Delete Selected Item using ECMA

function DeleteSelectedItem() {

    var clientContext = SP.ClientContext.get_current();

    var currentlibid = SP.ListOperation.Selection.getSelectedList();

    if (currentlibid == null) {
        alert('Please select at least one item and try again.');
        window.location.href = window.location.href;
    }
    else {
        var oList = clientContext.get_web().get_lists().getById(currentlibid);
        var selectedItems = SP.ListOperation.Selection.getSelectedItems(clientContext);

        if (selectedItems == '') {
            alert('Please select at least one item and try again.');
            window.location.href = window.location.href; //window.location.reload(true);// = window.location.pathname;
        }
        else {
            if (confirm("Do you want to delete selected items?")) {
             // RecycleSelectedItems();
            /*  var myItems = '';

                for (var i in selectedItems) {

                    myItems += '|' + selectedItems[i].id;

                }
                myItems += '^' + window.parent.location.href;

clientContext.executeQueryAsync
             (
             function (sender, args) {

                 STSNavigate('/_layouts/EXP.FS.DeleteFiles/DeleteFile.aspx?Items=' + myItems);

             }
           

 

             );*/
             
           // DeleteSelectedItem();

                var myItems = '';

                for (var i in selectedItems) {

                    myItems += '|' + selectedItems[i].id;

                }
                myItems += '^' + window.parent.location.href;
               
                var options = SP.UI.$create_DialogOptions();
 
// options.url =getPageName+'?Items='+ myItems;
        options.url = '/_layouts/EXP.FS.DeleteFiles/DeleteFile.aspx?Items='+ myItems;
        options.width = .5;//500;
        options.height =.5;// 400;
        options.dialogReturnValueCallback = Function.createDelegate(null, CloseCallback);
        SP.UI.ModalDialog.showModalDialog(options);
      
   

            }
        }
    }
}

Download selected file using ECMA

function downloadFile() {

var clientContext= SP.ClientContext.get_current();

var currentlibid = SP.ListOperation.Selection.getSelectedList();

if(currentlibid==null){
alert('Please select at least one item and try again.');
window.location.href = window.location.href;
}
else
{
var oList = clientContext.get_web().get_lists().getById(currentlibid);
var selectedItems = SP.ListOperation.Selection.getSelectedItems(clientContext);

if(selectedItems==''){
alert('Please select at least one item and try again.');
window.location.href = window.location.href;
}
else if(selectedItems.length>1){
alert('Please select only one item and try again.');
}
else{
  

    for(var i in selectedItems){

    this.oListItem = oList.getItemById(selectedItems[i].id);
    clientContext.load(this.oListItem);

    var File = this.oListItem.get_file();

clientContext.load(File);

 
clientContext.executeQueryAsync
(
function (sender, args) {
if(File != null) {

var urlValue=File.get_serverRelativeUrl();

STSNavigate('/_layouts/download.aspx?SourceUrl=' + urlValue);

clientContext.executeQueryAsync(
function (sender, args) {
 
 
},
function (sender, args) {
 
});
}
},
function (sender, args) {
  alert('You cannot download a folder. Please select a file and try again.');
 
}
);
 
    
}
}
}
}

Get list items using ECMA script

<script type="text/javascript">
    ExecuteOrDelayUntilScriptLoaded(retrieveMarketingPromotions, "sp.js");
    function retrieveMarketingPromotions() {

        var clientContext = SP.ClientContext.get_current();
        var oList = clientContext.get_web().get_lists().getByTitle('Marketing Promotions');

        var camlQuery = new SP.CamlQuery();
        camlQuery.set_viewXml('<View><Query><OrderBy><FieldRef Name="Modified" Ascending="False" /></OrderBy></Query><RowLimit>4</RowLimit></View>');
        this.collListItem = oList.getItems(camlQuery);
        clientContext.load(collListItem, 'Include(Title, FileRef, ID,Modified)');
        clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceededMP), Function.createDelegate(this, this.onQueryFailedMP));
    }
    function onQuerySucceededMP(sender, args) {

        var listItemEnumerator = collListItem.getEnumerator();

