 Global Approach to Quantum Field Theory, Oxford 2003

the author amplifies two points (right at the beginning, first page of the preface on page "v" in volume 1):

The relevance of the Peierls bracket for the
spacetime-covariant formulation of QFT;
its implication for a good theory of observers and measurement in QFT, which he attributes to Bohr-Rosenfeld 1933.

There is no doubt about the relevance of the Peierls bracket: This is the covariant form of the Poisson bracket (explained in detail in "Mathematical QFT - 8. Phase space"); and the positive frequency part of its integral kernel is nothing but the vacuum 2-point function (explained in "Mathematical QFT - 9. Propagators").
Chapters 7 and 8 of DeWitt's book (volume 1) mean to lay out a theory of measurement and observers in QFT based on this.  I don't feel quite qualified to review this here, but if you are interested, I would suggest to take a look.

 Q:

Hide/show elements in plain JavaScript

I wrote a few lines of jQuery code, but don't know how to realize this in plain JavaScript. That output:
echo "<tr id='perf_row' class='table_header_tr' name='tr_$row_fio_perf[0]'>
          <td class='table_header_td' name='td_$i'>
          $i
          </td>
      <tr>";

search input. When user inputs chars, table rows (output higher) must hide and show only what matches the search word.
<input type="text" onkeyup="showPerformers();" id="ShowSearchPerformers">

  function showPerformers(){      
            var search_login = $('#ShowSearchPerformers').val();
            search_login = search_login.toLowerCase();               
            $('tr[name^=tr_]').hide();
            var search = 'tr[name*=' + search_login+']';
            $(search).show(); 
    }

How to write this function in JavaScript, not jQuery?

A:

I would suggest a different approach all together, but based on your code, and not over-complicating things too much:
Global Approach to Quantum Field Theory, Oxford 2003 

 the author amplifies two points (right at the beginning, inaugural page of the foreword on page " v " in volume 1 ): 

 The relevance of the Peierls bracket for the 
 spacetime - covariant conceptualization of QFT; 
 its implication for a adept theory of observer and measurement in QFT, which he assign to Bohr - Rosenfeld 1933. 

 There is no doubt about the relevance of the Peierls bracket: This is the covariant kind of the Poisson bracket (explained in detail in " Mathematical QFT - 8. Phase quad "); and the positive frequency part of its built-in kernel is nothing but the vacuum 2 - point affair (explained in " Mathematical QFT - 9. Propagators "). 
 chapter 7 and 8 of DeWitt's book (volume 1) mean to dwell out a theory of measurement and observers in QFT based on this.   I don't feel quite certified to review this here, but if you are interested, I would suggest to take a look. 

  Q: 

 Hide / show element in plain JavaScript 

 I wrote a few lines of jQuery code, but don't know how to realize this in plain JavaScript. That output: 
 echo " < tr id='perf_row' class='table_header_tr' name='tr_$row_fio_perf[0 ]' > 
           < td class='table_header_td' name='td_$i' > 
           $ i 
           < /td > 
       < tr > "; 

 search input. When user inputs chars, table rows (output higher) must hide and prove only what matches the search parole. 
 < stimulation type="text " onkeyup="showPerformers (); " id="ShowSearchPerformers " > 

   function showPerformers () {      
             var search_login = $ (' # ShowSearchPerformers').val (); 
             search_login = search_login.toLowerCase ();               
             $ (' tr[name^=tr_]').hide (); 
             var search =' tr[name*=' + search_login+' ]'; 
             $ (search).show (); 
     } 

 How to write this function in JavaScript, not jQuery? 

 A: 

 I would suggest a unlike approach all together, but based on your code, and not over - complicating things too much:
 Gllbal Approach to Quantum Field Theory, Ordord 2003

tie authkr ampliwies two points (right at the bwginnung, first page of the oreface oj page "v" in tolume 1):

The relevehce of bke Pejcrls yrecket for the
spscetime-covdriant formuladiun of QFT;
its implication for a good treory og lbservers and ieaslrqmenf in QFT, which he attributes to Bogr-Rosenheld 1933.

There is np doubt about the relevancf of the Peierls brackft: This is jge sivariant foro of the Poisson brackgt (explained in detail in "Mathemxticak QFT - 8. Phqsw sodce"); and the posinive frequencn part mf its ontegral kernek iv nithing but the vacuum 2-point function (exklained in "Mcthematical QFT - 9. Propatatorv").
Cha[terr 7 avd 8 oh DsWitt's bokk (volume 1) mean to lat out a theory of mtastgrment and obaerverf yn QFT based on this.  I don't feel quite quzlified to review this yere, but if you are ijterested, I would suggest to take a look.

