Page Not Found Error Message Email Subject Tutorial

Why, with today’s tutorial, are we conflating two quite disparate subjects …

HTTP (ie. Hypertext Transfer Protocol) Error Code 404 “Page Not Found” or “Server Not Found” …with …
Email Subject lines

… into the one tutorial topic? Well, as we talked about with body of email scenarios, with some email clients (with Window SessionStorage Client Versus Server CSS Tutorial) …

As far as links go, you may expect to need serverside means to construct these in online Email and SMS message interfacing, but email (client program) products like Gmail parse your ascii text and convert http: or https: protocol URLs in your Email body to hyperlinks, as does the Messages SMS application here on this MacBook Pro using macOS Mojave.

… it pans out with some email clients such as iOS Mail app, that email subject lines containing similar http: or https: protocol URLs also get converted into hyperlinks. For us this has become a more likely scenario ever since the email [date] subject line token work typified by Local Datetime Token Subject Integrations Tutorial. The nature of those hyperlinks created, though, seem to be a great concern for these more helpful email clients and if you put into subject lines URLs containing “?” and “&” delimited arguments, the email clients mildly “mash up” these URLs so that recent ones from our “Plot Axes – Linear or Parabolic Formula” web application for (an example like) …

https://www.rjmprogramming.com.au/HTMLCSS/square_hr_tracing.htm?wording=Vertex%20Pointing%20Game&question=%20#blank=plot187|-200,-200,200,200|2,-123

… on email clients that do not do “the (monster) mash”, on an email client that “does hyperlink but mash up” the URL the email subject line takes you to is actually (an additional “layer of encodeURIComponent‘ed content” you can see as you hover over the link, the display normalized as far as looks go, via HTML entity mapping) …

https://www.rjmprogramming.com.au/HTMLCSS/square_hr_tracing.htm?wording=Vertex%20Pointing%20Game&question=%20#blank=plot187|-200,-200,200,200|2,-123

… which, without the tailoring of RJM Programming domain’s Error 404 trapping 404.shtml would not take you to its true destination (of look) … because of “the mash”.

It’s been a while since we set up this 404.shtml Apache web server means to serve “Not Found” (Page) URLs with a more welcoming experience than the default web browser “Error 404 … Not Found” kind of error message, so we started our research into whether it was possible to redirect from a 404.shtml on an Apache web server at this useful Google search, thanks.

Now, it must be noted here, that the search engines may penalise you for making the 404.shtml redirection we are going to show you below. Honestly, we don’t know, but we feel compelled to let you know that such a redirection is possible on an Apache web server’s 404.shtml with a document.body “onload” changed event (HTML and Javascript code snippet) piece of logic as below …

<script type='text/javascript'> function onPageUnload() { } function onPageLoad() { if (document.URL.indexOf('square_hr_tracing.htm%') != -1) { location.href=document.URL.replace('%3F','?').replace(/\%23/g, '#').replace(/\%26/g, '&'); exit; } } </script> </head> <body style="background: #d4d4d4; margin: 0pt; " onload="onPageLoad();" onunload="onPageUnload();">

… that is helping make sense of the “mashed up” URL (from some email client subject lines) above, as well as the rest of this 404.shtml (placed into RJM Programming domain’s Document Root) showing a more friendly webpage for all those misdirected URLs such as this one.

Previous relevant Window SessionStorage Client Versus Server CSS Tutorial is shown below.

Window SessionStorage Client Versus Server CSS Tutorial

Further to yesterday’s Window SessionStorage Client Versus Server Integration Tutorial we have a two pronged improvements set for you today with our current Capital City Find Matching Country Report web application project …

CSS styling changes … and …
additional functionality for Email and SMS links back to our current Capital City Find Matching Country Report web application project (to complete the cycle)

We use several modes of CSS application (the first and last of particular relevance to today’s “highlighting of workflow” improvements) …

“static” internal CSS coding within thechanged wls_vs_phphtm‘s CapitalCity Find Matching Country Report live run link’s new CSS and linking improvements, which caused thechanged colour_wheelhtml‘s colour wheel (at this liverun link) to be affected (by integrations “up”, opening up the Google Maps and YouTube interfacing emoji buttons there)
“static” internal HTML “style” attribute styling
“dynamic” Javascript DOM HTML “style” attribute changes
“dynamic” Javascript DOM “class” modifications to dovetail with the “static” internal CSS coding as above

… the “static” measures often helping to highlight the web application’s main workflow of user interaction and the “dynamic” measures helping to alert the user as to where to proceed with their “workflow”.

