in jquery can i add a readonly attribute to a input that the only property i can touch is a function? -

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i have multiple inputs (unknow number)

<input id="ctl00_contentplaceholder_txtsopurchasersapid" onkeydown="return scriptreadonly();" style="width: 150px" name=ctl00$contentplaceholder$txtsopurchasersapid>

there not on same page of app, id's , names dynamically loaded cannot add class because there many , don't know location of inputs.

my question is, can attach attribute of readonly jquery inputs thing same on each of them onkeydown="return scriptreadonly();

yes, can, using attribute equals selector:

$('input[onkeydown="return scriptreadonly();"]').prop("readonly", true);

live example:

function scriptreadonly() { }  $('input[onkeydown="return scriptreadonly();"]').prop("readonly", true);
<input id="ctl00_contentplaceholder_txtsopurchasersapid" onkeydown="return scriptreadonly();" style="width: 150px" name=ctl00$contentplaceholder$txtsopurchasersapid>  <input id="ctl01_contentplaceholder_txtsopurchasersapid" onkeydown="return scriptreadonly();" style="width: 150px" name=ctl01$contentplaceholder$txtsopurchasersapid>  <input id="ctl02_contentplaceholder_txtsopurchasersapid" onkeydown="return scriptreadonly();" style="width: 150px" name=ctl02$contentplaceholder$txtsopurchasersapid>  <input id="ctl03_contentplaceholder_txtsopurchasersapid" onkeydown="return scriptreadonly();" style="width: 150px" name=ctl03$contentplaceholder$txtsopurchasersapid>    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

if text of onkeydown attribute varies bit, can use filter instead make things more fuzzy:

$('input').filter(function() {   return $(this).attr("onkeydown").indexof("scriptreadonly") != -1; }).prop("readonly", true);

live example:

function scriptreadonly() { }  $('input').filter(function() {    return $(this).attr("onkeydown").indexof("scriptreadonly") != -1;  }).prop("readonly", true);
<input id="ctl00_contentplaceholder_txtsopurchasersapid" onkeydown="return /*0*/scriptreadonly();" style="width: 150px" name=ctl00$contentplaceholder$txtsopurchasersapid>  <input id="ctl01_contentplaceholder_txtsopurchasersapid" onkeydown="return /*1*/scriptreadonly();" style="width: 150px" name=ctl01$contentplaceholder$txtsopurchasersapid>  <input id="ctl02_contentplaceholder_txtsopurchasersapid" onkeydown="return /*2*/scriptreadonly();" style="width: 150px" name=ctl02$contentplaceholder$txtsopurchasersapid>  <input id="ctl03_contentplaceholder_txtsopurchasersapid" onkeydown="return /*3*/scriptreadonly();" style="width: 150px" name=ctl03$contentplaceholder$txtsopurchasersapid>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>


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