javascript - Have an input button show depending on a selected value -

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i have <select> drop down gets populated database. when list of items generated drop down, buttons display more information of each item. but, keep every button hidden except 1 corresponds selected value of drop down.

so let's user chooses third value of drop down. have javascript monitors change , based on value corresponding button shown. user clicks button , information of selected option displayed on alert window. user changes value again other option, previous button hidden because values don't match, , 1 shown.

please note javascript used on external file, , form has multiple drop downs need take in parameters.

javascript

function determinedisplay(item, itemview) {     var locateitem = document.getelementbyid(item);     var locateview = document.getelementbyclassname('.' + itemview);      locateitem.change(function() {         if(locateitem.value == locateview.id) {             locateview.style = "block";             locateview.show();         }         else             locateview.hide();     } }

html

<div id="snackbox" style="display: none">     <select id="dfood" name="dfood"          onchange="determinedisplay(this, 'content_one');">         <option>--select--</option>         <?php foreach($dfood_products $key => $product) :              $name = $product['name'];                     $cost = number_format($product['cost'], 2);             $item = $name . ' ($' . $cost . ')';?>             <option value="<?php echo $key; ?>"><?php echo $item; ?></option>         <?php endforeach; ?>     </select>      <input name="df_qty" type="text" placeholder="qty" size="1" maxlength="1"/>      <?php foreach($dfood_products $key => $product) : ?>         <input type="button" value="view" id="displayinfo('<?php echo $key; ?>');"          class="content_one" style="display:none"          onclick="displayinfo('<?php echo $key; ?>');"/>     <?php endforeach; ?>     </div>     <span id="snackplate"></span>

to keep solution close tried, do:

function displayinfo(key) {     alert(key); }  function determinedisplay(item, itemview) {      var locateview = document.getelementsbyclassname(itemview);     var si = item.selectedindex;     var sv = item.options[si].value;     var button = document.getelementbyid( "displayinfo('" + sv + "');");     (var i=0, max=locateview.length; < max; i++) {            locateview[i].style.display = 'none';      }      button.style.display = 'inline-block';  }

this should without chaning php.
recommend change approach use jquery create buttons etc.

some comments above changes:

  • item dom element, because calling determinedisplay "this".
  • getelementsbyclassname wrong spelled.
  • no leading dot class name. (this css syntax - supported jquery)
  • your button id strange ("displayinfo('" + sv + "')

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