javascript/OOPFormValidation.html at master · ishashankmi/javascript · GitHub

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<input type="text" id="txt" />
<input type="button" id="btn" value="Press"/>
<br/>
<br/>
<input type="text" id="txt2"/>
<input type="text" id="lname"/>
<input type="text" id="mname"/>
<input type="button" id="btn2" value="Press2"/>

<Script>

function ale(a,b,c){
	this.a=a;
	this.b=b;
	this.c=c;
};
ale.prototype.full=function(){
	var lname;
		if(this.b!=undefined){
			if(this.c!=undefined){
				lname=this.c+" "+this.b;
			}else{
				lname=this.b;
			}
		}else{
			lname="";
		};
		return "Hellow "+this.a+" "+lname;
};

document.getElementById("btn").onclick=function(){
	var txt=document.getElementById("txt").value;
	var newx=new ale(txt);
	if(txt!=""){
		alert(newx.full());
	}else{
		return false;
	}

};

document.getElementById("btn2").onclick=function(){
	var txt=document.getElementById("txt2");
	var lname=document.getElementById("lname");
	var mname=document.getElementById("mname");
	var newx=new ale(txt.value,mname.value,lname.value)
	if(txt.value!=""&&lname.value!=""){
		alert(newx.full())
	}else{
		alert("Fill All The Fields Properly");
	}

}
</script>