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POError javascript function to get value out of static php drop down
 

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  1. POError javascript function to get value out of static php drop down
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    <p>I made the dropdown with PHP which works fine. When the selected item changes, I call the function changePeriod().</p> <pre><code>$options[0] = '--period--'; $options[1] = 'Daily'; $options[2] = 'Weekly'; $options[3] = 'Monthly'; &lt;td&gt;&lt;?php echo form_dropdown('period', $options, '0', 'id="period" onchange="changePeriod()"'); ?&gt;&lt;/td&gt; </code></pre> <p>Here you can see the HTML source code which is a result of the code above. </p> <pre><code>&lt;td&gt; &lt;select name="period" id="period" onchange="changePeriod()"&gt; &lt;option value="0" selected="selected"&gt;--period--&lt;/option&gt; &lt;option value="1"&gt;Daily&lt;/option&gt; &lt;option value="2"&gt;Weekly&lt;/option&gt; &lt;option value="3"&gt;Monthly&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; </code></pre> <p>In this function I need to get the value of the selected item, but the 2 alerts above the switch both give <strong>Undefined</strong> as a result. Does anyone has an idea why I get undefined and not the values of the selected option? It worked with a dynamic dropdown filled with a foreach from the database. </p> <pre><code>function changePeriod() { alert(document.getElementById("period").selectedIndex); alert(document.getElementById("period").value); switch (document.getElementById("period").selectedIndex) { case 1: alert("daily"); break; case 2: alert("weekly"); break; case 3: alert("monthly"); break; } } </code></pre> <p><strong>Basically:</strong> Why can't I get the values of the selected option and how can I fix it?</p> <p>Thanks for helping.</p>
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    1. USLewis
    1. USLewis
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    1. COWhy you are not using jQuery?
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      1. POError javascript function to get value out of static php drop down
      1. USOğuzhan Eroğlu
    2. COWhat's the HTML generated by `form_dropdown()`?
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      1. USbfavaretto
    3. COcan you show us what the form_dropdown function looks like, and would be good to examine the form via DeveloperTools or similar (depending on your browser) to make sure the period id is being correctly injected into the DOM
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      1. POError javascript function to get value out of static php drop down
      1. USOffbeatmammal
 

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