using jQuery to copy column specific form values - php

Question

I've used jQuery before to copy billing addresses to shipping addresses, but if I am dynamically generating form rows with various values from PHP, how do I set up the form so that upon a checkmark, a recommended item quantity will be automatically copied just to the quantity of the same item?
Here is the basic version of the billing/shipping copy script.
<script src="../Scripts/jquery-1.7.2.min.js"></script>
<script>
$(document).ready(function(){
$("input#same").click(function()
{
if ($("input#same").is(':checked'))
{
// Checked, copy values
$("input#qty").val($("input#same").val());
}
else
{
// Clear on uncheck
$("input#quantity").val("");
}
});
});
</script>
And here is the PHP code dynamically gathering items with their suggested quantity.
while( $row = mysql_fetch_array($histresult) )
{
echo '<tr height = "50px">';
echo '<td>'.$product_id.'</td>';
echo '<td>'.$suggested_quantity.'<input id="same" name="same" type="checkbox" value ="'.$suggested_quantity.'"/> </td>';
echo '<td><input name="qty" type="text"size="4" maxlength="4"></td>';
///Other form elements go here, as well as an Add to Cart Button
}
For each item, a suggested wholesale quantity based on a user's favorite items is retrieved from the database. There is also a text field so that they can enter any amount they want before sending it to their cart. But if they check the checkbox, I want it to copy that value to the text field.
No only does this code not seem to do the trick, the difference between this and the billing/shipping copy is that now I'm dealing with a dynamic number of fields. How do I make each individual row achieve this task?

Answer 1

Using jQuery, you would essentially want to grab the suggested value from checkbox and put it in the other form element. Let's say this is your HTML:
<table>
<tr>
<td>
100 <input id="check-1" name="same" type="checkbox" value ="100"/>
<input id="qty-1" name="qty" type="text"size="4" maxlength="4">
</td>
<td>
100 <input id="check-2" name="same" type="checkbox" value ="100"/>
<input id="qty-2" name="qty" type="text"size="4" maxlength="4">
</td>
<td>
100 <input id="check-3" name="same" type="checkbox" value ="100"/>
<input id="qty-3" name="qty" type="text"size="4" maxlength="4">
</td>
</tr>
</table>
And then this would be your javascript/jQuery:
// Bind click event to ALL checkboxes
$("#same-*").live("click", function(e) {
// Only change it if box is checked
if( $(this).is(":checked") )
{
// Get suggested value
suggested_val = $(this).val();
// Place in next element (textbox)
$(this).next().val(suggested_val);
}
)};
I haven't tested this, but this is basically how it would work.
In your PHP, you would want to dynamically make those ID numbers so each row uses a unique ID. This is usually simple enough to match to your database row id.
<td>'.$suggested_quantity.'<input id="same-' . $row->id . '" name="same" type="checkbox" value ="'.$suggested_quantity.'"/> </td>

Answer 2

Change your code this way
<script>
$(document).ready(function(){
$("input.same").click(function()
{
if ($(this).is(':checked'))
{
// Checked, copy values
var temp = $(this).attr("title");
$("input#qty"+temp).val($("input#same"+temp).val());
}
else
{
// Clear on uncheck
$("input#qty"+temp).val("");
}
});
});
</script>
$i=0;
while( $row = mysql_fetch_array($histresult) )
{
echo '<tr height = "50px">';
echo '<td>'.$product_id.'</td>';
echo '<td>'.$suggested_quantity.'<input class="same" id="same'.$i.'" title="'.$i.'" name="same'.$i.'" type="checkbox" value ="'.$suggested_quantity.'"/> </td>';
echo '<td><input class="qty" name="qty'.$i.'" id="qty'.$i.'" type="text"size="4" maxlength="4"></td>';
///Other form elements go here, as well as an Add to Cart Button
$i++;
}
Hope this will helpful to you

Answer 3

Recycling IDs/names amongst several html elements is a bad idea I find.
I think it's best to make them unique.
But anyways, here's a suggestion that won't modify your html structure a lot.
Change the form tag as follows:
<form id="Order">
...
</form>
Change your PHP code as follows (added a label tag to isolate your suggested quantity better in the DOM, got rid of some unnecessary structure for your checkboxes):
while($row=mysql_fetch_array($histresult))
{
echo '<tr height = "50px">';
echo '<td>'.$product_id.'</td>';
echo '<td><label>'.$suggested_quantity.'<label><input type="checkbox" class="Same"/> </td>';
echo '<td><input name="qty" id="qty_'.$product_id.'" type="text"size="4" maxlength="4"></td>';
///Other form elements go here, as well as an Add to Cart Button
}
Finally, here is the jQuery code:
<script src="../Scripts/jquery-1.7.2.min.js"></script>
<script>
jQuery(document).ready(function(){
jQuery("form#Order").click(function(Event){ //One event handler for the form, more efficient that way and you need less html structure to keep track of things
var Target = jQuery(Event.target); //This is the html element that got clicked on
if(Target.is("input:checkbox.Same")) //Make sure it's a checkbox that suggests quantity
{
var Text = jQuery(Target.closest('tr').children().get(2)).children(); //Get the parent TR tag, get it's third child (td tag containing the text field), get it's child (the text field)
var Suggested_quantity = Target.prev().html(); //Get the previous sibling which is the label containing the quantity and get it's html content which is the quantity
if(Target.is(":checked"))
{
Text.val(Suggested_quantity);
}
else
{
Text.val("");
}
});
});
</script>
EDIT: Removed some redundant html code. Added a class to isolate the right checkboxes. Added IDs for the text field (forgot).