jquery - Change dropdown value based on Text Input

Question

I would like to change a select option based on the text input value.

For example, when typing mydomain.com, this should happen:

• I type "mydomain"
• I type "." (dot)
• It stops adding values to text input
• It searches for a select option with ".com" and select it

I have edited this old question of mine to make it clearer. This is a screenshot I had of that time, it might help illustrate the issue:

Code example:

<input type="text" autocomplete="off" id="domain" name="domain">

<select id="extension" name="extension">
    <option value=".com">.com</option>
    <option value=".com.br">.com.br</option>
    <option value=".net">.net</option>
    <option value=".org">.org</option>
    <option value=".info">.info</option>
    <option value=".biz">.biz</option>
    <option value=".tv">.tv</option>
    <option value=".name">.name</option>
    <option value=".ws">.ws</option>
    <option value=".cc">.cc</option>
    <option value=".blog.br">.blog.br</option>
    <option value=".flog.br">.flog.br</option>
    <option value=".vlog.br">.vlog.br</option>
    <option value=".wiki.br">.wiki.br</option>
    <option value=".adm.br">.adm.br</option>
    <option value=".adv.br">.adv.br</option>
    <option value=".agr.br">.agr.br</option>
    <option value=".am.br">.am.br</option>
    <option value=".arq.br">.arq.br</option>
    <option value=".art.br">.art.br</option>
    <option value=".ato.br">.ato.br</option>
    <option value=".bio.br">.bio.br</option>
    <option value=".bmd.br">.bmd.br</option>
    <option value=".cim.br">.cim.br</option>
    <option value=".cng.br">.cng.br</option>
    <option value=".cnt.br">.cnt.br</option>
    <option value=".coop.br">.coop.br</option>
    <option value=".ecn.br">.ecn.br</option>
    <option value=".edu.br">.edu.br</option>
    <option value=".eng.br">.eng.br</option>
    <option value=".esp.br">.esp.br</option>
    <option value=".etc.br">.etc.br</option>
    <option value=".eti.br">.eti.br</option>
    <option value=".far.br">.far.br</option>
    <option value=".fm.br">.fm.br</option>
    <option value=".fnd.br">.fnd.br</option>
    <option value=".fot.br">.fot.br</option>
    <option value=".fst.br">.fst.br</option>
    <option value=".g12.br">.g12.br</option>
    <option value=".ggf.br">.ggf.br</option>
    <option value=".gov.br">.gov.br</option>
    <option value=".imb.br">.imb.br</option>
    <option value=".ind.br">.ind.br</option>
    <option value=".inf.br">.inf.br</option>
    <option value=".jor.br">.jor.br</option>
    <option value=".lel.br">.lel.br</option>
    <option value=".mat.br">.mat.br</option>
    <option value=".med.br">.med.br</option>
    <option value=".mil.br">.mil.br</option>
    <option value=".mus.br">.mus.br</option>
    <option value=".net.br">.net.br</option>
    <option value=".nom.br">.nom.br</option>
    <option value=".not.br">.not.br</option>
    <option value=".ntr.br">.ntr.br</option>
    <option value=".odo.br">.odo.br</option>
    <option value=".org.br">.org.br</option>
    <option value=".ppg.br">.ppg.br</option>
    <option value=".pro.br">.pro.br</option>
    <option value=".psc.br">.psc.br</option>
    <option value=".psi.br">.psi.br</option>
    <option value=".qsl.br">.qsl.br</option>
    <option value=".rec.br">.rec.br</option>
    <option value=".slg.br">.slg.br</option>
    <option value=".srv.br">.srv.br</option>
    <option value=".tmp.br">.tmp.br</option>
    <option value=".trd.br">.trd.br</option>
    <option value=".tur.br">.tur.br</option>
    <option value=".tv.br">.tv.br</option>
    <option value=".vet.br">.vet.br</option>
    <option value=".zlg.br">.zlg.br</option>
</select>

Answer 1

You could use jQuery to do this as the user types...

$(document).ready(function() {
    $('#search').keyup(function() {
        //The user has typed something. See what they typed and split it.
        var value = $(this).val();
        var components = value.split(".");
        if(components.length == 2) {
            //They have typed a TLD like .com
            if($("#extensao option[value='."+ components[1] + "']").length > 0) {
                //They have typed an available TLD. Select the dropdown and update the box.
                $("#search").val(components[0]);
                $("#extensao").val("." + components[1]);
            }
        } else if (components.length > 2) {
            //They have typed a Second level domain like .blog.br
            if($("#extensao option[value='."+ components[components.length - 2] + "." + components[components.length - 1] + "']").length > 0) {
                //They have typed an available second level domain.
                $("#search").val(components[0]);
                $("#extensao").val("." + components[components.length - 2] + "." + components[components.length - 1]);
            }
        }
    });
});

Not sure if this was the kind of solution you were looking for (or something server-side). Either way you would need the additional server-side verification.