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Susanta ChakrabortySusanta Chakraborty 

How to use urlfor function

How to use Urlfor function in the existing code
/apex/SDOC__SDCreate1?id={!Staff__c.Id}&Object=Staff__c
VinayVinay (Salesforce Developers) 
Hi Susanta,

Hope below link will help you.

https://salesforce.stackexchange.com/questions/24506/using-urlfor-to-refer-to-the-current-page-dynamically

Thanks,
VinayKumar
Susanta ChakrabortySusanta Chakraborty
Hi Vinay

Thanks for prompt reply but it didn't work. I am mentioning the VF page coding it will help you for further suggesstion 
<apex:page controller="SDOC.SDCreateController" 
tabStyle="SDOC__SDTemplate__c" standardstylesheets="true"
sidebar="{!sidebar}"
action="{!initStep1}"
title="{!tm['Generate Documents']}"
lightningStylesheets="true">

<!-- ================ START LIGHTNING_REDIRECT_PANEL ================ -->
<apex:outputPanel id="lightning_redirect_panel">
<script>
if( (typeof sforce != 'undefined') && sforce && (!!sforce.one) ) {
  if ('{!doLightningRedirect}' === 'true') {
    sforce.one.navigateToURL('{!lightningRedirectURL}', true);
  }
}
</script>
</apex:outputPanel>
<!-- ================= END LIGHTNING_REDIRECT_PANEL ================= -->

<!-- Must be included to use sforce.console.isInConsole() -->
<!-- Use version 30.0; isInConsole() doesn't work on version 40.0 -->
<apex:includeScript value="/support/console/30.0/integration.js"/>

<script type="text/javascript">
// Hide Salesforce header if showheader=false is included in URL
var hideHeader = function() {
  var salesforceHeader = document.getElementById('AppBodyHeader');
  if (salesforceHeader !== null) {
    salesforceHeader.style.display = 'none';
  }
}

var showHeader = '{!JSENCODE($CurrentPage.parameters.showHeader)}';
if (showHeader === 'false' || showHeader === '0') {
    hideHeader();
}
// End "Hide Salesforce header if showheader=false is included in URL"

// Hide Salesforce header if user is invoking S-Docs from Sales Console.
// This is finnicky as there are reported bugs with sforce.console.isInConsole();
// if this is the case, have the user include &showHeader=false in their S-Docs button. 
if (sforce.console.isInConsole()) {
    hideHeader();
}

var AgreementForm = document.getElementById("blur");
var ContainerElem = document.getElementById("StatusBox");
AlignToCenter(ContainerElem);
function AlignToCenter(Element)
{
var availableHeight = 0;
var availableWidth = 0;
if (Element.ownerDocument)
{
var docElement = Element.ownerDocument.documentElement;
availableHeight = parseInt(docElement.clientHeight);
if (availableHeight == "NaN") availableHeight = 0;

availableWidth = parseInt(docElement.clientWidth);
if (availableWidth == "NaN") availableWidth = 0;
}

if (availableHeight == 0 || availableHeight == "NaN")
availableHeight = window.screen.availHeight - 200;
if (availableWidth == 0 || availableWidth == "NaN")
availableWidth = window.screen.availWidth - 100;

var msgBoxTop = parseInt((availableHeight - parseInt(Element.clientHeight))/2);
var msgBoxleft = parseInt((availableWidth - parseInt(Element.style.width))/2);

if (msgBoxTop == "NaN" || msgBoxTop == 0)
msgBoxTop = 100;

Element.style.left = msgBoxleft + "px";
Element.style.top = msgBoxTop + window.pageYOffset + "px";
}

function reposition(){
if(navigator.appName == 'Window Internet Explorer') AgreementForm.style.top = document.body.scrollTop;
else AgreementForm.style.top = window.pageYOffset+"px";
//AlignToCenter(ContainerElem);
}
</script>
<apex:actionStatus id="statLoad">
    <apex:facet name="start">
        <div id="blur" style="position:absolute; left:1px; top:1px; width:100%; height:100%; text-align:center; vertical-align: middle; background-color: #dcdcdc; opacity:0.7;filter:alpha(opacity=70)">
        </div>
        <div id="StatusBox" style="position:absolute; left:50%; top:300px; width: 120px; height:50px; opacity:1;filter:alpha(opacity=100)">
        <table border="1" cellpadding="0" cellspacing="0" style="border-left-color: #336699;
        border-bottom-color: #336699; width: 120px; border-top-color: #336699; height:50px;
        border-right-color:#336699; background-color:#ffffff;">
        <tr>
        <td align="left" valign="top">
        <table border="0" cellpadding="4" cellspacing="0" style="width: 100%; height: 100%">
        <tr>
        <td style="border-bottom-color:#336699; border-bottom-width:0px; border-bottom-style:solid;vertical-align:middle;">
        <img src="{!URLFOR($Resource.SDoc,'spinner_large.gif')}"/></td>
        <td style="border-bottom-color:#336699; border-bottom-width:0px; border-bottom-style:solid;vertical-align:middle;color:darkred;font-size:11pt;font-weight:bold;">
        &nbsp;{!tm['Loading']}...</td>
        </tr>
        </table>
        </td>
        </tr>
        </table>
        </div>
    </apex:facet>
</apex:actionStatus>

