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// JavaScript Document /* If you want to use this script, please keep the original author in this header! Purpose: Script for applying maxlengths to textareas and monitoring their character lengths. Author: James O'Cull Date: 08/14/08 To use, simply apply a maxlenth value to a textarea. If you need it to prevent typing past a certain point, add lengthcut="true" Example: <textarea maxlength="1000" lengthcut="true"></textarea> If you add a new text area with javascript, simply call parseCharCounts() again find the new textarea(s) and label them! */ var LabelCounter = 0; function parseCharCounts() { //Get Everything... var elements = document.getElementsByTagName('textarea'); var element = null; var maxlength = 9; var newlabel = null; for(var i=0; i < elements.length; i++) { element = elements[i]; if(element.getAttribute('maxlength') != null && element.getAttribute('limiterid') == null) { maxlength = element.getAttribute('maxlength'); //Create new label newlabel = document.createElement('label'); newlabel.id = 'limitlbl_' + LabelCounter; newlabel.style.color = 'red'; newlabel.style.display = 'block'; //Make it block so it sits nicely. newlabel.innerHTML = "Updating..."; //Attach limiter to our textarea element.setAttribute('limiterid', newlabel.id); element.onkeyup = function(){ displayCharCounts(this); }; //Append element element.parentNode.insertBefore(newlabel, element); //Force the update now! displayCharCounts(element); } //Push up the number LabelCounter++; } } function displayCharCounts(element) { var limitLabel = document.getElementById(element.getAttribute('limiterid')); var maxlength = element.getAttribute('maxlength'); var enforceLength = false; if(element.getAttribute('lengthcut') != null && element.getAttribute('lengthcut').toLowerCase() == 'true') { enforceLength = true; } //Replace \r\n with \n then replace \n with \r\n //Can't replace \n with \r\n directly because \r\n will be come \r\r\n //We do this because different browsers and servers handle new lines differently. //Internet Explorer and Opera say a new line is \r\n //Firefox and Safari say a new line is just a \n //ASP.NET seems to convert any plain \n characters to \r\n, which leads to counting issues var value = element.value.replace(/\u000d\u000a/g,'\u000a').replace(/\u000a/g,'\u000d\u000a'); var currentLength = value.length; var remaining = 0; if(maxlength == null || limitLabel == null) { return false; } remaining = maxlength - currentLength; if(remaining >= 0) { limitLabel.style.color = 'green'; limitLabel.innerHTML = remaining + ' character'; if(remaining != 1) limitLabel.innerHTML += 's'; limitLabel.innerHTML += ' remaining'; } else { if (enforceLength == true) { value = value.substring(0, maxlength); element.value = value; element.setSelectionRange(maxlength, maxlength); limitLabel.style.color = 'green'; limitLabel.innerHTML = '0 characters remaining'; } else { //My modifications if (currentLength >= 480) { value = value.substring(0, 480); element.value = value; element.setSelectionRange(480, 480); } else { byto = Math.floor(currentLength / maxlength); byto3 = Math.ceil(currentLength / maxlength); byto2 = currentLength % maxlength; //Non-negative remaining = Math.abs(remaining); limitLabel.style.color = 'green'; limitLabel.innerHTML = byto + ' SMS plus ' + byto2 + ' character(s) = ' + byto3 + ' SMS<br>' + 'Over 1 SMS by ' + remaining + ' character'; if (remaining != 1) limitLabel.innerHTML += 's'; limitLabel.innerHTML += '!'; } } } } //Go find our textareas with maxlengths and handle them when we load! parseCharCounts();
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