javascript函數不jQuery的$（文件）內工作。就緒

Question

<script type="text/javascript" charset="utf-8" language="javascript"> 
    //Slider Function 
    function projectrefinesearch() { 
     alert('yes'); 
     var SliderSelectedMinPrice=$('#SliderSelectedMinPrice').val(); 
     alert(SliderSelectedMinPrice); 
     var SliderSelectedMaxPrice=$('#SliderSelectedMaxPrice').val(); 


     if(SliderSelectedMinPrice!=''){ 
      postdata+='&minprice='+SliderSelectedMinPrice; 
     } 
     if(SliderSelectedMaxPrice!=''){ 
      postdata+='&maxprice='+SliderSelectedMaxPrice; 
     } 

     $.ajax({ 
      url:'<?php echo SITEURL; ?>ajax.php', 
      data:postdata, 
      type:'POST', 
      beforeSend:function() { 
       $('#newloader').show(); 
      }, 
      success: function(output) { 
       $('#newloader').hide(); 
       $('.left_content_part').html(output); 
      } 
     }); 
    } 

    $(document).ready(function(){ 
     $('#priceslider #jslider-left').mouseup(function(){ 
      var val=$('#Sliderprice').val() 
      var init=0; 
      var a=val.split(";"); 
      init=a[0]; 
      //alert(init); 
      document.getElementById("SliderSelectedMinPrice").value=init; 
      projectrefinesearch(); 
     }); 
    } 
</script> 

其預算價格滑塊的init獲得價值後（你可以看到它在這裏http://www.indianpropertyoption.com/p/search-projects/result），document.getElementById("SliderSelectedMinPrice").value和projectrefinesearch();是行不通的。 document.getElementById("SliderSelectedMinPrice")仍然是null。 plz幫助我

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