output with javascript/jquery - javascript

I have a script that runs within the body. How can I make it output directly after itself. Similar to echo in php.
e.g.
<div id="text">Text</div>
<div id="someotherdiv">
The text above says
<script>
$('#text').html().echo?;
</script>
</div>

You're looking for document.write, like this:
document.write($('#text').html());
EDIT: document.write will only work while the page is loading (as opposed to in an event handler or timer).
To append content later, use jQuery:
$('#someotherdiv').append($('#text').html());

Related

Using .load in JavaScript

I am using .load() function in JavaScript and I'm working with JSP java files. I am loading a page like this in JavaScript
$("#body").load("livestatus #status")
The problem is the div I'm trying to load doesn't load immediately on page load because it contains some data from APIs, so there's a one second delay but my code doesn't accommodate that delay.
Try to put your code in document.ready block or if you are making an ajax request then put your code in Ajax success function
If you use jQuery and it just not initialized for some element, you can use
$(function() {
$("#body"). // ... your code
});
If it calls through some time and you can't track when exactly, you can use live listeners on some event. Like, click on this element.
$("body").on("click", "#body", function() {
// your code
});
$("body") can contain any parent element which had loaded before jQuery.
Or you can load 1px image with you code which loads after main code and track when it will load.
<div id="body">
<!-- your markup -->
<img class="loading-status-img" src="../path_to_1px_small_image.png" style="display:none">
<img class="loading-status-img-2" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVQI12NgYAAAAAMAASDVlMcAAAAASUVORK5CYII=" style="display:none">
<!-- your markup -->
</div>
<script>
$("body").on("load", ".loading-status-img", function() {
// execute you code here after #body will load
});
</script>
The second image is encoded with base64.
[UPD] old version of jQuery have another syntax. More: http://api.jquery.com/live/

Creating a dynamic variable in jQuery or PHP

I know there are already a few questions like mine but I wasn't able to fix my problem with their solutions.
I got this code in an external html file to include it in others files:
<div class="header">
<h1 class="replace-me">I'am a placeholder</h1>
</div>
The "file" above gets included into this "file":
<h2 style="display: none" class="variable">Hey, I'm a variable</h2>
The Variable from the second code should replace the content of the h1 tag in the first code. I know this isn't a forum to get free codes, I just want some inspirations or suggestions. Thanks Guys!
You can replace the html of one element with the html of another element, like so:
$(".replace-me").html($(".variable").html());
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="header">
<h1 class="replace-me">I'am a placeholder</h1>
</div>
<h2 style="display: none" class="variable">Hey, I'm a variable</h2>
However, as Rama Schneider pointed out, you might want to get your content in a different way than html.
Also note that this jQuery-solution is done client-side. If you already know the content when serving the initial HTML, you want to do this server-side.
If you have control over the external file, I'd suggest rewriting things so the external file serves a json object of some sort and work with your data from there.
Otherwise it's a simple matter of using JQuery to get the html contents from the variable and use that value to replace the html contents of the 'replace-me'.
You should solve this on server-side if you can. Make the common template a function, like this:
function getHeader($content) { ?>
<div class="header">
<h1 class="replace-me"><?php echo $content; ?></h1>
</div> <?php
}
calculate $content before you call the function and pass it to the function. If you cannot make this a function and you get this as it is from a third-party source, then you can do it via Javascript, like this:
<script type="text/javascript">
document.getElementsByClassName("header")[0].getElementsByClassName("replace-me")[0].innerHTML = "<?php echo $content; ?>";
</script>
Make sure you add this script after the header tag was loaded.

When is a DOM element "ready"?

This might sound like a silly question, and I tend to use:
$(document).ready(function() { });
But basic question.
Let's say I have a list of elements like this:
<body>
<p>Paragraph</p>
<div>Div</div>
<div id="HelloWorld">Hello, World</div>
<script>
var hw = $('#HelloWorld');
$(document).ready(function() {
// hw is available for me here
});
</script>
<p>Another paragraph</p>
</body>
It seems the div is available, and I don't run into errors, but is there anything technically wrong with this? Not talking perfectly organized code, but just curious about the technical question at hand.
So I suppose the question is:
Is a DOM element considered complete and available as soon as the browser reads it, regardless if the rest of the elements have loaded yet?
It seems the div is available, and I don't run into errors, but is there anything technically wrong with this?
No. As long as the script isn't run until after the element exists, you can access it. A script in a script tag that's after the markup for the element it refers to will consistently, cross-browser, be able to access that element.
Always works:
<div id="foo">...</div>
<script>
$("#foo")...
</script>
Never works:
<script>
$("#foo")...
</script>
<div id="foo">...</div>
Works only because jQuery delays executing the ready callback:
<script>
$(document).ready(function() {
$("#foo")...
});
</script>
<div id="foo">...</div>
This is one of the reasons for the common recommendation to put script tags at the end of the document, just before the closing </body> tag. That way, they have access to all of the elements defined above them. (And they don't delay the initial presentation of the page, which is usually, though not always, what you want...)

