Dialog Modal in SharePoint 2013

function OpenPopUpPage(url, callback, width, height)
#
function OpenPopUpPageWithTitle(url, callback, width, height, title)
#
function OpenPopUpPageWithDialogOptions(dialogOptions)
E.g.,
 <a href="javascript:OpenPopUpPageWithTitle('http://example.com/Pages/another.aspx',null,null,null,'Advanced Search - Tips');">Advanced Search Tips</a>


Reference:
http://wp.ahcheng.com/2013/04/09/calling-dialog-modal-form-in-sharepoint-2013/

Open list item attachments with a click on the paperclip

All you have to do is uploading this script to the Style Library (or any other document libary, SVN or the Hive )  and putting the following snippet into a CEWP or Script Editor Web Part on the page where you want to to have this functionality.

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>
<script src="..location of the script here../ListAttachments.js" type="text/javascript"></script>
<script type="text/javascript">
var argObj = {hideIdColumn:true,
              clickToOpen:false,
              clickMouseover:'Click to open',
              oneClickOpenIfSingle:true};
</script>
Please note: To make this script work, your list view has to have the ID column as well as the attachment column visible.

The four options you can see in the snippet above are as follows:

1.hideIdColumn: Defines whether the ID column will be hidden or not
2.clickToOpen: Defines whether you have to click in the paperclip in order to see the list of attached files or not
3.clickMouseOver: Defines the text in the tooltip when you hover your mouse over the paperclip
4.oneClickOpenIfSingle: Defines if an attachment is directly opened or not if it is the only attachment of the list item

=================================================================
ListAttachments.js
=================================================================

/* List all attachments when clicking the paperclip
 * ---------------------------------------------
 * Created by Alexander Bautz
 * alexander.bautz@gmail.com
 * http://sharepointjavascript.wordpress.com
 * Copyright (c) 2010-2012 Alexander Bautz (Licensed under the MIT X11 License)
 * v1.7 for SharePoint 2010
 * LastMod: 05.06.2012
 * ---------------------------------------------
 * Include reference to:
 *  jquery - http://jquery.com
 * ---------------------------------------------
 * Place code in a CEWP below the list view
*/

/*
 * Edited by Daniel Stoelzner
 * daniel.stoelzner@gmail.com
 * http://spoodoo.com
 * LastMod: Febraury 12th 2014
 * Change: Added compatibility with SharePoint 2013
*/

var argPlaceholder;

jQuery(document).ready(function(){
   customListAttachments(argObj);
})

function customListAttachments(argObj){
 var thisWPContainer, isListView, intName, thisListCTX, thisRow, idColIndex, attcolIndex; 
 if(argPlaceholder===undefined){
  argPlaceholder = argObj;
 }else{
  argObj = argPlaceholder;
 }
 $("div[id^='WebPartWPQ']").each(function(){
  thisWPContainer = $(this);
  isListView = false;
  thisWPContainer.find(".ms-viewheadertr th").each(function(i){  
   intName = $(this).find('div:first').attr('name');
   if(intName=='ID'){
    thisWPContainer.data("idColIndex",this.cellIndex);
    thisWPContainer.data("ctxNum",$(this).find('div:first').attr('CtxNum'));
    // Hide ID column
    if(argObj.hideIdColumn){
     $(this).addClass('dummyHideClass');
    }
   }else if(intName=='Attachments'){
    isListView = true;
    thisWPContainer.data("attcolIndex",this.cellIndex);
   }
  });
  if(!isListView){
   return;
  }
  //if(thisWPContainer.data("idColIndex")==undefined && location.href.match(/ShowInGrid=True/)==null && isListView){
  // alert("The ID column must be in the view.\nYou may hide it in the script call by setting the argument \"hideIdColumn\" to true.");
  //}
  thisListCTX = thisWPContainer.data("ctxNum");
  if(thisListCTX!==undefined){
   thisListCTX = eval("ctx"+thisListCTX);
  } else {
   return;
  }
  
