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Having the child feed the parent - help with Dynamic Dropdowns

Thread began 9/17/2015 11:50 am by Nathon Jones Web Design | Last modified 9/30/2015 1:51 pm by Nathon Jones Web Design | 1657 views | 12 replies

Nathon Jones Web Design

Originally Said By: Ray Borduin
  Would you still want them to be able to change the Country dropdown? Why show a list if it is already selected with the correct value?  


I need the country name displayed, just for reassurance for the client, but it doesn't need a list/menu as you have so correctly highlighted. Thing is, I need to save the country ID to database as well as the region ID.

Originally Said By: Ray Borduin
  I think you can probably add the country name to the original region list into another attribute like:

<option value="<?php echo($rs->getColumnVal['RegionID']); ?>" rel="<?php echo($rs->getColumnVal['Country']); ?>">"<?php echo($rs->getColumnVal['RegionName']); ?>"</option>

If you want them to be able to change the country and just have it pre-selected, then use the CountryID column in the rel attribute, if you only want it displayed and not changed, then I'd do an inner join in your Region recordset and put the country name in the rel attribute so you can populate the innerhtml of a span tag next to it.

Then you can add a simple javascript onchange of the region select list that will take the selected option and retrieve the associated rel attribute and use it to either display the country name or set the selection in the other list.  

I think the best option is not to allow them to change the country. They've selected the region, which is more than sufficient info to populate the country information, and with any luck the countryID into a hidden field, thus saving them a bit of time.

Sorry, I'm not familiar with the rel attribute and searching Google I can only find information about using rel with an a href tag.

This is my regions drop down, which is taken from my regions recordset within which I've done an inner join so that I can drag the country name across in one recordset.

<select id="regionID" name="regionID" class="form-control">
while(!$rsREGIONS->atEnd()) {
<option value="<?php echo($rsREGIONS->getColumnVal("regionID")); ?>" rel="<?php echo($rsREGIONS->getColumnVal['country']); ?>"><?php echo($rsREGIONS->getColumnVal("region")); ?></option>
$rsREGIONS->moveFirst(); //return RS to first record

Below this, I have set up a readonly input field because I'd still like the country to be shown in a form format/layout. I have included a hidden field for the countryID though.

<input type="text" class="form-control" id="country" name="country" placeholder="Country..." readonly>
<input type="hidden" id="countryID" name="countryID" value="">

How do I use the rel attribute to populate the country, readonly, input field and, at the same time, populate the countryID hidden field with the unique country ID?

You mentioned "...populate the innerhtml of a span tag next to it." but don't we have to wait on the region selection by the user?

I understand I'll need an onchange event for the region select:
<select id="regionID" name="regionID" class="form-control" onchange="myFunction()">

I just don't have the knowledge to write the javascript function. I assume the function populates the country and countryID fields "onchange" of the region drop down.

Would appreciate any advice you could offer. Thank you Ray.

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