https://www.cornonthejob.com/index.php?lj_action=lj_js_page&ver=1.1

1// attach event listener for hijack
2if(window.addEventListener) { window.addEventListener('load', lwp_hijack_search, false); }
3else { window.attachEvent('onload', lwp_hijack_search); }
4// Prep WP search form for Lijit functionality
5
6function lwp_pnode( objNode, strTagName ){                                       
7    for ( 
8	objNode = objNode.parentNode ; 
9	(
10	    objNode && (			
11		(objNode.tagName && (objNode.tagName.toLowerCase() != strTagName)) ||
12		(!objNode.tagName && (objNode.nodeType != 3)) 
13	    )
14	);
15	objNode = objNode.parentNode
16	){}
17    return( objNode );
18}
19		
20function lwp_findElem(lwp_el_type,lwp_method){
21
22  if (lwp_el_type == 'FORM')
23  {
24    lwp_search_id = new Array('searchform','searchForm','search_form','search','Search','search-form','searchform2');
25  }
26  else if (lwp_el_type == 'INPUT')
27  {
28     lwp_search_id = new Array('s','search','search-text','search-input','Search','searchbox','q');
29
30  }
31  
32    for (var i in lwp_search_id)
33    {
34     
35	if (document.getElementById(lwp_search_id[i]) && document.getElementById(lwp_search_id[i]).tagName == lwp_el_type)
36	{
37		if (lwp_el_type == 'INPUT'&& lwp_method == 'id')
38		{
39		      lwp_obj = document.getElementById(lwp_search_id[i]);
40		      if (!lwp_obj)
41		      {
42			lwp_obj = document.getElementsByName(lwp_search_id[i])[0];
43		      }
44		      var lwp_both = new Array(lwp_obj,lwp_pnode(lwp_obj,'form'));
45		      return lwp_both;
46		}
47		else
48		{
49		      return document.getElementById(lwp_search_id[i]);
50		}
51	     
52	}
53	else
54	{
55		if (lwp_el_type == 'INPUT'&& lwp_method == 'id')
56		{
57		
58			lwp_obj = document.getElementsByName(lwp_search_id[i])[0];
59			var lwp_both = new Array(lwp_obj,lwp_pnode(lwp_obj,'form'));
60			return lwp_both;
61		 }
62		 else if (lwp_el_type == 'INPUT' && lwp_method == '')
63		 {
64
65			lwp_obj = document.getElementsByName(lwp_search_id[i])[0];
66			return lwp_obj;
67		 }
68	}
69     }
70
71   return false;
72}
73
74function lwp_hijack_search() {
75  
76	var lwp_formId = lwp_findElem('FORM','id');
77	if (!lwp_formId)
78	{
79		var lwp_finder= lwp_findElem('INPUT','id');
80		inputText = lwp_finder[0];
81		lwp_formId = lwp_finder[1];
82		inputText.value = 'Lijit Search';
83		inputText.onblur = function(){if (inputText.value == ''){inputText.value = 'Lijit Search';}};
84		inputText.onfocus = function(){if (inputText.value == 'Lijit Search'){inputText.value = '';}};
85	
86		try
87		{
88			lwp_formId.onsubmit = lwp_hijack_submit;
89		}
90		catch(err)
91		{
92		
93		}
94	}
95	else
96	{
97		var inputText= lwp_findElem('INPUT','');	
98		inputText.value = 'Lijit Search';
99		inputText.onblur = function(){if (inputText.value == ''){inputText.value = 'Lijit Search';}};
100		inputText.onfocus = function(){if (inputText.value = 'Lijit Search'){inputText.value = '';}};
101	
102		try
103		{
104			  
105			lwp_formId.onsubmit = lwp_hijack_submit;
106		}
107		catch(err)
108		{
109			
110		}
111	}
112
113}
114// do the search
115function lwp_hijack_submit(e) {
116	var lwp_inputText = lwp_findElem('INPUT','');
117	lwp_dosearch(lwp_inputText.value);
118	return false;
119}
120