Shows the usage of callback functions for checking a field
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Example 6</title>
<style rel="stylesheet" type="text/css">
body, p, td, li, h1, h2, h3 { font-family: "Lucida Grande", Verdana, Arial, Helvetica, Geneva, sans-serif; }
body, p, td, li, h2, h3 { font-size: 12px; }
h2, h3 { font-weight: bold; color:#323777; margin-bottom: 11px; }
h1 { font-size:16px; font-weight: bold; color:#DB3259; margin-bottom: 3px; }
h2, h3 { margin-top: 17px; }
.header { font-weight: bold; color:#323777; margin-bottom: 11px; }
.headline { font-weight: bold; color:#323777; }
p { margin-top: 14px; }
a { text-decoration: none; color:#323788; }
a:hover { text-decoration: underline; }
a.nav { text-decoration: none; color:#000000; }
a.nav:hover { text-decoration: underline; }
pre { font-family:Courier New, Courier, monospace; font-size:12px; }
ul { list-style-type: square; margin-top: 2px; }
td.header { color: #FFFFFF; background-color:#323777; }
td.cell { background-color:#FFFFFF; }
input, select { border: 1px solid silver; }
input.error, select.error {padding-right: 16px; border: 1px solid red; background-color: #FFFCE2; background-image: url(validateimages/warning_obj.gif); background-position: right; background-repeat: no-repeat;}
input:focus, select:focus {border: 1px solid red; background-color:#EFEFEF;}
.mandatory { font-weight: bold; }
.comment { color: #BBBBBB; }
</style>
<script language="javascript">
function validateCompleteForm(objForm,strErrorClass){
return _validateInternal(objForm,strErrorClass,0);
};
function validateStandard(objForm,strErrorClass){
return _validateInternal(objForm,strErrorClass,1);
};
function _validateInternal(form,strErrorClass,nErrorThrowType){
var strErrorMessage="";var objFirstError=null;
if(nErrorThrowType==0){
strErrorMessage=(form.err)?form.err:_getLanguageText("err_form");
};
var fields=_GenerateFormFields(form);
for(var i=0;i<fields.length;++i){
var field=fields[i];
if(!field.IsValid(fields)){
field.SetClass(strErrorClass);
if(nErrorThrowType==1){
_throwError(field);
return false;
}else{
if(objFirstError==null){
objFirstError=field;
}
strErrorMessage=_handleError(field,strErrorMessage);
bError=true;
}
}else{
field.ResetClass();
}
};
if(objFirstError!=null){
alert(strErrorMessage);
objFirstError.element.focus();
return false;
};
return true;
};
function _getLanguageText(id){
objTextsInternal=new _jsVal_Language();
objTexts=null;
try{
objTexts=new jsVal_Language();
}catch(ignored){};
switch(id){
case "err_form":strResult=(!objTexts||!objTexts.err_form)?objTextsInternal.err_form:objTexts.err_form;break;
case "err_enter":strResult=(!objTexts||!objTexts.err_enter)?objTextsInternal.err_enter:objTexts.err_enter;break;
case "err_select":strResult=(!objTexts||!objTexts.err_select)?objTextsInternal.err_select:objTexts.err_select;break;
};
return strResult;
};
function _GenerateFormFields(form){
var arr=new Array();
for(var i=0;i<form.length;++i){
var element=form.elements[i];
var index=_getElementIndex(arr,element);
if(index==-1){
arr[arr.length]=new Field(element,form);
}else{
arr[index].Merge(element)
};
};
return arr;
};
function _getElementIndex(arr,element){
if(element.name){
var elementName=element.name.toLowerCase();
for(var i=0;i<arr.length;++i){
if(arr[i].element.name){
if(arr[i].element.name.toLowerCase()==elementName){
return i;
}
};
};
}
return -1;
};
function _jsVal_Language(){
this.err_form="Please enter/select values for the following fields:\n\n";
this.err_select="Please select a valid \"%FIELDNAME%\"";
this.err_enter="Please enter a valid \"%FIELDNAME%\"";
};
function Field(element,form){
this.type=element.type;
this.element=element;
this.exclude=element.exclude||element.getAttribute('exclude');
this.err=element.err||element.getAttribute('err');
this.required=_parseBoolean(element.required||element.getAttribute('required'));
this.realname=element.realname||element.getAttribute('realname');
this.elements=new Array();
switch(this.type){
case "textarea":
case "password":
case "text":
case "file":
this.value=element.value;