        while (listItemEnumerator.moveNext()) {
            var oListItem = listItemEnumerator.get_current();
            var dispTitle = oListItem.get_item("Title");
            var dispUrl = oListItem.get_item("FileRef");
            var dispLI = document.createElement("li");
            var dispA = document.createElement("a");
            dispA.setAttribute("href", dispUrl);
            dispA.setAttribute("id", dispTitle);
            dispA.innerHTML = dispTitle;
            dispLI.appendChild(dispA);
            document.getElementById("lstMarketing").appendChild(dispLI);
        }
        DisplayCount();
    }

    function onQueryFailedMP(sender, args) {

        alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
    }
</script>

<div id="WebpartGreyBgColor">
  <div class="MarketingImage">
    <img class="image" src="/Style%20Library/Images/img_marketing.jpg" title="Marketing"/>
  </div>
  <div class="MarketingContent">
    <ul id="lstMarketing">
    </ul>
  </div>
  <div class="breakspacer">&nbsp;</div>
  <div class="viewall">
    <p>
    <a href="/Lists/MarketingPromotions/AllItems.aspx">View All</a></p>
  </div>
</div>

Display content from rich text box using Xslt template

usage:

<xsl:call-template name="GetBodyNoTags">
                    <xsl:with-param name="origMsg" select="@Description" ></xsl:with-param>
                    <xsl:with-param name="bodyLength" select="100"></xsl:with-param>
                </xsl:call-template>

Implementation:

<xsl:template name="GetBodyNoTags">
      <xsl:param name="origMsg" />
      <xsl:param name="bodyLength" />
    <xsl:choose>
        <xsl:when test="contains($origMsg, '&lt;')">
            <xsl:variable name="test" select="concat(substring-before($origMsg, '&lt;'), substring-after($origMsg, '&gt;'))"></xsl:variable>
            <xsl:call-template name="GetBodyNoTags">
                <xsl:with-param name="origMsg" select="$test"></xsl:with-param>
                <xsl:with-param name="bodyLength" select="$bodyLength"></xsl:with-param>
            </xsl:call-template>
        </xsl:when>
          <xsl:otherwise>
            <xsl:choose>
                <xsl:when test="string-length($origMsg) &gt; $bodyLength">
                    <xsl:value-of select="concat(substring($origMsg, 0, $bodyLength), '...')" disable-output-escaping="yes"></xsl:value-of>
                </xsl:when>
                <xsl:otherwise>
                    <xsl:value-of select="$origMsg" disable-output-escaping="yes"></xsl:value-of>
                </xsl:otherwise>
            </xsl:choose>                                  
        </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

Video rotator web part

<div>
  <div id="MediaPlayerHost"></div>
  <table  cellpadding="0" cellspacing="0" border="0" style="background-color:#D7D7D7; height:47px; width:362px">
    <tr>
      <td>
        <div id='videospacing' class="videospacing">
          <div id='items' class='items'></div>
        </div>
      </td>
    </tr>
    <tr>
      <td>
        <div class="videopagination">
          <nobr id="pag">1-3</nobr>
        </div>
        <div  class="videonextpre">
          <a id='prev' onclick='javascript:move_prev()' class="left" disabled=disabled></a>
          <a id='next' onclick='javascript:move_next()' class="right"></a>
        </div>
      </td>
    </tr>
  </table>
<script type="text/javascript" src="_layouts/mediaplayer.js"></script>
<script type="text/javascript">
    var idCount = 0, modified = 0, prev = 0, modifiedFirst = 0, idCountFirst = 0, counter = 0, itemCount = 0, pageCount = 4, click = null, count = 0, nextCount = 0; prevCount = 4;

    function move_next() {
        prev = 0;
        counter = 0;
        click = 'next';
        var curCounter = 0;

        jQuery("div[class='items']").find("a").each(function () {
            jQuery(this).remove();
        });

        retrieveListItems();
        document.getElementById('prev').disabled = false;
        document.getElementById('prev').style.cursor = "pointer";
        document.getElementById('prev').className = 'left';
        if (counter == 5) {
            document.getElementById('next').disabled = false;
            document.getElementById('next').style.cursor = "pointer";
            document.getElementById('next').className = 'right';
        }
        else {
            document.getElementById('next').disabled = true;
            document.getElementById('next').style.cursor = "text";
            document.getElementById('next').className = 'rightdim';
            // document.getElementById('next').Attributes.Add('onMouseOver', "this.style.cursor='text'");
        }
        setTimeout('displayPageCount()', 500);

