Trying to write better JavaScript, woohoo!
First step for me: YUILoader dependency loader so all of my custom code is available to use at a reliable point in time.
My current environment:
YUI (2.8.1) library path: C:\wamp\www\lib\js\yui\2\build\ (http://localhost/lib/js/yui/2/build/)
All YUI min, debug and raw files located in above location
Custom library path: C:\wamp\www\lib\js\ (http://localhost/lib/js/)
Custom Module 'fln-min.js' located in above location
Testing in Chrome
Notes:
Below is my example HTML page, my custom module follows the HTML code. No CSS or anything funky yet, I just want to get this working as a proof of concept. If you run my code, you'll see that both onSuccess events fire, but in the nested callback data is null, and my custom module seems to be unavailable. I've tried a few things, like the path concatenation, hence 'base' in the first YUILoader instance, and the commented out 2nd 'fullpath' in the 2nd YUILoader instance.
Demo HTML page:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>External file Loader</title>
<script src="/lib/js/yui/2/build/yuiloader/yuiloader-min.js"></script>
<script>
new YAHOO.util.YUILoader({
base: '/lib/js/yui/2/build/',
require: ['yahoo-dom-event'],
// require: ['yahoo-dom-event','reset-fonts-grids','container'],
// allowRollup: true,
// combine: true,
onSuccess: function() {
alert('YAHOO: '+YAHOO);
var loader = new YAHOO.util.YUILoader();
//
loader.addModule({
name:'FLN',
// varName:'FLN',
type:'js',
fullpath:'/lib/js/fln-min.js'
// fullpath:'../../../fln-min.js'
});
loader.onSuccess = function(o) {
//
alert('o.data: '+YAHOO.lang.dump(o.data));
alert('FLN: '+FLN);
//
};
loader.onFailure = function(o) {
//
alert('Error: '+YAHOO.lang.dump(o));
//
};
loader.insert();
}
}).insert();
</script>
</head>
<body>
<div id="output"></div>
</body>
</html>
Custom module (fln-min.js):
var FLN = function(){
var _debug = false ;
var _masterDebug = false ;
return {
loaded: function(){ return true; }
}
}();
alert('...');
The correct answer was: new Loader() #1's config object was missing the custom module key name FLN from its requires array.
Related
first of all I'm relatively new to javascript. So I'm sorry if my question is dumb. I would like to draw a molecule on my webiste by using this tool https://github.com/rdkit/rdkit-js. I also found an example here https://iwatobipen.wordpress.com/2021/12/29/create-desktop-chemoinformatics-application-with-js-chemoinformatics-rdkit-js/comment-page-1/. This example works in my case but when i try to invoke a function to draw a molecule as a .svg without using the example code, I fail. I get this error-message in my browser:
Uncaught ReferenceError: RDKit is not defined
at drawmol (results:21:15)
at results:33:5
In the following code example you can see the first case where it works and the second case were it doesn't. In both cases i use the same function.:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://unpkg.com/#rdkit/rdkit/dist/RDKit_minimal.js"></script>
<title>Document</title>
<script>
window
.initRDKitModule()
.then(function (RDKit) {
console.log("RDKit version: " + RDKit.version());
window.RDKit = RDKit;
})
.catch(() => {
});
</script>
<script> var drawmol = function() {
var mol = RDKit.get_mol("C1=CC=C(C=C1)O"); // the string here is a string representation of chemical molecules, it could also be something like "CO" or "CCCCC", shouldnt be important
var svg = mol.get_svg();
document.getElementById("drawer").innerHTML = svg;
};
</script>
</head>
<body>
<button type='button' onclick='drawmol()'> <!-- this works -->
draw
</button><br>
<script>
// drawmol() //this doesnt work
</script>
<div id='drawer'></div>
</body>
</body>
</html>
Later i would like to use the module to dynamically make those images. I use django as the framework. In this case i tried to present a minimal example without the django stuff.
Thanks in advance for your effort!
You are calling drawmol() before RDKit is ready.
To fix this, place it after RDKit is loaded:
window
.initRDKitModule()
.then(function (RDKit) {
console.log("RDKit version: " + RDKit.version());
window.RDKit = RDKit;
//Now RDKit is loaded you can safely call drawmol()
drawmol();
})
.catch(() => {
});
I can't even find a hint of an answer to this question anywhere, so maybe I'm totally barking up the wrong tree...
