MediaWiki:CharCount.js

$( function ()  {
	var myPlace = document.getElementById('CharCount');
function getID(id) {
	return document.getElementById(id);
}

function addNumericOptions(id, min, max, defIndex) {
	var s = getID(id);
	for (ii=min; ii<=max; ii++) {
		var option =  document.createElement("option");
		option.text = ii;
		option.value = ii;
		s.add(option);
	}
s.value = defIndex;
}
function getMaxChars() {
	var maxChar = getID('chars');
	return maxChar.value;
}

function getLinkDiscount() {
	checkDiscount = getID('linkAbbreviate');
	if (!checkDiscount.checked) return 0;

	input = getID('text');
	sub = getID('linkChars');
	let text = "" + input.value.length;
	text = text.replaceAll('\\n', ' ');
	text = text.replaceAll('\\t', ' ');
	var subLength = sub.value;
	var discount = 0;
	const parts = input.value.split(" ");
	for (ii=0; ii<parts.length; ii++) {
		part = parts[ii];
		l1 = part.length;
		l2 = part.replaceAll('http','').length;
		if (l1>l2) {
			l1 = part.length;
			discount+= l1-subLength;
		}
	}
	return discount;
}

function updateParamValues() {
	var c = getParamValue('c');
	lengthChoice = getID('chars');
	lengthChoice.value = c;
	var l = getParamValue('l');
	la = getID('linkAbbreviate');
	if (l!=null) {
		linkChoice = getID('linkChars');
		linkChoice.value = l;
		la.checked = true;
	} else {
		la.checked = false;
	}
	var text = getID('text');
	text.rows = c/25;
}

function getParamValue(name) {
	var url = window.location.href;
	l1 = url.length;
	l2 = url.replaceAll('?','').length;
	if (l1==l2) {
		return null;
	}
	const params = url.split('?')[1]; // the params, hopefully
	const paramValues = params.split('&');
	for (ii=0; ii<paramValues.length; ii++) {
		paramValue = paramValues[ii];
		//alert(paramValue);
		paramName = paramValue.split('=')[0];
		if (paramName==name) {
			return paramValue.split('=')[1];
		}
	}
	return null;
}

function updateOutput() {
	ld = getLinkDiscount();
	cc = getCharacterCount();
	ccd = cc-ld;
	max = getMaxChars();
	rmn = max-ccd;

	var warningLevel = getID('warningLevel');
	warningLevel.style.background = "rgb(0,255,0)";
	if (rmn<10) {
		warningLevel.style.background = "rgb(255,255,0)";
	}
	if (rmn<0) {
		warningLevel.style.background = "rgb(255,0,0)";
	}
	var v = "This content uses " + ccd + " characters of " +
		getMaxChars() +	" allowed.  " +
		rmn + " characters to spare.";
	var o = getID('outputCount');
	o.value = v;
}

function getCharacterCount() {
	input = getID('text');
	return input.value.length;
}

function setup() {
	addNumericOptions('chars', 40, 1000, 280);
	addNumericOptions('linkChars', 0, 100, 13);
	updateParamValues();
	updateOutput();
}

});