  
  thisWPContainer.find("table.ms-listviewtable tbody[beenthere!=1]").each(function(){  
   // Prevent processing of the same tbody multiple times   
   if($(this).attr('isloaded')!=='false'){
    $(this).attr('beenthere','1');   
    if(this.id.match('aggr')==null){
     $(this).find("tr:has(td.ms-vb2)").each(function(){     
      thisRow = $(this);         
      idColIndex = thisWPContainer.data("idColIndex");
      attcolIndex = thisWPContainer.data("attcolIndex");
      // Hide ID column
      if(argObj.hideIdColumn){
       thisRow.find(">td:eq("+idColIndex+")").addClass('dummyHideClass');
      }
      thisRow.data('itemID',thisRow.find(">td:eq("+idColIndex+")").text());
      thisRow.data('listGuid',thisListCTX.listName);
      if(argObj.clickToOpen){      
       thisRow.find(">td:eq("+attcolIndex+")").find('img').attr('title',argObj.clickMouseover).css('cursor','pointer').click(function(){
        showAtt(this,argObj);
       }); 
      }else{
       thisRow.find(">td:eq("+attcolIndex+")").find('img').attr('title','').css('cursor','wait').mouseover(function(){
        showAtt(this,argObj);
       });     
      }   
     });
    }else if(this.id.match('aggr')!=null && argObj.hideIdColumn){
     $(this).find("td[cellIndex="+thisWPContainer.data("idColIndex")+"]").addClass('dummyHideClass');
    }
   }
  });
 });
 // Hide ID column if specified
 if(argObj.hideIdColumn){
  $(".dummyHideClass").hide();
 }
}

function showAtt(elm,argObj){
 var elmOffset, pageOffset, pTop, pLeft, allAtt, wrapBuffer;
 elmOffset = $(elm).offset();
 pageOffset = $("#s4-workspace").offset();
  
 pTop  = $(elm).offset().top  + 5;
 pLeft = $(elm).offset().left - 60;
  
 allAtt = getAllAttachments($(elm).parents('tr:first').data('listGuid'),$(elm).parents('tr:first').data('itemID'));
 wrapBuffer = [];
 if(allAtt.count===1 && argObj.clickToOpen && argObj.oneClickOpenIfSingle){
  customViewDoc(allAtt.items[0].fullPath);
  return;
 }
 if(allAtt.count>0){       
  $.each(allAtt.items,function(i,item){
   wrapBuffer.push("<div id='customAttDiv_"+i+"' nowrap='nowrap' style='font-family:Arial;font-size:11px;padding:1px'>");
   wrapBuffer.push("<img id='customAtt_"+i+"_icon' style='vertical-align:middle' src='/_layouts/images/ic"+item.ext+".gif' border='0'>&nbsp;");
   wrapBuffer.push("<a href='"+item.fullPath+"' ");
   wrapBuffer.push("id='customAtt_"+i+"' target='_blank'>"); 
   wrapBuffer.push(item.name+"</a></div>");
  });      
 }  
 $("#customAttPreviewWrapper").html(wrapBuffer.join('')).css({top:pTop,left:pLeft}).fadeIn();
}

// Placeholder for the attachment links
$("div#contentBox").prepend("<div id='customAttPreviewWrapper' style='padding:6px;background-color:white;border-radius: 4px;border:1px gray solid;position:fixed;display:none;cursor:pointer;z-index:999' onmouseout='customMouseOutHideMenu(event)'></div>");

function customViewDoc(url){
 var openOk = ViewDoc(url,'SharePoint.OpenDocuments.3');
 if(!openOk){
  window.open(url,"_blank","status=0,toolbar=0,resizable=1");
 }
}

function getAllAttachments(listName,itemID){
 var returnHTMLBuffer, result, attObj, ext;
 returnHTMLBuffer = [];
 result = {count:0,items:[]};
 attObj = spjs_GetAttachmentCollection({'listName':listName,'listItemID':itemID});
 $.each(attObj,function(name,obj){
  ext = name.substring(name.lastIndexOf('.')+1);
  result.items.push({ext:ext,name:name,fullPath:obj.fullPath});
  result.count++;
 });
 return result;
}

// Overcome the missing onmouseleave event in Firefox
function customMouseOutHideMenu(e){
 var target, relTarg, relTargID, isInWrapper;
 if(!e){
  var e = window.event;
 }
 target = e.srcElement || e.target; 
 relTarg = e.relatedTarget || e.toElement;
 relTargID = $(relTarg).attr('id');
 relTargID = (relTargID===undefined)?'':relTargID;
 isInWrapper = ($(target).attr('id')=='customAttPreviewWrapper' || $(target).parents("div[id='customAttPreviewWrapper']").length>0);
 if(!isInWrapper || relTargID.match('customAtt')==null){
  customHideMenu(true);
 }
}

