set value of Blockly.FieldLabel dynamically

[kushal bhattacharya]

hello everyone .I  now want to change the value of  Blockly.FieldLabel whixh is inside a dummy input  i wat to change the value of Blockly.FieldLabel  when i click the second block shown in the image below there  would be a pop up dialod which would show list of program names in the  dropdown list. When i select an option on the dropdown list and click ok the value will  replace the original value of the second block (which is put in Blockly.FieldLabel).

Thank u . 

 i am also posting the code in the next comment 

[kushal bhattacharya]

                Blockly.Blocks['require_file'] = {

                    init: function () {

                        //Require_block=this;

                        this.appendValueInput("Req")

                                .setCheck(null)

                                .appendField("Require");

                        this.setInputsInline(false);

                        this.setColour(65);

                        // this.setTooltip('');

                        //this.setHelpUrl('http://www.example.com/');

                    }

                };

                Require_block = Blockly.Blocks['require_file'];

                Blockly.JavaScript['require_file'] = function (block) {

                    // String or array length.

                    var argument0 = Blockly.JavaScript.valueToCode(block, 'VALUE',

                            Blockly.JavaScript.ORDER_FUNCTION_CALL) || '\'\'';

                    return [argument0 + '.length', Blockly.JavaScript.ORDER_MEMBER];

                };

                Blockly.Blocks['file_name'] = {

                    init: function () {

                        file_block = this;

                        this.appendDummyInput()

                                .appendField("<            >");

                        this.setOutput(true, null);

                        this.setColour(120);

                        this.setTooltip('');

                        this.setHelpUrl('http://www.example.com/');

                    }

                };

                file_block = Blockly.Blocks['file_name'];

                Blockly.JavaScript['file_name'] = function () {

                    var code = '../n';

                    return code;

                }

  var parentBlock = Blockly.Block.obtain(Blockly.getMainWorkspace(), 'require_file');

                parentBlock.initSvg();

                parentBlock.render();

                var childBlock = Blockly.Block.obtain(Blockly.getMainWorkspace(), 'file_name');

                //childBlock.setFieldValue('Hello', 'TEXT');

                childBlock.initSvg();

                childBlock.render();

             console.log(childBlock);

                var parentConnection = parentBlock.getInput('Req').connection;

                var childConnection = childBlock.outputConnection;

                parentConnection.connect(childConnection);

[Wolfgang Koehler]

Use the change event. Something along this line:

function eventHandler(event) {
  if (event.type == Blockly.Events.CHANGE) {
    if (event.name == "BlockName") {   
      var parentBlock = workspace.getBlockById(event.blockId);
      if (parentBlock.type == "type") {
        var childBlock = parentBlock.childBlocks_[n];
        childBlock.setFieldValue('whatever');

[kushal bhattacharya]

but sir how do i trigger Blockly.Events.CHANGE  when click is done on the block click event is triggerd so sir how do we trigger the change event

[kushal bhattacharya]

But sir i have question about my revious post how do i programmatically join  the 2 blocks  not on the workspace but  in the toolbox.The code that u have given joins the the block at runtime on the workspace.

[kushal bhattacharya]

sir the  change event is trigggerd  during initialialisation of the block how do i trigger it again

[kushal bhattacharya]

thanx a lot sir  the problem has been resolved

[Rahul Pandit]

Hi kushal,

can you psst the solution to this problem you were facing.

Thanks