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POIE6 displays JavaScript error for below given function and error is also mentioned below
 

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  1. POIE6 displays JavaScript error for below given function and error is also mentioned below
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    <p>I have a function </p> <pre><code>function setbid(catid) { if(catid == 30) { document.getElementById('bannerid').value = 1; } else if(catid == 31){ document.getElementById('bannerid').value = 2; } else if(catid == 32){ document.getElementById('bannerid').value = 6; } } </code></pre> <p>this function is being called onchange event of select box.</p> <p>now when the value of select box is changed IE throws me an error saying </p> <p>"document.getElementId(....)" is null or not an object..</p> <p>Now what can i infer from this?</p> <p>please help..</p> <blockquote> <p><strong>UPDATE</strong></p> </blockquote> <p>As per David's Reply how can i check for its existance before the assignment of value to that field,? Also other browsers do not display this error, I have this bannerid field as hidden field in the document... What should be done?</p> <p>Below is the screen shot of the error displayed onchange of select box <img src="https://i.stack.imgur.com/cPSnv.jpg" alt="alt text"></p> <blockquote> <p><strong>Update 2</strong> Update as per the answer of @haylem</p> </blockquote> <pre><code>&lt;script&gt; function setbid(catid) { var lookup = { '30' : 1, '31' : 2, '32' : 6 }; if (lookup.hasOwnProperty(catid)) { var el = document.getElementById('bannerid'); if (el) { el.value = lookup[catid]; } } /*if(catid == 30) { if(typeof(document.getElementById('bannerid')) == null ){ document.getElementById('bannerid').value = 1; } } else if(catid == 31){ document.getElementById('bannerid').value = 2; } else if(catid == 32){ document.getElementById('bannerid').value = 6; }*/ } &lt;/script&gt; &lt;div style="margin:0px auto"&gt; &lt;div class="instantprice-popup-bg"&gt; &lt;form name="instantpop" id="instantpop" action="" method="post" style="margin:0px; padding:0px" onsubmit=""&gt; &lt;input type="hidden" name="sessid" id="sessid" value="&lt;?php echo $_GET['osCsid'];?&gt;"&gt; &lt;div class="instantprice"&gt; &lt;ul&gt; &lt;li class="text12pt" style="color:#FF0000; display:none;" id="appsize"&gt;For special low price on sizes over 30ft. wide and 10ft. height contact us on sales@bannerbuzz.com.&lt;/li&gt; &lt;li class="text12pt" style="color:#FF0000; display:none;" id="vinylsize"&gt;Please enter width upto 30 ft &amp; height upto 5 ft for Vinyl Signs/Decals(Posters).&lt;/li&gt; &lt;li class="col1"&gt;Select Product&lt;/li&gt; &lt;li class="col2"&gt; &lt;input type="hidden" name="price" id="price" value="&lt;?php echo "15"; ?&gt;" /&gt; &lt;input type="hidden" name="bannerid" id="bannerid" value="" /&gt; &lt;select name="product" class="dropdownfield" id="product" style="width: 180px;" onchange="javascript:setbid(document.getElementById('product').value);"&gt; &lt;option value=""&gt;Select Product&lt;/option&gt; &lt;?php while($result=mysql_fetch_object($sql_query)) { ?&gt;&lt;option value="&lt;?php echo $result-&gt;categories_id;?&gt;" &lt;?php if($_POST['product'] == $result-&gt;categories_id) {?&gt; selected="selected" &lt;?php } ?&gt;&gt;&lt;?php echo $result-&gt;categories_name;?&gt;&lt;/option&gt;&lt;?php } ?&gt; &lt;/select&gt; &lt;/li&gt; &lt;li class="col1"&gt;Select Size (in ft.)