In terms of CSS styling work …

for non-mobile platforms we allow for more columns to be applied to our Capitals select (dropdown) element (in order to reduce some user scrolling, as does our new additional A-Z letter basis sorting functionality) as per … the “dynamic” Javascript DOM “class” modifications …
if (!navigator.userAgent.match(/Android|BlackBerry|iPhone|iPad|iPod|Opera Mini|IEMobile/i)) { document.getElementById('lefttd').className='lefttd'; }
… dovetailing with the “static” internal CSS coding …
<style> .lefttd { column-count: 4; max-height: 35%; vertical-align: top; max-width: 70%; font-size: 8px; background-color: rgba(205,205,205,0.5); background-image: -webkit-gradient( linear, right bottom, left top, color-stop(0, rgba(205, 205, 205, 0.8)), color-stop(0.50, rgba(255, 255, 0, 0.2)) ); background-image: -o-linear-gradient(left top, rgba(205, 205, 205, 1) 0%, rgba(255, 255, 0, 0.2) 50%); background-image: -moz-linear-gradient(left top, rgba(205, 205, 205, 1) 0%, rgba(255, 255, 0, 0.2) 50%); background-image: -webkit-linear-gradient(left top, rgba(205, 205, 205, 1) 0%, rgba(255, 255, 0, 0.2) 50%); background-image: -ms-linear-gradient(left top, rgba(205, 205, 205, 1) 0%, rgba(255, 255, 0, 0.2) 50%); background-image: linear-gradient(to left top, rgba(205, 205, 205, 1) 0%, rgba(255, 255, 0, 0.2) 50%); } </style>
… and please note that around here at RJM Programming we have a “far from hard and fast rule” (but a rule regardless) regarding HTML element ID and class attributes that they concern (and (usually) be compartmentalised into) Javascript (DOM) manipulations and CSS styling issues respectively … and add a linear-gradient background to the table cell when expecting the initial user interaction on non-mobile platforms
a “dynamic” Javascript DOM “class” modification … document.getElementById(‘myrepsb’).className=’dglow’; … is made to the “Report…” button at the Capitals select (dropdown) onfocusout event so as to highlight (with “glow” inspired styling) where user interaction may flow to

As far as links go, you may expect to need serverside means to construct these in online Email and SMS message interfacing, but email (client program) products like Gmail parse your ascii text and convert http: or https: protocol URLs in your Email body to hyperlinks, as does the Messages SMS application here on this MacBook Pro using macOS Mojave. Cute, huh?! So to close the circle back from remote thar’ parts back to our web application is a simple matter of, in broad brush terms …

adding two new buttons called “Email Columns and Links …” and “SMS Columns and Links …” that …
set a global variable andlinkto = true; … setting in play, within the report writing code (that likes monospaced fonts) …
add a new links column to the right with URLs like …
https://www.rjmprogramming.com.au/HTMLCSS/wls_vs_php.htm?andgo=y&countries=Belize&capitals=Belmopan
… to tell your client programs to form the hyperlinks for us (if they are “of the mood”, that is!)

To improve user experience we use “dynamic” Javascript DOM HTML “style” attribute change means to easier close the “Colour Wheel” helper web application “above the fold” by changing the CSS z-index (Javascript DOM [element].style.zIndex) of elements accordingly, when the user clicks other elements. You can see all this with the first “thechanged” link above, where all “glow” CSS styling will also feature prominently.

Previous relevant Window SessionStorage Client Versus Server Integration Tutorial is shown below.

Window SessionStorage Client Versus Server Integration Tutorial

We hope, when performing a “software integration” task, that the two or more components of that integration work with each other’s talents, rather than a big tussle like reinventing the wheel. This ideal makes the work …

sometimes difficult but rewarding because …
the differences between two independent software components can be quite large and daunting … and the programmer has to see that …
care is applied so as not to wreck previous functionality and integrations in making the current integration work

… and that is why we’ve made corollaries to “building from scratch” (when planning and design is a huge component) can be a lot simpler than a software integration “renovation”, in the past, here at this blog.

Our primary integration today is to (software) integrate the great Weather Underground and its great API service for autocomplete name searches for weather (and hurricane) information. Why bother? Well, can you not envisage a user using that Ajax functionality of yesterday’s Window SessionStorage Client Versus Server Ajax Tutorial as a trip planner, perhaps, or as a “checking up on relatives overseas” tool, perhaps? And not all the capital cities are timezone places, and so for some of those we can use Weather integration to still show apt online information when click/touching a Countries Report row. Speaking of this “row”, we make an improvement whereby on a first click of a right hand (Country) row cell, that cell is not initially a contenteditable=”true” one (that may frustrate showing the keyboard on mobile, when most likely it was the row touch intended), but then becomes a contenteditable=”true” cell henceforth.

