How to communicate back and forth between client and server-side in JSF? -


most of problems in jsf, far, seem boil down - communication (static) client-side (dynamic) server-side, , vice-versa; instance, re-rendering components.

an example: enabling/disabling button (commandbutton) depends on selection of selectoneradio.

what correct way communicate selection of selectoneradio (client server) , ajaxingly updating commandbutton (server client)?

by using <f:ajax>.

here's example enables button when second item selected.

<h:selectoneradio value="#{bean.selecteditem}">     <f:selectitem itemvalue="1" itemlabel="first item" />     <f:selectitem itemvalue="2" itemlabel="second item" />     <f:ajax render="button" /> </h:selectoneradio> <h:commandbutton id="button" disabled="#{bean.selecteditem != 2}" />

make sure #{bean} @viewscoped 1 state remembered across postbacks. else it'll fall default values when press submit button.

that said, recommend go through decent jsf book. above covered in 1st chapter.


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