How to maintain checkbox value through pagination? - html

Question

I have a list of products which are shown with pagination and I can filter the display of the products using check boxes. The problem is it can only displays the value from check box at first page, and if i go to the next page, i will lose the check box checked's value. Please help me how to solve this. I don't know where should I put input hidden and how to write Java Script. Here's my code:
<input id="checkbox_brand" type="checkbox" name="checkbox_brand[<? echo $data_brand[brand_name]; ?>]" value="<? echo $data_brand[brand_name]; ?>"/>
if (isset($_POST["checkbox_brand"])){
foreach($_POST["checkbox_brand"] as $status_a) {
$status_sql[] = '\''.$status_a.'\'';
}
$status = implode(',',$status_sql);
session_start();
$_SESSION["selected"]=$status;
}
if (session_is_registered("selected")){
-->my query
}

Answer 1

Each time you press a check box you'll have to use dictionary array in JavaScript
For example:
if I use the example page you gave, then when pressing a check box inside "Categories"
you'll have to put a value inside correct variable.
// Initialize Objects
var userChoice = {};
userChoice.Catagories = {};
userChoice.Brands = {};
userChoice.ScreenSize = {};
.
.
.
// Pressing check box will trigger the bellow
userChoice.Categories["LG"] = 0;
userChoice.Categories["Sharp"] = 1;
userChoice.Categories["Sony"] = 1;
userChoice.Brands["LcdTV"] = 1;
userChoice.Brands["LedTV"] = 0;
Each checkbox press will also trigger the following JavaScript
document.getElementById("userChoiceHiddenField").value = JSON.sringify("userChoice");
When submitting the page or going to the next page the hidden value will contain the JSON string, so you can parse it as JSON again.
Server Side: (.NET)
string userChoiceHiddenField = request["userChoiceHiddenField"].ToString();
and then take the value you got and place it back in the hidden field and the JavaScript value as follows:
userChoice = JSON.parse(document.getElementById("userChoiceHiddenField").value);
Hope that answers your question.