// Hide menu if user moves mouse outside the container
function customHideMenu(hide){
 if(hide){
  $("#customAttPreviewWrapper").fadeOut();
 }else{
  if(typeof(hideMenu)!='undefined'){
   clearTimeout(hideMenu);
  }
 }
}

/*************************************************************
    Web service interactions
*************************************************************/
/* spjs_GetAttachmentCollection
 Argument type: object
  Object properties: listName,listbaseUrl[optional],listItemID
 LastMod: 18.08.2010
 Used to get the collection of attachments from a list item
*/
function spjs_GetAttachmentCollection(argObj){
 var returnObj, content, fullPath, name;
 if(argObj.listBaseUrl==undefined){
  argObj.listBaseUrl=L_Menu_BaseUrl;
 }
 returnObj = {};
 content = [];
 content.push("<GetAttachmentCollection xmlns='http://schemas.microsoft.com/sharepoint/soap/'>");
 content.push("<listName>"+argObj.listName+"</listName>");
 content.push("<listItemID>"+argObj.listItemID+"</listItemID>");
 content.push("</GetAttachmentCollection>");
 spjs_wrapSoapRequest(argObj.listBaseUrl+"/_vti_bin/lists.asmx","http://schemas.microsoft.com/sharepoint/soap/GetAttachmentCollection",content,function(data){
  $(data).find('Attachment').each(function(i){  
   fullPath = $(this).text();
   name = fullPath.substring(fullPath.lastIndexOf('/')+1);
   returnObj[name]={'fullPath':fullPath,'index':i};   
  }); 
 });
 return returnObj;
}

/* spjs_wrapSoapRequest 
 - internal use
 LastMod: 07.07.2010
*/
function spjs_wrapSoapRequest(webserviceUrl,requestHeader,soapBody,successFunc){
 var xmlWrap = [];
  xmlWrap.push("<?xml version='1.0' encoding='utf-8'?>");
  xmlWrap.push("<soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>");
  xmlWrap.push("<soap:Body>");
  xmlWrap.push(soapBody);
  xmlWrap.push("</soap:Body>");
  xmlWrap.push("</soap:Envelope>");
  xmlWrap = xmlWrap.join('');
 $.ajax({
  async:false,
  type:"POST",
  url:webserviceUrl,
  contentType:"text/xml; charset=utf-8",
  processData:false,
  data:xmlWrap,
  dataType:"xml",
  beforeSend:function(xhr){
   xhr.setRequestHeader('SOAPAction',requestHeader);
  },
  success:successFunc
 });
}

function customTimeoutLoop(id){
var obj = $("#"+id);
var isloaded = ($(obj).attr('isloaded')=='true')?true:false;
 if(!isloaded){
  $(obj).hide();
  setTimeout(function(){
   customTimeoutLoop(id);
  },10);
 }else{
  $(obj).show();
  customListAttachments(); 
 }
}

function ExpGroupRenderData(d, a, e) {
    ULSA13: {
    }
    var c = document.getElementById("tbod" + a + "_"), b = document.createElement("DIV"), f = a.split("-");
    b.innerHTML = "<TABLE><TBODY id=\"tbod" + a + "_\" isLoaded=\"" + e + "\">" + d + "</TBODY></TABLE>";
    c.parentNode.replaceChild(b.firstChild.firstChild, c); 
 customTimeoutLoop("tbod" + a + "_");   
}

“This Page has been modified since you opened it. You must open the page again. Refresh page.” error message

open the page in SharePoint designer and add the below script “ MSO_PageHashCode clearing script” :

<script language=”javascript” type=”text/javascript”>
if(document.getElementById(“MSO_PageHashCode”))
{
document.getElementById(“MSO_PageHashCode”).value=”";
}
</script>

Sometimes , You may face this issue when using any button (like asp:linkbutton or asp:button) for navigating to different URL (i.e: using the postback property) because , it’ll submit page.form , So in order to avoid this you should use normal <a href=”"></a> or use asp:hyperlink control.