I'm making a javascript namespace, inside of which I am putting a constructor function:
var SEP=SEP||{};
SEP.person=function(name)
{
this.name=name
this.sayName=sayName
function sayName()
{
return this.name;
$(document).ready
(
function()
{
$('body').css('background', 'red');
}
);
}
}
Then I am calling the function from the HTML...
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>test</title>
<meta name="generator" content="BBEdit 10.5" />
</head>
<body>
<script src="libraries/jquery/javascript/jquery-1.11.0-min.js"></script>
<script src="libraries/sep/javascript/sep.js"></script>
<p>Hello</p>
<script>
var bob=new SEP.person("bob");
word=bob.sayName();
document.write(word);
</script>
</body>
</html>
Question one is, why doesn't this work?
Question two is how can I make it work?
Question three is, if I want to make a more involved constructor, with JQuery peppered thoughout, do I need to do the document ready thing over and over, or is there a better way?
Many thanks in advance.
Actually your constructor is working fine. But you should not use document.write in your code. Instead you can append the value to a html tag, using either .append() .html() or .text() methods. Also there should be a small change in your sayName() method, Css should apply before return. Otherwise it will not hit on those lines of code.
var SEP = SEP || {};
SEP.person = function (name) {
this.name = name
this.sayName = sayName
function sayName() {
$('body').css('background', 'red');
return this.name;
}
}
var bob = new SEP.person("bob");
word = bob.sayName();
$("span").text(word);
Demo
I made a few changes to the MEjs demo player, to enable playback of OGG in IE/Safari browsers, using the Cortado Java applet.
I have play/pause working, and although getPlayPosition() isn't getting the current position in milliseconds as described in the documentation, applet.currentTime and applet.duration work well for this purpose.
I thought it would be simple to hook these up to the current position indicators on the mejs player, but I'm running into a problem. setCurrentTime on the object is causing DOM Exception: InVALID_STATE_ERR (11) in IE, and a similar error happens in Safari. Apparently the object I'm trying to set no longer exists?
The code below will play and pause, and even give the seconds/total in the console (F12 tools MUST be enabled in IE.) Is there a good way to connect this to the play bar?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>HTML5 MediaElement</title>
<script src="../build/jquery.js"></script>
<script src="../build/mediaelement-and-player.js"></script>
<link rel="stylesheet" href="../build/mediaelementplayer.min.css" />
</head>
<body>
<h1>MediaElementPlayer.js</h1>
<p>Audio player</p>
<h2>OGG Player</h2>
<audio id="player2" src="http://www.archive.org/download/memoirs_holmes_0709_librivox/holmesmemoirs02doyle.ogg" type="" controls="controls">
</audio>
<script>
MediaElementPlayer.prototype.buildplaypauseOrig =
MediaElementPlayer.prototype.buildplaypause;
MediaElementPlayer.prototype.buildplaypause = function(a,b,c,d) {
if (d.src.indexOf('.ogg') !=-1 /* && IE or safari */) {
if (jQuery(this.$node).find('applet').length==0) {
jQuery(this.$node).append('<applet code="com.fluendo.player.Cortado.class" codebase="http://theora.org/" archive="cortado.jar" width="100" height="100">'+
'<param name="url" value="'+d.src+'"/><param name="seekable" value="true"/><param name="autoPlay", value="false"/></applet>');
}
var el = this.$node; //mejs audio element
var initonload = function() {
if (el.find('applet')[0].isActive) {
var applet = el.find('applet')[0];
// This is where it fails: mejs.players[0].setCurrentTime or d.setCurrentTime cause dom exception
console.log(applet.code);
console.log(applet.currentTime);
/*mejs.players[0]*/ //d.setCurrentTime(applet.currentTime);
console.log(applet.duration);
/*mejs.players[0]*/ //d.media.duration = applet.duration;
} else {
window.setTimeout(initonload,100);
}
}
d.addEventListener("play",function() {
var audio = el.attr('src');
window.setInterval(function() {
//try {
var applet = el.find('applet')[0];
console.log(applet.currentTime);
// This is where it fails: mejs.players[0].setCurrentTime or d.setCurrentTime cause dom exception
//mejs.players[0].setCurrentTime(applet.currentTime);
console.log(applet.duration);
/*mejs.players[0]*/ //d.media.duration = applet.duration;
//}catch(e) {console.log(e)}
//console.log(applet.getPlayPosition()+"ms");
},1000);
//jQuery(this).find('applet')[0].setParam('url',audio);
el.find('applet')[0].doPlay();
});
d.addEventListener("pause",function() {
var applet = el.find('applet')[0];
applet.doPause();
});
d.addEventListener("load",function(e) {
alert('load');
});
}
this.buildplaypauseOrig(a,b,c,d);
}
mejs.HtmlMediaElementShim.determinePlaybackOrig =
mejs.HtmlMediaElementShim.determinePlayback
mejs.HtmlMediaElementShim.determinePlayback = function(htmlMediaElement, options, supportsMediaTag, isMediaTag, src) {
var res = this.determinePlaybackOrig(htmlMediaElement, options, supportsMediaTag, isMediaTag, src);
//if (mejs.MediaFeatures.isIE) {
res.method = 'native';
//}
return res;
}
$('audio,video').mediaelementplayer();
</script>
</body>
</html>
This is using MeJS 2.10.3.
