I have a VF page which gets the folder name from the user and creates a folder in one library. The page has a button & the folders existing the library is shown using a repeater. when the button is clicked, a modal is opened to get the folder name from the user.

     <div class="slds-text-align--center slds-p-top--small">
           <button id="btnNewFolder" class="slds-button slds-button--neutral" >New Folder</button>
        <div class="slds" style="margin-left:40% !important;">
           <div aria-hidden="true" role="dialog" hidden="true" class="slds slds-modal slds-fade-in-open" id="modal-new">
              <div class="slds slds-modal__container">
                 <div class="slds slds-modal__header">
                    <button class="slds-button slds-modal__close slds-button--icon-inverse" title="Close" id="cancel">
                       <svg aria-hidden="true" class="slds-button__icon slds-button__icon--large">
                          <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="{!URLFOR($Resource.SLDS0102,'assets/icons/utility-sprite/svg/symbols.svg#close')}"></use>
                       <span class="slds-assistive-text">Close</span>
                    <h1 class="slds slds-text-heading--medium"> Enter The New Folder Name</h1>
                 <!---------content box---->
                 <div class="slds slds slds-modal__content">
                    <div  class="slds slds slds-form-element__control">
                       <div  class="slds-form">
                          <div class="slds-form-element">
                              <h2 style="text-align:center;font-weight:bold;color:red;display:none" id="Notification"></h2>
                              <div class="slds-m-bottom--xxx-small"></div>
                             <div class="slds-is-required"><label class="slds-form-element__label slds-is-required">Folder Name</label></div>
                             <div class="slds-form-element__control">
                                <apex:inputText value="{!newFolderName}"  styleClass="slds slds-input slds-is-required" id="txtFolderName" style="width:72%" onchange="showCreateBtn();"
                                   onkeyup="this.onchange();" />
                 <div class="slds slds-modal__footer">
                    <button class="slds slds-button slds-button--neutral" id="cancelnew" style="margin-right:5px">Cancel</button> 
                    <apex:commandButton styleClass="slds-button slds-button--brand btnCreate"  action="{!CreateNewFolder}"  value="Save" id="btnCreate" style="display:none" onclick="return ValidateFolderName();"/>                        
           <div class="slds slds-modal-backdrop " id="backdrop"></div>
        <!-----------------------------Modal for New End--------------------------->
        <apex:outputPanel id="FolderList">
           <apex:repeat value="{!AssetFolderList}" var="i">

The below code successfully creates folder as expected. the problem is when I try to rerender the list of folders when the commandbutton btnCreate is clicked. Nothing happens when this button clicked if I add the rerender="FolderList" attribute. The modal popup does not close, the page is not rerendered. If delete just this attribute things starts to work, but the page is getting submitted which I dont want. Please suggest what I am missing


Your close button should call an ActionFunction which will allow you to target VF that can be re-rendered.

<apex:actionFunction name="RerenderList" action="{!RerenderList}" rerender="FolderList">

<button onClick="RerenderList();">Close</button>

<apex:outputpanel id="FolderList">
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