Javascript document.querySelector One Element Tutorial

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Javascript document.querySelector One Element Tutorial

Javascript document.querySelector One Element Tutorial

Yes, adding a functionality layer on top of the recent Javascript document.querySelectorAll Share and Save Tutorial we turn our attention from document.querySelectorAll to …

  • as well as a full scan of a CSS selection, allow for the honing in onto a particular element the order of which is nominated by the user … begs the question …
  • Is there a document.querySelectorFirst? No. Is there a document.querySelector? Yes (it returns first matched element). Do we use it to achieve today’s blog post aims? Oddly, no.
  • Do we use CSS :nth-of-type([userNumber]) or :nth-child([userNumber]) or :first-of-type CSS pseudo classes? No (it’s a long story).

Those CSS pseudo classes only suit predictable nested element arrangements such as with ul/li or ol/li or table/tr/th/td types of HTML data.

We settled on a less quirky (but one that tees in nicely with our general principle that an element ID attribute suits Javascript and an element CLASS suits CSS) solution, but a possible one because our style and script can be dynamic and be helped out by each other …

CSS
Was Becomes

img { BORDER-radius:20% border: 1px dotted magenta; }
.bodyimg { BORDER-radius:20% border: 1px dotted magenta; }
Javascript (in broad brush terms)
Was Becomes

Use document.querySelectorAll( 'img' ) resultant list to further process user requirements.
Still use document.querySelectorAll('img') resultant list (and as required only process "All" or the matching order of element) and make sure in a matching element's "class" attribute bodyimg appears, in order to further process user requirements.

And so yet again, with the changed qsall.js external Javascript helping out this changed qsall.htm‘s live run link you can try these functionalities yourself.

Previous relevant Javascript document.querySelectorAll Share and Save Tutorial is shown below.

Javascript document.querySelectorAll Textarea Placeholder Tutorial

Javascript document.querySelectorAll Share and Save Tutorial

On top of yesterday’s Javascript document.querySelectorAll Textarea Placeholder Tutorial today’s progress concerns …

  • sharing (via client email and sms applications) …
    1. email
    2. sms
  • save (via window.localStorage)

… that has user controls, those being three input type=button for creation and one select (dropdown) element for recall, added into the main H1 header element.

Along the way, we’ve hived off the following into a new external Javascript qsall.js because we may see some/all of them as worthy of a “tool” that can be called in other web applications, perhaps …

  • user definable Javascript scripting (interfacing)
  • email
  • sms
  • save (via window.localStorage)

… in a first draft genericization push.

Yet again, using this changed qsall.htm‘s live run link you can try these functionalities yourself.

Previous relevant Javascript document.querySelectorAll Textarea Placeholder Tutorial is shown below.

Javascript document.querySelectorAll Textarea Placeholder Tutorial

Javascript document.querySelectorAll Textarea Placeholder Tutorial

Thinking of some great Fred and Ginger types of web application partners we have, at the very least …

  • HTML and Javascript
  • PHP and MySql
  • MySql and phpMyAdmin
  • Ajax and FormData
  • Webpage and Iframe
  • Details and Summary
  • Div and Contenteditable

… and today we’ve partnered Textarea and Placeholder because we’ve discovered that Placeholder (on many browsers and platforms) can be multiline by nature. That suits our style, whereby we try not to bombard users with loads of user entries to have to worry about in web applications, where that is at all possible, but rather resort to intelligent user interaction, often based on delimiters, encouraging the one piece (or perhaps two or three pieces) of information to fill in.

Today’s progress (added to that of yesterday’s Javascript document.querySelectorAll User Scripting Tutorial) concerns that user interaction design to our “Testing Out document.querySelectorAll” web application is to …

  • replace single line input type=text element with textarea element … and …
  • replace single line advice in a single line placeholder attribute with a multiline placeholder “blurb” which includes an example

… and, speaking personally, the relief is incredible, as we have had to grapple with the awkwardness of user entry for days now!

We even styled the placeholder thanks to the advice at W3schools, thanks.

