jsf - displaying values from database on the basis of dropdown menu selction -

-

hi creating jsf application . in fact made dropdown list , want display results according value selected dropdown. if can help.... thanks

here drop down

<h:form>                 <h:commandbutton action="sample?faces-redirect=true" value="submit">                     <h:selectonemenu id="samplesearch" value="#{cbean.id}">                     <f:selectitem id="id" itemlable="idtext" itemvalue="by text" />                     <f:selectitem id="idnumeric" itemlable="idnumeric" itemvalue="number" />                     <f:selectitem id="product" itemlable="product" itemvalue="main product" />                     <f:selectitem id="lonumber" itemlable="lonumber" itemvalue="lonumber" />                     <f:selectitem id="formula" itemlable="formula" itemvalue="by formula" />                     </h:selectonemenu>                 </h:commandbutton>              </h:form>

first, you're not allowed nest <h:selectonemenu> component(s) within <h:commandbutton>! here's proper structure of <h:form>

<h:form>     <h:commandbutton action="sample?faces-redirect=true" value="submit" />         <h:selectonemenu id="samplesearch" value="#{cbean.id}">             <f:selectitem id="id" itemlable="idtext" itemvalue="by text" />             <f:selectitem id="idnumeric" itemlable="idnumeric" itemvalue="number" />             <f:selectitem id="product" itemlable="product" itemvalue="main product" />             <f:selectitem id="lonumber" itemlable="lonumber" itemvalue="lonumber" />             <f:selectitem id="formula" itemlable="formula" itemvalue="by formula" />     </h:selectonemenu> </h:form>

then, in order dropdown list options database, can consider using <f:selectitems> component (and rid of <f:selectitem>s) , pass list<t> managed bean components value property.

the selectonemenu this:

<h:selectonemenu value="#{cbean.id}">     <f:selectitems value="#{cbean.values}"                     var="item"                    itemlabel="#{item.label}"                    itemvalue="#{item.value}"/> </h:selectonemenu>

as managed-bean, it's supposed provide public list<t> getvalues() method, return list objects populate dropdown.

when t complex java object, such item has string property of label , value, use var attribute hold of iteration variable in turn can use in itemvalue and/or itemlabel attribtues (if omit itemlabel, label becomes same value).

let's say:

@managedbean @requestscoped public class cbean {     public list<item> getvalues() {         list<item> result = new arraylist<item>();         //..call-back web-service, db, etc. , populate result variable.         return result;     } }

the item class this:

public class item {    private string label;    private string value;     //getters, setters. }

you can read more here:


Comments

Post a Comment

Popular posts from this blog

java - activate/deactivate sonar maven plugin by profile? -

-
i use sonar plugin executes if activated in maven profile. sonar runs on every compile. the problem build fail other team members not have sonar application installed locally. pom.xml checked in team members same copy including sonar configuration, don't want them modify purpose of disabling sonar (they might inadvertently check modified copy in). please advise how configure maven (.m2/settings.xml) and/or pom.xml sonar feature can enabled/disabled local profile. here sonar configuration in each project's pom.xml: <plugin> <groupid>org.codehaus.mojo</groupid> <artifactid>sonar-maven-plugin</artifactid> <version>1.0</version> <executions> <execution> <id>make-sonar</id> <phase>compile</phase> <goals> <goal>sonar</goal> </goals> </execution> </executions> ...
Read more

python - TypeError: can only concatenate tuple (not "float") to tuple -

-
i'm new python, question might easy, anyway, patience: as trying call newton-raphson method calculate implied volatility in black-scholes formula call/put option pricing, first thing is, newton method in scipy.optimize seems calculate function's zeros, in black-scholes formula, want function's value option price, not zero. (i'm new here programming, i'm not sure techniques.) should write function things like: def f(sigma, price): return bsformula(s0,k,r,t,q,sigma) - price then, while calling newton method, takes args=() 1 parameter in function, write this: value = newton(bsprice2, 0.5, args=price) but error message: file "bs.py", line 36, in bsimpvol value = newton(bsprice2, 0.5, args=float(price)) file "/usr/lib/python2.7/dist-packages/scipy/optimize/zeros.py", line 143, in newton q0 = func(*((p0,) + args)) typeerror: can concatenate tuple (not "float") tuple could tell me why that? how fix it? apprecia...
Read more

java - What is the difference between String. and String.this. ? -

-
this question has answer here: meaning of .this , .class in java 2 answers i'll straight point. im still learning bit of syntax , want know difference between code is code a: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.valueof(i))); } } please ignore fact i undeclared, not lost. code b: public class buttonz extends jbutton{ public buttonz(){ settext(new string(string.this.charat(i))); } } what don't yet understand difference in typing string.this , string. i under assumption when use dot operator on class accessing it's static methods(and/or variables if they're not hidden). i have studied little bit , have concluded when using string. accessing string static methods.. when using string.this. i'm accessing methods class buttonz extendi...
Read more