Hai..............

                  I created Dynamic search page with custom object (applicant) having fields firstname,skillset(text datatype), expected annual salary(currency data type)  ,location(text data type) etc.......

 i got the table with all the field values.But the thing is when i enter the values in the input field ,the query is not exectuing can any one help me .............

 I think  the values are not passing from javascript to controller...............

Here is my Controller code....

public with sharing class SearchapplicantsController {   
    
    private String soql {get;set;}
    // the collection of contacts to display
      Public List<Applicant__c>  applicants {get;set;}
    // the current sort direction. deaults to asc
      public String sortDir{
      get { if (sortDir == null) { sortDir = 'asc'; } 
             return sortDir;
             }
             set;
             }
    // the current field to sort by. defaults to last name 
        public String sortField {
          get {
                if  ( sortField == null) {
                sortField = 'First_Name__c'; } return sortField; }
                set;
                }
      // format the soql for display on the visualforce page 
           public String debugSoql {
              get { return soql + ' order by ' + sortField + ' ' + sortDir + 'limit 20 '; }
               set;
               }
      // init the contrller and display some sample data when the page loads
          public SearchapplicantsController() {
            soql='select First_name__c,Skill_set__c,Experience__c,Qualification__c,Expected_Annual_Salary__c,Location__c from Applicant__c  where Applicant__c.First_name__c != null ';    
                   runQuery();
                   }
        // toggles the sorting  of query from asc<-->desc
            public void toggleSort() {
              //simply toggle the direction  
                   sortDir = sortDir.equals('asc') ? 'desc' : 'asc' ;
                  // run the query again
                    runQuery();
                    }             
        //runs the actualquery
           public void runQuery() {
              try {
                   applicants  = Database.query(soql + ' order by ' + sortField + ' ' + sortDir + ' limit 20 ');
                    }
                    catch (Exception e) {
                     ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.ERROR, ' OOOps! ') );
                     }
                   }                                
    // runs the search with parameters passed via JavaScript
      public PageReference runSearch(){
      
      
          String FirstName = Apexpages.currentPage().getParameters().get('First_Name__c');
    String Skillset = Apexpages.currentPage().getParameters().get('Skill_set__c');
    String Experience = Apexpages.currentPage().getParameters().get('Experience__c');
    String ExpectedSalary = Apexpages.currentPage().getParameters().get('Expected_Annual_Salary__c');
String Location = Apexpages.currentPage().getParameters().get('Location__c');
String Qualification = Apexpages.currentPage().getParameters().get('Qualification__c');

 
    soql='select First_name__c,Skill_set__c,Experience__c,Qualification__c,Expected_Annual_Salary__c,Location__c from Applicant__c where Applicant__c.First_name__c != null' ;    

    if (!FirstName.equals(''))
      soql += ' and First_Name__c LIKE \''+String.escapeSingleQuotes(FirstName)+'%\'';
    if (!Skillset.equals(''))
      soql += ' and Skill_Set__c LIKE \''+String.escapeSingleQuotes(Skillset)+'%\'';
    if (!Experience.equals(''))
      soql += ' and Experience__c LIKE \''+String.escapeSingleQuotes(Experience)+'%\'';  
    if (!ExpectedSalary.equals(''))
      soql += ' and Expected_Annual_Salary__c LIKE  \''+String.escapeSingleQuotes(Expectedsalary)+'%\' ';
if (!Qualification.equals(''))
      soql += ' and Qualification__c LIKE (\' '+Qualification+'\')';
 
    // run the query again
    runQuery();
 
    return null;
  }
 
  // use apex describe to build the picklist values
  public List<String> Qualification {
    get {
      
      
      
      if (Qualification == null) {
 
        Qualification = new List<String>();
        Schema.DescribeFieldResult field = Applicant__c.Qualification__c.getDescribe();
 
        for (Schema.PicklistEntry f : field.getPicklistValues())
         Qualification.add(f.getLabel());
 
      }
      return Qualification;          
    }
    set;
  }
 
}

Here is my visualforce code............

<apex:page controller="SearchapplicantsController" sidebar="false">

 <script type="text/javascript">
      function doSearch() {
        searchServer(
          document.getElementById("First_Name__c").value,
          document.getElementById("Skill_set__c").value,
          document.getElementById("Experience__c").value,
           document.getElementById("Expected_Annual_Salary__c").value,
          document.getElementById("Location__c").value,
          document.getElementById("Qualification__c").options[document.getElementById("Qualification__c").selectedIndex].value
          );
      }
      </script>
 
  <apex:form >
  <apex:pageMessages id="errors" />
 
  <apex:pageBlock title="Find Me A Candidate!" mode="edit">
 
  <table width="100%" border="0">
  <tr>  
    <td width="200" valign="top">
 
      <apex:pageBlock title="Parameters" mode="edit" id="criteria">
 
       
 
      <apex:actionFunction name="searchServer" action="{!runSearch}" rerender="results,debug,errors">
          <apex:param name="First_name__c" value="" />
          <apex:param name="Skill_set__c" value="" />
          <apex:param name="Experience__c" value="" />
          <apex:param name="Expected_Annual_salary__c" value="" />
          <apex:param name="Location__c" value="" />
          <apex:param name="Qualification__c" value="" />
      </apex:actionFunction>
 
      <table cellpadding="2" cellspacing="2">
      <tr>
        <td style="font-weight:bold;">First Name<br/>
        <input type="text" id="First_name__c" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Skillset<br/>
        <input type="text" id="Skill_set__c" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Experience<br/>
        <input type="text" id="Experience__c" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Expected salary<br/>
        <input type="text" id="Expected_Annual_salary__c" onkeyup="doSearch();"/>
        </td>
      </tr>
      <tr>
        <td style="font-weight:bold;">Location<br/>
        <input type="text" id="Location__c" onkeyup="doSearch();"/>
        </td>
      </tr>

      <tr>
        <td style="font-weight:bold;">Qualification<br/>
          <select id="Qualification__c" onchange="doSearch();">
            <option value=""></option>
            <apex:repeat value="{!Qualification}" var="qua">
              <option value="{!qua}"> {!qua}</option>
            </apex:repeat>
          </select>
        </td>
      </tr>
      </table>
 
      </apex:pageBlock>
 
    </td>
    <td valign="top">
 
    <apex:pageBlock mode="edit" id="results">
 
        <apex:pageBlockTable value="{!applicants}" var="applicant">
 
            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="First Name" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="first_name__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.First_Name__c}"/>
            </apex:column>
 
            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Skill set" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="Skill_set__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.Skill_set__c}"/>
            </apex:column>
 
            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Experience" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="Experience__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.Experience__c}"/>
            </apex:column>
 
            <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Expected salary" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="Expected_Annual_salary__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.Expected_Annual_Salary__c}"/>
            </apex:column>
                   <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Location" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="Location__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.Location__c}"/>
            </apex:column>
  <apex:column >
                <apex:facet name="header">
                    <apex:commandLink value="Education" action="{!toggleSort}" rerender="results,debug">
                        <apex:param name="sortField" value="Qualification__c" assignTo="{!sortField}"/>
                    </apex:commandLink>
                </apex:facet>
                <apex:outputField value="{!applicant.Qualification__c}"/>
            </apex:column>
 
        </apex:pageBlockTable>
 
    </apex:pageBlock>
 
    </td>
  </tr>
  </table>
 
  <apex:pageBlock title="Debug - SOQL" id="debug">
      <apex:outputText value="{!debugSoql}" />           
  </apex:pageBlock>    
 
  </apex:pageBlock>
 
  </apex:form>
 
</apex:page>