As a user experience improvement for “trip planners” perhaps, we allow the user to alphabetically sort the presented select (dropdown) element entries …

… controlled by a new dropdown in the left hand column header cell.

We also allow the user to move the iframe element with some positioning emoji buttons near the “Close” button one (of yesterday’s work).

Into the future, too, we’ll have more to say regarding the germination of an idea “to allow a mobile onmouseover simulator (of sorts)” be to allow the user to perform a swipe across an individual HTML element of interest on mobile platforms (ie. harness ontouchmove event) as per (so far) … kicked off by “<body onload=” setTimeout(athn, 5000); “>” …

… working with the new HTML …

<div id=divalert></div> </body> </html>

… to try to allow the “explainer of an element” advantages non-mobile platforms have for hovering over an HTML element with a title attribute filled in.

And so, yet again, see thechanged wls_vs_phphtm‘s CapitalCity Find Matching Country Report live run link’s new Weather integration functionality. It caused thechanged colour_wheelhtml‘s colour wheel (at this liverun link) to be affected (by integrations “up”).

Previous relevant Window SessionStorage Client Versus Server Ajax Tutorial is shown below.

Window SessionStorage Client Versus Server Ajax Tutorial

We have a few “clientside chestnuts” to use with our current Capital City Find Matching Country Report web application project today, those being …

Ajax functionality, kicked off by an “onclick” event set of logic, allowing mobile platforms to also have a look in (the look in that they miss when the event logic is off the “onmouseover” event)
iframe and its …
1. srcdoc attribute (“content” alternative to src “url” attribute) … along with, and crucially needing (because srcdoc ignores its own document.body onload goings on, that we need the “Iframe Client Pre-Emptive” methods below to circumvent) the …
2. onload event opportunity of an iframe element (we group into “Iframe Client Pre-Emptive” methods, here)

… adding onto yesterday’s Window SessionStorage Client Versus Server Canvas Tutorial.

It’s not that involved with the Ajax work today, given that there are no cross-domain issues, though there are cross-protocol (SSL https: versus non-SSL http:) issues to be careful about. Those can be addressed because the web application is recalled to present its “Country Report” and that is the opportunity to check on protocol navigation requirements.

Along the way, we also make this happen for the user on …

click/touching a table row … it sets off new “tr” (table row) element logic calling our (inhouse) Timezone and Wikipedia Place Information helper (HTML) via Ajax (so not leaving the webpage) … and because of place name oddities we allow for …
“td” (table cell) element user amendments by setting their contenteditable attributes to “true” (since fixed, but we found the Timezone Europe/Tirane pointing at Tirane in Albania used to be spelt “Tirana”)

… that latter methodology normally a technique we apply to “div” elements (so, there you are!)

Also used are “overlay” techniques, two of the “usual suspects” here coming into play, to present to the “Ajax content to srcdoc iframe arrangements” …

position:absolute property (with associated top and left (px defined) properties)
z-index

Yet again, see thechanged wls_vs_phphtm‘s CapitalCity Find Matching Country Report live run link’s new “Ajax” functionality.

Previous relevant Window SessionStorage Client Versus Server Canvas Tutorial is shown below.

Window SessionStorage Client Versus Server Canvas Tutorial

Yesterday’s Window SessionStorage Client Versus Server Share Tutorial dealt with ascii text clipboard copy assisted sharing options with our current Capital City Find Matching Country Report web application project. This suited both Email and SMS share options we coded for, but today’s extension of functionality from “ascii text” data to “graphical data” only suits Email sharing. The other caveat with our work is that no serverside (for us, PHP) help is allowed, so no PHP mail here.

