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POJavascript value change
 

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    <pre><code>if(isset($_POST['album_title'])) { $album_title = $_POST['album_title']; if($_FILES['pic_nr1']['type'] == 'image/jpeg' || $_FILES['pic_nr1']['type'] == 'image/jpg' || $_FILES['pic_nr1']['type'] == 'image/png' || $_FILES['pic_nr1']['type'] == 'image/gif' &amp; $_FILES['pic_nr2']['type'] == 'image/jpeg' || $_FILES['pic_nr2']['type'] == 'image/jpg' || $_FILES['pic_nr2']['type'] == 'image/png' || $_FILES['pic_nr2']['type'] == 'image/gif' &amp; $_FILES['pic_nr3']['type'] == 'image/jpeg' || $_FILES['pic_nr3']['type'] == 'image/jpg' || $_FILES['pic_nr3']['type'] == 'image/png' || $_FILES['pic_nr3']['type'] == 'image/gif' ) { } else { ?&gt; &lt;script type="text/javascript"&gt; document.getElementById("error_for_js").innerHTML = "Bilžu formāts nav derīgs! &lt;small&gt; GIF, JPEG, JPG, PNG ir autļauti.&lt;/small&gt;"; &lt;/script&gt; &lt;?php } } ?&gt; &lt;form enctype="multipart/form-data" method='post' action='' onsubmit='if(document.getElementById("titleeee").value.length &lt; 3 ) { document.getElementById("error_for_js").innerHTML = "Albūma nosaukumam ir jābūt garākam!"; return false; } else { return true; }' &gt; &lt;p id='error_for_js'&gt;&lt;/p&gt; Albūma nosaukums: &lt;input id='titleeee' type='text' name='album_title' /&gt;&lt;br /&gt; Bilde Nr 1: &lt;input type='file' name='pic_nr1' /&gt;&lt;br /&gt; Bilde Nr 2: &lt;input type='file' name='pic_nr2' /&gt;&lt;br /&gt; Bilde Nr 3: &lt;input type='file' name='pic_nr2' /&gt;&lt;br /&gt; Aktīvs*: &lt;select&gt; &lt;option&gt;Jā&lt;/option&gt; &lt;option&gt;Nē&lt;/option&gt; &lt;/select&gt;&lt;br /&gt; &lt;input type='submit' value='Pievienot' /&gt; &lt;/form&gt; </code></pre> <p>I dont understand why value of <code>id='error_for_js'</code> dont change if file format is wrong, i did the <code>getElementById('error_for_js').innerHTML = 'new value'</code>; but its not changing !? Ideas ?</p>
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    1. COyou're setting the value of the `p` tag before the document is even parsed.
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    2. COYour PHP condition expression does not work as you think, the `&` operator has a higher precedence than the `||` - add some brackets
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    3. COYou should not use JavaScript for that task. Why don't you echo the html directly with PHP?
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