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Now that we have a click event assigned to all of the spans inside of the tabs container that call a function called changePanels, let's come up here and copy this function name. Let's come down on our script. Make sure we're outside of the document ready for jQuery. Let's type function, space. Let's paste in that function name, beginning and ending parentheses, beginning and ending bracket. Let's split that open on the brackets. Now when we call this changePanels function we're also sending a parameter.
Inside of here we're sending this.index, so this is going to be passed here into our variable that we're going to define inside of the parentheses. Let's just call this newIndex. So now inside of this function, let's hit few returns. We want to first declare a variable. We are going to type var. We are going to set newPanelPosition. We're going to set this equal to--let's type parentheses. Inside we're going to type window.panelWidth, asterisk. We're going to multiply this times the newIndex. Then outside of the parentheses we're going to multiply that value by -1, then a semicolon.
This is going to give us the panelWidth that we want to move to the panels_container, and we're setting a negative number so that it moves towards the left. Next, let's declare another variable, newPanelHeight. We're going to set that equal to dollar sign, beginning and ending parentheses, semicolon, and inside of the parentheses we want to target the panel that's being activated so we know how high to animate the height container so we can have varying heights on our panels. So inside of the parentheses two tick marks for string literal, .sp .panel, then I'll type colon, nth or nth-child, beginning and ending parentheses. And inside of the parentheses what we're going to do is concatenate the actual index of the child we're looking for.
So inside of here we're going to type two tick marks for a string literal, then two plus signs inside of here, then inside of the plus signs, two parentheses, then inside of the parentheses, we're going to take newIndex and we're going to add 1 to it. Now we're adding 1 here because jQuery's nth child starts with 1, but the index that's coming down as the new variable when we call this function is going to start from zero. So we want to make sure that we take that variable and add 1 to it so that the nth-child matches the index number +1.
Now once we find the activated panel--let's bring our cursor outside of these parentheses here-- we're going to type .find, beginning and ending parenthesis, and we're going to search for the panel content of the activated panel. So inside of find, we're going to type two tick marks for string literal, .panel_content, then outside of those parentheses .height, beginning and ending parentheses. So now the newPanelHeight variable knows how tall the outermost container needs to be to encompass all of the content that we put into the panel.
Now with these two variables declared, we can create our animation. So let's add a few more lines, dollar sign, beginning and ending parentheses, tick marks for a string literal, .sp .panels. Outside of the parentheses .animates, another set of parentheses, semicolon, inside of the parentheses beginning and ending bracket. Inside of the brackets we'll type left, colon.
Let's come up here and copy the newPanelPosition variable name. Then outside of the brackets comma, put 1000 milliseconds. That's the amount of time it's going to take to animate to the new position. Next we'll animate the height, so dollar sign, beginning and ending parenthesis, tick marks inside for a string literal, .sp .panel_ container, outside of the parentheses .animate, beginning and ending parentheses, semicolon, inside of the parentheses, beginning and ending bracket, inside of the brackets height:. Let's come up here and copy the variable name newPanelHeight.
Paste that after the colon, outside of the brackets, comma, 1000 milliseconds. And to preview this, let's come back to index.html, choose File > Save All. Let's come into Live view or preview in your browser. And we won't see anything until we actually click on one of the tabs, so I'll click on Video. That will animate the panel open. I'm going to scroll up here a little bit. And now I can click between the individual tabs and we'll see that the content not only changes height but actually swipes back and forth.
Now, one thing you'll notice notice is that the height of the container is going right to the very bottom of the content. Now, we did set padding on the content containers but the overall panel container doesn't account for that since the items inside are absolute positioned. So to correct for this, let's come out of Live view or out of your browser. Let's come back to the sliding panels and up here where we declared the newPanelHeight, after height, let's come in here. Let's add a plus and then add 15. That's the amount of space we want to have at the bottom.
Now let's save our file. Let's come back and preview it again, and then when we open up our individual panels we'll now add an extra 15 pixels across the bottom. So again, that space is not being defined in the padding. We're actually opening that container up an extra 15 pixels based on the height of the content. Now that our panels slide back and forth and are height animates to the content inside, next we'll work on activating the tab's selected state.
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