The mystery of '$.md5 is not a function' - javascript

I have a js code that uses jQuery.MD5 library. It works perfectly on my server:
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://example.com/static/js/jquery.md5.js"></script>
</head>
<body>
<script>
// my code goes here (declaring variables and functions)
var code = $.md5('mystring');
// and a little more code
</script>
</body>
But then I upload it to a web application (which I cannot control), that makes it look like this and puts it into an iframe:
<head>
<script>
// some extra variables are declared here
// double-checked that nothing here can break my code
</script>
</head>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://example.com/static/js/jquery.md5.js"></script>
<script>
// some code
var code = $.md5('mystring');
// some code
</script>
</body>
And this code starts giving me the $.md5 is not a function error. Strange thing. Tried clearing the cache, putting jquery.md5.js code directly into mine, nothing works.
Note that all the code works on my machine, so there must be no problem with my JS.
Update: the problematic code behavior seems to be unpredictable, meaning that sometimes it works fine with no changes.
What can be wrong?

Hm... That's a little embarrassing, but the problem was in jQuery. The one I included in my iframe conflicted with the one included in the page. Somehow this lead to "hiding" my $.md5 function after its code's end.
And yeah, I know, it was quite obvious that jQuery could cause problems.

If you want to use jQuery md5 function you should have import jquery.md5.js file in your project.
Steps-
Download jquery.md5.js file from https://github.com/placemarker/jQuery-MD5
Copy this file into your source folder. (ex: assert/theme/js)
Import that js file to your project.
(ex: <script src="<?= base_url(); ?>/public/assert/theme/js/jquery.md5.js"></script>
)
That's it! You are done!

Related

javascript including math.js

I am trying to call the Math.matrix() function, and I am quite certain I am not importing the file correctly into my javascript code. I have read through the StackOverflow question "how to include and use math.js": and given that advice, I have the following :
<HTML >
<!DOCTYPE html>
<head>
<script src=https://cdnjs.cloudflare.com/ajax/libs/mathjs/5.1.1/math.js>
</script>
<script type="text/javascript" >
function rotate_clockwise(){
/* code skipped */
matrix = Math.matrix(matrix, rotationmatrix);
}
</script>
</head>
<body>
</body>
</HTML>
where the cdns reference I have taken from this link
But on run when rotate_clockwise is called via slider the chrome 68 debugger states Uncaught type error : Math.matrix is not a function, so I do believe I am not including this file correctly.
My base assumption is that including a file once, in one set of script tags, is enough for any javascript function to use this library, which resides within a different set of script tags.
Thanks so much for any assistance you can provide.
I think you need math.matrix(...)--lower case math since Math is a standard JS library.

Javascript(Jquery) executes in HTML header but not not when in an external JS file

I know this stuff has been asked before...but I am a bit confused about this still. I have my index.html file and I have a script tag linking to my external JS file. If I only have that script tag the JS does nothing, but if I copy the JS and paste it into it's own script tag in the HTML header it works just fine. There's gotta be something I'm missing with Jquery.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script src="jquery-3.2.0.js"></script>
<link rel="stylesheet" href="FinalProjectCss.css">
<title>Dustin Naylor - Final Project</title>
<script src="FinalProjectJS.js"></script>
<script>
$(document).ready(function(){
$(".section").click(function(){
if($(this).next().is(":hidden")) {
$(this).next().slideDown("fast");
} else{
$(this).next().hide();
}
});
});
</script>
</head>
<body>
<span class="section">Click Me</span>
<div class = "hiddenDiv">
Oh hey there.
</div>
</body>
</html>
So the code in the last script tag that is Jquery stuff is exactly copied into a separate JS file named FinalProjectJS.js. In the current state this code is in it works as desired, but when I remove that chunk of code from the html file it doesn't work....Sorry for my nubishness, I'm rather new and any help would be great! thanks!
Can you write the contents of your jquery file: FinalProjectJS.js? The syntax for calling the external file seems to be correct. So I'm thinking it might be something about the path or the jquery external file contents itself. Make sure you don't include <script> tags on that file. Here's a sample.
Another thing, last time I've worked with jquery, I can't directly see it take effect when both my files are stored locally. It had to be stored in a server first, then accessed by my PC. Only then did my jquery took effect. A dev I worked with added some text to my Google Chrome's properties (target) so that even if my file is not stored in a server, I can see jquery take effect even if both my HTML and jquery files are stored locally.
...sorry, I'm not allowed to comment yet to clarify your post.
You must add the jQuery script tag before FinalProjectJS.js for the jQuery snippet to work.
<script src="https://code.jquery.com/jquery-3.2.1.js"
integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
crossorigin="anonymous">

