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JavaScript jQuery Basics Understanding jQuery Events and DOM Traversal Spoiler Revealer: Breaking it Down

David Lacho
David Lacho
20,864 Points

Split second where spoiler is shown before app.js loaded

Running the preview. When the page loads, there's a split second before app.js is loaded, and so there's a second .hidden() is called on .spoiler span. Therefore, when the page is loaded, you can see the spoiler... Is there a way around this?

One simply solution is to toggle the hidden attribute on the <span> tag in the html.

For example:

<span hidden>Severus Snape is a good guy!!</span>

That way as the page is loading you will see that for that split second just the styling of the spoiler will be shown (the blue background) but not the spoiler itself. Hope that helps.

3 Answers

Steven Parker
Steven Parker
231,248 Points

You can hide the elements using CSS, which will take effect before the page is loaded.

.spoiler span { display: none; }

After adding this CSS, you can remove the script lines that hide the element initially.

Alan McClenaghan
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Alan McClenaghan
Full Stack JavaScript Techdegree Graduate 56,501 Points

This works but then the padding no longer has any effect when the spoiler is revealed. Rather than use the .show() method, you should instead use .css('display', 'block');

Steven Parker
Steven Parker
231,248 Points

Note that I was suggesting you should add this to the CSS, not replace anything already there! No changes to the JavaScript will be needed, but you can optionally remove the code with "hide".

Alan McClenaghan
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Alan McClenaghan
Full Stack JavaScript Techdegree Graduate 56,501 Points

The CSS is .spoiler span { color: #dae1e4; display: block; padding: 40px 20px; } Surely adding display: none; overwrites the display: block; and stops the padding taking effect. Please explain if I am wrong.

Steven Parker
Steven Parker
231,248 Points

I didn't realize the span was in block mode to begin with, so that makes sense. But you could use a div instead of a span which would be block mode by default and then you could still use "show".

Alan McClenaghan
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Alan McClenaghan
Full Stack JavaScript Techdegree Graduate 56,501 Points

In the CSS file, change .spoiler span to { display: none; }. This will prevent the spoiler being revealed but will mean the span element has no padding applied. Then in the JavaScript, rather than use the .show() method, you should instead use .css('display', 'block') to change the css property value back to block.

It still isn't working even when I made those changes. There's a split second when the page loads where the spoiler shows before it is hidden.

Evgeny Kasian
Evgeny Kasian
5,491 Points

Also make sure to put all of the functionality wrapped in $(function(){

//code here })

So that jQuery fires only ones DOM is finished being constructed.

Steven Parker
Steven Parker
231,248 Points

That's not really a concern when the script loading is done at the end of the document.