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how to create dropdown to filter other dropdow
example
dropdown1 :
<select name='datatype'>
<option='char'>char</option>
<option='int'>int</option>
<option='decimal'>decimal</option>
</select>
dropdown2 :
<select name='contenttype'>
<option='char'>abc</option>
<option='char'>DEF</option>
<option='int'>123</option>
<option='int'>456</option>
<option='decimal'>1.23</option>
<option='decimal'>4.56</option>
</select>