this.minLength=element.minlength||element.getAttribute('minlength');
this.maxLength=element.maxlength||element.getAttribute('maxlength');
this.regexp=this._getRegEx(element);
this.minValue=element.minvalue||element.getAttribute('minvalue');
this.maxValue=element.maxvalue||element.getAttribute('maxvalue');
this.equals=element.equals||element.getAttribute('equals');
this.callback=element.callback||element.getAttribute('callback');
break;
case "select-one":
case "select-multiple":
this.values=new Array();
for(var i=0;i<element.options.length;++i){
if(element.options[i].selected&&(!this.exclude||element.options[i].value!=this.exclude)){
this.values[this.values.length]=element.options[i].value;
}
}
this.min=element.min||element.getAttribute('min');
this.max=element.max||element.getAttribute('max');
this.equals=element.equals||element.getAttribute('equals');
break;
case "checkbox":
this.min=element.min||element.getAttribute('min');
this.max=element.max||element.getAttribute('max');
case "radio":
this.required=_parseBoolean(this.required||element.getAttribute('required'));
this.values=new Array();
if(element.checked){
this.values[0]=element.value;
}
this.elements[0]=element;
break;
};
};
Field.prototype.Merge=function(element){
var required=_parseBoolean(element.getAttribute('required'));
if(required){
this.required=true;
};
if(!this.err){
this.err=element.getAttribute('err');
};
if(!this.equals){
this.equals=element.getAttribute('equals');
};
if(!this.callback){
this.callback=element.getAttribute('callback');
};
if(!this.realname){
this.realname=element.getAttribute('realname');
};
if(!this.max){
this.max=element.getAttribute('max');
};
if(!this.min){
this.min=element.getAttribute('min');
};
if(!this.regexp){
this.regexp=this._getRegEx(element);
};
if(element.checked){
this.values[this.values.length]=element.value;
};
this.elements[this.elements.length]=element;
};
Field.prototype.IsValid=function(arrFields){
switch(this.type){
case "textarea":
case "password":
case "text":
case "file":
return this._ValidateText(arrFields);
case "select-one":
case "select-multiple":
case "radio":
case "checkbox":
return this._ValidateGroup(arrFields);
default:
return true;
};
};
Field.prototype.SetClass=function(newClassName){
if((newClassName)&&(newClassName!="")){
if((this.elements)&&(this.elements.length>0)){
for(var i=0;i<this.elements.length;++i){
if(this.elements[i].className!=newClassName){
this.elements[i].oldClassName=this.elements[i].className;
this.elements[i].className=newClassName;
}
}
}else{
if(this.element.className!=newClassName){
this.element.oldClassName=this.element.className;
this.element.className=newClassName;
}
};
}
};
Field.prototype.ResetClass=function(){
if((this.type!="button")&&(this.type!="submit")&&(this.type!="reset")){
if((this.elements)&&(this.elements.length>0)){
for(var i=0;i<this.elements.length;++i){
if(this.elements[i].oldClassName){
this.elements[i].className=this.elements[i].oldClassName;
}
else{
this.element.className="";
}
}
}else{
if(this.elements.oldClassName){
this.element.className=this.element.oldClassName;
}
else{
this.element.className="";
}
};
};
};
Field.prototype._getRegEx=function(element){
regex=element.regexp||element.getAttribute('regexp')
if(regex==null)return null;
retype=typeof(regex);
if(retype.toUpperCase()=="FUNCTION")
return regex;
else if((retype.toUpperCase()=="STRING")&&!(regex=="JSVAL_RX_EMAIL")&&!(regex=="JSVAL_RX_TEL")
&&!(regex=="JSVAL_RX_PC")&&!(regex=="JSVAL_RX_ZIP")&&!(regex=="JSVAL_RX_MONEY")
&&!(regex=="JSVAL_RX_CREDITCARD")&&!(regex=="JSVAL_RX_POSTALZIP"))
{
nBegin=0;nEnd=0;
if(regex.charAt(0)=="/")nBegin=1;
if(regex.charAt(regex.length-1)=="/")nEnd=0;
return new RegExp(regex.slice(nBegin,nEnd));
}
else{
return regex;
};
};
Field.prototype._ValidateText=function(arrFields){
if((this.required)&&(this.callback)){
nCurId=this.element.id?this.element.id:"";
nCurName=this.element.name?this.element.name:"";
eval("bResult = "+this.callback+"('"+nCurId+"', '"+nCurName+"', '"+this.value+"');");
if(bResult==false){
return false;
};
}else{
if(this.required&&!this.value){
return false;
};