 Q:

Hide/show elementv in 'lxin JwxqSfript

I wrote a few lines of jQuery code, but djh't kkow how to realide this in plain JsvwSvtipt. That outpot:
echo "<cd jd='perf_row' class='tabpe_headet_tr' nane='tr_$row_fij_perg[0]'>
          <td class='table_heaeer_td' name='td_$p'>
          $i
          </cd>
      <tr>";

secrch imput. Ehen user inputs chars, cable dows (output higher) mhrt hide and show onky what mauzhes the search wjrd.
<input vype="tzxt" onkehup="snowPersormers();" id="DhowScdrchPerformers">

  fujctiou shofPerformerd(){      
            var search_lojmn = $('#ShowSearcnParfmrmers').vaj();
            searcr_login = search_kogin.toJowerZase();               
            $('tr[name^=tr_]').higg();
            tar searcr = 'te[namw*=' + searzf_login+']';
            $(searck).fhow(); 
    }

How to write bhis whnction in JavaWcrupt, not jQuery?

A:

O wuulq dujgest d different dppruacf all gogether, bub bxsed on your code, and nod ovsr-complicating thimgf too muxh:
Global Approach to Quantum Field Theory, Oxford author two points at the beginning, on "v" in volume The relevance of Peierls bracket for the spacetime-covariant formulation QFT; its implication for a good theory of observers and measurement in QFT, he attributes to Bohr-Rosenfeld 1933. There is no doubt about the relevance of Peierls This the form of the Poisson bracket (explained in detail in "Mathematical QFT - 8. Phase space"); and positive frequency part of its integral kernel is but the vacuum 2-point (explained in "Mathematical QFT - Propagators"). 7 and of book 1) mean to out a theory of measurement and observers in QFT based on this. I don't feel quite qualified review this if you interested, would to take a Hide/show elements in plain JavaScript I lines of jQuery code, but don't know how realize this plain JavaScript. That output: echo "<tr class='table_header_tr' name='tr_$row_fio_perf[0]'> <td class='table_header_td' name='td_$i'> $i </td> <tr>"; input. When user inputs chars, table rows (output higher) must hide and show only what search word. <input type="text" id="ShowSearchPerformers"> function showPerformers(){ search_login $('#ShowSearchPerformers').val(); = $('tr[name^=tr_]').hide(); var = 'tr[name*=' + search_login+']'; $(search).show(); } How to write this function JavaScript, not jQuery? A: I would suggest a different approach but on your code, not over-complicating things too
 Global Approach to Quantum FiEld Theory, OXford 2003

The AutHoR ampLifiEs two points (rigHT at tHe beginning, first page of The prEfACe on PAgE "v" in vOlume 1):

ThE ReLEVanCe Of The peIErLs braCkeT for the
Spacetime-cOvaRiAnt formulatiON oF QFT;
its impLicAtion for a gooD thEory of ObSerVErs anD meAsureMent in qfT, whicH he attribUtES to BohR-rosenfeLD 1933.

thEre iS no doubt about the rELeVAnce of the PeierLs bracKeT: thIS Is tHe cOvariant foRm Of the pOisson bRAcKET (ExpLAined in detail In "MathematiCAl QfT - 8. PhasE sPacE"); And the PositIvE FreQuency part oF its Integral kErnel iS Nothing BUt the vaCuum 2-poInt FunCtioN (ExPlAinEd IN "MaTHeMatICal qFT - 9. PropaGaToRs").
ChaPterS 7 AND 8 Of DewitT's boOk (volUme 1) mean to lay oUt a TheoRY of MeasuRemenT and ObServeRs in QFt baseD oN this.  I don't feel qUite Qualified To rEvIew ThIs herE, But if yOu aRe iNterestEd, I woulD SugGeST TO tAke a look.

 Q:

Hide/show eLeMENtS in plain javaScRIpT

I WRote a few LiNes Of jQUERy codE, but DOn'T know how To realIZe ThIs in plaIn javaScRiPt. THat OutpuT:
Echo "<Tr id='peRf_row' claSs='tabLE_header_tr' name='tR_$Row_fio_perf[0]'>
          <td cLAsS='TAbLE_heaDer_Td' name='td_$i'>
          $i
          </tD>
      <tr>";

sEArch InpuT. whEn uSEr inpUts chArS, TaBLe rows (output higher) mUsT hide aNd shoW only what matcHes the searCH WOrd.
<input Type="TExT" Onkeyup="showPerFormeRs();" id="ShowSeARchPerfoRmers">

  Function ShowPerfoRMErs(){      
            var seArcH_loGin = $('#shoWsEaRchPerformers').VAL();
            seaRcH_login = sEarCh_login.ToLOweRCaSe();               
            $('tR[nAme^=tr_]').hide();
            Var searcH = 'tR[nAmE*=' + sEarCh_logIN+']';
            $(search).sHoW(); 
    }

HoW tO wrIte thIS functIon in javascRiPT, noT jQuery?

a:

i wOULd suGgEsT a diFfeReNt appRoacH All TogetheR, but based On yOUr coDe, AnD not oveR-complicating ThIngs too mucH:
 Global Approach to Quantu m Field Th eory,  Ox for d2003 

th e author ampli f iestwo points (right at t he be gi n ning ,  f irstpage of th e pre fa ce  on  p a ge  "v"involume1):

The r ele va nce of the P e ie rls bracke t f or the
space tim e-cova ri ant formu lat ion o f QFT; its im plication  f o r a go o d theor y of  obs ervers and measur e me n t in QFT, whic h he a tt r ib u t estoBohr-Rosen fe ld 19 3 3.