&lt;/li&gt; &lt;li class="col2"&gt; &lt;div class="sizebox" style="width:250px;"&gt; &lt;div class="sizebox col1"&gt;&lt;input name="size_w" id="size_w" type="text" class="sizetextfield1" value="&lt;?php if(isset($_REQUEST['size_w'])){ echo $_REQUEST['size_w']; } else { echo "2"; } ?&gt;" &gt;&lt;/div&gt; &lt;div class="sizebox col2"&gt;&lt;img src="images/homepage/up-arrow.jpg" width="12" height="9" border="0" align="top" onclick="increaseCounter('size_w')" /&gt;&lt;img src="images/homepage/down-arrow.jpg" width="12" height="9" border="0" onclick="decreaseCounter('size_w');" /&gt;&lt;/div&gt; &lt;div class="sizebox col3" style="width:35px;"&gt;width&lt;/div&gt; &lt;div class="sizebox col1"&gt;&lt;input name="size_h" id="size_h" type="text" class="sizetextfield1" value="&lt;?php if(isset($_REQUEST['size_h'])){ echo $_REQUEST['size_h']; } else { echo "2"; } ?&gt;" style="margin-left:8px" &gt;&lt;/div&gt; &lt;div class="sizebox col2"&gt;&lt;img src="images/homepage/up-arrow.jpg" width="12" height="9" border="0" align="top" onclick="increaseCounter('size_h');" /&gt;&lt;img src="images/homepage/down-arrow.jpg" width="12" height="9" border="0" onclick="decreaseCounter('size_h');" /&gt;&lt;/div&gt; &lt;div class="sizebox col3" style="width:35px;"&gt;&amp;nbsp;height&lt;/div&gt; &lt;input name="size" id="size" type="hidden" value="&lt;?php echo $_REQUEST['size_h'].'x'.$_REQUEST['size_w']; ?&gt;"&gt; &lt;/div&gt; &lt;/li&gt; &lt;li class="col1"&gt;Select Quantity&lt;/li&gt; &lt;li class="col2"&gt; &lt;select id="qty" name="qty" &gt; &lt;?php for($i=1;$i&lt;=100;$i++) { ?&gt; &lt;option value="&lt;?php echo $i;?&gt;" &lt;?php if($_POST['qty'] == $i) {?&gt; selected="selected" &lt;?php } ?&gt;&gt;&lt;?php echo $i;?&gt;&lt;/option&gt; &lt;?php } ?&gt; &lt;/select&gt; &lt;/li&gt; &lt;li class="col1"&gt;Select Shipping&lt;/li&gt; &lt;li class="col2"&gt; &lt;select id="shipping_method" name="shipping_method" class="dropdownfield" &gt; &lt;option value=""&gt;Select Shipping&lt;/option&gt; &lt;option value="standard" &lt;?php if($_POST['shipping_method'] == 'standard') {?&gt; selected="selected" &lt;?php } ?&gt;&gt;Standard (7 - 12 days from proof)&lt;/option&gt; &lt;option value="expedited"&lt;?php if($_POST['shipping_method'] == 'expedited') {?&gt; selected="selected" &lt;?php } ?&gt;&gt;Expedited (5 work days from Proof)&lt;/option&gt; &lt;/select&gt; &lt;/li&gt; &lt;li class="col1" id="sidehead"&gt;Two Side Banner&lt;/li&gt; &lt;li class="col2" id="sideval"&gt; &lt;input type="checkbox" id="side" name="side" value="1" /&gt; &lt;/li&gt; &lt;li class="col1"&gt;Product Price&lt;/li&gt; &lt;li class="col2"&gt;&lt;span class="text15pt" id="total_display"&gt;$0&lt;/span&gt; &lt;input type="hidden" id="total" name="total" class="textfield" value="15" readonly="readonly" style="width:60px;"/&gt; &lt;/li&gt; &lt;li class="col1"&gt;Shipping Cost&lt;/li&gt; &lt;li class="col2"&gt;&lt;span class="text15pt" id="shipping_display"&gt;$0&lt;/span&gt; &lt;input type="hidden" id="shipping" name="shipping" class="textfield" value="" readonly="readonly" style="width:60px;" /&gt; &lt;/li&gt; &lt;li class="bannerprice" id="grand_total_display"&gt;TOTAL PRICE : $0 &lt;/li&gt;&lt;input type="hidden" id="grand_total" name="grand_total" value="" readonly="readonly" style="width:60px;" /&gt; &lt;li style="float:none; text-align:center"&gt; &lt;input type="submit" class="getprice-btn" name="getprice" value="" /&gt; &lt;/li&gt; &lt;li class="text12pt"&gt;Final Price, No Hidden Charges&lt;/li&gt; &lt;/ul&gt; &lt;input type="hidden" name="getpriceclick" value="1" /&gt; &lt;/div&gt; &lt;/form&gt; &lt;/div&gt; &lt;/div&gt; </code></pre>
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