onbeforeunload.jsp

国外的一套开源CRM

<!-- onBeforeUnload.jsp - Start -->

<SCRIPT LANGUAGE="JScript" TYPE="text/javascript" FOR=window EVENT=onbeforeunload>
 return doOnBeforeUnload();
</SCRIPT>

<SCRIPT LANGUAGE="JScript" TYPE="text/javascript">

 // Create variable we can change to prevent the check from being done.
 var checkForChanges = true;
 
 function doOnBeforeUnload() {
  // This script fires when anything is about to cause the current page to be unloaded.
  // If any unsaved changes have been made, this script returns a non-empty string, which
  // causes a response window to warn the user that changes will be lost, and to allow
  // them to cancel.
 
  // In free form, tabular, and select screen sections built by the UI builder,
  // the preSubmit method fired by the onSubmit event of the form removes this script from
  // the onBeforeUnload event, which prevents this check from happening if the Save button
  // was just clicked.
 
 // alert("event.fromElement: " + event.fromElement);
 
  // See if the checkForChanges flag has been cleared. If so, just allow the
  // body unload to continue.
  if (!checkForChanges) return;
 
  // Look at all forms on the page to see if any of them have any changes.
  var vFormC = document.forms;
  for (var vFormNbr = 0; vFormNbr < vFormC.length; vFormNbr++) {
   //alert("[verifyClose] Window name: " + window.name);
   //alert("[verifyClose] Checking form #" + vFormNbr);
   var vFormObj = vFormC.item(vFormNbr);
   //alert("[verifyClose] Form name is " + vFormObj.name);
 
   // Check the action.  If it's query or view mode, don't bother checking this form.
   var vActionObj = vFormObj.elements.item("action");
   if (vActionObj != null) {
    var vAction = vActionObj.value;
    if (vAction!=null) {
     //alert("Action: " + vAction);
     if (vAction=="<%=UIScreenSection.ACTION_INSERT%>" ||
         vAction=="<%=UIScreenSection.ACTION_UPDATE%>" ||
         vAction=="<%=UIScreenSection.ACTION_UPDATE_SELECT%>") {
 
      // This is an updateable form in an updateable mode. Check for changes.
 
      // Look through all the objects in the form to see if there are any unsaved changes.
      var vElemC = vFormObj.elements;
      for (var vElemNbr = 0; vElemNbr < vElemC.length; vElemNbr++) {
       var vElemObj = vElemC.item(vElemNbr);
 
       // Find out if this is the "add" or "delete" select object that appears on a "select" type screen section.
       //alert("[window.onbeforeunload] Object name: " + vElemObj.name);
       if (vElemObj.name.indexOf("DBSel")>=0) {
        // This is the add or delete select object.  See if there are any items in it.  If so, it means
        // the user has made changes.
        if (vElemObj.length > 0) {
         // Changes have been made.  Trigger the response window.
         return "IF YOU CLICK OK, YOUR CHANGES WILL BE LOST.";
        } else {
         // No changes in this add or delete select object.
        }
       } else {
        // Object is not the add or delete select object.");
        // See if this element is an original value field.
        var vOrigPrefix = "<%=UIWebUtility.HTML_NAME_PREFIX_ORIGINAL%>";
        if (vElemObj.name.indexOf(vOrigPrefix)==0) {
         // This is an original value field.  Compare its value to the current value field.
         var vOrigElemObj = vElemObj;
         var vOrigElemName = vOrigElemObj.name;
         var vCurElemName = vOrigElemName.substring(vOrigPrefix.length, vOrigElemName.length);
         var vCurElemObj = vElemC.item(vCurElemName);
         var vCurElemTagName = vCurElemObj.tagName;
         var vCurElemType = vCurElemObj.type;
         if (vCurElemObj!=null) {
          // Got the current field. Compare the values.
          var vCurValue;
          if (vCurElemTagName=="INPUT" && vCurElemType=="checkbox") {
           // This is a check box.  Use special processing to get current value.
           vCurValue = vCurElemObj.checked ? "Y" : "N";
          } else {
           // Not a check box.
           vCurValue = vCurElemObj.value;
          }
          var vOrigValue = vOrigElemObj.value;
          if (vCurValue != vOrigValue) {
           // This field was changed.  Trigger the response window.
    //       alert('Field ' + vCurElemName + ' changed.');
    //       alert('Original Value: ' + vOrigValue);
    //       alert('Current Value: ' + vCurValue);
           return "IF YOU CLICK OK, YOUR CHANGES WILL BE LOST.";
          }
         }
        }
       }
      }
     }
    }
   }
  }
 }
</SCRIPT>

<!-- onBeforeUnload.jsp - End -->