I need the following:
I have an html page, which has declared several javascripts inside the body tag. However, I must make an asynchronous process prior to loading all of these components and render the page, and then continue the process. Any tips on how to solve this?
Thank you.
My code structure:
<html>
<script>
function loadFromServer() {
//this operation is async, and I need to`enter code here` process this before load
//the scripts declareds in body.
}
</script>
<body>
//content
//js loads
</body>
</html>
Have you tried putting the scripts declaration after the body tag?
<body>
...
</body>
<!-- script declarations here -->
<script src=""></script>
<script src=""></script>
<script src=""></script>
Related
I have two external javascript files within my html page.
I need to make sure that the first file, script1.js, is run before my second script, script2.js.
I have them within the body of my html page; how can I ensure that script2 is not used until the functions in script1 are run?
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<!-- Script 1 -->
<script src="js/script1.js"></script>
<!-- Script 2 -->
<script src="js/script2.js"></script>
</body>
</html>
The browser will execute the scripts in the order it finds them. If you call an external script, it will block the page until the script has been loaded and executed.
So if your code is :
<body>
<!-- Script 1 -->
<script src="js/script1.js"></script>
<!-- Script 2 -->
<script src="js/script2.js"></script>
</body>
Script 1 will be run before Script 2.
<script> tag manage it for you... but read on...
JavaScript is synchronous, that means things it will executed line by line by default...
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<!-- Script 1 -->
<script src="js/script1.js"></script> <!-- first gets executed and get finished -->
<!-- Script 2 -->
<script src="js/script2.js"></script> <!-- then second gets executed and get finished -->
</body>
</html>
But at the same JavaScript could be asynchronous too...
So there is an attribute for <script> tag which make the loading asynchronous... async attribute on script tag...
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<!-- Script 1 -->
<script src="js/script1.js" async></script> <!-- load asynchronously -->
<!-- Script 2 -->
<script src="js/script2.js" async></script> <!-- load asynchronously -->
</body>
</html>
Definition and Usage The async attribute is a boolean attribute.
When present, it specifies that the script will be executed
asynchronously as soon as it is available.
Note: The async attribute is only for external scripts (and should only be used if the src attribute is present).
Note: There are several ways an external script can be executed:
If async is present: The script is executed asynchronously with the
rest of the page (the script will be executed while the page continues
the parsing) If async is not present and defer is present: The script
is executed when the page has finished parsing If neither async or
defer is present: The script is fetched and executed immediately,
before the browser continues parsing the page
You can't check if it was running. You could only watch the loading with jQuery and append the second script whenever it's finisished.
HTML:
<script id="first" src="js/script1.js"></script>
JS:
$("#first").on("load", function() {
$("head").append('<script src="js/script2.js"></script>');
});
Te ensure you load all your scripts in the proper way, you have to use some dependency handling library, like RequireJS, that allow you to execute the code just when your declared dependencies are loaded properly.
If you prefer, you could do it by yourself using something like jQuery.getScript, or do it in all javascript take that as an example.
I understand that you're using javascript, but if you have jQuery, you can use (2) document.ready functions like so, and load those script files. Each document.ready will queue (using deferred) for each one.
$(function() { // same as document.ready
$.getScript('script1.js');
});
$(function() {
$.getScript('script2.js');
});
Taken from:
Multiple $(document).ready functions
How to load a script on $(document).ready()/onDeviceReady() of jquery-mobile/phonegap
function loadJS(file) {
// DOM: Create the script element
var jsElm = document.createElement("script");
// set the type attribute
jsElm.type = "application/javascript";
// make the script element load file
jsElm.src = file;
// finally insert the element to the body element in order to load the script
document.body.appendChild(jsElm);
}
myScript.src = 'http://code.jquery.com/jquery-2.1.4.min.js';
myScript.onload = function() {
loadJS("js/script2.js")
};
Your first script add new function .
function firstScriptFunction(){
//i have done nothing here
}
Your Html page
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<!-- Script 1 -->
<script src="js/script1.js"></script>
<!-- Script to load script 2 -- >
<script type="text/javascript">
function loadSecondScript() {
if (!(typeof firstScriptFunction == 'function')) {
window.setTimeout(loadSecondScript, 3000);
}
else {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'js/script2.js';
document.getElementsByTagName('body')[0].appendChild(script);
}
}
$(document).ready(function(){
loadSecondScript();
});
</script>
</body>
</html>
I'm a beginner of jQuery. I wanne write my jQuery in an external js file instead of in the head of html file, but it failed.
index.html:
<!DOCTYPE html>
<head>
<script src="js/func.js"></script>
</head>
<body>
<p id="response">response is shown here</p>
<button id="bt_testJQ">jq test</button>
</body>
</html>
func.js
document.write("<script src='https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js'></script>")`
`$(document).ready(function () {
$("#bt_testJQ").click(function () {
$("#response").toggle();
})
})
`
This has nothing to do with putting the code in an external file, you'd have the same problem if it was inline.
document.write's output is placed after the <script></script> element and parsed by the HTML parser when the script has finished running. Effectively, you are:
setting up jQuery to load
Trying to use jQuery
actually loading jQuery
You can't use jQuery before you load it.