And then we thought we’d allow the user to set the example bit of the placeholder as a “starter” for their real entry via a “two times click on the textarea” set of (on document onload event) logic as per …


function onl(injs) {
if (document.getElementById('myinput')) {
if (document.getElementById('myinput').outerHTML.indexOf('<textarea') != -1) {
var egis=String.fromCharCode(10) + String.fromCharCode(10) + " Example (2xClick) of Einstein Wikipedia Webpage with rounded magenta images and lightblue heading ... " + String.fromCharCode(10) + String.fromCharCode(10) + "http://www.wikipedia.org/wiki/Einstein" + String.fromCharCode(10) + "` img { " + String.fromCharCode(10) + " BORDER-radius:20%; " + String.fromCharCode(10) + " border: 1px dotted magenta; " + String.fromCharCode(10) + " } `" + String.fromCharCode(10) + " function fhlb() {" + String.fromCharCode(10) + " document.getElementById(" + '"' + "firstHeading" + '"' + ").style.backgroundColor=" + '"' + "lightblue" + '"' + "; " + String.fromCharCode(10) + " } " + String.fromCharCode(10) + " setTimeout(fhlb, 2000); " + String.fromCharCode(10);
document.getElementById('myinput').placeholder=document.getElementById('myinput').placeholder.replace(/\|\ /g, String.fromCharCode(10)).replace(' # or ` separate', ' # or ` or first line feed separate').replace(' # or ` and', ' # or ` or first line feed and') + egis;
document.getElementById('myinput').ondblclick = function(event){ ccnt=0; if (event.target.placeholder.indexOf('http') != -1) { event.target.value='http' + event.target.placeholder.split('http')[1]; } };
document.getElementById('myinput').onclick = function(event){ ccnt++; if (ccnt >= 2) { ccnt=0; if (event.target.placeholder.indexOf('http') != -1) { event.target.value='http' + event.target.placeholder.split('http')[1]; } } };
} else {
document.getElementById('myinput').placeholder=document.getElementById('myinput').placeholder.replace(/\|\ /g, '');
}
}
if (injs.trim() != '') {
var tag = document.createElement('script');
tag.type='text/javascript';
tag.src='data:text/javascript;base64,' + btoa(injs);
document.head.appendChild(tag);
}
}

Again, using this changed qsall.htm‘s live run link you can test this out for yourself.

Previous relevant Javascript document.querySelectorAll User Scripting Tutorial is shown below.

Javascript document.querySelectorAll User Scripting Tutorial

Javascript document.querySelectorAll User Scripting Tutorial

Another user defined feature we can add to yesterday’s Javascript document.querySelectorAll Absolute URL Tutorial‘s functionality list of …

  • CSS user defined selector default styling for relative URL
  • CSS user defined styling for relative URL
  • Onclick logic related to that CSS selector via Javascript document.querySelectorAll for relative URL
  • Popup window lor refresh mode child iframe src then srcdoc overlay techniques for relative URL that is nothing (ie. this web application)
  • Absolute URL support as per the top three functionalities above … today we have added …
  • User defined Javascript scripting (with the ` character delimiter added in case styling or scripting requires the # character)

Yes, Javascript can be user defined and dynamic in an already running execution via Javascript such as …


<head>
<script type='text/javascript'>
var thejs=location.search.split("thescript=")[1] ? decodeURIComponent(location.search.split("thescript=")[1].split('&')[0]).replace(/\;\ /g, '; ' + String.fromCharCode(10)) : "";;

function onl(injs) {
if (injs.trim() != '') {
var tag = document.createElement('script');
tag.type='text/javascript';
tag.src='data:text/javascript;base64,' + btoa(injs);
document.head.appendChild(tag);
}
}
</script>
</head>
<body onload="document.getElementById('myinput').focus(); onl(thejs);">

Using this changed qsall.htm‘s live run link’s functionalities, we can …

Use dynamically added Javascript to add three dots to top header

Previous relevant Javascript document.querySelectorAll Absolute URL Tutorial is shown below.

