php - How to prevent the set of a get variable? -


i have question. let me explain example. have piece of code:

<form action="vehicles.php" method="get">    <span>marca:        <select name="brand">            <option value="null" selected="selected"></option>            <option value="volkswagen">volkswagen</option>            <option value="renault">renault</option>            <option value="peugeot">peugeot</option>            <option value="fiat">fiat</option>        </select>    </span>    <span>modelo:         <select name="model">            <option value="null" selected="selected"></option>            <option value="206">206</option>            <option value="suran">suran</option>            <option value="passat">passat</option>            <option value="punto">punto</option>         </select>    </span>    <input type="submit"> </form>

is way prevent assignment of variables if option selected "null" one?

if, example, select brand="renault" , model="null" url is

http://mywebpage.com/vehicles.php?brand=renault&model=null

but should be

http://mywebpage.com/vehicles.php?brand=renault

i know how unset variables "null" value after form submission php. way before submission , after variables setted "null". cleaner url, free of "variable=null" results.

p/d: don't have native english speaking feel free edit question. wish understand me.

i afraid might need javascript achieve want.
take @ code:

<form action="vehicles.php" id="carform" method="get">    <span>marca:        <select name="brand" id="brand">           <option value="none" selected>-</option>           <option value="volkswagen">volkswagen</option>           <option value="renault">renault</option>           <option value="peugeot">peugeot</option>           <option value="fiat">fiat</option>        </select>    </span>    <span>modelo:        <select name="model" id="model">          <option value="none" selected="selected">-</option>          <option value="206">206</option>          <option value="suran">suran</option>          <option value="passat">passat</option>          <option value="punto">punto</option>       </select>    </span>    <input type="button" value="submit" onclick="submitformfilter();" /> </form>

javascript : code this: 

<script> function submitformfilter(){    var myform = document.getelementbyid("carform");    var carbrand = document.getelementbyid("brand");    var carmodel = document.getelementbyid("model");     if(carbrand.value === "none" || null){        carbrand.parentnode.removechild(carbrand);    }     if(carmodel.value === "none" || null){        carmodel.parentnode.removechild(carmodel);    }     myform.submit(); } </script>

http://jsfiddle.net/7xzkp/1/

you can try here.


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