The simple solution to this is to use two script elements in the HTML and load jQuery first.
<script src='https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js'></script>
<script src="js/func.js"></script><!-- with the document.write line removed -->
just wanna to avoid importing the jquery in every html file.
This is best handled by either:
Using a template system.
Using a build system that combines the contents of all your scripts, including third party libraries, into a single file.
A better way of doing this is have the jquery library called at the head and have your external js script at the last part of the body of your html
html code
<!DOCTYPE html>
<head>
<script src='https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js'></script>
</head>
<body>
<p id="response">response is shown here</p>
<button id="bt_testJQ">jq test</button>
<script src="js/func.js"></script>
</body>
</html>
i would like to add javascript to an html page. I don't want to have those scripts inline on the home page however, I would like them to be in an external javascript file. How do I link to an external javascript file so those scripts are run on the page?
<html>
<head> <title>asc Computer Grass Roots pvt. ltd.</title>
<script src="jquery.js"></script>
<script> my jquesry scrips here
</script>
</head>
<body> somecodes </body>
</html>
Instead of
<script>my jquesry scrips here</script>
put
<script src="myscript.js"></script>
Of course you will have to create a file named 'myscript.js' and type javascript code in it.
For example, let say that you have all your javascript code in a file called 'functions.js', to link that javascript file to your html page just do it the same way you linked you jquery file.
<html>
<head> <title>asc Computer Grass Roots pvt. ltd.</title>
<script src="jquery.js"></script>
<script src="functions.js"></script> <!-- linking your file -->
<script>
/*my jquery scripts here */
</script>
</head>
<body> somecodes </body>
</html>
Keep in mind that if the code in your 'functions.js' file needs jQuery to work correctly you have to add 'jquery.js' before adding your custom file, just as it is in the example.
In the map of your website create a file called script.js
put your jquery script in there
replace:
<script>my jquery scrips here</script>
with:
<script src="script.js"></script>
just like you did with the jquery.js, next time search the web before asking questions on SO.
Example
if you google "link javascript file" the first link is your answer to the question (link above is the website).
I am trying to load php code into div tag to show the results but the below code doesn't work for.
Can anyone please help me...to resolve this
my code is below:
<html>
<head>
<script src="//code.jquery.com/jquery-1.9.1.js"></script>
<script type="text/javascript">
$("document").ready(function()
{
$("#myDiv").load("refreshing.php");
}
</script>
</head>
<body>
<div id='myDiv'> </div>
</body>
</html>
Change script tag to this
<script type="text/javascript">
$(document).ready(function()
{
$("#myDiv").load("refreshing.php");
});
</script>
i.e. you're missing ); at the end
Also, document should not have quotes on it
You cannot load php code .load() because as the web server gets the GET request with .php, the request is passed to PHP interpreter which will execute the PHP script and return the result of the php script instead of code. So what you can do is in your PHP script, do a echo of all the code that you want to display. Or, you can define custom rule in your Apache configuration.
You've forgotten the closing bracket:
$("document").ready(function(){
$("#myDiv").load("refreshing.php");
});
this code is put at the top of my asp.net page:
function Test(HtmlDocument)
{
}
How can I execute this javascript function at the end of my page?
Just invoke the function in <script> tags immediately before the </body> tag.
<html>
<head>
<!-- snip -->
</head>
<body>
<!-- snip -->
<script>
Test(document);
</script>
</body>
</html>
Simply put
<script>Test(document);</script>
In the end of your html
The best way to achieve this is using windows.onload. The event can be used to perform some task as soon as the page finishes loading. Here is an example:
<script type="text/javascript">
function my_code(){
alert(" Alert inside my_code function");
}
window.onload=my_code();
</script>
Or you can put the function at the bottom of the code without the function declaration
<script>
Your javascript code here
</script>
The easy way is to drop a script manager on the page (anywhere within the body of the page) then put something like this on the page ...
<script type="text/javascript">
Sys.Application.add_load(function () {
// do your thing
});
</script>
That executes client side when the document has finished loading.