The jQuery UI Datepicker can sometimes be a bit finicky when it comes to its z-index and dialog placement. This issue can arise when the datepicker is overlapped by other elements on the page.
One of the main reasons for this issue is due to the datepicker's default z-index value, which is 1000. As mentioned in the section on "jquery ui datepicker z-index", this value can sometimes be too low for certain elements, causing them to overlap the datepicker.
To overcome this issue, you can try increasing the z-index value of the datepicker. For example, setting it to 2000 or higher can help ensure that the datepicker is displayed on top of other elements.
If this caught your attention, see: Tailwind Css Z-index
Changing the Datepicker
You can use JavaScript to change the z-index of the datepicker when it launches, but it seems the z-index gets overwritten each time the datepicker is launched.
The dirty way to do this is to write a style in one of your stylesheets, but it's better to use JavaScript.
You can set the z-index manually on your datepicker class, like this: z-index: 100999.
In fact, setting the z-index on the base/ui.datepicker.css class works well.
This approach is especially useful when you're using a custom made "ios style on/off toggle" that's showing up on top of your datepicker.
Additional reading: Tailwindcss Date Picker
Using the Datepicker in a Dialog
Setting the z-index manually is a viable solution to ensure the datepicker appears on top of other elements in a dialog.
Using Firebug can help you figure out the correct z-index value, as demonstrated in the example where the z-index was set to 100999 on the .ui-datepicker class.
To set the z-index manually, you can modify the CSS class associated with the datepicker, such as the base/ui.datepicker.css class, as shown in the example where the width, padding, and z-index were adjusted.
The .ui-datepicker class was modified to include a z-index of 100999, which resolved the issue of the datepicker being hidden behind other elements in the dialog.
Curious to learn more? Check out: Jquery Apply Css Class
Z-Index and Dialogs
Setting the z-index manually is a common solution to issues like this. You can do this by modifying the CSS class of your datepicker, just like the example shows.
The z-index property is what determines the stacking order of elements on a webpage. In the case of the datepicker, setting it to a high value like 100999 ensures it appears on top.
Recommended read: React Js Bootstrap Datepicker
New users to jQuery may not be familiar with CSS, but it's often necessary to solve these kinds of problems. Firebug can be a helpful tool for figuring out how to set the z-index.
You shouldn't change the z-index of a dialog when it's already at the top of the page. This is a known issue that's been fixed in some versions of jQuery UI.
The fixes for issues #6267 and #8729 removed the zIndex option from the dialog, which is a good thing. It means you don't have to worry about setting the z-index manually in these cases.
Recommended read: Ui Jquery Dialog
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