Javascript document.querySelectorAll Absolute URL Tutorial

Javascript document.querySelectorAll Absolute URL Tutorial

Just quietly, we add onto the functionality of yesterday’s Javascript document.querySelectorAll Client Pre-emptive Iframe Tutorial‘s work with the tolerance for the user to try some absolute URL entries as they try the changed qsall.htm live run link.

As we so often find ourselves doing these days we use the “midair” feeling Ajax/FormData techniques to attempt to satisfy the user interactions, as per …


var wasino=null;
var absval='';
var urltosend='';
var zhr=null;
var wasplaceholder='';

function showStuff(evt) {
if (zhr.readyState == 4) {
if (zhr.status == 200) {
absval=zhr.responseText;
//alert(absval);
}
}
}


function ajaxit() {
zhr = new XMLHttpRequest();
var form=new FormData();
form.append('inurl', urltosend);
form.append('tdinto', 'divinv');
if (document.URL.indexOf('localhost:8888') != -1) {
zhr.open('post', 'http://localhost:8888/fgc/', true);
} else {
zhr.open('post', '//www.rjmprogramming.com.au/PHP/fgc/', true);
}
zhr.onreadystatechange = showStuff;
zhr.send(form);
preshowBelow();
}


function preshowBelow() {
if (absval != '') {
wasino.value=wasino.placeholder;
wasino.placeholder=wasplaceholder;
showBelow(wasino);
wasino=null;
absval='';
} else {
setTimeout(preshowBelow, 2000);
}
}

function showBelow(ino) {
var his='', bahis='';
if (wasplaceholder == '') {
wasplaceholder=ino.placeholder;
}
if (('' + ino.value).toLowerCase().indexOf('//') == 0) {
ino.value=document.URL.split(':')[0].toLowerCase() + ':' + ino.value;
} else if (('' + ino.value).toLowerCase().indexOf('www.') == 0) {
ino.value=document.URL.split(':')[0].toLowerCase() + '://' + ino.value;
}
if (('' + ino.value).toLowerCase().indexOf('http') == 0) {
if (absval == '') {
urltosend=ino.value.split('#')[0];
ino.placeholder=ino.value;
ino.value=''; //ino.value.replace(urlis,'');
wasino=ino;
ajaxit();
return;
}
}
if (ino.value.indexOf('#') != -1) {
if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?window=popup&');
} else {
documentURL+='?window=popup';
}
} else if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?window=y&');
} else {
documentURL+='?window=y';
}
} else if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?refresh=y&');
} else {
documentURL+='?refresh=y';
}
}
if (ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY')).indexOf('{') != -1) {
selectorplusis=ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY'));
}
selectoris=ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY')).split('{')[0].trim();
}
if (ino.value.trim() != '') {
if (absval != '') {
bahis='data:text/html;base64,' + absval;
//alert(bahis);
absval='';
document.getElementById('ifgoeshere').innerHTML="<iframe id=ifsd onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' srcdoc=\"\"></iframe><iframe id=xifsd onload='checkif(this);' style='display:none;' src=\"" + bahis + "\"></iframe>";
} else if (ino.value.split('#')[0].trim() == '' && 1 == 2) {
document.getElementById('myh1').style.opacity='0.01';
document.getElementById('myh3').style.opacity='0.01';
document.getElementById('myinput').style.opacity='0.01';
document.getElementById('ifgoeshere').innerHTML="<iframe onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' src='" + document.URL + "'></iframe>";
} else if (ino.value.split('#')[0].trim() == '') {
his='<html>' + document.head.outerHTML + document.body.outerHTML + '</html>';
bahis='data:text/html;base64,' + btoa(his);
document.getElementById('ifgoeshere').innerHTML="<iframe id=ifsd onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' srcdoc=\"\"></iframe><iframe id=xifsd onload='checkif(this);' style='display:none;' src=\"" + bahis + "\"></iframe>";
} else {
document.getElementById('myh1').style.opacity='0.01';
document.getElementById('myh3').style.opacity='0.01';
document.getElementById('myinput').style.opacity='0.01';
document.getElementById('ifgoeshere').innerHTML="<iframe onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' src='" + ino.value.split('#')[0].trim() + "'></iframe>";
}
}
}

Previous relevant Javascript document.querySelectorAll Client Pre-emptive Iframe Tutorial is shown below.

