I'm looking for ideas as well (1.6 or TB)
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Default product "choose" can be out of stock. The customer sees an out of stock error message like "choose is out of stock" when ordering by mistake. But I have to show other out of stock items; I don't know how to make a special case for the default showing and the other out-of-stock not showing.
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HTML5 and such are new to me; modern browsers can refuse to select a selection called
<select>
<optgroup>choose</optgroup>
<option>small</option>
<option>large</option>
</select>
They also refuse options with disabled written after option, and prefer a value there called value="" over the value the customer sees, so there are HTML methods that someone might know how to use.
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Javascript.
My old html site has something like these examples
w3schools.com/js/js_validation.asp
When I look at the source code of Prestashop I.6 I can see stuff about form validation but am not quite sure how to change it. The script could either change viability settings on the order button or pop-up an alert and make the form unusable.
Searching for solutions I find
w3schools.com/jsref/event_preventdefault.asp
...and that preventdefault is something that people use on Prestashop 1.6 web sites, so this is quite close to a solution.
Somebody somewhere must know the answer. Any ideas welcome!