I'll demonstrate how to utilize Deferred in SharePoint Online today.
All functions in SharePoint operate asynchronously, however occasionally we must call a function after
another has finished.
Assuming we have two lists and must retrieve data sequentially from each, delayed is used in this scenario
Hi Friends.
Today we will see how we can swap value of two variable without using the third variable.
For that will perform the below steps.
Step 1. Declare both variables.
var x=13;
var y=21;
Step 2. Add both variable and assign to the first variable.
x=x+y; //13+21, x =34
Step 3. Subtract second variable from first variable as it contains the sum of both variables and assign to the second variable. By doing this, second variable will hold the value of first variable value which was assign in the beginning.
y=x-y; //34-21, y=13Step 4. Now subtract second variable from first variable as it contains the sum of both variables and assign to the first variable. By doing this, first variable will hold the value of second variable value which was assign in the beginning.
x=x-y; //34-13. x=21We will see how we can upload file into the SharPoint library and also
overwrite, if the file is present into the library.
We can use the below code to upload the file into the SharePoint
document library.
Also we can overwrite the file if already present into the Document library.
By default, it does not allow to overwrite the file but through the code
we can set overwrite true.
set_overwrite(true);
<script language="javascript" type="text/javascript">
var fileInput;
$(document).ready(function () {
fileInput = $("#getFile");
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', registerClick);
});
function registerClick() {
//Register File Upload Click Event
$("#addFileButton").click(readFile);
}
var arrayBuffer;
function readFile() {
//Get File Input Control and read the file name
var element = document.getElementById("getFile");
var file = element.files[0];
var parts = element.value.split("\\");
var fileName = parts[parts.length - 1];
//Read File contents using file reader
var reader = new FileReader();
reader.onload = function (e) {
uploadFile(e.target.result, fileName);
}
reader.onerror = function (e) {
alert(e.target.error);
}
reader.readAsArrayBuffer(file);
}
var attachmentFiles;
function uploadFile(arrayBuffer, fileName) {
//Get Client Context,Web and List object.
var clientContext = new SP.ClientContext();
var oWeb = clientContext.get_web();
var oList = oWeb.get_lists().getByTitle('Documents');
//Convert the file contents into base64 data
var bytes = new Uint8Array(arrayBuffer);
var i, length, out = '';
for (i = 0, length = bytes.length; i < length; i += 1) {
out += String.fromCharCode(bytes[i]);
}
var base64 = btoa(out);
//Create FileCreationInformation object using the read file data
var createInfo = new SP.FileCreationInformation();
createInfo.set_content(base64);
createInfo.set_overwrite(true);
createInfo.set_url(fileName);
//Add the file to the library
newFile = oList.get_rootFolder().get_files().add(createInfo);
var myListItem = newFile.get_listItemAllFields();
myListItem.set_item("PID", "33")
//Load client context and execcute the batch
myListItem.update();
clientContext.load(newFile);
clientContext.executeQueryAsync(QuerySuccess, QueryFailure)
}
function QuerySuccess() {
console.log('File Uploaded Successfully.');
alert("File Uploaded Successfully.")
}
function QueryFailure(sender, args) {
console.log('Request failed with error message - ' + args.get_message() + ' . Stack Trace - ' + args.get_stackTrace());
alert("Request failed with error message - " + args.get_message() + " . Stack Trace - " + args.get_stackTrace());
}
</script>
How to get Site, Web, and List name from a list url
Some time we have url of list and need to find its
web, list name ...
Basically, we need to split string and get web name and list.
We have SharPoint to do this in easy way and
also dynamic... :)
Using siteCollection As New
SPSite(listurlfromitems)
Dim
Site As SPSite = siteCollection
Dim
myWeb As SPWeb = siteCollection.OpenWeb()
Dim
_list As SPList = myWeb.GetList(listurlfromitems)
End Using
Here listurlfromitems is a string which holds
URL of list
after that we can find site, web, and list in
Site, myWeb, _list variable
Public Function MoveListItemsSiteToSite(sourceSiteURL As String,sourceList As String, destinationSiteURL As String, destinationList As String, retainMeta As Boolean) As Boolean Using sourceSite As New SPSite(sourceSiteURL) Using sourceWeb As SPWeb = sourceSite.OpenWeb() sourceWeb.AllowUnsafeUpdates = True ' Get your source library Dim source As SPList = sourceWeb.Lists(sourceList) ' Get the collection of items to move, use source.GetItems(SPQuery) if you want a subset Dim items As SPListItemCollection = source.Items Dim fileCount As Integer = 0 Using destSite = New SPSite(destinationSiteURL) Using destinationWeb = destSite.OpenWeb() destinationWeb.AllowUnsafeUpdates = True ' get destination library Dim destination As SPList = destinationWeb.Lists(destinationList) ' Get the root folder of the destination we'll use this to add the files Dim destinationFolder As SPFolder = destinationWeb.GetFolder(destination.RootFolder.Url) ' Now to move the files and the metadata For Each item As SPListItem In items 'Get the file associated with the item Dim file As SPFile = item.File ' Create a new file in the destination library with the same properties Dim newFile As SPFile = destinationFolder.Files.Add(destinationFolder.Url + "/" + file.Name, file.OpenBinary(), file.Properties, True) If retainMeta Then Dim newItem As SPListItem = newFile.Item WriteFileMetaDataFiletoFile(item, newItem) End If file.Delete() fileCount += 1 Next destinationWeb.AllowUnsafeUpdates = False End Using End Using sourceWeb.AllowUnsafeUpdates = False Return True End Using End Using End Function Public Shared Sub WriteFileMetaDataFiletoFile(sourceItem As SPListItem, destinationItem As SPListItem) destinationItem("Editor") = sourceItem("Editor") destinationItem("Modified") = sourceItem("Modified") destinationItem("Modified By") = sourceItem("Modified By") destinationItem("Author") = sourceItem("Author") destinationItem("Created") = sourceItem("Created") destinationItem("Created By") = sourceItem("Created By") destinationItem.UpdateOverwriteVersion() End Sub