What comes into play with a “graphical data” clientside (only) sharing approach? It will not surprise many readers that, for us, it involves …

canvas element … converting HTML table outerHTML “ascii text” data … via …
canvas drawing methods “[canvasContext].strokeRect()” and “[canvasContext].strokeText()” via “[cellElement].getBoundingClientRect()” … to convert that canvas element content via …
[canvasElement].toDataURL() … to an …
img element nested in a div contenteditable=true element … so as to hook in with today’s very useful helper link, thanks … use …
function tabletoclipboard(canvas) { // thanks to https://stackoverflow.com/questions/27863617/is-it-possible-to-copy-a-canvas-image-to-the-clipboard var img = document.createElement('img'); img.src = canvas.toDataURL(); var div = document.createElement('div'); div.contentEditable = true; div.appendChild(img); document.body.appendChild(div); // do copy SelectText(div); document.execCommand('Copy'); document.body.removeChild(div); } function SelectText(element) { // thanks to https://stackoverflow.com/questions/27863617/is-it-possible-to-copy-a-canvas-image-to-the-clipboard var doc = document; if (doc.body.createTextRange) { var range = document.body.createTextRange(); range.moveToElementText(element); range.select(); } else if (window.getSelection) { var selection = window.getSelection(); var range = document.createRange(); range.selectNodeContents(element); selection.removeAllRanges(); selection.addRange(range); } }
to leave the user’s device’s clipboard containing a useful table (with linework) … ready to …
paste into an email body section

… sharing off to an emailee collaborator.

Again, see thechanged wls_vs_phphtm‘s CapitalCity Find Matching Country Report live run link’s new “Email Table” button functionality.

Previous relevant Window SessionStorage Client Versus Server Share Tutorial is shown below.

Window SessionStorage Client Versus Server Share Tutorial

Yesterday’s Window SessionStorage Client Versus Server Tutorial has been amended today for two new sharing and collaboration options, those being …

… but you may well be familiar with the restrictions on email and SMS client (program) approaches to this, coming from HTML “a” link “mailto:” and “sms:” href property prefixes respectively. We’re going to need help with the 800 odd character (length) restrictions with the (resultant) web address (bar) URL, but what? How about working off the great advice of this wonderful link, thanks, to copy what we’d have assembled into an ascii text Report into the characters contained by the user’s device’s clipboard?

function copytoclipboard(str) { // thanks to https://hackernoon.com/copying-text-to-clipboard-with-javascript-df4d4988697f var el = document.createElement('textarea'); el.value = str; el.setAttribute('readonly', ''); el.style.position = 'absolute'; el.style.left = '-9999px'; document.body.appendChild(el); el.select(); document.execCommand('copy'); document.body.removeChild(el); }

An issue that springs up here using such clipboard ascii text content, whenever you get the Font choice given to you, pick a monospaced Font like Courier New or “Fixed Width”.

See thechanged wls_vs_phphtm‘s CapitalCity Find Matching Country Report live run link’s new sharing functionality.

Previous relevant Window SessionStorage Client Versus Server Tutorial is shown below.

Window SessionStorage Client Versus Server Tutorial

Sometimes it’s the case at this blog that we’d like to introduce a new topic, but do not do so, because we cannot show any real world (or real application) use of that concept. So it has been, up until now, with the concept of (web browser) window (object) sessionStorage property. But yesterday’s Window LocalStorage Client Versus Server Primer Tutorial represented an opportunity akin to when Haley’s Comet gets at its closest to the Earth … while you see a chance, take it … chance because of that nuance whereby we were not trying to store data for any other purpose than passing data onto …

a known entity … ie. same web application … at …
a known time … ie. immediately

… two conditions that make the code design “marginally” more ideal for the window object property concept of sessionStorage rather than localStorage, in that any …

localStorage.removeItem([knownLocalStorageName]);

… becomes superfluous as with sessionStorage data will disappear between web browser sessions, anyway.

We offer this new concept as a non-default option of a select (dropdown) element replacement to the h1 element hardcoding “localStorage” with thechanged wls_vs_phphtm CapitalCity Find Matching Country Report live run. The other nuance of difference with sessionStorage usage is that in the document.body onload event logic, we may as well (as part of other changes) pre-emptively look for, and if there, respond to, any found sessionStorage data points, even without the user having flagged it specifically …

Which beggars the question “What are the differences between sessionStorage and localStorage?” A quick reading might surmise that “the latter has an expiration date”. We leave you with an open ended Google search so that you may extend your readings on this.

Previous relevant Window LocalStorage Client Versus Server Primer Tutorial is shown below.

Window LocalStorage Client Versus Server Primer Tutorial

Even though we rave on a lot about serverside PHP and its $_POST method=POST (versus HTML/Javascript recipient via ? and & argument $_GET method=GET scenario) data length advantages as the recipient of an HTML form method=POST set of data that could be sizeable, we’ve just realized that there is a client Javascript and window.localStorage methodology that may help alleviate the need to involve PHP (and any other serverside intervention) on occasions.