        //            curCounter = jQuery("div[class='items']").find("a").length;
        //           
        //            pageCount = pageCount + curCounter;
        //            if (curCounter == 0) {
        //                document.getElementById("pag").innerHTML = pageCount + ' of ' + itemCount;
        //            }
        //            else {
        //                alert(curCounter);
        //                document.getElementById("pag").innerHTML = (pageCount - curCounter + 1) + '-' + pageCount + ' of ' + itemCount;
        //            }

    }

    function displayPageCount() {
        curCounter = jQuery("div[class='items']").find("a").length;

        pageCount = pageCount + curCounter;
        if (curCounter == 1) {
            nextCount = prevCount + 1;
            document.getElementById("pag").innerHTML = (prevCount + 1) + ' of ' + itemCount;
        }
        else {
            nextCount = prevCount + 1;
            document.getElementById("pag").innerHTML = (prevCount + 1) + '-' + (prevCount + curCounter) + ' of ' + itemCount;
        }
    }

    function displayPrevPageCount() {
        curCounter = jQuery("div[class='items']").find("a").length;
        // alert(curCounter);
        document.getElementById("pag").innerHTML = (nextCount - 4) + '-' + (nextCount - 1) + ' of ' + itemCount;
    }

    function move_prev() {
        prev = 1;
        counter = 0;
        click = 'prev';
        var curCounter = 0;
        jQuery("div[class='items']").find("a").each(function () {
            jQuery(this).remove();
        });
        retrieveListItems();
        document.getElementById('next').disabled = false;
        document.getElementById('next').style.cursor = "pointer";
        document.getElementById('next').className = 'right';

        // curCounter = jQuery("div[class='items']").find("a").length;
        pageCount = pageCount - curCounter;
        if ((nextCount - 4) == 1) {
            document.getElementById('prev').disabled = true;
            document.getElementById('prev').style.cursor = "text";
            document.getElementById('prev').className = 'leftdim';
        }
        else {
            document.getElementById('prev').disabled = false;
            document.getElementById('prev').style.cursor = "pointer";
            document.getElementById('prev').className = 'left';
        }
        prevCount = nextCount - 1;
        document.getElementById("pag").innerHTML = (nextCount - 4) + '-' + (nextCount - 1) + ' of ' + itemCount;
        // setTimeout('displayPrevPageCount()', 1000);
        //document.getElementById("pag").innerHTML = (pageCount - 3) + '-' + pageCount + ' of ' + itemCount;

    }

    function scroll() {
        $('.items').cycle({
            fx: 'cover',
            speed: 500,
            timeout: 2000
        });
    }

    function getMediaPlayer() {
        var p = document.getElementById("MediaPlayerHost")
        var obj = p.getElementsByTagName("object");
        return obj[0].Content.MediaPlayer;
    }

    function SetMediaSource(imgObj) {
        //alert(imgObj.id);
        jQuery("div[class='items']").find("img").each(function () {
            jQuery(this).attr("class", "photo");
        });
        var imagTga = document.getElementById(imgObj.id);
        if (imagTga != undefined) {
            document.getElementById(imgObj.id).setAttribute("class", "videoselected");
        }
        var p = getMediaPlayer();
        var clickArgs = imgObj.tag.split(";");
        p.MediaSource = clickArgs[0];
        p.PreviewImageSource = clickArgs[1];
        p.AutoPlay = true;
        p.Play();
    }

    function SetMediaSourceImage(imgObj) {
        var p = getMediaPlayer();
        var clickArgs = imgObj.tag.split(";");
        p.PreviewImageSource = clickArgs[1];
        p.AutoPlay = false;
    }