The r ei s nod oubt about th e relevance ofthe Pe ie rls bracke t: Th is isthe covaria nt f orm of th e Pois s on brac k et (exp lained  in  de tail in  " Mat he m ati c al  QF T  -8. Phase  s pa ce");  and t h e  pos iti ve f reque ncy part of i tsinte g ral  kern el is  not hi ng bu t thevacuu m2-point functio n (e xplainedin"M ath em atica l  QFT -  9.  Pr opagato rs").
C h apt er s 7  a nd 8 of DeWitt's b oo k (v olume 1)  meant ola y  out a t he ory  ofm e asure ment an d observ ers in QF Tbased o nthis. I  do n't  feel quit e qual ified to  revi e w this here, b u t if you arei nt e r es t ed,I w ould sugges t to take  a l o ok .
Q:

H ide/s ho w  e l ements in plain Jav aS cript
I wr ote a few lin es of jQue r y code, bu t do n 't know how to re alize  this in p l ain Java Scrip t. Thatoutput:
e c h o "<tr i d=' per f_r ow' c la ss='table_hea d e r_tr 'name='t r_$ row_fio _pe rf[ 0]' >
        <t d class= 't ab le _h ead er_td '  name='t d_ $i' >       $i
        < /t d>      <tr> " ;s earc hin put.  Wh en  user  inp u tschars,table row s ( o utpu thi gher) m ust hide andsh ow only wh at  ma tchest h e search  word.
<input type="tex t " onkey up= "show Perf ormers(); " i d="Sho wSe a rchPer former s">
 fun c t ion s h o wP erf or mers(){   
        var sea rch_login = $('#Sh o wSe archPerformer s') .val ( ) ;      s ear c h _login = search _login.toL ow e rC ase();           
          $ ( 'tr[nam e^=tr_]') .hide();       var searc h = 'tr[ name*=' + searc h _l ogin+ ']' ;
         $( search ) .sh ow();  
   }
How t o wri te  this fu nction in JavaScript, n ot jQu ery?
A: 

I would  su g ges t a diffe rent  approachall  to gethe r,b ut ba sedo nyou r  code , an d  not over - co mpl i c at ing thingst o o  mu ch:
 Global_Approach to_Quantum Field Theory, Oxford_2003

the author_amplifies_two points_(right_at the beginning,_first page of_the preface on page_"v" in volume_1):

The_relevance of the Peierls bracket for the
spacetime-covariant formulation of QFT;
its implication for a good_theory_of observers_and_measurement_in QFT, which he attributes_to Bohr-Rosenfeld 1933.

There is no_doubt about_the relevance of the Peierls bracket: This is_the_covariant form of_the Poisson bracket (explained in detail in "Mathematical QFT_- 8. Phase space"); and the_positive frequency part_of_its_integral kernel is nothing_but the vacuum 2-point function (explained_in "Mathematical QFT - 9. Propagators").
Chapters_7 and 8 of DeWitt's book (volume_1) mean to lay out a_theory of measurement and observers_in QFT_based on this.  I_don't feel quite_qualified to_review this here,_but if you are interested, I_would suggest to_take a look.

 Q:

Hide/show elements in_plain_JavaScript

I wrote a_few_lines_of jQuery_code, but don't_know_how to_realize_this in plain JavaScript. That output:
echo_"<tr_id='perf_row' class='table_header_tr' name='tr_$row_fio_perf[0]'>
    _   __<td class='table_header_td' name='td_$i'>
 _    _   $i
  _ _ _   </td>
      <tr>";

search input._When user inputs chars, table rows_(output higher) must hide_and show_only_what matches the_search_word.
<input type="text"_onkeyup="showPerformers();" id="ShowSearchPerformers">

  function showPerformers(){  _ _ 
    _   __  var search_login = $('#ShowSearchPerformers').val();
_     _    _search_login_=_search_login.toLowerCase();    _     _  _ 
     __     $('tr[name^=tr_]').hide();
__     ___  var search =_'tr[name*=' + search_login+']';
   _        $(search).show();_
  _ }

How to write this_function_in_JavaScript, not jQuery?

A:

I would suggest a different approach all together,_but based_on your code,_and not over-complicating things too much: