Following a partial postback of the Update-panel, anything that is not within the panel seems to vanish

Query Description:

I am facing an issue with an AJAX file-uploader control inside an update panel. Once a file is successfully uploaded, I want to display a Bootstrap popup to the user.

Situation 1: When I include the update-panel property "updateMode='conditional'", the popup appears correctly after the file upload. However, the control located outside of the update panel does not render after a partial postback. I am using the following code snippet to trigger the JavaScript code from the code behind:

ScriptManager.RegisterStartupScript(this, this.GetType(), "AddStudent",
    "addStudent('1','xyz','10000');",true);

Situation 2: If I remove the "updateMode='conditional'" property, the controls outside the update panel remain visible after a partial postback, but the popup does not work at all - meaning the script is not registered in the DOM.

Appreciate any assistance.

javascriptasp.netpopupupdatepanelscriptmanager

Answer №1

After meticulously examining every line of code, I finally uncovered the root cause of the bug.

A "div" tag that was nested inside an update-panel was left unclosed, causing unexpected behavior. Here is the issue and the resolution:

Erroneous tag: 

<div class="vertical-bar"/>

Solution:

<div class="vertical-bar"></div>

Due to the incorrect closure of the above DIV, the DOM mistakenly interpreted that all elements below the div were within it, leading to all controls being rendered inside the update-panel.

As a result, during partial-postback, the other controls were disappearing.

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