    function DisplayCount() {

        var clientContext = SP.ClientContext.get_current();
        var oList = clientContext.get_web().get_lists().getByTitle('Videos');
        var camlQuery = new SP.CamlQuery();
        camlQuery.set_viewXml('<View><RowLimit></RowLimit></View>');
        this.listItems = oList.getItems(camlQuery);
        clientContext.load(listItems);
        clientContext.executeQueryAsync(
                     Function.createDelegate(this, this.onListItemsLoadSuccess),
                     Function.createDelegate(this, this.onQueryFailed));
        retrieveListItems();
    }

    function onListItemsLoadSuccess(sender, args) {
        var listEnumerator = this.listItems.getEnumerator();
        while (listEnumerator.moveNext()) {
            itemCount++;
        }
        //alert(itemCount);
        document.getElementById("pag").innerHTML = (pageCount - 3) + '-' + pageCount + ' of ' + itemCount;
        if (itemCount == 4) {
            document.getElementById('next').disabled = true;
            document.getElementById('next').style.cursor = "text";
            document.getElementById('next').className = 'rightdim';
        }
        document.getElementById('prev').style.cursor = "text";
        document.getElementById('prev').className='leftdim';
    }

 

    function retrieveListItems() {

        var clientContext = SP.ClientContext.get_current();
        var oList = clientContext.get_web().get_lists().getByTitle('Videos');

        var camlQuery = new SP.CamlQuery();
        if (idCount == 0 && modified == 0) {
            camlQuery.set_viewXml('<View><Query><OrderBy><FieldRef Name="Modified" Ascending="False" /></OrderBy></Query><RowLimit>4</RowLimit></View>');
        }
        else {
            if (prev == 0) {
                var d = Date.parse(modified);
                var mon = new Date(d);
                // 2012-04-18T21:48:39Z
                var fDate = mon.getYear() + '-' + (mon.getMonth() + 1) + '-' + mon.getDate() + 'T' + mon.getHours() + ':' + mon.getMinutes() + ':' + mon.getSeconds() + 'Z';

                camlQuery.set_viewXml('<View><Query><Where><And><Leq><FieldRef Name="Modified" /> ' +
                                  '<Value IncludeTimeValue="TRUE" Type="DateTime">' + fDate + '</Value></Leq><Neq>' +
                                  '<FieldRef Name="ID" /><Value Type="Counter">' + idCount + '</Value></Neq></And></Where><OrderBy>' +
                                  '<FieldRef Name="Modified" Ascending="False" /></OrderBy></Query><RowLimit>5</RowLimit></View>');
            }
            else if (prev == 1) {
                var d = Date.parse(modifiedFirst);
                var mon = new Date(d);
                // 2012-04-18T21:48:39Z
                var fDate = mon.getYear() + '-' + (mon.getMonth() + 1) + '-' + mon.getDate() + 'T' + mon.getHours() + ':' + mon.getMinutes() + ':' + mon.getSeconds() + 'Z';

                camlQuery.set_viewXml('<View><Query><Where><And><Geq><FieldRef Name="Modified" /> ' +
                                  '<Value IncludeTimeValue="TRUE" Type="DateTime">' + fDate + '</Value></Geq><Neq>' +
                                  '<FieldRef Name="ID" /><Value Type="Counter">' + idCountFirst + '</Value></Neq></And></Where><OrderBy>' +
                                  '<FieldRef Name="Modified" Ascending="False" /></OrderBy></Query><RowLimit>5</RowLimit></View>');
            }
        }
        this.collListItem = oList.getItems(camlQuery);

        clientContext.load(collListItem, 'Include(Title, FileRef, ID,Modified,AlternateThumbnailUrl,_Comments)');

        clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));

