Question

How can you compare multiple input in the same form if they ALL have the same value? I need to check if they all have the same value or not.

<input type="text" class="inputclass"/>
<input type="text" class="inputclass"/>
<input type="text" class="inputclass"/>
<input type="text" class="inputclass"/>
<input type="text" class="inputclass"/>
....

Answer 1

Try this:

var arr = $("input.inputclass").map(function(){
    return $(this).val();
}).toArray();

var allHaveSameValue = $.unique(arr).length == 1;

Here is the jsfiddle.net
http://jsfiddle.net/epignosisx/jzWUA/4/

UPDATE======

As @Anurag pointed out, $.unique is only for DOM elements. Here is a different implementation:

function uniqueArray(arr){
    return $.grep(arr,function(v,k){
        return $.inArray(v,arr) === k;
    });
}

var arr = $(".inputclass").map(function(){
    return $(this).val();
}).toArray();
var allHaveSameValue = uniqueArray(arr).length == 1;

Basically uses a function that will truly return a unique array.