check if the div id in JavaScript

Question

I have project that concerns about calendars, at first i have 1 calendar and now i want to have another one but they have different values.

<div id="cal">
....
</div>
<div id="calq">
....
</div>

my question is, how can I check if div id is "calq" in javascript?

if div.id == "calq" ?

... at first i have ...

<script type="text/javascript">
    monthYear = Date.today();
    var cal = new Calendar();
    cal.generateHTML();
    $('#cal').html(cal.getHTML());
    setMonthPrice();
    setSpecialPrice()
</script>

then i added

<script type="text/javascript">
    monthYear = Date.today();
    var calq = new Calendar();
    calq.generateHTML();
    $('#calq').html(calq.getHTML());
    setMonthQuantity();
    setSpecialQuantity();
</script>

but the setMonthQuantity() also called by cal, i just want the setMonthQuantity() only for calq

function setMonthQuantity()
{
    var weekdayBaseQuantity;
    weekdayBaseQuantity = {{ product.quantity }};

    $('td.calendar-day').append('<div class="dayquantity">' + weekdayBaseQuantity + '</div>');
    $('td.Sat .dayquantity, td.Sun .dayquantity').text( weekdayBaseQuantity );
}

Answer 1

To determine the existence, in clean javascript

if(document.getElementById("calq")!='undefined')
{
    // do something, it exists 
} 

using jquery

if($("#calq").length)
{
    // do something, it exists 
}

To check the id, in clean javascript

if(this.getAttribute('id')=="calc")
{
    // do something, it exists 
}

Using jquery

if($(this).attr("id")=="calq")
{
    // do something, it exists 
}

Answer 2

You can do check it, for example, via Jquery. I suppose that you want to make something like switch and for each div do some operation. If I'm right you can use Jquery's each function for looping against div elements and following condition for checking id's.

if($(this).attr("id")=="calq")