[EDIT]
After inspecting the MediaElement.js code, it seems that mejs.players is not an array, but an object, and in order to access the first player, you would have to look into mejs.players['mep_0'], since mejs.players[0] would be undefined.
My guess would be that jQuery fails to create an interactive <applet> element, since, from my experience, jQuery (which heavily relies on document.createDocumentFragment) sometimes fails to attach/trigger events on dynamically created/cloned DOM nodes, especially in IE, which could be the cause for this DOM error that you're seeing, because your <applet> object probably failed to initialize.
To try and fix this problem, I'd suggest to use the native document.createElement and document.appendChild methods instead of the jQuery.append.
if (jQuery(this.$node).find('applet').length==0) {
var createElem = function(name, attributes) {
var el = document.createElement(name);
attributes = attributes || {};
for (var a in attributes) {
el.setAttribute(a, attributes[a]);
}
return el;
};
var applet = createElem('applet',{
code:'com.fluendo.player.Cortado.class',
codebase: 'http://theora.org/',
archive: 'cortado.jar',
width: 100,
height: 100
});
applet.appendChild(createElem('param', {name:'url', value:d.src}));
applet.appendChild(createElem('param', {name:'seekable', value: 'true'}));
applet.appendChild(createElem('param', {name:'autoPlay', value: 'false'}));
this.$node.get(0).appendChild(applet);
}
I have this working pop up HTML code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://gmpg.org/xfn/11">
<title>PopUp</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" media="all" href="style.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript" src="js/jquery.popup.min.js"></script>
<script type="text/javascript">
jQuery(function () {
jQuery().popup();
});
</script>
</head>
<body>
Show popup
<div id="popup-box">
This is the pop up content. The quick brown fox jumps over the lazy dog.
</div>
</body>
</html>
The actual pop up content is inside the:
<div id="popup-box">
</div>
Is it possible to transfer the pop up HTML content (..) to my JS file? Actually inside the jQuery function click event? Example:
jQuery( document ).ready( function($) {
$('#triggerforpopup').live('click',(function() {
//launch the pop code to HTML
}));
});
So after the click event, the JS will simply pop it out, but it's originating inside the JS file not an HTML hidden on an existing content.
The reason is that I'm writing a Wordpress plugin and it would be convenient to have all this information in a JS file. I don't want putting additional HTML code in the existing template content which is hidden by default.
Thanks for helping.
UPDATE: I have created a fiddle for this one here: http://jsfiddle.net/codex_meridian/56ZpD/3/
(function (a) {
a.fn.popup = function (b) {
var c, d = [self.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft, self.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop];
a("body").append(c = a('<div id="popup-overlay"></div>')), _init = function () {
_add_overlay(), _add_buttons(), a("#popup-box #popup-content").css("max-height", a(window).height() - 400), a(window).on("resize", function () {
a("#popup-box #popup-content").css("max-height", a(window).height() - 400)
})
}, _add_overlay = function () {
c.css({
opacity: .85,
position: "absolute",
top: 0,
left: 0,
width: "100%",
"z-index": 99999,
display: "none",
height: a(document).height()
})
}, _show_overlay = function () {
c.is(":visible") || c.fadeIn("fast")
}, _hide_overlay = function () {
c.is(":visible") && c.hide()
}, _add_buttons = function () {
a("a[rel=popup-close]").click(function () {
return _hide_box(), !1
}), a("a[rel=popup-open]").click(function () {
return _show_box(), !1
})
}, _show_box = function () {
if (!a("#popup-box").is(":visible")) {
_show_overlay(), a("#popup-box").fadeIn("fast");
var b = a("html");
b.data("scroll-position", d), b.data("previous-overflow", b.css("overflow")), b.css("overflow", "hidden"), window.scrollTo(d[0], d[1])
}
}, _hide_box = function () {
if (a("#popup-box").is(":visible")) {
var b = a("html"),
c = b.data("scroll-position");
b.css("overflow", b.data("previous-overflow")), window.scrollTo(c[0], c[1]), _hide_overlay(), a("#popup-box").hide()
}
}, _init()
}
})(jQuery)
You can write your content directly in your JS as a string and then use the innerHTML property of elements to set their value. You can do this in pure JS as follows.
