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POchange input size depending on option selected
 

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    <p>I've seen similar questions posted and tried to change them to meet my needs but I don't know enough about javascript to do it. All I want to do is limit a form input to 2 characters if they select "state" as their search option. This is what I have:</p> <pre><code>function changeValue(){ var option=document.getElementById('searchtype').id; if (option == ("A") || ("B") ){ document.getElementById('field').size="40"; } else if(option=="C"){ document.getElementById('field').size="2"; &lt;form action="results.php" method="post"&gt; Search By:&lt;br /&gt; &lt;select id="searchtype" name="searchtype" onchange="changeValue();"&gt; &lt;option id="A" value="name"&gt;Hospital Name&lt;br /&gt;&lt;/option&gt; &lt;option id="B" value="city"&gt;City&lt;/option&gt; &lt;option id="C" value="state"&gt;State&lt;/option&gt; &lt;/select&gt; &lt;br /&gt;&lt;br /&gt; Search:&lt;br /&gt; &lt;input id="field" name="searchterm" type="text" size="0"&gt; </code></pre> <p>Am I doing something wrong or is there a better way to do this?</p> <p>I used Jack's code below and added a field.size attribute so my input matched the max allowed characters: (thanks Jack)</p> <pre><code>script type="text/javascript"&gt; function changeValue(dropdown) { var option = dropdown.options[dropdown.selectedIndex].value, field = document.getElementById('field'); if (option == 'name' || option == 'city') { field.maxLength = 40; field.size = 40; } else if (option == 'state') { field.value = field.value.substr(0, 2); field.maxLength = 2; field.size = 2; } } &lt;/script&gt; &lt;h1&gt;Hospital Search&lt;/h1&gt; &lt;form action="results.php" method="post"&gt; Search By:&lt;br /&gt; &lt;select id="searchtype" name="searchtype" onchange="changeValue(this);"&gt; &lt;option id="name" value="name"&gt;Hospital Name&lt;br /&gt;&lt;/option&gt; &lt;option id="city" value="city"&gt;City&lt;/option&gt; &lt;option id="state" value="state"&gt;State&lt;/option&gt; &lt;/select&gt;&lt;br /&gt; Search:&lt;br /&gt; &lt;input id="field" name="field" type="text" size="40"&gt; &lt;/input&gt; </code></pre> <p>After deciding a dropdown with a list of states would be better, I changed it to this:</p> <pre><code>&lt;form action="results.php" method="post"&gt; Hospital Name:&lt;br /&gt; &lt;input name="searchterm_name" type="text" size="40"&gt; &lt;br /&gt; &lt;input type="submit" name="submit" value="Search"&gt; &lt;/form&gt;&lt;br /&gt; &lt;form action="results.php" method="get"&gt; City Name:&lt;br /&gt; &lt;input name="searchterm_city" type="text" size="40"&gt;&lt;br /&gt; &lt;select name="select_state"&gt; &lt;option value=""&gt;None &lt;option value="AL" Selected&gt;Alabama &lt;option value="AK"&gt;Alaska &lt;option value="AZ"&gt;Arizona &lt;/SELECT&gt; &lt;input type="submit" name="submit" value="Search"&gt; &lt;/form&gt; </code></pre> <p>ED: Using form method "post" caused the browser to throw a warning every time I hit the back button to get to the results page. I changed to "get" since the information is not sensitive and now it goes back w/o warning.</p>
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    1. COonchange of dropdown, you don't want to clear text box?
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    2. COYeah I suppose I probably would. I also just realize I should probably just give them a dropdown menu of states to choose from like most sites
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