[jsFiddle][1]
I need to access the correct (displayed) [knob][2] values on demand with jQuery.
I know about the 'change' function, but I need to access the values of multiple knobs at once.
I need to multiply each of these knob’s values by specific amounts and then sum the result; Is there a way to get the 'change' function to supply the knob’s id or some other identifying attribute so my script can tell their values apart?
This calculate function is what I have so far, I’ve made it trigger on every knob’s 'change' and when a button is clicked:
function calculate() {
var result = 0;
$('.dial').each(function (e) {
result += $(this).val(); //Multiply by 1 to get an int
});
$('#result').text((typeof result) + ' ' + result); //Why is this a string in the first place?
}
With this to set up the knobs:
$('.dial').each(function (e) {
$(this).knob({
max: 99,
width: 120,
height: 120,
bgColor: '#85d4b0',
fgColor: '#0ca961',
inputColor: '#0ca961',
thickness: 0.15,
change: function (v) {
console.log(v, this.v, this.cv);
calculate(); //I need it to (re-)calculate every time any knob's value changes
}
});
}
.val() doesn’t work because it seems to be lagging behind; the first time it’s run it doesn’t update the result and the consecutive times it does, but it changes it to that of the previous value.
Any ideas?
Edit:
If I could get the id of the knob whose value changed, I could do the following:
var knobs = [{
id: '',
val: 0
}];
$('.dial').each(function () {
$(this).knob({change: function(v, id){
knobsMod(v, id);
}});
});
$('.dial').parent().each(function (e) {
$(this).attr('id', 'knob'+e);
if (e > (knobs.length - 1)) {
knobs[e] = $.extend({}, knobs[0]);
}
knobs[e].id = $(this).attr('id');
knobs[e].val = $(this).val()*1;
});
function knobsMod(v, id){
for (var i = 0; i < knobs.length; i++){
if (knobs[i].id === id){
knobs[i].val = v;
break;
}
}
}
And then it could just read the knobs object whenever it recalculates.
[1]: http://jsfiddle.net/SoullessWaffle/2mt2U/
[2]: http://anthonyterrien.com/knob/
Answer
It turned out I didn’t need an id to tell them apart.
var knobs = [],
cdata = [
{name: 'knob0', value: 1},
{name: 'knob1', value: 2},
{name: 'knob2', value: 5},
{name: 'knob3', value: 200},
{name: 'knob4', value: 400},
{name: 'knob5', value: 800},
{name: 'knob6', value: 1000},
{name: 'knob7', value: 2000},
{name: 'knob8', value: 3000},
{name: 'knob9', value: 5000},
{name: 'knob10', value: 8000},
{name: 'knob11', value: 10000},
{name: 'knob12', value: 20000},
{name: 'knob13', value: 1200},
{name: 'knob14', value: 8000},
{name: 'knob15', value: 12000},
{name: 'knob16', value: 12000},
{name: 'knob17', value: 12000},
{name: 'knob18', value: 12000},
{name: 'knob19', value: 12000},
{name: 'knob20', value: 16000},
{name: 'knob21', value: 16000},
{name: 'knob22', value: 16000},
{name: 'knob23', value: 18000},
{name: 'knob24', value: 20000}
];
$(document).ready(function () {
$('.dial').each(function (e) {
knobs.push(0);
$(this).knob({
max: 99,
width: 120,
height: 120,
bgColor: '#85d4b0',
fgColor: '#0ca961',
inputColor: '#0ca961',
thickness: 0.15,
change: function (v) {
knobs[e] = v; //e can be used as an identifier
console.log(calculate());
}
});
});
});
function calculate() {
var result = 0;
for (var i = 0; i < cdata.length; i++){
result += knobs[i] * cdata[i].value;
}
return result;
}
Here I’m using e as an identifier, which allows me to maintain an array of knob values and thus store every knob’s value individually.
Then the calculate(); function reads the array and multiplies each value by a specific amount (as specified in cdata) and returns the result.