HTML5 Projects: Advanced To-Do List
Illustration by John Hersey

Removing list items


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HTML5 Projects: Advanced To-Do List

with Joseph Lowery

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Video: Removing list items

One of my greatest joys in life is marking items off my list. I've even been known to write out a list item even though I've already done it just so I can scratch it out. What can I tell you. In this lesson, we'll add the functionality to remove list items one at a time, as well as wire up our clear all link so we can get rid of them all quickly and easily. Now we have the index dot html file from the chapter 3 03 04 folder open in our code editor, to the bottom of the page we go where our javascript lies and we'll go all the way to the bottom and add in our next set of functions.
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Watch the Online Video Course HTML5 Projects: Advanced To-Do List
45m 50s Intermediate Aug 26, 2013

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The HTML5 Projects series combines HTML5, CSS3, and recent JavaScript API technologies to enhance your web projects with interactivity and multimedia. This installment shows how to create a basic to-do list widget with an editable field so users can enter their tasks and delete them as they are completed, and a more advanced version with all the bells and whistles, including a drag-and-drop interface that allows for quick and easy sorting. Author Joseph Lowery covers HTML5 technologies such as web databases, content editing in the browser, and CSS transitions and transforms.

Topics include:
  • Making content editable
  • Saving edits
  • Setting up the core files for your app
  • Removing list items
  • Enabling drag-and-drop sorting
Subjects:
Design Web
Software:
HTML JavaScript CSS
Author:
Joseph Lowery

Removing list items

One of my greatest joys in life is marking items off my list. I've even been known to write out a list item even though I've already done it just so I can scratch it out. What can I tell you. In this lesson, we'll add the functionality to remove list items one at a time, as well as wire up our clear all link so we can get rid of them all quickly and easily. Now we have the index dot html file from the chapter 3 03 04 folder open in our code editor, to the bottom of the page we go where our javascript lies and we'll go all the way to the bottom and add in our next set of functions.

So I need three functions to remove list items properly, one to show the red x when a user mouses over the list item, another to hide that red x when he or she mouses out, and then a third to delete the list item when the x is clicked. All three use the J query on function to detect event triggering so we're going to put the first of these after our sortable update code block. Now, the red x is hidden by default by CSS so let's add code first to show it on mouse over.

I'll put in my JQuery dollar sign for the selector, a pair of parantheses and a pair of single quotes. And we start by targeting the list, that's the UL tag .on and then parantheses in single quotes mouse over. Follow that with a comma and then we put in the item within the list that we are actually targeting which is LI, follow that with a another comma and then open up a function with own set of parenthesis and then a curly braise and I'll make a little room and put in my semicolon.

So the first thing we need to do once this event is triggered, is to find the Anchor Tag. That's the A tag. Within this particular list item. So I'm going to set up a Variable, call it thisA, and set that equal to Dollar Sign, Parentheses, this. That's going to refer to the particular list item that was mouse overed, .find. And what are we looking for? It's the a tag in single quotes. Put a semicolon at the end of that. And now, once we have that, we can target the variable, this a. We'll change the display property, which I'll put in single quotes.

And follow that by what ever it is that we're going to change it to and we're going to change it to block ; at the end and this little code block's done. Now the next code block where I hide the x on mouse out is pretty similar so let's just copy and paste the one we just did and make some changes. So I'll select it starting on line 204 go all the way down I'll do that paste it in and then we'll change mouse over to mouse out and change display block to display none okay now we're ready to actually remove the list item.

And this will happen if the user clicks the X link. So again, we'll use the on event to trigger it, but we'll look for a click. So, start off by targeting the outer list. Follow that with .on, and then open and close parentheses. Our event is click, comma, what we're actually targeting has a class name of removeListItem. That's the anchor tag, and then we'll put in our function with an e for error handling, and our {}, and let's not forget our closing ; there.

Now because we are clicking on a link, we don't want it to go to that link, so we'll use the e.preventDefault to prevent the default behavior. And then we just need one line of code to remove the item. So we want to again use the jQuery this operator. Now the this in this case that it's referring to is the anchor tag, and we don't want to remove just the anchor tag. We want to remove what's surround the anchor tag, its parent, in other words. So I'll put in parent and ( ), and then function remove.

Close that off with a semicolon, and we're done! Okay, our individual list items are handled. Now, let's bring our Clear All link online. Again, we'll use the ON function and prevent the normal default action of clicking a link. So, let's start there, but this time we're going to be targeting the ID doClearAll, This is the ID that's assigned to a paragraph tag that's holding the Clear All link. And we'll do .on ( ). The event is click. What we're targeting is the link that has an ID of clearAll, and put in a function for it.

We'll use our e for error handling. { }. Close it off with a ;. And as I said we want to prevent that normal default action from occurring so E dot prevent default, now comes the code to remove all the children of the list which is all the list items and that's easy its just one line of code but we'll target the list. More specifically the children of the list and what do we want to do, remove it, not to difficult right. Finally time for a little more cleanup first because we've gotten rid of all the list items we're going to reset the new list flag to true.

Then we're going to clear out the input field just in case there's anything left in there. The ID for that element is toDoItem, and we'll just set its value, its val, to nothing. Now because we have no list items, we don't want our clearAll showing, so we're going to hide the clearAll link. You'll recall that the id for the paragraph holding that is the one that's at the top of this code block and that's do clear all. And we'll set the css property of display to none. Now finally we're going to reset the focus to our input field.

And you can do that after identifying it by just putting in .focus(). I'll save my page, and now we're actually ready to tackle the final task, saving and restoring our list automatically.

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