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Now we're going to add an optional fade in effect for your tooltip. So let's come back to our tooltip.js file. Let's scroll up and find the mouseover function. In the mouseover function we take the tooltip container and we assign the display of block. What we're going to do here is add a second property. So inside of the css parentheses, let's add brackets outside of the display block, and let's change the comma to a colon.
This syntax is going to allow us to assign multiple CSS properties. So display block is going to be the first property, then a comma, two tick marks, opacity:0. So now we're assigning display of block and opacity of 0. Then outside of the parentheses for CSS we're going to type .animate. Another set of parentheses, leave the semicolon on the end, inside of animate another set of brackets, inside of the brackets we're going to opacity:1. Then a comma outside of the brackets, but still inside of the parentheses for animate 250 for 250 milliseconds.
So what this is doing is we're setting two CSS properties display and opacity, and the opacity is set to 0 and then we're going to animate the opacity up to 1, which is 100%, over the course of one quarter of a second. So that's going to give us our fade in effect. Let's scroll down in our script. Let's find the mouseout. Let's hit a few Returns inside up here. So what we're going to do inside of here is first fade out the tip. Now we can't set the display to none before we do the animation or the tooltip will just pop off the screen immediately.
So let's start with $('# tooltip_container').animate();. Inside of the parentheses are brackets, we'll set opacity:0. Outside of the brackets, but still inside of the parentheses, comma, 250, and then we're going to add something called a callback function.
This is going to be an instruction that will happen after the animation has completed. So we'll type a comma, function, parentheses, brackets, and let's split it open on the brackets. So now let's come down here and copy the css display none. Let's cut that to the clipboard, let's come up here, and paste that into place. Now the last little piece we're going to do is we're going to also set the HTML inside of that tooltip container to be null.
So after the parentheses for CSS, let's type .html, another set of parentheses, inside we're going to add two tick marks for string literal, then hit Save. So what this is going to do is after we roll out of a tooltip we're going to animate the opacity down to 0, over 250 milliseconds or quarter of a second. Then once that's complete we're going to run the function inside of there which is going to set the css display type to none, so that that item will take up no space on the page and we're going to set the html back to null.
Let's choose File > Save. Let's come back to our index.html. File > Save All and then Preview in Browser. Let's reload the page. Let's rollover the tooltip. You'll see the tooltip fade in. When I move away it will fade out. Now at this point we've completed adding a tooltip into a web page. In some instances you might notice that the tooltip container doesn't actually track with the mouse properly. Sometimes there can be some CSS properties that will get in the way. So in the next movie we will look how you might want to correct for positioning problems.
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