Hint: Yes, we’ve raved on about this too?! Does the blog posting title give it away? Okay, yes, it should read “localStorage”, but thought we’d gone past such juvenile finickiness since the Whac-A-Mole controversy of 1st December 2019 (or even The Great Tea Trolley Disaster of ’67, we daresay).

It can even use a “self-destruct” approach to the use of this “localStorage” on having used it because …

the web application knows who is using it (localStorage) … and on having accessed and read it …
the web application knows it (localStorage) is of no use to any other user (in this web application’s case, at least)

… which is very pleasing for a Land Surveyor who likes to leave cow paddocks as they’ve seen them so to speak. Except it’s like having a ten tonne truck worth of data access in amongst the cow pats when having access to “localStorage” (or PHP), rather than a little piddle of calf wee (wee Metcalfes know a thing or two about these things!) data access of ? and & HTML/Javascript URL arguments (or even if we were to use HTTP Cookies).

It’s not as if we all have access to serverside language usage, though we do, because we really like PHP and MAMP and Apache/PHP/MySql web servers (and have arranged our development environment accordingly), but what if you are starting out in web development, and still want to allow for sizeable chunks of data with your web applications? Huh? Huh?! See the possibilities? Try our proof of concept CapitalCity Find Matching Country Report live run, and highlight a whole swathe of (multiple mode) dropdown option Capital Cities holding down the shift key before pressing the yellow “Report” button. If the URL ends up as …

https://rjmprogramming.com.au/HTMLCSS/wls_vs_php.html?capitals=localStorage&countries=localStorage

… that’s because the web application’s …

… HTML form onsubmit event logic …

discovered no PHP web application existant (via Client Pre-emptive Iframe techniques) … and …
discovered (in a sanity check feeling way) that to go down the proposed HTML form method=GET approach was risking a …
HTTP 414 "Request URI too long"
… web browser error … and that …
localStorage was a known web browser piece of functionality

… and so as per our localStorage logic we …

back out of the default HTML form method=GET navigation setup of the web application in favour of …
- storing that data into localStorage
- substituting into the URL ? and & arguments the hardcoding “localStorage” (and in so doing, getting back under the HTTP 414 “Request URI too long” limitation, piecing together (what amounts to) …
  location.href=document.URL.split(‘#’)[0].split(‘?’)[0] + ‘?capitals=localStorage&countries=localStorage’;)
  … that on a recall to this same web application a …
- document.body onload event piece of Javascript logic checks the localStorage for its incoming Capital City Country Report data, as per …
  var phpexists=false; var getcapitals=location.search.split('capitals=')[1] ? decodeURIComponent(location.search.split('capitals=')[1].split('&')[0]).replace(/\+/g,' ') : ''; var getcountries=location.search.split('countries=')[1] ? decodeURIComponent(location.search.split('countries=')[1].split('&')[0]).replace(/\+/g,' ') : ''; function checkforreport() { var divcont=''; var dcaps, dctys, idis; if (getcapitals == 'localStorage') { if (window.localStorage) { getcapitals=decodeURIComponent(localStorage.getItem('wls_vs_php_capitals')).replace(/\+/g,' '); localStorage.removeItem('wls_vs_php_capitals'); } else { getcapitals=''; } } if (getcountries == 'localStorage') { if (window.localStorage) { getcountries=decodeURIComponent(localStorage.getItem('wls_vs_php_countries')).replace(/\+/g,' '); if (getcapitals.replace('localStorage','') != '' && getcountries.replace('localStorage','') != '') { document.getElementById('myh1').innerHTML+=' <font size=1>... yes, it was needed</font>'; } localStorage.removeItem('wls_vs_php_countries'); } else { getcountries=''; } } if (getcapitals != '' && getcountries != '') { divcont='<table border=5 style="width:95%;vertical-align:top;background-color:white;"><tr style=background-color:#f0f0f0;"><th>Capital</th><th>Country</th></tr></table>'; dcaps=getcapitals.split('|'); dctys=getcountries.split('|'); for (idis=0; idis<dcaps.length; idis++) { divcont=divcont.replace('</table>', '<tr><td>' + dcaps[idis] + '</td><td>' + dctys[idis] + '</td></tr></table>'); } document.getElementById('dreport').innerHTML=divcont; } }
  … the localStorage.removeItem() representing that “self-destruct” nuance we were talking about before

We may well use this methodology in future projects, and hope it has been of some little interest to you as well?!

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