<apex:sectionHeader title="{!tm['Create S-Docs']}" subtitle="{!tm['Generate Documents']}"/>
<apex:form >
<script type="text/javascript">
      function doSearch() {
        searchServer(
          document.getElementById("{!$Component.searchText2}").value,
          document.getElementById("{!$Component.searchcategories}").options[document.getElementById("{!$Component.searchcategories}").selectedIndex].value
          );
      }
      </script> 

      <apex:actionFunction name="searchServer" action="{!initStep1}" rerender="panel3g" status="panel3gStatus">
          <apex:param name="txtValue" value=""/>
      </apex:actionFunction>  
      
<apex:pageMessages />
        <apex:outputPanel id="backnav" rendered="{!$User.UIThemeDisplayed !='Theme4t'}">
            <span class="style6">&lt;&lt;</span>
        <apex:commandLink action="{!returnToObj}" value="{!tm['Back']}"/> 
    </apex:outputPanel>
<br></br><br></br>
                <apex:panelGroup >
                     <apex:outputLabel for="searchcategories">{!tm['Search in']} &nbsp;</apex:outputLabel>
                     <apex:selectList id="searchcategories" size="1" value="{!docCategory}">
                        <apex:selectOptions value="{!docCategories}"/>
                        <apex:actionSupport event="onchange"  action="{!initStep1}" rerender="panel3g" status="panel3gStatus"/>
                    </apex:selectList>
                    <apex:outputLabel for="searchText2"> {!tm['for :']} &nbsp;</apex:outputLabel>
                        <apex:inputText id="searchText2" value="{!searchText2}" onkeyup="doSearch();"/>
                        <apex:commandButton value="{!tm['Search']}" action="{!initStep1}" rerender="panel3g" status="panel3gStatus">
                            <apex:param name="txtValue" value="{!searchText2}"/>
                        </apex:commandButton>
                    <apex:actionStatus id="panel3gStatus">
                        <apex:facet name="start">
                            <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Searching...']}
                        </apex:facet>
                    </apex:actionStatus>
                </apex:panelGroup>
                <br/>
                <br/>
                <apex:panelGroup rendered="{!JSENCODE($CurrentPage.parameters.AFPicklist) != 'false'}">
                    <apex:dataTable value="{!filterOptionsList}" var="filter">
                        <apex:column >
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'PICKLIST'}">
                                <apex:outputLabel for="filterCategoriesPicklist"> Filter on <b>{!filter.label}</b> for : &nbsp;</apex:outputLabel>
                            </apex:outputPanel>
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'MULTIPICKLIST'}">
                                <apex:outputLabel for="filterCategoriesMultiPicklist"> Filter on <b>{!filter.label}</b> for : &nbsp;</apex:outputLabel>
                            </apex:outputPanel>
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'BOOLEAN'}">
                                <apex:outputLabel for="filterCategoriesBool"> Filter on <b>{!filter.label}</b> for : &nbsp;</apex:outputLabel>
                            </apex:outputPanel>
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'STRING' || filter.fieldType == 'TEXTAREA'}">
                                <apex:outputLabel for="filterCategoriesString"> Filter on <b>{!filter.label}</b> for : &nbsp;</apex:outputLabel>
                            </apex:outputPanel>
                        </apex:column>
                        <apex:column >
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'PICKLIST'}">
                                <apex:selectList id="filterCategoriesPicklist" size="1" value="{!filter.filterOption}">
                                    <apex:selectOptions value="{!filter.possibleOptions}"/>
                                    <apex:actionSupport event="onchange"  action="{!initStep1}" 
                                    rerender="panel3g" status="panel3gStatus"/>
                                </apex:selectList>
                                <apex:actionStatus id="panel3gfilterPLStatus">
                                    <apex:facet name="start">
                                        <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Searching...']}
                                    </apex:facet>
                                </apex:actionStatus>
                            </apex:outputPanel>
                            <apex:outputPanel layout="block" rendered="{!filter.fieldType == 'MULTIPICKLIST'}">
                                <apex:selectList id="filterCategoriesMultipicklist" value="{!filter.filterOptionList}" multiselect="true" size="{!IF(filter.possibleOptions.size > 5, 5, filter.possibleOptions.size)}" style="width:130px;">
