Full version: jsB@nk » Form » Validation » Limit Characters and Words Entered
URL: https://www.javascriptbank.com/limit-characters-and-words-entered.html
This JavaScript will allow you to limit the number of words and/or characters entered into a form. Easily customizable. Example script will limit input to either 80 characters or 16 words, whichever comes first.
Full version: jsB@nk » Form » Validation » Limit Characters and Words Entered
URL: https://www.javascriptbank.com/limit-characters-and-words-entered.html
<script>/*Created by: Will Bontrager Web Site: http://willmaster.com/*//* For additional information about this JavaScriptand how to use it, see the "Displaying Number of WordsTyped Into Form Fields" article, linked from the archivesat from http://willmaster.com/possibilities/archives/The above note and the copyright line must remain withthis JavaScript source code. Comments below this pointin the code may be removed if desired.*/// Customizing this JavaScript code requires specifying eight values.// Value One:// Specify the maximum number of characters the form field// may contain. If you have no maximum, specify 0 (zero).var MaximumCharacters = "80";// Value Two:// Specify the maximum number of words the form field may// contain. If you have no maximum, specify 0 (zero).var MaximumWords = "16";// Value Three:// Specify the form's name (provided by the name="_____"// attribute in the FORM tag).var FormName = "myForm";// Value Four:// Specify the name of the text field being monitored// (provided by the name="_____" attribute in the// INPUT or TEXTARE tag).var TextFieldName = "TextField";// Value Five:// Specify the field name where where is to be displayed// the number of characters the user has typed. Make// it blank (nothing between the quotation marks) if// you aren't displaying the number of characters typed.var CharactersTypedFieldName = "CharsTyped";// Value Six:// Specify the field name where where is to be displayed// the number of characters left that may be typed.// Make it blank (nothing between the quotation marks)// if you aren't displaying the number of characters// left.var CharactersLeftFieldName = "CharsLeft";// Value Seven:// Specify the field name where where is to be displayed// the number of words the user has typed. Make it// blank (nothing between the quotation marks) if you// aren't displaying the number of words typed.var WordsTypedFieldName = "WordsTyped";// Value Eight:// Specify the field name where where is to be displayed// the number of words left that may be typed. Make it// blank (nothing between the quotation marks) if you// aren't displaying the number of words left.var WordsLeftFieldName = "WordsLeft";//////////////////////////////////////////////////////// //// No modfications are required below this point. //// ////////////////////////////////////////////////////////var WordsMonitor = 0;var MaxWords = parseInt(MaximumWords);var MaxChars = parseInt(MaximumCharacters);var textfield = 'document.' + FormName + '.' + TextFieldName + '.value';function WordLengthCheck(s,l) {WordsMonitor = 0;var f = false;var ts = new String();for(var vi = 0; vi < s.length; vi++) {vs = s.substr(vi,1);if((vs >= 'A' && vs <= 'Z') || (vs >= 'a' && vs <= 'z') || (vs >= '0' && vs <= '9')) {if(f == false){f = true;WordsMonitor++;if((l > 0) && (WordsMonitor > l)) {s = s.substring(0,ts.length);vi = s.length;WordsMonitor--;}}}else { f = false; }ts += vs;}return s;} // function WordLengthCheck()function CharLengthCheck(s,l) {if(s.length > l) { s = s.substring(0,l); }return s;} // function CharLengthCheck()function InputCharacterLengthCheck() {if(MaxChars <= 0) { return; }var currentstring = new String();eval('currentstring = ' + textfield);var currentlength = currentstring.length;eval('currentstring = CharLengthCheck(' + textfield + ',' + MaxChars + ')');if(CharactersLeftFieldName.length > 0) {var left = 0;eval('left = ' + MaxChars + ' - ' + textfield + '.length');if(left < 0) { left = 0; }eval('document.' + FormName + '.' + CharactersLeftFieldName + '.value = ' + left);if(currentstring.length < currentlength) { eval(textfield + ' = currentstring.substring(0)'); }}if(CharactersTypedFieldName.length > 0) {eval('document.' + FormName + '.' + CharactersTypedFieldName + '.value = ' + textfield + '.length');if(currentstring.length < currentlength) { eval(textfield + ' = currentstring.substring(0)'); }}} // function InputCharacterLengthCheck()function InputWordLengthCheck() {if(MaxWords <= 0) { return; }var currentstring = new String();eval('currentstring = ' + textfield);var currentlength = currentstring.length;eval('currentstring = WordLengthCheck(' + textfield + ',' + MaxWords + ')');if (WordsLeftFieldName.length > 0) {var left = MaxWords - WordsMonitor;if(left < 0) { left = 0; }eval('document.' + FormName + '.' + WordsLeftFieldName + '.value = ' + left);if(currentstring.length < currentlength) { eval(textfield + ' = currentstring.substring(0)'); }}if (WordsTypedFieldName.length > 0) {eval('document.' + FormName + '.' + WordsTypedFieldName + '.value = ' + WordsMonitor);if(currentstring.length < currentlength) { eval(textfield + ' = currentstring.substring(0)'); }}} // function InputWordLengthCheck()function InputLengthCheck() {InputCharacterLengthCheck();InputWordLengthCheck();} // function InputLengthCheck()</script><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><p>This is an example textarea form field that limits input to either 80 characters or 16 words, whichever comes first.</p><form name="myForm"><textarea cols="30" rows="5" name="TextField" onBlur="InputLengthCheck();" onKeyUp="InputLengthCheck();"></textarea><br><input readonly type="text" name="CharsTyped" size="8"> characters typed<br><input readonly type="text" name="CharsLeft" size="8"> characters left<br><input readonly type="text" name="WordsTyped" size="8"> words typed<br><input readonly type="text" name="WordsLeft" size="8"> words left</form><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->