55 lines
1.9 KiB
JavaScript
55 lines
1.9 KiB
JavaScript
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function genRandomText(length) {
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var text = "";
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var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 .?-!(),\"'";
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for (var i = 0; i < length; i++)
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text += possible.charAt(Math.floor(Math.random() * possible.length));
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return text;
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}
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function genRandomInt(min, max) {
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// inclusive min & max
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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function shiftArrayToRight(arr, places) {
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for (var i = 0; i < places; i++) {
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arr.unshift(arr.pop());
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}
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}
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function textFillsScreen() {
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var root = document.compatMode == 'BackCompat' ? document.body : document.documentElement;
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return root.scrollHeight > root.clientHeight;
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}
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function fillScreenWithWhitespace() {
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var text = document.getElementById("text");
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var charArray = [" "];
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var whitespace = " ";
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while(!textFillsScreen()) {
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text.innerHTML += whitespace;
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charArray.push.apply(charArray, [" ", " ", " ", " ", " ", " ", " ", " ",
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" ", " ", " ", " ", " ", " ", " "]);
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}
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for (var i = 0; i < 26; i++) {
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text.innerHTML += whitespace;
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charArray.push.apply(charArray, [" ", " ", " ", " ", " ", " ", " ", " ",
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" ", " ", " ", " ", " ", " ", " "]);
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}
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return charArray;
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}
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window.onload = function () {
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var textElem = document.getElementById('text');
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var charArray = fillScreenWithWhitespace();
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window.setInterval(function () {
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for (var i = 0; i < genRandomInt(1, 4); i++) {
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charArray[genRandomInt(0, charArray.length - 1)] = genRandomText(1);
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textElem.innerHTML = charArray.join("");
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}
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shiftArrayToRight(charArray, 1);
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}, 25)
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}
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