Dynamic changes to message

[Bryan Crotaz]

I have a list of sequential blocks. I want to add the prefix 'Then ' to all but the first event.

I've added a change event handler, and I can successfully detect whether there's a parent. However I can't work out how to neatly change the text.

I've added a field_label, and I've tried two techniques with it.

1. Change the text between '' and 'Then'. This works, but the message is indented when the label is blank - it's adding the space in between %1 and %2.

2. Show/hide the label. This still leaves the extra space in place, but now when I hide then show the label, it renders overlapped with the second field.

What's the correct way to modify the message at run time?

[Ronald Bourret]

Have you tried Input.insertFieldAt()? It seems to work for me. This extension sets a block change listener that adds "Then" to the start of a statement block on any event:

Blockly.Extensions.register('add_then_on_change', function() {

  this.setOnChange(function(changeEvent) {

    if (!this.getParent()) return;

    const input = this.inputList[0];

    input.insertFieldAt(0, 'Then');

    this.setOnChange(() => {}); // Remove listener

  });

});

If this doesn't help, can you show us your code?

Thanks,

Ronald Bourret

Technical Writer (Provided by Synergis)

rbou...@xwf.google.com

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