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RequestStart

events

Fired when the data source makes a remote service request.

The event handler function context (available via the this keyword) will be set to the data source instance.

It is possible to prevent the remote request. To achieve this, execute e.preventDefault() in the handler function.

This event can be prevented only for read requests.

requestStart

Event Data

e.sender `kendo.data.DataSource`

The data source instance which fired the event.

e.type `String`

The type of the request.

Set to:

"create"
"read"
"update"
"destroy"

<script>
var dataSource = new kendo.data.DataSource({
  transport: {
    read: {
        url: "https://demos.telerik.com/service/v2/core/products"
    }
  },
  requestStart: function(e) {
/* The result can be observed in the DevTools(F12) console of the browser. */
    console.log("request started");
  }
});
dataSource.fetch();
</script>

<script>
function dataSource_requestStart(e) {
/* The result can be observed in the DevTools(F12) console of the browser. */
  console.log("request started");
}
var dataSource = new kendo.data.DataSource({
  transport: {
    read: {
        url: "https://demos.telerik.com/service/v2/core/products"
    }
  }
});
dataSource.bind("requestStart", dataSource_requestStart);
dataSource.fetch();
</script>

<script>
var dataSource = new kendo.data.DataSource({
  transport: {
    read: {
        url: "https://demos.telerik.com/service/v2/core/products"
    }
  },
  requestStart: function(e) {
    var myCondition = true;
    if (myCondition) {
        e.preventDefault();
    }
  }
});
dataSource.fetch();
</script>

RequestStart

requestStart

Event Data

e.sender kendo.data.DataSource

e.type String

e.sender `kendo.data.DataSource`

e.type `String`