Writing and calling java function in Visualforce Page

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Write down Java function inside <body> and <script> tags and inside your page tag <apex:page>

The page will look like this
<apex:page standardController="PV_Watts__c" id="pg" extensions="CustomRestClass">
      <apex:form id="frm">
<apex:outputpanel id="outpanel"  >
            <apex:pageBlock title="Calculate Total Production" id="pgBlock1" >
            
            <apex:pageBlockSection id="header" >
            <apex:commandButton value="Save" action="{!save}" id="saveButton" r
eRender="outpanel"/>
            </apex:pageBlockSection>
            <apex:pageBlockSection title="Array 1" id="pbSec1"  > 
            <apex:inputField id="A1_shade" value="{!PV_Watts__c.A1_Shade__c}"/>
           <apex:outputField id="sysLoss" value="{!PV_Watts__c.PV_A1_System_Losses__c}"/>






<!-- java funcation is called here on onclick-->
<apex:commandButton onclick="calSysLoss1(); return false;" value="Calculate System Losses" 
rerender="pbSec1"  / >
     
                 </apex:pageBlockSection>


<!---Java function would be like this -->




<body>


<script>


function calSysLoss(){


                        var j$ = jQuery.noConflict()
                        var shade=j$("[id$='A1_shade']").val();
                        var sysLossOutput = (( 1- ( 1 - 0.02 ) * ( ( (Discount)/100 )) * 
                                              ( 1 - 0.02 ) * ( 1 - 0.02 ) * 
                                              ( 1 - 0.005 ) * ( 1 - 0.015) * 
                                              ( 1- 0.01 ) * ( 1 - 0.03) )* 100).toFixed(2);
document.getElementById("{!$Component.frm.pgBlock1.pbSec1.sysLoss}").innerHTML=sysLossOutput;




}


</script>


</body>


















































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