                                    <apex:selectOptions value="{!filter.possibleOptions}"/>
                                    <apex:actionSupport event="onchange"  action="{!initStep1}" 
                                    rerender="panel3g" status="panel3gStatus"/>
                                </apex:selectList>
                                <apex:actionStatus id="panel3gfilterMPLStatus">
                                    <apex:facet name="start">
                                        <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Searching...']}
                                    </apex:facet>
                                </apex:actionStatus>
                            </apex:outputPanel>
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'BOOLEAN'}">
                                <apex:selectList id="filterCategoriesBool" size="1" value="{!filter.filterOption}">
                                    <apex:selectOptions value="{!filter.possibleOptions}"/>
                                    <apex:actionSupport event="onchange"  action="{!initStep1}" 
                                    rerender="panel3g" status="panel3gStatus"/>
                                </apex:selectList>
                                <apex:actionStatus id="panel3gfilterBStatus">
                                    <apex:facet name="start">
                                        <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Searching...']}
                                    </apex:facet>
                                </apex:actionStatus>
                            </apex:outputPanel>
                            <apex:outputPanel layout="none" rendered="{!filter.fieldType == 'STRING' || filter.fieldType == 'TEXTAREA'}">
                                <apex:inputText id="filterCategoriesString" value="{!filter.filterOption}">
                                    <apex:actionSupport event="onkeyup"  action="{!initStep1}" 
                                    rerender="panel3g" status="panel3gStatus"/>
                                </apex:inputText>
                                <apex:actionStatus id="panel3gfilterSStatus">
                                    <apex:facet name="start">
                                        <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Searching...']}
                                    </apex:facet>
                                </apex:actionStatus>
                            </apex:outputPanel>
                        </apex:column>
                    </apex:dataTable>
                </apex:panelGroup>
<br></br><br></br>
<apex:pageBlock title="{!selectDocsClickNxtStep}">
<table width="100%">
<tr valign="top">
<td> 
    <apex:pageBlockSection columns="1" collapsible="false">
            <apex:pageBlockSectionItem >
                <apex:panelGroup id="panel3g">
                    <apex:outputText >&nbsp;&nbsp;&nbsp;&nbsp;
                         <img src="{!URLFOR($Resource.SDoc,'checkbox_arrow.png')}" />
                        <apex:commandButton action="{!step2}" value="{!btnTxtStep2}" styleClass="btn"
                          rendered="{!NOT(lightningNav)}" />
                        <apex:commandButton action="{!step2}" value="{!btnTxtStep2}" styleClass="btn"
                          rendered="{!lightningNav}" reRender="lightning_redirect_panel" />
                    </apex:outputText>
                    <apex:outputpanel style="overflow:scroll;height:250px;" layout="block">
                    <apex:pageBlockTable value="{!docsList}"  var="c" rendered="{!NOT(ISNULL(docsList))}">
                        <apex:column width="25px">
                            <apex:inputCheckbox value="{!c.checked}">
                            <apex:actionsupport event="onclick" action="{!addDoc}" rerender="panel4g" status="statLoad" />
                            </apex:inputCheckbox>
                        </apex:column>
                        <apex:column headerValue="{!tm['Name']}"><img src='{!c.formatIconImgSrc}' border='0' />
                        &nbsp;&nbsp;<apex:outputText value="{!c.t.Name}"/></apex:column>

                        <apex:column width="32px"> <!-- Container if e-vender value = s-sign -->
                        <apex:outputPanel rendered="{!c.t.SDOC__E_Sign_Vendor__c == 'SSIGN'}">
                            <b><img width="32" src="{!URLFOR($Resource.SDoc,'s-sign_logo.png')}" /></b>
                        </apex:outputPanel>
                        </apex:column>

                        <apex:column width="32px"> <!-- Container if allow edit value = true -->
                        <apex:outputPanel rendered="{!c.t.SDOC__Allow_Edit__c}">
                            <b><img src='/img/icon/custom51_100/pencil16.png' alt='Edit' border='0'/></b>
                        </apex:outputPanel>
                        </apex:column>

