osCommerce jQuery price calculator

Let’s assume that we have to build a price calculator for a osCommerce website, that needs to have price based on dimensions(input from user – length, width), attributes, for each attribute there are more than 1 options with different prices for each option.

For the website that I had to build this calculator i had the attributes displayed in selects(drop downs), and one specific attribute it was displayed in div’s(material), because i needed to show picture for each option.
The attributes prices are not displayed in select options by default so from the code u need to put the prices into hidden input fields so u can use them into calculator.

Once i had that covered i needed a way to get the selected values every time user plays with the drop downs and get their prices to use in the calculator.

Let’s assume the following output code:

<div class="product-options-page">
<span>Optiuni disponibile:</span><br />
<script type="text/javascript">
var options_vector = new Array();
</script>
<div class="options">
Actionare: <select name="id[7]" id = "7">
<option value="33" SELECTED>Alege optiunea</option>
<option value="25">De la dreapta la stanga</option>
<option value="24">De la stanga la dreapta</option>
</select>
<div class="question-mark">
<a href="images/help/actionare.gif" alt="Actionare">
<img src="images/question_mark.png" border="0" alt="" width="15" height="15">
</a>
</div>
<script type="text/javascript">
options_vector[0]= "7";
</script>
<input type="hidden" id="opt-33" value="" />
<input type="hidden" id="opt-25" value="" />
<input type="hidden" id="opt-24" value="" />
</div>
<div class="options">
Sistem de prindere: <select name="id[2]" id = "2">
<option value="4">Pe rama (+2.00RON)</option>
<option value="3">Pe perete (-8.00RON)</option>
<option value="37" SELECTED>Alege optiunea</option>
</select>
<div class="question-mark">
<a href="images/help/sistem_de_prindere.gif" alt="Sistem de prindere">
<img src="images/question_mark.png" border="0" alt="" width="15" height="15">
</a>
</div>
<script type="text/javascript">
options_vector[1]= "2";
</script>
<input type="hidden" id="opt-4" value="_2.00" />
<input type="hidden" id="opt-3" value="-8.00" />
<input type="hidden" id="opt-37" value="" />
</div>
<div class="options">
Tip inchidere/deschidere:<select name="id[3]" id = "3">
<option value="13">Normala (+1.00RON)</option>
<option value="14">Opusa (+2.00RON)</option>
<option value="15">Cortina (+8.00RON)</option>
<option value="39" SELECTED>Alege optiunea</option>
</select>
<div class="question-mark">
<a href="images/help/tip_inchidere_deschidere.gif" alt="Tip inchidere/deschidere">
<img src="images/question_mark.png" border="0" alt="" width="15" height="15">
</a>
</div>
<script type="text/javascript">
options_vector[2]= "3";
</script>
<input type="hidden" id="opt-13" value="_1.00" />
<input type="hidden" id="opt-14" value="_2.00" />
<input type="hidden" id="opt-15" value="_8.00" />
<input type="hidden" id="opt-39" value="" />
</div>
</div>

Te signs from the input values marks math operators, the “_” is the replacement for “+”, because i had some troubles in JavaScript with it.

Note the array variable from JavaScript, i used it to get the id’s of the attributes so i can get the price value in JavaScript.
The following function is responsible with price grabing for the attributes options:

function get_selects(){
var price = '';
var opt_selected;
for(i = 0; i< options_vector.length; i++){
var id = options_vector[i];
select_id = '#'+id;
opt_selected = $(select_id).val();
price += $('#opt-'+opt_selected).val(); //concat
}
return price;
}

Variable “options_vector” is the one defined in the output page earlier. The returned result is a string that i will parse with another function that will replace the signs, with
math operators and will return the final result.
So at the end we have:
dimensions: height, width
price: which is in square meters
attributes prices:
material price: which is also an attribute but since is displayed with div’s each material has it’s value in a hidden input from which the value is taken on click.

The final function returns:

((length * width)/1000000)*price + (material_price*((length * width)/1000000)) + options_price

Dimensions are given in milimeters that’s why i had to divide by 1 million;
e.g.
height:1500 mm
width: 4000 mm
option 1: -9 eur
option 2: 7 eur
option 3: 2.5 eur
material: 6 eur
price: 160 eur/m2

((1500*4000)/1000000)*160 + ((1500*4000)/1000000)*6)+(-9+7+2.5) =  996.5 eur

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