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I want to validate custom modal dialog form and if its not ok, prevent form from closing. For this purpose, I attached to X-close-dialog-button. Problem is to prevent it's default behavior. 

function fValidateBeforeClose(event) {
    event.stopImmediatePropagation(); // Not working
}    
function fAddOnCloseHandler() {
    var oCloseButton = jQuery("a[id^='DlgClose']", parent.document);
    oCloseButton.on( "click", function (event) { fValidateBeforeClose(event)} ); 
}       
_spBodyOnLoadFunctionNames.push( ExecuteOrDelayUntilScriptLoaded(fAddOnCloseHandler, "SP.js") );
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2 Answers

up vote 2 down vote accepted

Good way to remove handlers from dialog's close button is using $clearHandlers Method.

Check code below:

function fValidateBeforeClose(event) {
    var isValid = true;
    //set IsValid value
    if(isValid)
    {
       //close dialog
       SP.UI.ModalDialog.get_childDialog().close();
    }
    else
    {
      alert('Not valid');
    }
}  

function fAddOnCloseHandler() {
    var oCloseButton = $("a[id^='DlgClose']");

    $clearHandlers(oCloseButton.get(0));

    $(oCloseButton).on("click", function (event) { fValidateBeforeClose(event)} );
}   

_spBodyOnLoadFunctionNames.push( ExecuteOrDelayUntilScriptLoaded(fAddOnCloseHandler, "SP.js") );
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Worked. I modify your answer, to remove unnecessary element search in DOM. – dbardakov May 22 at 11:49
Ok, I approved it. – Andrew May 22 at 12:01
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up vote 1 down vote

I think you should remove old event handler 

 var js = oCloseButton.attr("onclick");
 oCloseButton.attr("onclick", "");//remove sharepoint click handler...
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Good catch,jQuery(oCloseButton).off().find("*").off(); seems working. Though, I liked "the SharePoint way" provided by @Andrew better. – dbardakov May 22 at 11:48
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