How to use Javascript in visualforce page

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Here I am taking a basic example of using Javascript in a visualforce page that illustrates how to call javascript function from VF page and how to reference id of a visualforce component.

Use $component global variable to referencing DOM Id that is generated for a visualforce component.


<apex:page>

  <script>
      function show(tid,sec){
         
          document.getElementById(sec).value = document.getElementById(tid).value;       
      }
         
  </script>
  <apex:form >
      <apex:pageBlock >
          <apex:pageBlockSection id="lab" >
              <apex:inputText id="name" label="AccountName"/>
              <apex:inputText id="second" label="Rating"/>
              <apex:commandButton value="Go" onclick="show('{!$Component.name}','{!$Component.second}')" reRender="lab"/>
          </apex:pageBlockSection>
      </apex:pageBlock>
  </apex:form>
</apex:page>

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