Typewriter effect in html Canvas with a dynamic text box

[richiebeno]

I want a create a typewriter text animation on effect like this https://typeitjs.com/  in canvas.

I have been searching online for a long time and just can't find an answer... if anyone has an idea I would love to hear from you!

[kglad]

use a loop (eg, setInterval or tick) to sequentially add letters.  eg,

var s = 'this is your text';

var F = f.bind(this);

this.addEventListener("tick", F);

function f(e){

if(this.tf.text.length<s.length){

this.tf.text+=s.charAt(this.tf.text.length);

} else {

this.removeEventListener('tick',F);

}

}

[richiebeno]

works... great. Is they a way to set the interval time?

[kglad · Accepted solution]

use the ticker's framerate or interval. eg,

createjs.Ticker.framerate=10;

(but i suspect that will affect your entire projects framerate).  if that's not a problem, use it or, at least, try it.

if it's a problem, use setItnerval:

var s = 'this is your text';

var F = f.bind(this);

var fI;

clearInterval(fI);

fI=setInterval(F,400);

function f(e){

if(this.tf.text.length<s.length){

this.tf.text+=s.charAt(this.tf.text.length);

} else {

clearInterval(fI);

}

}

[tjlinzy]

Hello kglad, 

Thanks so much for this information.  I am not good at coding, however, I was able to incorporate this into my Animate file without a problem.  I really appreciate your assistance. 

However, I do have one question.  I tried speeding the typing effect up by changing the createjs.Ticker.framerate=10; as well as the fI=setInterval(F,400);

Will you please tell me how to speed up the effect?  I spent a lot of time trying to figure it out for myself, but I just can't.   I will be extremely grateful for your patience and assistance. 

Sincerely, 

Terri

[tjlinzy]

Hello kglad, 

I was able to use your code and it worked perfectly for me.  Thanks so much.  I did have a question about speeding up the typing speed so I reached out to you and another Adobe Community Professional that complimented your work, JoaoCesar, hoping to get a quick response from either one of you because of my time constraints.

JoaoCesar suggested that I reduce the setInterval and I did.  I changed it from 400 to 100 and it was the perfect speed for what I wanted to do. 

I thank you both very much for your expertise and generosity.  I appreciate all that you all contribute. 

[SE_Tamura]

Hello! I have encountered an error in the codes you inputed.

The error indicates that this var F = f.bind(this); was the issue.

I'm using ActionScript 3.0

Looking forward to your response

Thank you!

[SE_Tamura]

cont.

This is the error message
Scene 1, Layer 'TEXTBOX', Frame 1, Line 3, Column 11 1061: Call to a possibly undefined method bind through a reference with static type Function.

[kglad]

@SE_Tamura 

this thread is about html5/canvas where that line (and others in my message) is (are) correct.  

[SE_Tamura]

Is it possible to do this in ActionScript 3.0?

[SE_Tamura]

Like is there a code like this for Actionscript 3.0?

[kglad]

yes, as3 for this is about the same.

[SE_Tamura]

I copy-pasted your codes and this error appeared when I previewed it, as I mentioned previously. And when I right clicked on the said error, below is the highlighted source of problem.

[SE_Tamura]

This is what it looked like with your codes.

[kglad]

it's about the same, but not exactly the same.

as3:

var s = 'this is your text';

var f_int:int;

clearInterval(f_int);

f_int=setInterval(f,400);

function f(){

if(tf.text.length<s.length){

tf.text+=s.charAt(tf.text.length);

} else {

clearInterval(f_int);

}

}

[SE_Tamura]

Hi, thank you for responding!
I gave the codes you sent just now a try, however these errors appeared...

This is what it looked like.

[kglad]

you need a dynamic textfield in stage with instance name tf

[ClayUUID]

A little something I whipped up:

// Method added to CreateJS Text object to add text one character at a time

// Arguments:

//  text: text to add

//  cps: characters per second (optional; default 12)

//  clear: clear current contents of textfield (optional; default false)

//  callback: function to call when done (optional)

cjs.Text.prototype.type = function(text, cps, clear, callback) {

    if (clear) {

        this.text = "";

    }

    if (this.typeData) {

        clearInterval(this.typeData.timer);

    }

    this.typeData = {text: text, callback: callback, chars: 0};

    this.typeData.timer = setInterval(function() {

        var td = this.typeData;

        this.text += td.text.charAt(td.chars);

        if (td.chars++ === td.text.length - 1) {

            clearInterval(td.timer);

            if (td.callback) {

                td.callback.call(this);

            }

        }

    }.bind(this), 1000 / (cps ? cps : 12));

}

Just stick the above code anywhere in your setup/initialization frame, then use as, for example:

this.test.type("This is a test.");

Or:

this.test.type("This is another test.", 24, false, doSomethingWhenDone);

Note that if you specify a character rate higher than the stage's frame rate, you'll see multiple consecutive characters appear at once.

[JoãoCésar]

Excellent.

I'll save this one.

And maybe a good addition would be to get the current text field's text if the user doesn't provide any. So it would only be a matter of calling this.textField.type();

Regards,

JC

[ClayUUID]

It could also use some input validation. Currently if you pass it a null string it will go into an infinite loop.

[tjlinzy]

Hell Joao, 

Would you happen to know how to speed the typing effect up.  I've tried everything, but it will not work for me.  

Thanks much in advance. 

Terri

[ClayUUID]

Why are you asking everyone except the person who actually wrote this how to speed it up?

You control the speed by passing it the desired characters-per-second argument. That's clearly documented right on the fourth line of the code.

[tjlinzy]

Sir...it seems as if I've insulted you based upon your response.  I apologize.  It was not my intention.  I do however, think that there is a misunderstanding here.  I used the coding: 

This seems quite different from the coding under your name.  It was my understanding that KGlad wrote this.  That is why I addressed my question to him. I took a chance of changing the framerate hoping that it would fix the problem, but it did not. 

However, since you responded, I will use the coding you provided and hopefully I will get the end result that I need. 

Thank you.  

[monckey100]

You made this in 2019 and I just want to say thanks!

[tjlinzy]

Hello kglad, 

Sorry, I posted this question in the wrong place.  Thanks so much for this information.  I am not good at coding, however, I was able to incorporate this into my Animate file without a problem.  I really appreciate your assistance. 

However, I do have one question.  I tried speeding the typing effect up by changing the }.bind(this), 1000 / (cps ? cps : 12)); as well as the framerate in my document. 

Will you please tell me how to speed up the effect?  I spent a lot of time trying to figure it out for myself, but I just can't.   I will be extremely grateful for your patience and assistance. 

Sincerely, 

Terri