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How to parse input values ​​[] and put them in a Javascript array

Say I have this:

<form id='foo'>
 <input name='bar[name]' />
 <input name='bar[age]' />
</form>

How can I get the input values ​​of an array in a form fooand put them in an associative array / object as follows:

var result = {bar:{name:'blah',age:21}};

PS I do not want to use any frameworks for this.

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5 answers

This will give you the elements:

 var result = {};
    var elements = document.forms.foo.getElementsByTagName("input");
    for(var i = 0; i < elements.length; i++)
    {
       /* do whatever you need to do with each input */
    }
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I needed to do this myself, and, finding this question, I did not like any of the answers: I do not like the regular expression, and the rest are limited.

You can get a variable in datamany ways. When I implement this, I will use the jQuery method serializeArray.

function parseInputs(data) {
    var ret = {};
retloop:
    for (var input in data) {
        var val = data[input];

        var parts = input.split('[');       
        var last = ret;

        for (var i in parts) {
            var part = parts[i];
            if (part.substr(-1) == ']') {
                part = part.substr(0, part.length - 1);
            }

            if (i == parts.length - 1) {
                last[part] = val;
                continue retloop;
            } else if (!last.hasOwnProperty(part)) {
                last[part] = {};
            }
            last = last[part];
        }
    }
    return ret;
}
var data = {
    "nom": "123",
    "items[install][item_id_4]": "4",
    "items[install][item_id_5]": "16",
    "items[options][takeover]": "yes"
};
var out = parseInputs(data);
console.log('\n***Moment of truth:\n');
console.log(out);
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.

function putIntoAssociativeArray() {

    var 
        form = document.getElementById("foo"),
        inputs = form.getElementsByTagName("input"),
        input,
        result = {};

    for (var idx = 0; idx < inputs.length; ++idx) {
        input = inputs[idx];
        if (input.type == "text") {
            result[input.name] = input.value;
        }
    }

    return result;
}
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var form = document.getElementById( 'foo' );
var inputs = form.getElementsByTagName( "input" );
var regex = /(.+?)\[(.+?)\]/;
var result = {};
for( var i = 0; i < inputs.length; ++i ) {
    var res = regex.exec( inputs[i].name );
    if( res !== null ) {
        if( typeof result[ res[1] ] == 'undefined' ) result[ res[1] ] = {};
        result[ res[1] ][ res[2] ] = inputs[i].value;
    }
}
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var inputs = document.getElementsByTagName('input');
var field_name, value, matches, result = {};
for (var i = 0; i < inputs.length; i++) {
   field_name = inputs[i].name;
   value = inputs[i].value;

   matches = field_name.match(/(.*?)\[(.*)\]/);

   if (!results[matches[0]]) {
       results[matches[0]] = {};
   }
   results[matches[0]][matches[1]] = value;
}
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