Sometimes jQuery plugin is not loaded

I am using jQuery a lot, but sometimes I get stuck because my browser cannot see the jQuery library, or maybe loads the library after running the my JavaScript code.
Pseudo-code to explain my question:
<html>
<head>
I always load CSS here
I always load jquery here
</head>
<body>
<p class="link-style3"><span id="my_tag"><span>Bize Hemen Yazın</span></span></p>
<script>
$(function() {
$('#my_tag').click(function(e) {
alert('tesrt');
});
});
</script>
</body>
</html>
I always put my stuff in the order like below, but this doesn't work now. When I click the <span id="my_tag">, it doesn't do anything, and doesn't return any error.
what should I do?
Here is the entire code jsfiddle
Try to avoid some syntax errors like(suggestable only)
<script type="text/javascript">
$(function() {
$('#my_tag').click(function() {
alert('tesrt');
});
})
</script>
and put your code at the top after you load the js files
A few things you can do:
inspect your document (network pane in devtools) to see if everything
is loading correctly
Move your scripts to the bottom of the page
use $(document).ready(function(){ ... });

Local jQuery.js file not working

I had downloaded jQuery.js file from jQuery.com .I have saved this file in 3 places, including JRE/Lib and desktop (where my HTML file which calls it is), to be sure that the jQuery.js file is found. I reference this js file as :
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(function(){
$("#clas").click(function(){
$(this).hide();
});
});
</script>
</head>
<body>
<p id="clas"> Hello</p>
<p>Hi</p>
</body>
When I ran this HTML file on Mozilla browser, I expected 'Hello' to vanish when I clicked on it, but it did not. It remained as solid as ever.
But when I used a jQuery CDN:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js">
And when I used an online HTML editor called Tryit Editor v1.5, it worked correctly!
It seems only the local jQuery.js is not doing its part. The JavaScript works fine, only the $() part doesn't. I'm using jdk1.6. I wonder why this snag has occurred. How to resolve it? Help.
Thanks! I found the solution to this problem, from a similar question posted in this forum, asked a year ago. Here is the link:
jQuery code doesn't work if I'm using a local jquery.js file, why?
The problem seems to have been incompatible encoding of the html and the js files. So I added the charset attribute to script tag of js. And the problem and 'Hello' both vanished at a click!
Your code works for me. Please check the below code, I have just modified the location of the jquery.js file where mine is stored in a different location.
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<%--<script type="text/javascript" src="jquery.js"></script>--%>
<script type="text/javascript" src="../Scripts/jQuery/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(function () {
$("#clas").click(function () {
$(this).hide();
});
});
</script>
</head>
<body>
<p id="clas">Hello</p>
<p>Hi</p>
</body>
</html>
I assume the location of your js is not correct. Are you using the same path of js where you have this "html" or jsp page? Or you have the js files in a separate folder?
Additionally, you can try alternate way as below:
$("#clas").live("click", function () {
$(this).hide();
});
Please let me know if this helps.

Meteor.js: <script> tag doesn't work inside <body>

A simple script tag inside the body tag doesn't seem to work. The alert doesn't get triggered in the code below:
<body>
<script type="text/javascript">
alert('Hello');
</script>
{{>main}}
</body>
Any idea why?
Edit:
Just tried it with a fresh meteor app, no alert tag still:
<head>
<title>test</title>
</head>
<body>
<script type="text/javascript">
alert('Hello');
</script>
{{> hello}}
</body>
<template name="hello">
<h1>Hello World!</h1>
{{greeting}}
<input type="button" value="Click" />
</template>
Weird thing is when I copy paste the source of the html, made a new html page, and the alert will work.
Edit3: I deployed this app here: http://alert-in-body-test.meteor.com/
Do you get an alert box?
This question is still relevant in the current version of Meteor (version 0.5.4) so I wanted to describe how to include script at the end of the body.
To execute javascript at the end of the body, register a Handlebars helper and put the relevant code there, like this:
In client.html:
<body>
{{renderPage}}
{{afterBody}}
</body>
...
In client.js:
if (typeof Handlebars !== 'undefined') {
Handlebars.registerHelper('afterBody', function(name, options) {
$('body').append('AFTER BODY');
});
}
(For a great description of why this is required, see Rahul's answer to a similar question here: https://stackoverflow.com/a/14002991/219238 )
Its working for me
in onrender call this jquery
$.getScript('yours url')
It should work.
I have just pasted this inside one of my projects and it worked.
Your {{>main}} is strange for me tough. Also make sure that <body> is inside <html> tag.
Meteor is constructing the entire DOM from Javascript by rendering your page as a template -- the 'source' for your page as seen by the browser is basically:
<script type="text/javascript" src="/5a8a37bef5095c69bcd3844caf3532e1ba6d49bf.js"></script>
I can't find a definitive page stating that embedding a script tag in a template like this won't cause it to be executed, but it definitely feels against the spirit of what the framework is trying to achieve.
If the point is to achieve a clean separation of your markup and logic then why put it in the template. A better solution would be to use the meteor.startup call
Instead of looking the rendered html at developer tools, try looking the real downloaded html.
You will find a (probably) empty tag, with tons of script tags inside the .
In other words, the body of your meteor application is not the body of the final html, it's just your main template.
Instead, this ton on scripts shipped by Meteor, will load your templates.
So, your code will not run, cause it's been placed there. It's like when you manipulate DOM (with jQuery, for exemple), placing a script tag in DOM, after it's loaded. This script tag will not run.

Categories

Resources