                        <apex:column value="{!c.t.SDOC__Description__c}" headerValue="{!tm['Description']}"/>

                        <apex:column value="{!c.t[additionalFields[0]]}" headerValue="{!additionalFieldsLabels[0]}" 
                        rendered="{!(numberOfAdditionalFields > 0)}"/>
                  <apex:column value="{!c.t[additionalFields[1]]}" headerValue="{!additionalFieldsLabels[1]}" 
                        rendered="{!(numberOfAdditionalFields > 1)}"/>
                        <apex:column value="{!c.t[additionalFields[2]]}" headerValue="{!additionalFieldsLabels[2]}" 
                        rendered="{!(numberOfAdditionalFields > 2)}"/>
                        <apex:column value="{!c.t[additionalFields[3]]}" headerValue="{!additionalFieldsLabels[3]}" 
                        rendered="{!(numberOfAdditionalFields > 3)}"/>
                        <apex:column value="{!c.t[additionalFields[4]]}" headerValue="{!additionalFieldsLabels[4]}" 
                        rendered="{!(numberOfAdditionalFields > 4)}"/>
                    </apex:pageBlockTable>
                    </apex:outputpanel> 
                    <apex:outputText rendered="{!recordCount>99}">
                        <b>[More Available - Use Search criteria to limit results]</b>
                    </apex:outputText>
                </apex:panelGroup>
            </apex:pageBlockSectionItem>
    </apex:pageBlockSection>
</td><td></td>
<td>
    <apex:panelGroup id="panel4g">
        <apex:pageBlockSection title="{!tm['Selected Documents']}" columns="1" collapsible="false" rendered="{!hasSelectedDocs}">
             <apex:pageBlockSectionItem >
                    <apex:pageBlockTable value="{!selectedDocs}" var="ca" columnsWidth="50px, *" cellpadding="0" cellspacing="0">
                        <apex:column headerValue="{!tm['Remove']}">
                                <apex:commandLink value="X" action="{!removeDoc}" styleClass="btn" rerender="panel4g, panel3g" status="panel4Status">
                                    <apex:Param name="tid" value="{!ca.t.ID}" />
                                </apex:commandLink>
                        </apex:column>
                        <apex:column width="25px" headerValue="{!tm['Create Task']}">
                            <apex:inputCheckbox value="{!ca.taskCreate}" rendered="{!ca.t.SDOC__Task_Auto_Create__c}"
                                         disabled="{!ca.t.SDOC__Task_Auto_Create_Default__c=='Checked2'}">
                                    <apex:actionsupport event="onclick" action="{!addDoc}" rerender="panel4g, panel3g" status="panel4Status" />
                            </apex:inputCheckbox>
                            <apex:outputPanel rendered="{!ca.t.SDOC__Task_Auto_Create_Default__c=='Checked2'}">
                                <img src='/img/func_icons/util/lock12.gif'/>
                            </apex:outputPanel>
                        </apex:column>
                        <apex:column headerValue="{!tm['Name']}"><img src='{!ca.formatIconImgSrc}' border='0' />
                        &nbsp;&nbsp;<apex:outputText value="{!ca.t.Name}"/></apex:column>
                    </apex:pageBlockTable>
                </apex:pageBlockSectionItem>
        </apex:pageBlockSection>
    </apex:panelGroup>
    <apex:actionStatus id="panel4Status">
        <apex:facet name="start">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <img src="{!URLFOR($Resource.SDoc,'spinner.gif')}" /> {!tm['Updating...']}
        </apex:facet>
    </apex:actionStatus>    
</td>
</tr>
<tr>
    <td width="65%"></td>
    <td width="5%"></td>
    <td width="30%"></td>
</tr>
</table>
&nbsp;&nbsp;&nbsp;&nbsp;
<apex:commandButton action="{!step2}" value="{!btnTxtStep2}" styleClass="btn"
  rendered="{!NOT(lightningNav)}" />
<apex:commandButton action="{!step2}" value="{!btnTxtStep2}" styleClass="btn"
  rendered="{!lightningNav}" reRender="lightning_redirect_panel" />
</apex:pageBlock>

</apex:form>
</apex:page>
Additionally mentioning the error msg which shows while click on preview option of the VF page
 
Attempt to de-reference a null object
Error is in expression '{!initStep1}' in component <apex:page> in page sdoc:sdcreate1: (SDOC)
An unexpected error has occurred. Your solution provider has been notified. (SDOC)

I really can't understand what to do....