Javascript document.querySelectorAll Client Pre-emptive Iframe Tutorial

Javascript document.querySelectorAll Client Pre-emptive Iframe Tutorial

Many web applications we present at this blog use what we refer to “inhouse” as …


Client Pre-emptive Iframe

… as that “suck it and see” client approach to do some of the “if it exists try it” functionality you might think has to involve a serverside language like PHP. No, all the discussion below, ignores serverside anything, but instead dwells on …

  • “child” iframe (leaning towards that Client Pre-emptive Iframe) making use of the “fresh start” their “onload” event (and to a lesser extent “onerror”) provides the client (only) programmer …
  • initially via “src” attribute … but new to today’s work (at least for us, that we can remember) …
  • initially involve src=”data:text/html;base64,[base64HTMLContent]” that …
  • (same) “onload” code can redirect that content to another “child” iframe (leaning towards that Client Pre-emptive Iframe) “srcdoc” attribute … and yes, we were not sure until today, but yes …
  • “child” iframe (leaning towards that Client Pre-emptive Iframe) that gets its content via “srcdoc” attribute does pass through the “onload” event logic where the “document” object exists (a very happy discovery for us (though we’ve probably been assuming it already in projects up to now))

… this “proof of concept” experimenting being incorporated into our “Javascript document.querySelectorAll” project for scenarios …

For relative URL that is blank (ie. uses this same webpage) suffixes of two blanks refreshes and that of four blanks opens new window and that of eight blanks opens new popup window.

… to the point where you may not notice the difference between this “srcdoc” processing compared to the other (single) “src” attribute executions of the web application.

How does the client wooooooorrrrrrrllllllldddd handle base64? Well, for simple data …

Why can’t we manage this new functionality in the one pass through the “onload” event logic? Well, any self-respecting webpage content will contain both apostrophe and double quote characters (let alone line feeds and carriage returns) ( but we can if we can get to a Javascript DOM statement like document.getElementById(‘ifsd’).srcdoc=atob((” + ioissrc).split(‘;base64,’)[1]).replace(‘</bo’ + ‘dy>’, ‘ <style> ‘ + selectorplusis + ‘</style> </bo’ + ‘dy>’); ), making it hard to specify on the Javascript codeline constructing your “child” iframe but now this new functionality uses …


var documentURL='' + document.URL.split('#')[0];


function showBelow(ino) {
if (ino.value.indexOf('#') != -1) {
if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?window=popup&');
} else {
documentURL+='?window=popup';
}
} else if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?window=y&');
} else {
documentURL+='?window=y';
}
} else if (('' + ino.value).indexOf(('' + ino.value).trim() + ' ') != -1) {
if (documentURL.indexOf('?') != -1) {
documentURL=documentURL.replace('?', '?refresh=y&');
} else {
documentURL+='?refresh=y';
}
}
if (ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY')).indexOf('{') != -1) {
selectorplusis=ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY'));
}
selectoris=ourdecodeURIComponent(ino.value.substring(eval(1 + ino.value.indexOf('#'))).replace(/NO\%WAY/g, 'NO%25WAY')).split('{')[0].trim();
}
if (ino.value.trim() != '') {
if (ino.value.split('#')[0].trim() == '' && 1 == 2) {
document.getElementById('myh1').style.opacity='0.01';
document.getElementById('myh3').style.opacity='0.01';
document.getElementById('myinput').style.opacity='0.01';
document.getElementById('ifgoeshere').innerHTML="<iframe onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' src='" + document.URL + "'></iframe>";
} else if (ino.value.split('#')[0].trim() == '') {
var his='<html>' + document.head.outerHTML + document.body.outerHTML + '</html>';
var bahis='data:text/html;base64,' + btoa(his);
document.getElementById('ifgoeshere').innerHTML="<iframe id=ifsd onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' srcdoc=\"\"></iframe><iframe id=xifsd onload='checkif(this);' style='display:none;' src=\"" + bahis + "\"></iframe>";
} else {
document.getElementById('myh1').style.opacity='0.01';
document.getElementById('myh3').style.opacity='0.01';
document.getElementById('myinput').style.opacity='0.01';
document.getElementById('ifgoeshere').innerHTML="<iframe onload='checkif(this);' style='position:absolute;top:0px;left:0px;width:100%;height:100%;z-index:7;' src='" + ino.value.split('#')[0].trim() + "'></iframe>";
}
}
}


