Get Output only when blocks are connected

[AAGAM JAIN]

I have created a statement input and a dropdown and I want to display answers only when the two statements are connected in the workspace. Here is my code: 

Blockly.Blocks['bot'] = {

  init: function() {

    this.appendStatementInput("BOT")

        .setCheck(null)

        .appendField("bot");

    this.setColour(225);

    this.setTooltip("");

    this.setHelpUrl("");

  }

};

var code="";

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

  var statements_bot = Blockly.JavaScript.statementToCode(block, 'BOT');

  return code;

};

Blockly.Blocks['dropdown'] = {

  init: function() {

    this.appendValueInput("dropdown_ques")

      .appendField("Ask me a Question: ")

      .appendField(new Blockly.FieldDropdown([["select", "select"], ["What is the date today?", "date"], ["What is the time now?", "time"], ["How are you?", "howru"], ["What is Javascript?", "javascript"], ["What is your name?", "yourname"]]), "Questions");

    this.setInputsInline(false);

    this.setPreviousStatement(true, null);

    this.setColour(300);

    this.setTooltip("");

    this.setHelpUrl("");

  }

};

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

  var question = block.getFieldValue('Questions');

  // If Question is not selected

  var ques = "Please select a question";

  // Question 1 answer

  var today = new Date();

  var dd = String(today.getDate()).padStart(2, '0');

  var mm = String(today.getMonth() + 1).padStart(2, '0'); 

  var yyyy = today.getFullYear();

  var dateToday = dd + '/' + mm + '/' + yyyy;

  

  // Question 2 answer

  var hh = String(today.getHours()).padStart(2,'0');

  var mi = String(today.getMinutes()).padStart(2,'0');

  var ss = String(today.getSeconds()).padStart(2,'0');

  var timeToday = hh + ':' + mi + ':' + ss;

  // Question 3 answer

  var how = "I am fine.";

  // Question 4 answer

  var js = "JavaScript is the Programming Language for the Web.";

  // Question 5 answer

  var myName = "My name is Aagam Jain."

  

  if (question === "select") {

    code = `var inputTextValue ="${ques}";`;

  }

  else if (question === "date") {

    code = `var inputTextValue = "${dateToday}";`;

  }

  else if (question === "time") {

    code = `var inputTextValue = "${timeToday}";`;

  }

  else if (question === "howru") {

    code = `var inputTextValue = "${how}";`;

  }

  else if (question === "javascript") {

    code = `var inputTextValue = "${js}";`;

  }

  else if (question === "yourname") {

    code = `var inputTextValue = "${myName}";`;

  }

  return code;

};

[Beka Westberg]

Hello,

Your block-code generators look a little bit different from what I'm used to, so forgive me if I misunderstand anything hehe. Are you putting your 'dropdown' blocks inside of your 'bot' block, and then you want to generate "code" that contains the answers?  I think that usually you would generate code that finds the answers instead of encoding them directly. Eg:

```

Blockly.JavaScript['dropdown'] = function (block) {
  var question = block.getFieldValue('Questions');

  return 'alert(getAnswer(' + question + ');\n';
};

```

So I just want to make sure I'm understanding!

Now I think that if you want to check if the blocks are connected, your best bet is to programmatically check if the statement input of your 'bot' block has a target block. For example:

```

var bot = myWorkspace.getBlocksByType('bot')[0];

var target = bot.getInputTargetBlock('BOT');

if (target) {  // there is a block connected (presumably a question)

  // generate code.

}

```

I hope that helps! If you have any further questions, please reply!

--Beka

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[AAGAM JAIN]

Thank you so much. It's working but I didn't understand the working of the return statement you mentioned above. If you could explain? 

[AAGAM JAIN]

Should I also change the return statement of the bot as if only the bot is present it is showing the answer to the previous question selected? I want it to work both ways i.e. it should work if and only if they are connected or else it should not work.

On Sunday, May 16, 2021 at 12:34:02 AM UTC+5:30 bekawe...@gmail.com wrote:

[Beka Westberg]

Hello,

So generally blockly generates code strings which are then run using some sort of interpreter.

For example, if you have a group of blocks like this:

It would generate the code string "2 + 2". It would not generate 4 or "4".

It seems like your current setup is trying to do more of the second thing, where the logic lives in the generator. There's nothing wrong with doing it this way =) It's just a bit different from how people normally use Blockly hehe. So I wanted to make sure I understood what you were trying to say.

Does that answer your question? Or did I miss the mark again? hehe

Best wishes,

--Beka

To view this discussion on the web visit https://groups.google.com/d/msgid/blockly/d65b3d03-c1b6-48fe-ae7b-31051d7557a0n%40googlegroups.com.