The JavaScript Source: Forms : Universal Form Validator

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Universal Form Validator

Validate form elements of all kinds: select boxes, text fields (including spaces), radio buttons, force numbers in textfields, etc. Very easy to use. Can be used on all forms.

The JavaScript Source: Forms : Universal Form Validator
Simply click inside the window below, use your cursor to highlight the script, and copy [Control]+C the script into a new file in your text editor (such as Note Pad) and save [Control+S]. The script is yours!!!

 /* This script and many more are available free online at The JavaScript Source :: http://javascript.internet.com Created by: Amit Wadhwa :: http://amitwadhwa.fcpages.com/javascript.com/formvalidator.html */ function checkThisForm(formname, submitbutton, errors) { if (errors == '') { eval(formname+'.'+submitbutton+'.disabled=true'); eval('document.'+formname+'.submit()'); } else { alert(errors); } } function checkText(formname, textboxname, displaytext) { var localerror = ''; if(Trim(eval('document.'+formname+'.'+textboxname+'.value'))=='') { localerror = '- '+displaytext+' is Required.\n'; } else localerror = ''; return localerror; } function checkNum(formname, textboxname, displaytext) { var localerror = ''; if(isNaN(eval('document.'+formname+'.'+textboxname+'.value'))) { localerror = '- '+displaytext+' Should Be A Number With No Spaces.\n'; } else localerror = ''; return localerror; } function checkSpaces(formname, textboxname, displaytext) { var valid = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_'; // define valid characters var localerror = ''; if(!isValid(Trim(eval('document.'+formname+'.'+textboxname+'.value')), valid)) { localerror = '- '+displaytext+' Should Not Contain Spaces.\n'; } else localerror = ''; return localerror; } function checkSelect(formname, selectboxname, displaytext) { var localerror = ''; if(eval('document.'+formname+'.'+selectboxname+'.selectedIndex')==0) { localerror = '- '+displaytext+' is Required.\n'; } else localerror = ''; return localerror; } function getRadio(formname, radioname, displaytext) { for (var i=0; i < eval('document.'+formname+'.'+radioname+'.length'); i++) { if (eval('document.'+formname+'.'+radioname+'[i].checked')) { var rad_val = eval('document.'+formname+'.'+radioname+'[i].value'); return rad_val; } } } function checkRadio(formname, radioname, displaytext) { var localerror = ''; var rad_val = ''; for (var i=0; i < eval('document.'+formname+'.'+radioname+'.length'); i++) { //check every radio button by that name if (eval('document.'+formname+'.'+radioname+'[i].checked')) { //if it is checked rad_val += '-'; } else rad_val += ''; } if (rad_val=='') { localerror = '- '+displaytext+' is Required.\n'; } return localerror; } function autoComplete (field, select, property) { /*onKeyUp="autoComplete(this,this.form.selectboxname,'value',false)" - add this to textbox where you are typing*/ var found = false; for (var i = 0; i < select.options.length; i++) { if (select.options[i][property].toUpperCase().indexOf(field.value.toUpperCase()) == 0) { found=true; break; } } if (found) { select.selectedIndex = i; } else { select.selectedIndex = -1; } if (field.createTextRange) { if (!found) { field.value=field.value.substring(0,field.value.length-1); return; } var cursorKeys ="8;46;37;38;39;40;33;34;35;36;45;"; if (cursorKeys.indexOf(event.keyCode+";") == -1) { var r1 = field.createTextRange(); var oldValue = r1.text; var newValue = found ? select.options[i][property] : oldValue; if (newValue != field.value) { field.value = newValue; var rNew = field.createTextRange(); rNew.moveStart('character', oldValue.length) ; rNew.select(); } } } } function Trim(s) { while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r')) { s = s.substring(1,s.length); } while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r')) { s = s.substring(0,s.length-1); } return s; } function isValid(string,allowed) { // var valid = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; // define valid characters for (var i=0; i< string.length; i++) { if (allowed.indexOf(string.charAt(i)) == -1) return false; } return true; }  <script type="text/javascript" src="formvalidator.js"></script>  <script type="text/javascript">  </script>  <form name="form1"> <p>Enter Name: <input type="text" name="textfield1"> (Mandatory)</p> <p>Enter Country of Residence: <select name="Country"> <option value="" selected>- Select Country -</option> <option value="India">India</option> <option value="China">China</option> <option value="UK">UK</option> <option value="USA">USA</option> </select> (Mandatory)</p> <p>Enter Age: <input type="text" name="age"> (Mandatory, Must be a number)</p> <p> Gender <input type="radio" name="Gender" value="M"> Male <input type="radio" name="Gender" value="F"> Female (Mandatory - select one)</p> <p> <input type="button" name="Submit" value="submit" onClick="check('form1', this.name);"></p> </form> <p><div align="center"> <font face="arial, helvetica" size"-2">Free JavaScripts provided<br> by <a href="http://javascriptsource.com">The JavaScript Source</a></font> </div><p>
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