function checkif(iois) {
var ij, wois=null;
if (iois != null) {
console.log('' + iois.src);
if (('' + iois.src).indexOf('data:') == 0 && ('' + iois.src).indexOf(';base64,') != -1) { // src=data:text/html;base64,[base64HTMLContent] comes here
var ioissrc=('' + iois.src);
iois.src='';
if (selectorplusis.indexOf(' BORDER') != -1) {
eles=document.querySelectorAll(selectoris);
for (ij=eval(-1 + eles.length); ij>=0; ij--) {
froms.push(eles[ij].outerHTML);
tos.push('<a onclick="alert(this.innerHTML);" style="cursor:pointer;text-decoration:none;" title="Border clickable">' + eles[ij].outerHTML + '</a>');
}
for (ij=0; ij<froms.length; ij++) {
ioissrc=ioissrc.replace(froms[ij], tos[ij]);
}
}
var xbodyt=atob(('' + ioissrc).split(';base64,')[1]).replace('</bo' + 'dy>', ' <style> ' + selectorplusis + '</style> </bo' + 'dy>');
var bodyt=xbodyt.split('<bo' + 'dy')[1];
if (('' + documentURL).indexOf('window=') != -1) {
if (('' + documentURL).indexOf('popup') != -1) {
wois=window.open('', '_blank', 'top=0, left=0, width=600, height=600');
} else {
wois=window.open('', '_blank');
}
wois.document.write(atob(('' + ioissrc).split(';base64,')[1]).replace('</bo' + 'dy>', ' <style> ' + selectorplusis + '</style> </bo' + 'dy>'));
} else if (('' + documentURL).indexOf('refresh=') != -1) {
document.body.innerHTML=bodyt.substring(eval(1 + bodyt.indexOf('>'))).split('</bo' + 'dy>')[0];
} else {
document.getElementById('myh1').style.opacity='0.01';
document.getElementById('myh3').style.opacity='0.01';
document.getElementById('myinput').style.opacity='0.01';
document.getElementById('ifsd').srcdoc=atob(('' + ioissrc).split(';base64,')[1]).replace('</bo' + 'dy>', ' <style> ' + selectorplusis + '</style> </bo' + 'dy>');
}
} else { // relative URL src comes here, as well as srcdoc (we have discovered today 23/1/2021)
console.log(1);
var aconto = (iois.contentWindow || iois.contentDocument);
console.log(2);
if (aconto != null) {
console.log(3);
//console.log(aconto);
console.log(4);
if (aconto.document) { aconto = aconto.document; }
console.log(5);
if (selectoris != '') {
console.log(6);
if (selectorplusis != '') {
console.log(7);
aconto.body.innerHTML+=' <style> ' + selectorplusis + '</style> ';
console.log(8);
if (selectorplusis.indexOf(' BORDER') != -1) {
console.log(9);
eles=aconto.querySelectorAll(selectoris);
for (ij=eval(-1 + eles.length); ij>=0; ij--) {
froms.push(eles[ij].outerHTML);
tos.push('<a onclick="alert(this.innerHTML);" style="cursor:pointer;text-decoration:none;" title="Border clickable">' + eles[ij].outerHTML + '</a>');
}
for (ij=0; ij<froms.length; ij++) {
aconto.body.innerHTML=aconto.body.innerHTML.replace(froms[ij], tos[ij]);
}
}
} else {
console.log('a');
eles=aconto.querySelectorAll(selectoris);
console.log('b');
for (ij=0; ij<eles.length; ij++) {
eles[ij].style.border='1px dashed red';
}
}
}
}
}
}
}

We hope you revisit the recent Javascript document.querySelectorAll User Styled Clickable Border Tutorial‘s improvements today’s work represents in the changed qsall.htm live run link is worth it to try the (Pure) Javascript meets CSS ideas above.