Load HTML within AJAX call

I'm having some difficulty with a Javascript function I am writing. The basic function of the script is that when a specific AJAX function is called and returns successful, it loads some HTML from a file and inserts that HTML into a on the main page and then (once loaded), fades in the parent div.
jQuery.ajax({
type: "POST",
url: "fns/authenticate.php",
data: dataString,
success: function (data) {
if (data=='1') {
jQuery("#authlogin").fadeOut(500, function(){
$(this).remove();
jQuery("#result").load("fns/logic.html", function() {
jQuery('#authtrue').fadeIn(1000);
});
});
} else {
jQuery('#details-error').fadeIn(200);
}
}
});
return false;
Now the AJAX seems to function properly, in that it will execute under the correct conditions and fade out and in the correct divs, the problem seems to be that the content isn't being loaded from logic.html or it is not being bound to the #result div correctly.
The main page's html looks like:
<div id="authlogin">
<!-- HTML form -->
</div>
<div id="authtrue" style="display: none;">
<div id="result"></div>
</div>
Any help would be much appreciated.
This is one of those things that you must troubleshoot yourself, because we do not have access to your fns/logic.html and therefore cannot test fully.
However, some thoughts:
(1) The basic logic of your .load() success function seems correct. Here is a jsFiddle that approximates the AJAX success function's logic. I substituted .html() for .load() because jsFiddle cannot do ajax. Anyway, assuming that .load() is doing what it should, that part should be working.
(2) You may already know this, but note that .load() is shorthand for $.ajax() -- as are .post() and .get(). You might find $.ajax() easier to troubleshoot as the code block is more structured. As a general rule, troubleshooting the shorthand constructions is slightly more abstract/difficult than troubleshooting $.ajax()
(3) Use developer tools in Chrome (press F12 key) to verify that the contents of logic.html have been inserted into the #result div. You might find, as I did in playing with my jsFiddle, that the contents were injected but the #authtrue div remained hidden. At least you will know that the logic.html document has been found and contents inserted. Knowing exactly where the problem is, finding/fixing the rest might now be trivial.
(4) Does your logic.html file include unnecessary header information? If so, you can strip it out by only inserting the BODY of the document, or a top-level containing div. See this section of the jQuery docs:
jQuery("#result").load("fns/logic.html #container", function() {//CALLBACK IN HERE});
(5) It would be a smart idea to create a test document that just and only loads the logic.html document, using various methods:
Method A: Using PHP (or whatever server-side language you use)
<div id="authlogin">
<!-- HTML form -->
<input type="button" id="mybutt" value="Click Me to Start" />
</div>
<div id="authtrue" style="display:none;">
<div id="result"><?php include 'logic.html'; ?></div>
</div>
Method B: Using load()
HTML:
<div id="authlogin">
<!-- HTML form -->
<input type="button" id="mybutt" value="Click Me to Start" />
</div>
<div id="authtrue" style="display:none;">
<div id="result"></div>
</div>
jQuery:
jQuery('#authtrue').show();
jQuery("#result").load("fns/logic.html");
(6) Ensure you do not have a typo in the destination element jquery selector: If no element is matched by the selector — in this case, if the document does not contain an element with id="result" — the Ajax request will not be sent. (from the docs)
I managed to fix this myself, thanks to the help of everyone here. It ended up being a browser caching problem. As soon as I cleared the cache everything magically worked.

Dynamically generated script not working

I have a contenteditable div where you type javascript which gets outputted into an empty script tag.
<div contenteditable="true" id="script-generator"></div>
<div id="save-script">Save</div>
<script type="text/shorthand" id="script">
</script>
So you write your script in the div, click save and I have some JS which gets the html of the contenteditable div and adds it to an empty script tag.
$('#save-script').click(function() {
var script = $('#script-generator').html();
$('#script').html(script);
});
So far this works. But the generated script has no effect. The browser must not recognise the script because it wasn't there on page load? How do I make the script take effect without reloading the page?
Note: The type/shortand on the script is because I'm using a plugin which converts shortand words into actual Javascript. So the user would just need to write shorthand into the contenteditable div, and the plugin would convert that to JS. This might be adding to the problem?
I don't think it works to modify an existing <script> element. If you want the script to be executed you need to add a new element.
$('#save-script').click(function() {
var script = $('#script-generator').html();
$("#script").text(script);
ShortHand.parseScripts();
});
Correct - you need to create the script tag to have it execute after load.
$('head').append($('<script />', {html: script}));
...which means you can remove your empty script tag.
I have set up a test that's similar to what you have been looking for. Take a look and see if that helps.
Working Demo
Test code:
<div id="script" style="display:none">
alert(4+4);
</div>
<input id="sLoad" type="button" value="Load/Execute Script" />
$('#sLoad').click(function(){
//You may want to append to the head
$('<script/>').append( $('#script').html() ).appendTo('#script');
});

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