jQuery submits via post, but how do I get the content of my DIV

I'm not really sure if I really understand you, but if you want to get the contents of several divs that select them via the ID attribute, and then post it with the ajax request, you can use the following code:

var ids = ['123', '234', '345', '545', ...];
$('#yourSubmitButton').on('click', function(){

    var postData = {};
    ids.each(function(i, oneId){

        postData[oneId] = $('#' + oneId).html(); 
        // you can either use:
        // $('#' + oneId)[0].innerHTML or
        // document.getElementById(oneId).innerHTML   
    }); 

    $.ajax({
        method: 'post',
        url: 'url.that.will.process.the.data',
        data: postData,
        success: function(response){
            console.log(response);    
        } ,
        error: function(err){
            consolg.log(err);
        }
    });
});