    }

     //SP.SOD.executeOrDelayUntilScriptLoaded(DisplayCount, 'SP.js');

    function onQuerySucceeded(sender, args) {

        var listItemEnumerator = collListItem.getEnumerator();

        while (listItemEnumerator.moveNext()) {

            var oListItem = listItemEnumerator.get_current();
            //alert(oListItem.get_item("AlternateThumbnailUrl").get_url());
            var previewImgUrl = null;
            var ImgTitle = null;
            var ImgDesc = null;
            if (oListItem.get_item("AlternateThumbnailUrl") != null) {
                previewImgUrl = oListItem.get_item("AlternateThumbnailUrl").get_url();
            }
            if (previewImgUrl == null) {
                previewImgUrl = "/_layouts/images/VideoPreview.png";
            }

            if (oListItem.get_item("Title") != null) {
                ImgTitle = oListItem.get_item("Title");
            }
            else {
                ImgTitle = "";
            }

            mediaPlayer.createMediaPlayer(
          document.getElementById('MediaPlayerHost'),
          'MediaPlayerHost',
          '362px', '179px',
          {
              displayMode: 'Inline',
              mediaTitle: '',
              mediaSource: oListItem.get_item('FileRef'),
              previewImageSource: previewImgUrl,
              autoPlay: false,
              loop: false,
              mediaFileExtensions: 'wmv;wma;avi;mpg;mp3;',
              silverlightMediaExtensions: 'wmv;wma;mp3;'
          });
            idCountFirst = oListItem.get_item("ID");
            modifiedFirst = oListItem.get_item("Modified");
            var imageID = 'image' + count;
            var imgHost = document.getElementById('items');
            var aTag = document.createElement('a');
            aTag.setAttribute('title', ImgTitle);
            var newimg = document.createElement('img');
            newimg.setAttribute('src', previewImgUrl);
            newimg.setAttribute('height', '44px');
            newimg.setAttribute('width', '78px');
            newimg.setAttribute('class', 'photo');
            newimg.setAttribute('id', imageID);
            newimg.setAttribute('tag', oListItem.get_item('FileRef') + ";" + previewImgUrl);
            newimg.setAttribute('onmouseover', "javascript:SetMediaSourceImage(this)");
            newimg.setAttribute('onclick', "javascript:SetMediaSource(this)");
            aTag.appendChild(newimg);
            imgHost.appendChild(aTag);
            count++;
            counter++;
            break;
        }

        while (listItemEnumerator.moveNext()) {
            var oListItem = listItemEnumerator.get_current();
            //var previewImgUrl = oListItem.get_item("AlternateThumbnailUrl");
            var previewImgUrl = null;
            var ImgTitle = null;
            var ImgDesc = null;
            if (oListItem.get_item("AlternateThumbnailUrl") != null) {
                previewImgUrl = oListItem.get_item("AlternateThumbnailUrl").get_url();
            }
            if (previewImgUrl == null) {
                previewImgUrl = "/_layouts/images/VideoPreview.png";
            }

            if (oListItem.get_item("Title") != null) {
                ImgTitle = oListItem.get_item("Title");
            }
            else {
                ImgTitle = "";
            }

            idCount = oListItem.get_item("ID");
            modified = oListItem.get_item("Modified");
            var imgHost = document.getElementById('items');
            var imageID = 'image' + count;
            var aTag = document.createElement('a');
            aTag.setAttribute('title', ImgTitle);
            var newimg = document.createElement('img');
            newimg.setAttribute('src', previewImgUrl);
            newimg.setAttribute('height', '44px');
            newimg.setAttribute('width', '78px');
            newimg.setAttribute('class', 'photo');
            newimg.setAttribute('alt', ImgTitle);
            //newimg, setAttribute('title', ImgTitle);
            newimg.setAttribute('id', imageID);
            newimg.setAttribute('tag', oListItem.get_item('FileRef') + ";" + previewImgUrl);
            newimg.setAttribute('onmouseover', "javascript:SetMediaSourceImage(this)");
            newimg.setAttribute('onclick', "javascript:SetMediaSource(this)");
            aTag.appendChild(newimg);
            imgHost.appendChild(aTag);
            count++;
            counter++;
        }
        if (click == null) {
            document.getElementById("pag").innerHTML = (pageCount - 3) + '-' + pageCount + ' of ' + itemCount;
        }

        //        if (counter != 4) {
        //            document.getElementById('next').disabled = true;
        //        }
    }

    function onQueryFailed(sender, args) {

        alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
    }

</script>