Jquery search in input checked the value of a [duplicate] property

You have to go through all the input selected to check their values one by one and insert them in an array or go forming the string according to the format you need.

var selected = [];
$('input:checked').each(function() {
    selected.push($(this).attr('codprueba'));
});
alert(selected);

To avoid conflicts with other input, I recommend that you use the name property to uniquely name these inputs. In this way you could do:

$("input:checkbox[name=my_name]:checked").each(function(){
    selected.push($(this).attr('codprueba'));
});

You can also insert them within a div with a id and select the inputs within that div:

$('#my_div_id input:checked')...

To join the array, the following sentence would suffice:

var str = selected.join("|");

To save the values of checkbox that are marked use the following (I have put the attribute name ):

var yourArray = new Array();

$("input:checkbox[name=checks]:checked").each(function(){
    yourArray.push($(this).attr('codprueba'));
});

Your checkbox will be declared as follows:

<input codprueba="Prueba1" type="checkbox" title="Observaciones Prueba1" name="checks" checked>
<input codprueba="Prueba2" type="checkbox" title="Observaciones Prueba2" name="checks" checked>
<input codprueba="Prueba3" type="checkbox" title="Observaciones Prueba3" name="checks" >

The checked attribute I have set to debug

To write the result exactly how you want it, it would be:

 document.write(yourArray.join("|"));   

To ensure that the input contains the attribute "codetest" use the selector "input [checkmark]: checked" to scroll through all the input. Here is the code example:

var arr = [];
$.map($("input[codprueba]:checked"), function(elem) {
    arr.push($(elem).attr("codprueba"));
}
var result = arr.join("|");