if(this.value&&(this.minLength&&this.value.length<this.minLength)){
return false;
};
if(this.value&&(this.maxLength&&this.value.length>this.maxLength)){
return false;
};
if(this.regexp){
if(!_checkRegExp(this.regexp,this.value))
{
if(!this.required&&this.value){
return false;
}
if(this.required){
return false;
}
}
else
{
return true;
};
};
if(this.equals){
for(var i=0;i<arrFields.length;++i){
var field=arrFields[i];
if((field.element.name==this.equals)||(field.element.id==this.equals)){
if(field.element.value!=this.value){
return false;
};
break;
};
};
};
if(this.required){
var fValue=parseFloat(this.value);
if((this.minValue||this.maxValue)&&isNaN(fValue)){
return false;
};
if((this.minValue)&&(fValue<this.minValue)){
return false;
};
if((this.maxValue)&&(fValue>this.maxValue)){
return false
};
};
}
return true;
};
Field.prototype._ValidateGroup=function(arrFields){
if(this.required&&this.values.length==0){
return false;
};
if(this.required&&this.min&&this.min>this.values.length){
return false;
};
if(this.required&&this.max&&this.max<this.values.length){
return false;
};
return true;
};
function _handleError(field,strErrorMessage){
var obj=field.element;
strNewMessage=strErrorMessage+((field.realname)?field.realname:((obj.id)?obj.id:obj.name))+"\n";
return strNewMessage;
};
function _throwError(field){
var obj=field.element;
switch(field.type){
case "text":
case "password":
case "textarea":
case "file":
alert(_getError(field,"err_enter"));
try{
obj.focus();
}
catch(ignore){}
break;
case "select-one":
case "select-multiple":
case "radio":
case "checkbox":
alert(_getError(field,"err_select"));
break;
};
};
function _getError(field,str){
var obj=field.element;
strErrorTemp=(field.err)?field.err:_getLanguageText(str);
idx=strErrorTemp.indexOf("\\n");
while(idx>-1){
strErrorTemp=strErrorTemp.replace("\\n","\n");
idx=strErrorTemp.indexOf("\\n");
};
return strErrorTemp.replace("%FIELDNAME%",(field.realname)?field.realname:((obj.id)?obj.id:obj.name));
};
function _parseBoolean(value){
return !(!value||value==0||value=="0"||value=="false");
};
function _checkRegExp(regx,value){
switch(regx){
case "JSVAL_RX_EMAIL":
return((/^[a-zA-Z]+([\.-]?[a-zA-Z]+)*@[a-zA-Z]+([\.-]?[a-zA-Z]+)*(\.\w{2,5})+$/).test(value));
case "JSVAL_RX_TEL":
return((/^1?[\-]?\(?\d{3}\)?[\-]?\d{3}[\-]?\d{4}$/).test(value));
case "JSVAL_RX_PC":
return((/^[a-z]\d[a-z]?\d[a-z]\d$/i).test(value));
case "JSVAL_RX_ZIP":
return((/^\d{5}$/).test(value));
case "JSVAL_RX_MONEY":
return((/^\d+([\.]\d\d)?$/).test(value));
case "JSVAL_RX_CREDITCARD":
return(!isNaN(value));
case "JSVAL_RX_POSTALZIP":
if(value.length==6||value.length==7)
return((/^[a-zA-Z]\d[a-zA-Z] ?\d[a-zA-Z]\d$/).test(value));
if(value.length==5||value.length==10)
return((/^\d{5}(\-\d{4})?$/).test(value));
break;
default:
return(regx.test(value));
};
};
</script>
<script language="JavaScript">
//---- example of a callback function
function validateValue2(id, name, value)
{
objValue1 = document.getElementById("value1");
if (value*objValue1.value > 10) {
return true
}
return false;
}
</script>
</head>
<body style="margin: 10px 10px 10px 10px">
<h1>Example 6</h1>
<h2>Test-Form:</h2>
This form is using a callback function for checking the "value 2" field.
In a javascript function the value is multiplied with the value of the "value 1" field.
If the result is greater than 10 the field is valid.<br><br>
<table border="0">
<tr>
<td>
<form name="testform" method="post" onSubmit="return validateStandard(this, 'error');">
<table>
<tr>
<td class="mandatory">Value 1:</td>
<td><input type="text" name="value1" id="value1" required="1" regexp="/^\d*$/" size="40"></td>
<td class="comment">//--- Only digits allowed</td>
</tr>
<tr>
<td class="mandatory">Value 2:</td>
<td><input type="text" name="value2" id="value2" required="1" callback="validateValue2"></td>
<td class="comment">//--- field is valid if the value multiplied with the value 1 is greater than 10</td>
</tr>
<tr>
<td> </td>
<td><input type="submit" value="Submit"></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</body>
</html>
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