Question

I have the following in javascript:

var entriesString = '';
        $$('select[id=shopId]').each(function(elem, i){
            shops[i] = elem.value;
            entries[i] = new Array();

            $$('input[id=entry'+i+']').each(function(elem, c){
                if(elem.value != '') entries[i][c] = elem.value.replace(".", "").replace(",", "."); else entries[i][c] = '0.0'
            });
            entriesString += '&entry'+i+'=' + entries[i];
            });

Now I’m new to JS and therefore do not know what the first $$('select[id=shopId]') part means.
It must be some sort of array or collection, due to the .each part it is followed by.
In that loop is again a nested loop that uses the loop variable i in its head.
But again, I don’t know what exactly does %%('input[...]') mean. What kind of syntax is this?
Also, where does the data.

This is what entryString looks like for example:

&entry0=65.8,75.5,72.9,67.9,51.1,8.2,47.9&entry1=55.9,33.5,33.8,35.2,26.8,7.0,25.8

Thanks a lot or your help!

Answer 1

your code uses the prototype JS framework. $$('ELEMENTNAME') instanciates all DOM element with ELEMENTNAME (so i.e. all input fields) and returns them as array of objects.

with id==xy it returns that one with id xy

<input type="blah" id="xy" value="123" />

will be found