Quadratic Equation Inline HTML Email Tutorial
Mathematicians out there will know that …
- Quadratic Equation solutions as quizzed about with today’s feature web application of HTML/Javascript Quadratic Equations Game Tutorial …
- can benefit from the visual aspects of drawing Parabolae (as with yesterday’s Parabola Quiz Google Chart Tutorial)
… and the linkage here got us to thinking and wondering whether the Quadratic Equation web application could benefit from Inline HTML Email Form integration. We had a 4:06 minute meeting and decided that, yes, we could have performed the meeting in reverse with no adverse impact … but we digress?! Yes, that would be nice.
And, cutting to the chase, what was the biggest issue? Sorry to disappoint with the answer that isn’t “Ajax issues”, that isn’t “event violation time limits on Safari when a prompt window hangs off an onclick event piece of logic”, that isn’t “input type=text focus not happening on mobile issues” … but is … dah, dah dah dah dah dah, dah, dah dah … the ” + “ (ie. plus) character. It has been the “Inline HTML Email” theme baddie of the week around here. Why? Because it gets lost in translation …
… a lot getting to Inline HTML Emails largely, we have no doubt, because the “+” character is PHP urlencode(” “) (ie. what blanks go from a form and over to the recipient as, quite often … ie. when not the “%20″ that encodeURIComponent(” “) produces).
And so, the recent Tic-Tac-Toe Two Email Players via Inline HTML Email Bugs Tutorial …
- Gmail webmail email client has a great feature to the right top of an opened email with the (ol’) three (vertical) dots menu and its “Show original” option, that in our Inline Email Form option (down the report) shows the HTML our web application “got through” to the Gmail client email application … noting that “got through” is not always the same as “meant to get through” …
… debugging tool is the best one to use to track down such a problem. By the way, today’s work, for the first time for a while, viewed much better in Gmail Webmail rather than (the view where some emojis did not translate as well in) Apple Mail.
In some situations it won’t work but for today’s work, what fixed this, was to, just before creating the Inline HTML Email Form via PHP mail we made one timely and crucial Javascript regular expressions (RegExp) replace as per …
document.getElementById('formtable').value=encodeURIComponent('<body><meta charset="utf-8"/><form action=' + document.URL.split('?')[0].split('#')[0] + ' method=GET>' + document.body.innerHTML.split('<if' + 'rame ')[0].replace(document.getElementById('demail').outerHTML,'').replace(' id="unknown"',' name="unknown" id="unknown"').replace(/\ \+\ /g, ' ' + String.fromCodePoint(10133) + ' ') + '<input type=hidden name=oklist value="' + oklist + '"></input><input type=hidden name=url value="' + url + '"></input><br><br><input style="margin-left:300px;display:inline-block;background-color:yellow;width:10%;" type=submit value=Check></input></form></body>');
And so there is now a new “Quadratic Equation Quiz” component to this “Quadratic Equation DotDotDot Sentence Game” web application for you to try with the live run that you could call quadratic_chalkboard.html and which changed in this way.
Previous relevant Parabola Quiz Google Chart Tutorial is shown below.
Parabola Quiz Google Chart Tutorial
We’ve found a new reason to tinker with deliberate image blurring on top of the usual …
- hiding sensitive data on images (where we find Gimp very good to use)
- as an SVG filter as used in Gimp Guillotine Follow Up SVG Filter Tutorial
- video blurring effects (via CSS “blur” filter) as shown at Video via Image Filter and Canvas Magnifier Tutorial … and now, today, we’re interested because …
- a game we’ve opened up to being an Inline HTML Email Form quiz benefits from having a “blurred” (actually bad resolution) image presented in an email
… stemming from a renewed desire to exhaust our interest in …
- data-URI image
- Inline HTML Email
… readily admitting that Gmail Webmail (email client) is a no go, but Apple Mail is a go, so we will offer an “a” link alternative for those email clients that do not allow data-URI images.
Our other interest was whether we could involve Google Charts directly in an Inline HTML Email. Well, it pans out … “not directly” … but what if we make use of the great Google Page Insights webpage screenshotting “smarts” (that we combine with Ajax). We were wary of URLs presented to Google Page Insights that involved “&” (second and on) argument delimiters, but on revisiting this, pleasantly surprised by these URLs working to …
- present a Google Chart after asking the user for graph drawing parameters
- those parameters allowing for a quiz emailee address to be defined, in which case …
- the PHP web application, building on the previous one of Mathematics Equation Google Chart Line Chart Primer Tutorial calls Google Page Insights to receive a data-URI string as the “src” parameter for an “img” element that shows …
- in an Apple Mail (but not Gmail Webmail) email this data-URI (user defined parabola) image shows very blurry, too blurry to make out the numbers, so …
- as a quiz for that emailee we can ask them to try to guess what the user placed for …
y = ?x2 + (?)x + (?)
… but … - to avoid too much frustration, we offer a pretty helpful “Hint” link both for Gmail Webmail users (who will not see that data-URI image) and other users a tad worried by image blurriness you can see in today’s animated GIF presentation
And so there is now a new “Parabola Quiz” component to this Parabola Equation PHP (and Google Chart Line Chart interfacing) web application for you to try with the live run that you could call parabola_lgraph.php and which changed in this way.
Previous relevant Mathematics Equation Google Chart Line Chart Primer Tutorial is shown below.
Mathematics Equation Google Chart Line Chart Primer Tutorial
In the recent Mathematics Equation Backtracking Game Primer Tutorial we found that there was not much to do to consider the drawing and display of a straight line by saying the a in …
Y = aX2 + bX + c
… is zero … and this turned the parabola data our Google Chart Parabola Line Graph code was initially designed for, into code that could display a straight line. But what about other equations? Well, we think the same code should suffice for that too, though we have to rearrange a fair bit more for that idea in the code, and ask a lot of the user. They use the ^ for “power of” for instance, and we’re sure we’ll think of more issues with requirements on this as time goes on, but the initial extension to functionality thoughts here swirled around equations where the most complex it gets for a parabola is “to the power of” 2. What about equations of curves of other powers bigger than 2 and less than 1, including negative powers. Given some suitable entries by the user, this is now possible using this same one codebase utilising the Google Chart Line Chart web application interface with this live run that you could call parabola_lgraph.php and which changed in this way. So you can look at today’s tutorial picture, and below we’d like to show you a Cubic Polynomial, as we found discussed at this useful link, thanks.
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