php - keep selected dynamic dropdown list after submit -


below code populate dynamic list.

<?php if(isset($_post['supplier'])) {  include 'db.php';  $stmt = $mysql->prepare("select distinct supplierbrand plastic headingno='".$_post['supplier']."' order supplierbrand"); $stmt->execute(); $stmt->bind_result($supplierbrand); ?> <option value="all" width="100px">--all--</option> <?php while ($row = $stmt->fetch()) : ?>  <option value="<?php echo $supplierbrand; if($_post['county'] == $supplierbrand) {echo "selected";} ?>" width="100px"><?php echo $supplierbrand; ?></option>  <?php endwhile; ?>  <?php } ?>

i added code if($_post['county'] == $supplierbrand) {echo "selected";} try , retain selected value onsubmit. code in context not work. after debugging noticed county value undefined. error chrome debugging:

notice&lt;/b&gt;:  undefined index: county

how value county on page , further more above php script value $_post['supplier'] passed use of jquery.

below html code:

<div id="county_drop_down">                         <select id="county" name="county" >                             <option value="" width="100px">supplier...</option>                         </select>                         </div>                             <span id="loading_county_drop_down">                             <img src="css/loader.gif" width="16" height="16" align="absmiddle">&nbsp;loading...</span>                             <div id="no_county_drop_down">no lens type/design has been selected.</div>

for javascript, please see link

loads of issues in code here's few of them fix first.

value="<?php echo $supplierbrand; if($_post['county'] == $supplierbrand) {echo "selected";} ?>"

will result in value="(int) selected" invalid html should value="<?php echo $supplierbrand;?>" <?php echo ($_post['county'] == $supplierbrand) ? "selected=\"selected\"" : "" ; ?> remember valid html selected="selected" , checked="checked" etc.

you're missing select open in code above assume created else where?

your country value being posted in page need st ore locally , pass through page when reposts self. use hidden fields if $_post['country'] incoming page on page use <input type="hidden" name="country" id="country" value="<?php echo $_post['country'];?>" /> make sure received country previous page , repopulates field whatever inbound previous on repost.

then if statement above work fine $_post['country'] exist.

finally pointed out isset() should lower case isset()

are using custom db class ? looks mysqli or pdo prepare lists looks wrong should not $mysqli->prepare()? since you're using prepare should doing param binding rather injecting $_post['supplier'] prepare @ moment way of doing makes prepare kinda pointless , makes vulnerable sql injection etc.


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