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  1. DILEMMA: I have a fairly complex JSON object that is introduced via an AJAX call. Unfortunately, my control panel tells me that it is undefined. Is this because it has no value? Or, is it because I do not know how to read the value properly? {"lastVisits"[{"firstVisit":{"prettyDate":"Monday, May 14, 2018"}}]} The name of the variable into which it is read is visitor_data. Am I reading the value of correctly? visitor_data.lastVisits[0].firstVisit.prettyDate Roddy
  2. DILEMMA: Visitors to the mainpage of my website can fill the middle section of the page from the page's navigation bar in either of two ways. Both ways employ Javascript: one, copy a div already on the page into another div on the same page; and two, copy the contents of a div on a another page into same. What I would like to do now is to copy the contents of a div already on the page with a call from the contents of a div that was previously on another page. QUESTION: How does one get a div to replace its own content when the div whose contents needs to be replaced has been filled w
  3. The DILEMMA: Recently I discovered how to enable responsive design on my website's main page. Although the page itself is now responsive, the splash panels that are associated with it are largely dysfunctional. Having experimented in various ways to make these latter responsive as well, I have decided to simply eliminate them on mobile devices. What is the best way to do this? Already I have combined PHP and Javascript to suppress the splash panels in the same session. So, my question is what is the best way to recognize any mobile device? Roddy
  4. BACKGROUND: Working with Matomo has compelled me to dig deeper into the way that information gets passed over the internet. Up until now I have assumed that I can pass just about anything in a query string. In fact, this is exactly what I have been doing. What I am beginning to realize is that the PHP $_POST and $_GET variables have been doing work of which I was not aware. I have come to this conclusion with my new encounter of the encodeURI(), encodeURIComponent(), decodeURI(), and decodeURIComponent() functions. Indeed, I have read that no information can be passed in an HTTPRequest
  5. Hello I have the following javascript code.It is suppose to execute when the html page is done loading but in stead it executes and then nothing happend (the page seems like it is loading something but nothing ever happens) Here is my code : function LoadXML() { if(window.XMLHttpRequest) { var xmlhttp = new XMLHttpRequest(); } else{ var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function () { if (this.readyState == 0) {
  6. I'm using somewhat unusual navigation, as seen here. When a user mouses over the bars, they slide out into view. All of that is working fine. The problem is, I cannot find the CSS to make the buttons align left of the edge of the screen (as seen in the image), regardless of the display dimensions. I originally tried: <style> #container {width: 600px; height: 25px; position: relative;} #bar0, #bar1, #bar2, #bar3, #bar4, #bar5 {position: absolute; left: -340px;}"; </style> Which worked perfectly. But only on my scre
  7. i want to build a bar chart with chartJS and database mysql with two different query, but bar chart not showing. can anyone help me to correct the code? this my query and javascript: <?php $a = mysqli_query("select count(a) as total1 from tbl"); $b = mysqli_query("select count(b) as total2 from tbl"); ?> <body> <div> <canvas id="chart"></canvas> </div> <script> var ctx = document.getElementById("chart"); var chartdata = { labels: 'CHART', datasets: [{ label: "A", dat
  8. Please find below the Javascript insertion <script> tag that Matomo uses to track user behavior on a webpage. <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//{$PIWIK_URL}/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', {$IDSITE}]); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.j
  9. Ok, so I have 4 combo boxes with $Year, $Month, $Type, $extension to create file name of URL. http://www.myOrg.Org/Articles/$Month + $Year + MyOrg + $Type . $extension This is what I have (doing only 1 variable - Year). <form> Select the year: <select id="mySelect"> <option>2018</option> <option>2017</option> <option>2016</option> <option>2015</option> </select> Select the month: <select id="mySelect1"> <option>January</option> <option>Februar
  10. Hi everyone, A few weeks ago, Douglas Lowder from Salesforce made a brilliant talk about his port of React Native for Apple Tv. I was thinking that it could interest some here to see him describes how he did it. Thanks!
  11. This seems so simple: var aC = document.getElementById("arrowCanvas"); var context = aC.getContext("2d"); var img = document.getElementById("arrowImage"); context.drawImage(img, 225, 225); context.rotate(90 * Math.PI / 180); But the canvas never rotates. Also tried: var aC = document.getElementById("arrowCanvas"); var context = aC.getContext("2d"); var img = document.getElementById("arrowImage"); context.rotate(90 * Math.PI / 180); context.drawImage(img, 225, 225); But here, the canvas never even shows up.
  12. I'm having a problem determining if a given control has focus. It seems to me that: if (form.password.focus() == true) ... should tell me if the form's password control has focus. But, it's returning "false" even while I'm typing into the control. So, what is the correct way to determine whether a control has focus? Thank you!
