In JSF, <h:selectManyMenu /> tag is used to render a multiple select dropdown box – HTML select element with “multiple” and “size=1” attribute.

//JSF...
<h:selectManyMenu value="#{user.favCoffee1}">
   	<f:selectItem itemValue="Cream Latte" itemLabel="Coffee3 - Cream Latte" />
   	<f:selectItem itemValue="Extreme Mocha" itemLabel="Coffee3 - Extreme Mocha" />
   	<f:selectItem itemValue="Buena Vista" itemLabel="Coffee3 - Buena Vista" />
</h:selectManyMenu>
 
//HTML output...
<select name="j_idt6:j_idt8" multiple="multiple" size="1">	
	<option value="Cream Latte">Coffee3 - Cream Latte</option>
	<option value="Extreme Mocha">Coffee3 - Extreme Mocha</option>
	<option value="Buena Vista">Coffee3 - Buena Vista</option>
</select>

However, the use of h:selectManyMenu tag is highly NOT recommended, because they do not display consistently in different internet browsers, see figures :

1. Internet Explorer 8

A tiny scroll bar to manipulate the dropdown box values.

jsf2-selectManyMenu-IE-example

2. FireFox 3.6.10

No scroll bar, look like a normal “textbox”, but you can click on the “textbox” and “drag up or down” or “key up and down” to manipulate the value.

jsf2-selectManyMenu-FireFox-example

3. Google Chrome 6.0.472.63

In Google Chrome, both << select element with "multiple" and size="1" attribute - "h:selectManyMenu” tag >> and << select element with "multiple" and size="total of records" attribute - "h:selectManyListbox” tag >> are display the exact layout.

jsf2-selectManyMenu-Chrome-example

Conclusion

Just forget about “h:selectManyMenu” tag, there is really no reason to use it. The “h:selectManyListbox” tag is a good alternative.

Reference

  1. JSF <h:selectManyMenu /> JavaDoc
  2. JSF 2 h:selectManyListbox example
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