides/create-custom-blocks/fields/built-in-fields/dropdown#dynamic_dropdowns

If you're unsure whether what you've stumbled upon is a bug or if you need advice / have questions about what you're trying to achieve, the Blockly forum is a better place to ask questions.