var popup = document.getElementById("popup-box");
var html = "This is the pop up content. The quick brown fox jumps over the lazy dog.";
popup.innerHTML = html;
And you can do this in jQuery as follows:
$('#triggerforpopup').on('click', function() {
$("#popup-box").html(html); // Where html is a variable containing your text.
});
Note: You can write in HTML tags and the like in your html string and they will be rendered as you would expect on the page. You are not limited to plaintext.
Note: live has been deprecated in jQuery as of jQuery 1.7. It has been replaced with on. See http://api.jquery.com/live/ and http://api.jquery.com/on/.
If you want to include everything in the JavaScript as mentioned in the comments, you can do this:
var popup = document.createElement("div");
popup.id = "popup-box";
popup.innerHTML = "your html here";
document.getElementById("parent element id").appendChild(popup);
What this does is create a new div element, set its id and then append it as the child element of the parent of your choice. You could just do a plain insert of the HTML string into another element, but by creating an element here you have a bit more flexibility regarding its placement.
use
var popupHtml = $('<div>This is the pop up content. The quick brown fox jumps over the lazy dog.</div>');
popupHtml.popup();
I found lots of issues in the popup plugin you have used. Fixed them to make it working. Have a look http://jsbin.com/oyamiy/6/watch
I want my TextArea to be able to support multiple CodeMirror modes. For now I want it to support json and xml. Is this possible?
Also, is it possible to automatically detect whether the user placed json or xml in the area?
Thanks.
CodeMirror actually has an example very close to what you are looking for here.
Here is a more specific example that does what you want.
Create a CodeMirror instance.
When the content changes we determine if we should switch modes.
The logic I put in for determining what mode you are in is very simplistic and can be refactored to support as robust a check as you deem appropriate for either mode. (Regex is good for complex checking if you want to get fancy...that is the only reason I used it even in my simple example) Currently, my example code just checks for any content where the first non-space character is "<" thus indicating xml mode. When deciding to switch back it just checks that the first non-space character is not "<" and that it is not blank (in case the user just deleted everything to start over with more xml).
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Code Mirror Example</title>
<script src="lib/codemirror.js"></script>
<link rel="stylesheet" href="lib/codemirror.css">
<script src="mode/javascript/javascript.js"></script>
<script src="mode/xml/xml.js"></script>
<style type="text/css">.CodeMirror{border:1px solid black;}</style>
</head>
<body>
<div><span>Mode: </span><span id="modeType">JSON</span></div>
<textarea class='codeEditor'></textarea>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
function determineCodeMirrorType(cm)
{
if (cm.getMode().name == 'javascript')
{
checkAndSwitchToXML(cm, cm.getValue());
}
else if (cm.getMode().name == 'xml')
{
checkAndSwitchToJSON(cm, cm.getValue());
}
}
function checkAndSwitchToXML(cm, val)
{
if (/^\s*</.test(val))
{
cm.setOption("mode", "xml");
$('#modeType').html("XML");
}
}
function checkAndSwitchToJSON(cm, val)
{
if (!/^\s*</.test(val) && val.match(/\S/))
{
cm.setOption("mode", "javascript");
$('#modeType').html("JSON");
}
}
function buildCMInstance(mode, value)
{
var cm = CodeMirror.fromTextArea($('.codeEditor')[0], {
mode:mode,
value:value,
lineNumbers:true,
onChange:function(cmInstance){
determineCodeMirrorType(cmInstance);
}
});
return cm;
}
$(document).ready(function(){
//mode changing demo: "http://codemirror.net/demo/changemode.html";
var cm = buildCMInstance("javascript");
});
</script>
</body>
</html>