Previous relevant Javascript document.querySelectorAll User Styled Clickable Border Tutorial is shown below.

Javascript document.querySelectorAll User Styled Clickable Border Tutorial

Javascript document.querySelectorAll User Styled Clickable Border Tutorial

Yesterday’s Javascript document.querySelectorAll Primer Tutorial has been “stretched” in functionality in two ways …

  • yesterday’s user defined selector but static styling is now opened up to user defined styling as well …
  • we wanted to allow a user defined CSS styling that involves the use of ” BORDER” somewhere adds border clickable elements that satisfy the selector criteria used in …


function checkif(iois) {
var ij;
if (iois != null) {
var aconto = (iois.contentWindow || iois.contentDocument);
if (aconto != null) {
if (aconto.document) { aconto = aconto.document; }
if (selectoris != '') {
if (selectorplusis != '') {
aconto.body.innerHTML+=' <style> ' + selectorplusis + '</style> ';
if (selectorplusis.indexOf(' BORDER') != -1) {
eles=aconto.querySelectorAll(selectoris);
for (ij=eval(-1 + eles.length); ij>=0; ij--) {
froms.push(eles[ij].outerHTML);
tos.push('<a onclick="alert(this.innerHTML);" style="cursor:pointer;text-decoration:none;" title="Border clickable">' + eles[ij].outerHTML + '</a>');
}
for (ij=0; ij<froms.length; ij++) {
aconto.body.innerHTML=aconto.body.innerHTML.replace(froms[ij], tos[ij]);
}
}
} else {
eles=aconto.querySelectorAll(selectoris);
for (ij=0; ij<eles.length; ij++) {
eles[ij].style.border='1px dashed red';
}
}
}
}
}
}

Yes, we needed to ask for help, and got good help here, thanks (for that doh! moment).

Today’s changed live run link is worth it to try the (Pure) Javascript meets CSS ideas above.

Previous relevant Javascript document.querySelectorAll Primer Tutorial is shown below.

Javascript document.querySelectorAll Primer Tutorial

Javascript document.querySelectorAll Primer Tutorial

“Pure Javascript” versus “jQuery” is an issue for many developers of client side web application code logic. More often than not we plump for the former, though there are notable exceptions for us, such as jQuery Ajax is often of use, and we have used the very apt (for today’s topic) jQuery CSS on occasions. But for today’s proof of concept test run of …


document.querySelectorAll([CSS-selector]);

… it’s all “Pure Javascript”. In today’s qsall.html HTML and “Pure Javascript” code you will not find the string “document.querySelectorAll” anywhere because our web application is …

  • just some header HTML elements and one HTML input type=text “textbox” element and one containing div element and one input type=text to avoid “tabbing out” annoyances …
  • “textbox” accepts a relative URL in two parts as per …

    [relativeURLTo-//www.rjmprogramming.com.au/]#[CSS-selector]
  • that relative URL is the “src” attribute to an HTML iframe element that overlays (made to be barely visible) header HTML elements and one HTML input type=text “textbox” element … and whose …
  • “onload” event logic goes …

    function checkif(iois) {
    var ij;
    if (iois != null) {
    var aconto = (iois.contentWindow || iois.contentDocument);
    if (aconto != null) {
    if (aconto.document) { aconto = aconto.document; }
    if (selectoris != '') {
    eles=aconto.querySelectorAll(selectoris);
    for (ij=0; ij<eles.length; ij++) {
    eles[ij].style.border='1px dashed red';
    }
    }
    }
    }
    }

… that you can try for yourself with today’s live run link.

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