Skip to main content

Bootstrap modal dialog issue: Dropdown always closes

Last week, a developer reported a strange issue: he was using the Bootstrap modal dialog. On this dialog he added a dropdown control(a  KendoUI control in this case). The problem was that each time he opened up the dropdownlist to  select an item, it immediatelly closed again.

When we investigated the issue, we noticed that the moment the dropdown list opened, the Bootstrap modal dialog steals the focus and a blur event is triggered. This blur event makes the control close again.

After further investigation we discovered what was causing this behavior. The dropdownlist creates a hidden popup element on the page. This popup element is not part of the modal dialog content. This means that when you click on the popup element, the modal dialog thinks that you want to move out of the dialog and therefore triggers a blur event.

I noticed the same behavior not only with the KendoUI DropDownList control but also with other dropdown controls like  Select2.

We found 2 possible solutions that solve the issue(both of them work)

  • Solution 1 – Remove the tabindex=-1 from the modal dialog:

<div class="modal fade" tabindex="-1" role="dialog">
     <div class="modal-dialog"> <!-content removed—></div>
</div>

  • Solution 2 – (In case of Kendo UI) Use the .appendTo method on the DropDownList control to add the popup to the content of the modal dialog:

.Popup(p => p.AppendTo("[selector]"))

Labels:

Popular posts from this blog

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t
Read more

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Color B
Read more