Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Javascript typing effect

Tags:

javascript

The issue arises from the same issue as last time. My websites run off a static domain, so I want to be able to use this script on each site without making duplicate copies.

It functions as a typing text effect, I want to be able to define the text it prints out from the webpage itself and not the script.

Javascript

var index = 0;
var text = 'Text';

function type()
{
    document.getElementById('screen').innerHTML += text.charAt(index);
    index += 1;
    var t = setTimeout('type()',100);
}

I've tried fiddling with the code and using them same method as my previous post, but I can't seem to get it to work.

like image 245
JakeGriffin Avatar asked Nov 11 '13 17:11

JakeGriffin


3 Answers

Okay, I don't like any of the above code. Your original code also doesn't stop running once it reaches the end of the input text, and I don't believe any of the other suggested solutions stop either.

Here's a rewritten function in pure JS:

function type(i, t, ie, oe) {
    input = document.getElementById(ie).innerHTML;
    document.getElementById(oe).innerHTML += input.charAt(i);
    setTimeout(function(){
        ((i < input.length - 1) ? type(i+1, t, ie, oe) : false);
    }, t);
}

Which you can call like so:

type(0, 100, "text", "screen");

The parameters are: beginning index, speed, input element, output element

Your HTML will look something like this:

<div id="screen"></div>
<div id="text" style="display:none">Hello Bobby</div>

You can rename the divs to whatever you like, as long as you update the parameters accordingly. I'm sure there's an easier way to write this as well, but I like this method the most.


Demo

function type(i, t, ie, oe) {
    input = document.getElementById(ie).innerHTML;
    document.getElementById(oe).innerHTML += input.charAt(i);
    setTimeout(function(){
        ((i < input.length - 1) ? type(i+1, t, ie, oe) : false);
    }, t);
}

type(0, 100, "text", "screen");
<div id="screen"></div>
<div id="text" style="display:none">Hello Bobby</div>
like image 187
Charlie Avatar answered Oct 17 '22 07:10

Charlie


Nice question, LMGTFY has often given me a giggle in the past. I think you may find the following to be pretty easy to throw around anywhere. It's just a few attributes added to your target container, along with a call to get the typewriter started.

Here, I run 4 of them simultaneously just for kicks. It's probably worth junking forEachNode in this example, instead using the few commented lines. If the result of getElementsByClassName was a true array, you could just call the .forEach method that arrays have. Unfortunately, a nodeList is similar but not the same - hence the need for such a function. I used it before realizing it probably clearer to do without it. In any case, it's a function I've found handy many times. I'll leave that in there as a thanks for such a fun question to consider.

function forEachNode(nodeList, func) {
  var i, n = nodeList.length;
  for (i = 0; i < n; i++) {
    func(nodeList[i], i, nodeList);
  }
}

window.addEventListener('load', mInit, false);

function typeWriter(el) {
  var myDelay = el.getAttribute('keyDelay');

  if (el.getAttribute('curIndex') == undefined)
    el.setAttribute('curIndex', 0);

  var curIndex = el.getAttribute('curIndex');
  var curStr = el.getAttribute('typewriterdata');
  el.innerHTML += curStr.charAt(curIndex);
  curIndex++;
  el.setAttribute('curIndex', curIndex);

  if (curIndex < curStr.length)
    setTimeout(callback, myDelay);
  else {
    if (el.getAttribute('nextline') != undefined) {
      var nextTgt = el.getAttribute('nextline');
      typeWriter(document.getElementById(nextTgt));
    }
  }

  function callback() {
    typeWriter(el);
  }
}

function mInit() {
  typeWriter(document.getElementById('line1'));

  var i, n, elementList;
  elementList = document.getElementsByClassName('autoType');
  forEachNode(elementList, typeWriter);
  //	n = elementList.length;
  //	for (i=0; i<n; i++)
  //		typeWriter( elementList[i] );
}
.multi {
  border: solid 2px #333333;
  width: 400px;
}
<body>
  <div class='autoType' typewriterdata='Enter this string letter by letter' keydelay='300'></div>
  <div class='autoType' typewriterdata='Enter this string letter by letter' keydelay='200'></div>
  <div class='autoType' typewriterdata='This is short but slooooow' keydelay='1000'></div>
  <div class='autoType' typewriterdata='The rain falls mainly on the plain in Spain' keydelay='100'></div>

  <div class='multi'>
    <div id='line1' typewriterdata='This is line 1' keydelay='300' nextline='line2'></div>
    <div id='line2' typewriterdata='This is line 2' keydelay='300' nextline='line3'></div>
    <div id='line3' typewriterdata='This is line 3' keydelay='300' nextline='line4'></div>
    <div id='line4' typewriterdata='This is line 4' keydelay='300'></div>
  </div>
</body>
like image 25
enhzflep Avatar answered Oct 17 '22 07:10

enhzflep


You can embed the text in the webpage itself in a hidden element like this:

HTML

<span id="hiddenText" style="display: none">Text you want to type out.</span>

and then you can get the text from the webpage itself like this:

Javascript

var text = document.getElementById('hiddenText').innerHTML;

Here is the jsfiddle you can see: http://jsfiddle.net/FMq6d/ . This makes minimal changes to your code.

like image 37
Chandranshu Avatar answered Oct 17 '22 05:10

Chandranshu