Develop Reference

How should I not load the images with broken link?

I'm working on a feature, in which images are being rendered from the servers. I was working on aligning the images but found that there is a lot of white space. This was the reason, due to loading of images with a broken link.
HTML :
<div class="image-result" *ngIf="Display('images')">
<div class="col-sm-3" *ngFor="let item of items$|async">
<a href="{{item.link}}">
<figure>
<img class="res-img" src="{{item.link}}" onerror="this.style.display='none'">
</figure>
</a>
</div>
</div>
I have used onerror="this.style.display='none'" to solve the problem, but leaves a lot of white space when images are being loaded from the server. Is there any solution for it like to remove img tag whenever a image with a broken link has been detected ? I have gone through stackoverflow before asking question, but I'm not able to solve this problem. It would be great if someone can help me out. Thanks! :)

Instead of onerror="this.style.display='none'" to hide an image, you can use onerror="this.parentNode.removeChild(this)" to remove the image tag altogether.
If you want to remove the entire column, in your specific case you can do the following.
var colEl = this.parentNode.parentNode.parentNode;
colEl.parentNode.removeChild(colEl);
Or, in your HTML:
onerror="this.parentNode.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode.parentNode)"
You should probably move that to some JavaScript function and attach your handler by saying
element.addEventListener('error', function() { /* ... */ });
References: parentNode, removeChild, addEventListener.
If you don't care about supporting Internet Explorer, you can also use remove instead of doing the parentNode.removeChild trickery. That would be particularly useful for reducing the code length in your onerror attribute, would you choose to use it, but I don't recommend that.

A more angular-way of doing this would be:
<img src="{{item.link}}" (error)="item.brokenImage=true">
So you would have:
<div class="col-sm-3" *ngFor="let item of items$|async">
<div *ngIf="!item.brokenImage">
<a href="{{item.link}}">
<figure>
<img class="res-img" [src]="item.link" (error)="item.brokenImage=true">
</figure>
</a>
</div>
</div>
You need to listen for the error event of the image element, and assign a boolean on whether the image loaded successfully or not. Then, depending on that value angular will either show the image with the div, or remove it from the DOM.

Fading Images with links

I have this code for the header
<div id="header">
<IMG SRC="http://danithemes.fanscity.eu/shugar/wp-content/uploads/2014/11/header-principal.png">
</div>
And this code for the main menu
<div id="menu">
Link One,
Link Two,
Link Three
</div>
I want the header image to fade into another image through the main menu links. Is this possible? Thanks.

First of all most W3C folks will get mad at you for this line <div id="header">
Anything syntactically named with an id the same as a generic HTML object tag needs to just be that tag. Anything good enough to give an id of id='header' should probably just be a <header> tag.
Secondly, I am unsure what the question is asking fully so let's go with something not yet said. #Parody showed a fiddled way of having the images change on click. The part of your question that said I want the header image to fade into another image through the main menu links. Is this possible? is difficult to understand so I am going to assume that you want some kind of event to trigger the changing of the images? There are many ways to do this but the best of which (especially for beginning programmers) is to use Bootstrap version 3.0+ since it comes with HTML driven stuff that usually requires JavaScript/JQuery to accomplish.
If you don't want to use Bootstrap then that's fine here is an example of how to use a hover event to trigger the change using JQuery...
HTML
<div id="header">
<img src="http://danithemes.fanscity.eu/shugar/wp-content/uploads/2014/11/header-principal.png" />
</div>
<div id="menu">
Link One
Link Two
Link Three
</div>
JAVASCRIPT/JQUERY
$(".navLink").each(function() {
$(this).hover(function() {
$("#header img").css({"background-image":"url($(this).attr('data-image'))"});
});
});

bootstrap popover content setting

bootstrap popover currrently expects this:
hover for popover
$("#example").popover({placement:'bottom'});
..expects you to define data-content in template or dynamically pass it in jquery.
Is there anyway it can support format like below:
..the point being able to define content/title in blocks
<div id="example">
<div class="original-title">
Twitter Bootstrap Popover
</div>
<div class="data-content">
It's so simple to create a tooltop for my website!
</div>
<a>hover for popover</a>
<div>
$("#example").popover({placement:'bottom'})

Currently, no, since the popover script is basically extending the functionally of the tooltip script, but nothing is impossible. You can modify the script and add custom data-attributes to support your markup yourself, but then when updates come around you will have to do it again if you want to support your edits, or not update at all.

I think that can be possible using a javascript code to give the content of this divs to the elements but is not recommended.
$("a").attr("data-title",$(".data-title").html()).attr(".data-content",$(".data-content").html());
$('a').popover({placement:'bottom'})

Javascript show/hide: How to set to Show

I have the following code:
<a class="button" href="javascript:ShowHide('elaborate_1')" style="font-size:24px; padding:0 10px; margin-left:10px;">COLLAPSE</a>
<div id="elaborate_1" class="expandable-box" style="display:none;">
<div class="description"><?php //USE THIS CLASS 'description' ON A 'div' TAG FOR A GRAY BOX TO DISPLAY CONTENT ?>
<p class="nomargin nopadding">HELLO</p>
</div><!-- .descpription -->
</div>
The web page currently hides this message "hello" until I click "COLLAPSE" however I want the content to be shown automatically until I click "collapse.
How can I do this?

Change the display:none to display:block on your elaborate_1 div.

Remove the display:none from the containing element:
<div id="elaborate_1" class="expandable-box">
If your ShowHide function is correct, it should work just like that. If not, you should post the code from the function.

Just remove style="display:none;" from your html element
and add following code to your js function (for reference)
document.getElementById("elaborate_1").style.display = "block";
Personally I would suggest taking a look at JQuery. It allows you to take advantage of controlling various effects, like show, hide, toggle, fade, and custom animation, etc. Here is the link: http://api.jquery.com/category/effects/ which might be useful to you.
A little Jquery sample code:
$('a.button').click(function(){
$('#elaborate_1').toggle("slow");
});

How to use Jquery to colour the background of an element, based on keywords within the html

I'm trying to use Jquery to firstly identify specific words within a span tag, and then colour the background of a div it is nested in. The HTML looks like this:
<div class="highlight item1 ll3">
<div class="Image">
<h2 class="Name">
<div class="type">
<span>Workshop</span>
</div>
<div class="Dates">
<p class="Desc">Toddlers are especially welcome to BALTIC on Tuesdays. Join
in the fun, as a BALTIC artist leads a practical session using a variety of
materials,...
</p>
So I think I need to use Jquery to identify if equals "Workshop" then color the div with class highlight (for e.g. set background to #000). I need to repeat this so that each div.highlight that has a different value is given a different color.
Thanks so much in advance.
Jason

Something like this should work:
$(document).ready(function(){
$("span:contains('Workshop')").parent().css({ "background-color" : "#f8f8f8" });
});

Check this example if you are looking to add css based on keywords
http://tinkerbin.com/q6GwDrvJ

<script type="text/javascript">
$(document).ready(function(){
$("span:contains(Workshop)").parent().css( "background-color","red" );
});
</script>