How to get the selected option from p:selectOneRadio using javascript

问题

How do you get which radio is selected within p:selectOneRadio using javascript/jquery ?

Since the p:selectOneRadio uses no radio tags I have no idea how to get the checked option using CSS selectors.

    <p:selectOneRadio onchange="reactToChangedRadio()" >
              <f:selectItem itemLabel="....." itemValue="..." />
              <f:selectItem itemLabel="....." itemValue="..." />
              <f:selectItem itemLabel="....." itemValue="..." />
    </p:selectOneRadio>

回答1:

You can use the jquery solution or choose a simple javascript solution:

document.getElementById("myFormId:mySelectId")[0].checked

See the post from CodeRanch: http://www.coderanch.com/t/210871/JSF/java/selectOneRadio-javascript-value

UPDATE: I must admit that I'm in a dept, and I'm sorry for that but yesterday I haven't had much time...

I must say that I haven't been able to get the radio value in the old fashioned javascript way:

                 <script type="text/javascript">
                      /*  <![CDATA[ */

                        function reactToChangedRadio(){
                           alert("I'm in!");
                           var myval;
                            for(i=0;i<3;i++){
                                    if(document.forms['myFormId']['myFormId:myRadio'][i].checked == true ){
                                        myval = document.forms['myFormId']['myFormId:myRadio'].text/value;
                                    }
                                }
                                alert( "val = " + myval );
                        }
                    /*    ]]> */
                </script>

On the other hand, this hard-coded solution works:

                 <script type="text/javascript">
                      /*  <![CDATA[ */

                        function reactToChangedRadio(){
                           alert("I'm in");
                           var myval;
                           if(document.forms['myFormId']['myFormId:myRadio'][0].checked == true ){
                              myval = "first button";
                           }else if(document.forms['myFormId']['myFormId:myRadio'][1].checked == true ){
                              myval = "second button";
                           }else if(document.forms['myFormId']['myFormId:myRadio'][2].checked == true ){
                              myval = "third button";
                           }

                           alert( "val = " + myval );
                        }
                    /*    ]]> */
                    </script>

,but of course, because of Primefaces power, there is a server side solution(using ReuqestContext component):

                 <h:form id="myFormId">
                        <p:selectOneRadio id="myRadio" value="#{handleFiles.radioVal}" >
                            <p:ajax event="change" oncomplete="handleComplete(xhr, status, args)" listener="#{handleFiles.testMethod}" />
                            <f:selectItem itemLabel="1" itemValue=" first" />
                            <f:selectItem itemLabel="2" itemValue=" second" />
                            <f:selectItem itemLabel="3" itemValue=" third" />
                        </p:selectOneRadio>
                    </h:form>
<script type="text/javascript">
 function handleComplete(xhr, status, args) {  
    alert("Selected Radio Value" + args.myRadVal);  
 } 
</script>

The server side code:

private String radioVal;

public String getRadioVal() {
    return radioVal;
}

public void setRadioVal(String radioVal) {
    this.radioVal = radioVal;
}

public void test(){
    RequestContext context = RequestContext.getCurrentInstance();  
    context.addCallbackParam("myRadVal", radioVal);
    System.out.println("radioVal: "+radioVal);
}

the ReuqestContext component can be found here: http://www.primefaces.org/showcase-labs/ui/requestContext.jsf (only for PF 3)

回答2:

The problem could be solved easily with jquery find() by using getJQ method of the pf widget:

<p:selectOneRadio ... widgetVar="mySelectName" .../>

we can obtain current value by calling:

PF('mySelectName').getJQ().find(':checked').val();

回答3:

If you just need the value of selected item in JS you can call your function with this.value parameter. Look inside PF generated HTML:

<input id="{component_id}:{index}" name="{component_id}" type="radio" value="{itemValue}"
    checked="checked" onchange="reactToChangedRadio(this.value);">
...

for each selectItem. Hence this.value works perfectly, no need to search for checked:

<script>
    function reactToChangeRadio(par){
        alert('Value of selected item is: ' + par);
    }
</script>

<p:selectOneRadio onchange="reactToChangedRadio(this.value);" >
          <f:selectItem itemLabel="....." itemValue="..." />
          <f:selectItem itemLabel="....." itemValue="..." />
          <f:selectItem itemLabel="....." itemValue="..." />
</p:selectOneRadio>

Or you can pass this.id into function to use it in jQuery selector.

回答4:

you have yo use the :checked pseudo selector: More info here: http://api.jquery.com/checked-selector/

 $(":checked")

回答5:

All you need to do is to disable all radio buttons except the one that was checked like:

<h:selectOneRadio id="rad" ... onclick="dataTableSelectOneRadio(this)" >
  <f:selectItems .... />
</h:selectOneRadio>

And here is your script:

function dataTableSelectOneRadio(radio){
      var id = radio.name.substring(radio.name.lastIndexOf(':'));
      var temp = radio.name.lastIndexOf(':') - 1;
      var index = radio.name.substring(temp,temp+1);
      var el = radio.form.elements;

       for(var i = 0 ; el.length; i++)
       {
          if(el[i].name.substring(el[i].name.lastIndexOf(':')) == id) {
              if(el[i].name.indexOf(index) != -1)
                  el[i].check = true;
              else
                   el[i].check = false;

           }
       }

}

回答6:

There is a one-line solution to this question that also handles the case where you have multiple selectOneRadio inputs on a page.

If your form is called myForm, and your selectOneRadio input has the id myRadio, then the following line will get the selected value:

$('[id^=myForm\\:myRadio]:checked').val()

This works because all the internal inputs are given an id beginning with myForm:myRadio. The line above finds all entities beginning with that string, and selects only the checked ones. Since only one radio button can be checked a a time, this gives the selected radio button. Then we can simply grab its value.

来源：https://stackoverflow.com/questions/8385591/how-to-get-the-selected-option-from-pselectoneradio-using-javascript

标签

jsf

primefaces

selectoneradio