magento custom search

Step1. create search input box. when you want to applied

<div class="row srchby">

<div class="col-sm-12"><h3 class="blue-font" align="center">Search our database</h3></div>

<form role="search" action="<?=Mage::getBaseUrl()?>catalogsearch/result/" method="get" class="form-inline">

<input type="hidden" name="cat" id="searchCatId" value="<?=$categoryid?>" >

    <div class="form-group"><input type="text" name="q" class="form-control"  placeholder="Enter Part No. / Model No" id="searchCat" value=""></div>

<div class="form-group"><input type="submit" value="Search Now"></div>

</form>

</div>

<style>

#getproductCat{

    position: absolute;

z-index: 999;

margin-left: 27.90%;

margin-top: -2%;

display: none;

}

</style>

<div class="row">

<div id="getproductCat">

<div class="product_instant_search_popup clearfix">

  <a href="javascript:void(0)" onclick="removeddCatSearch()"><img src="<?php echo $this->getSkinUrl('images/FME_instantsearch/close.png');?>" alt="" class="close" width="20px"></a>

<?php 

$a=1;

?>

<div class="related">

<ul id="listCatSearch">

</ul>

</div>

</div>

</div>

</div>

Step 2. create ajax to call indexController 

<script>

// instantsearch is my module.

jQuery(document).on('keyup','#searchCat',function(obj){

var seaechData=jQuery(this).val();

var catId=jQuery('#searchCatId').val();

var dataString ='seaechData='+seaechData+'&catId='+catId;

//alert('asdasd'+seaechData);

var urlPost= '<?php echo $this->getUrl('instantsearch/index/searchcat')?>';

jQuery('#listCatSearch').html('');

jQuery.ajax({

type: "POST",

url: urlPost,

data: dataString,

cache: false,

success: function(result){

//alert(result);

jQuery('#getproductCat').show();

jQuery('#listCatSearch').html(result);

 

}

}); 

});

function removeddCatSearch(){

jQuery('#listCatSearch').html('');

jQuery('#getproductCat').hide();

}

</script>

Step 3:

create function in IndexController in any module

public function searchcatAction(){

if(!empty($_REQUEST['seaechData'])){

$q = $_REQUEST['seaechData'];

$categoryid = $_REQUEST['catId']; 

$category = new Mage_Catalog_Model_Category();

if(!empty($categoryid)){

$category->load($categoryid);

}

$collection = $category->getProductCollection();

$collection->addAttributeToSelect('*');

if(!empty($q)){

$collection->addAttributeToFilter('name', array('like' => '%'.$q.'%'));

}

$collection->getSelect()->order(new Zend_Db_Expr('RAND()'))->limit(100);

$_productCollection=$collection;

//echo $_productCollection->count();

$result='';

if($_productCollection->count()>0){

foreach ($_productCollection as $_product){

$result.='<li id="is-'.$_product->getid().'">

<a href="'.$_product->getProductUrl().'">'.ucfirst($_product->getName()).'</a>

</li>';

}

}else{

$result.='<li id="is-0">No Recorde Found!</li>';

}

echo $result;

}

}