  13. I need to create variable names in a loop (part of this seems to be working) and then get 26 of the 39 variables to perform simple math (for example: variable -= 10). Getting the variables recognized as variables, and not text, seems to be the issue. This works properly, it accesses 13 canvases named canvas1 through canvas13: for (i = 1; i < 14; i++) { c = document.getElementById("canvas" + i.toString()); context = c.getContext("2d"); ... } However, when I try to dynamically create canvas names, and dynamically create 2 variables
  14. BACKGROUND: Earlier I posted a script from Matomo that serves as a counter for page hits and various other bits of information gleaned from a user's behavior on a webpage that bears the script. Although I now understand what the code does, I would like to understand its purpose. In particular, I would like to understand the probable reason for assigning to a variable another variable with the same name. The full code is given as: <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (f
  15. smus

    Array cloning

    Sorry for stupid question. I can't understand the purpose of cloning an array in JS. Why do we need it? What is the difference between: let a = []; let b = a; and: let a = []; let b = a.slice(0);
  16. Although by no means fully recovered from a recent machine failure, I am back on the road in a much weakened condition. Please consider the following piece of code and correct me where my interpretation of the code is in error. <!-- Matomo --> <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//{$PIWIK_URL}/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', {$IDSITE}]); var d=document, g=d.createElement('script'), s
  17. Hello I need to get the value of a CSS Filter, Hue in this case, that's currently being applied to a canvas. I tried this: var hue = document.getElementById('canvas1').style.filter('hue-rotate'); and it did not work, several variations on that theme also failed. What is the correct syntax? Thank you very much PS: this could apparently also work var hue = getComputedStyle(canvas1).filter But it will not retrieve just the hue. Thank you
  18. I am going to create a Extension for internet explorer but i am not able to understand how to start creating Extension for internet explorer.
  19. I have searched in vain for an answer to this problem, but I am getting no where. Here is the issue: I have a search form that works fine as a desktop application. On mobile devices there is a problem. If a user starts typing in the search input, and then taps one of the words that pops up in predictive text (such as on an iphone), this word then fills the input. The search form returns no matches because, as I have discovered, the only thing being submitted is what the user actually typed before tapping the predictive hint. For example, if they start typing Pennsylvania but only type "P
  20. We had a ton of problems with React to handle our states. We adopted Redux, and after a short period we could finally just focus on producing features and not bugs Here is a video of the last meetup we did in San Francisco: Using Redux at scale. Here is the source medium article for those who cannot listen to the video: https://blog.matters.tech/10-redux-tips-from-the-trenches-55e06ed1c0a8
  21. I tried including the 'tab.html' and ‘content.html’ into my 'index.html' (using w3school code: how to include HTML, found at: https://www.w3schools.com/howto/howto_html_include.asp), but the javascript and css elements do not work. The buttons don't work as intended. Look at: https://rads-198409.appspot.com If you minimize the browser window, the tab is supposed to change to a drop-down menu, but the button does not work at all. I have checked the individual pages and they seem to work just fine, just not when they are combined. Am I doing something wrong? Could someone help? All th
  22. I have a form written using HTML5 and CSS3, final validation is performed on submit with JavaScript. Then, the form will be sent to the server, most likely using PHP's mail() function. I don't recall how to include two items such as these in a form's action="...", I'd deeply appreciate if someone could refresh my memory! Thank you
  23. REQUEST: Please compare the results in the middle panel of the following two actions: ACTION ONE: Click on the phrase Weekly Podcasts under the heading Products in the navigation bar of the Grammar Captive mainpage. Scroll to the bottom of the page and view how the middle panel exceeds the height of the navigation bar and side panel. ACTION TWO: While on the same page with the same panel open click on the phrase Click and Listen. This will bring you to a different document in the same window. Notice that the middle panel does not exceed the height of the na
  24. Suggestion 1: I had an idea for w3school for a very long time and this idea will help people learn better and even make school suggest it more. Add in a tutorial where people will have to figure how how to fix codes like it's almost like the try-it-out but you have to go through courses and learn programming through that, almost like khan academy almost except with programming except khan academy only teaches html and not PHP. And also it wouldn't hurt to show videos of how to understand PHP more. And also how to create websites like facebook and youtube and have interactive videos as well l
  25. I'm trying to use Base64 to compare two images to see if they are identical. The images are accessed using: var thumb5Original = ""; var thumb5Edited = ""; thumb5Original = canvas5.toDataURL('image/png'); thumb5Edited = canvas5.toDataURL('image/png'); I then check them using this: if (thumb5Original.toString() == thumb5Edited.toString()) document.getElementById('tHeader5').innerHTML = "Original Image"; if (thumb5Original.toString() != thumb5Edited.toString()) document.getElementById('tHeader5').innerHTML = "Edited Image"; The problem is, I'm getting "Edited Image" e
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