SharePoint expanded much in REST API from 2013 version onwards. Also, nowadays modern frameworks like angular, knockout are very much useful and powerful in web development.
With this I come up with blog which will showcase basic Create, Read, Update and Delete operations in SharePoint list. I have used knockout js as binding agent. Also knockout. Validation is used to validate data before submit. You can customize the files as per the needs of business.
I personally like to start with UI part so below is HTML required for our application.
HTML:
Above code shows standard input fields in html for first name and last name.
Below that will be tabular format to display data from SharePoint list.
JavaScript:
Read: Create Custom Tiles using HTML CSS and KnockoutJS in SharePoint 2013
I am using SharePoint REST API to get list data and perform other operations.
//load view model after documnet gets loaded
$(document).ready(function () {
mainFunction();
});
var modelInstance=null;
//Function to activate Knockout
function mainFunction() {
modelInstance = new crudViewModel();
modelInstance.errors = ko.validation.group(modelInstance); //for validation of fields
ko.applyBindings(modelInstance);
modelInstance.getEmpDetails();
}
//define view Model
var crudViewModel = function () {
var self = this;
var listName = “EmpDetails”;
self.Id = ko.observable();
self.firstName = ko.observable().extend({ required: “Please enter First name” });
self.lastName = ko.observable().extend({ required: “Please enter Last name” });
self.Employees = ko.observableArray();
self.displayStatus = ko.observable();
self.year = ko.observable(“”);
self.shouldShowMessage= ko.observable(false);
//Function to Read all Employees details
self.getEmpDetails = function(){
$.ajax({
url: _spPageContextInfo.siteAbsoluteUrl + “/_api/web/lists/getbytitle(‘” + listName + “‘)/items”,
type: “GET”,
headers: { “Accept”: “application/json;odata=verbose” },
success: function (data) {
self.Employees(data.d.results);//add employee details to observable
},
error: function (data) {
self.displayStatus(“Error in processing request ” + data.status);
}
});
};
//function to validate data such as blank values are not alllowed in input fields
self.validateAndSave=function(){
if(modelInstance.errors().length === 0){
self.addEmployee(); }
else{alert(“please check your details”);
modelInstance.errors.showAllMessages();
self.displayStatus(“Please fill all required details”);
}
};
//Function to add new employee details in list
self.addEmployee = function (){
self.shouldShowMessage(true);
var itemType = “SP.Data.EmpDetailsListItem”;
var emp = {
“__metadata”: { “type”: itemType },
“firstName”: self.firstName,
“lastName”: self.lastName
};
$.ajax({
url: _spPageContextInfo.siteAbsoluteUrl + “/_api/web/lists/getbytitle(‘” + listName + “‘)/items”,
type: “POST”,
contentType: “application/json;odata=verbose”,
data: ko.toJSON(emp),
headers: {
“Accept”: “application/json;odata=verbose”,
“X-RequestDigest”: $(“#__REQUESTDIGEST”).val()
},
success: function (data) {
alert(“New Employee Created Successfully”);
self.getEmpDetails();//call to display again
},
error: function (data) {
self.displayStatus(“Error in processing request ” + data.status);
}
});
self.clear();
};
//Function to get Specific Employee details using its ID
function getEmpById (callback) {
var url = _spPageContextInfo.siteAbsoluteUrl + “/_api/web/lists/getbytitle(‘” + listName + “‘)/items(” + self.Id()+ “)”;
$.ajax({
url: url,
type: “GET”,
headers: { “Accept”: “application/json;odata=verbose” },
success: function (data) {
callback(data);
},
error: function (data) {
self.displayStatus(“Error in processing request”);
}
});
};
//Function to Update Category
self.updateEmpDetails = function () {
getEmpById(function (data) {
var itemType = “SP.Data.EmpDetailsListItem”;
var emp = {
“__metadata”: { “type”: itemType },
“firstName”: self.firstName,
“lastName”: self.lastName
};
$.ajax({
url: data.d.__metadata.uri,
type: “POST”,
contentType: “application/json;odata=verbose”,
data: ko.toJSON(emp),
headers: {
“Accept”: “application/json;odata=verbose”,
“X-RequestDigest”: $(“#__REQUESTDIGEST”).val(),
“X-HTTP-Method”: “MERGE”,
“If-Match”: data.d.__metadata.etag
},
success: function (data) {
alert(“Employee details updated successfully”);
self.getEmpDetails();//call to display again
self.clear();
},
error: function (data) {
self.displayStatus(“Error in processing request ” + data.status + ” ” + data.statusCode);
}
});
});
};
//Function to Delete Employee details
self.deleteEmpDetails = function (emp) {
getEmpById(function (data) {
var itemType = “SP.Data.EmpDetailsListItem”;
var emp = {
“__metadata”: { “type”: itemType },
“firstName”: self.firstName,
“lastName”: self.lastName
};
$.ajax({
url: data.d.__metadata.uri,
type: “POST”,
contentType: “application/json;odata=verbose”,
data: ko.toJSON(emp),
headers: {
“Accept”: “application/json;odata=verbose”,
“X-RequestDigest”: $(“#__REQUESTDIGEST”).val(),
“X-HTTP-Method”: “DELETE”,
“If-Match”: data.d.__metadata.etag
},
success: function (data) {
alert(“Employee details deleted successfully”);
self.getEmpDetails();//call to display again
self.clear();
},
error: function (data) {
self.displayStatus(“Error in processing request ” + data.status + ” ” + data.statusCode);
}
});
});
};
//Function to Select Employee used for Update and Delete
self.selectEmployee = function (emp) {
self.Id(emp.Id);
self.firstName(emp.firstName);
self.lastName(emp.lastName);
};
//Function to clear all fields
self.clear = function () {
self.displayStatus(“”);
self.Id(0);
self.firstName(“”);
self.lastName(“”);
};
};//End of view model
Finally add content editor web part on any page and refer html file from SharePoint.
End result will be as follows:
Add First Name and last name. Click on Create. Alert will be displayed that “New employee created.” To update and delete first click on table row. It will select employee and then click on update/delete which will perform action in list and will be displayed in UI as well.
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