Beispiele bedingter Web API-Operationen (clientseitiges JavaScript)
Dieses Beispiel veranschaulicht, wie Sie bedingte Vorgänge mit der Microsoft Dataverse Web-API und clientseitigem JavaScript ausführen.
Hinweis
Dieses Beispiel implementiert die Vorgänge, die unter Beispiel bedingter Web-API-Operationen beschrieben sind und nutzt bekannte clientseitige -JavaScript Konstrukte, die unter Web-API-Beispiele (Clientseitiges JavaScript) beschrieben sind.
Anforderungen
Dies ist erforderlich, um das Beispiel auszuführen:
Auf die Dataverse-Umgebung zugreifen.
Ein Benutzerkonto mit Rechten zum Import von Lösungen und zur Durchführung von CRUD-Vorgängen (normalerweise eine "Systemadministrator" oder "Systemanpasser" Sicherheitsrolle).
Beispiel ausführen
Um dieses Beispiel auszuführen, laden Sie das Lösungspaket hier herunter, extrahieren Sie die Inhalte, und suchen Sie nach der verwalteten WebAPIConditionalOperations_1_0_0_0_managed.zip-Lösung. Importieren Sie die verwaltete Lösung in die Dataverse-Umgebung, und zeigen Sie die Lösungskonfigurationsseite an, um das Beispiel auszuführen. Anweisungen zum Importieren der Beispiellösung finden Sie unter Web-API-Beispiele (clientseitiges JavaScript)
Codebeispiel
Dieses Beispiel umfasst zwei Webressourcen:
WebAPIConditionalOperations.html
Die WebAPIConditionalOperations.html - Webressource stellt den Kontext bereit, in dem der JavaScript-Code ausgeführt wird.
<!DOCTYPE html>
<html>
<head>
<title>Microsoft CRM Web API Conditional Operations Example</title>
<meta charset="utf-8" />
<script
src="../ClientGlobalContext.js.aspx"
type="text/javascript"
></script>
<script src="scripts/es6promise.js"></script>
<script src="scripts/WebAPIConditionalOperations.js"></script>
<style type="text/css">
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
</style>
</head>
<body>
<h1>Microsoft CRM Web API Conditional Operations Example</h1>
<p>
This page demonstrates the CRM Web API's Conditional Operations using
JavaScript.
</p>
<h2>Instructions</h2>
<p>
Choose your preferences and run the JavaScript code. Use your browser's
developer tools to view the output written to the console (e.g.: in IE11
or Microsoft Edge, press F12 to load the Developer Tools).
</p>
<form id="preferences">
<p>This sample deletes the single record it creates.</p>
<input
type="button"
name="start_samples"
value="Start Sample"
onclick="Sdk.startSample()"
/>
</form>
</body>
</html>
WebAPIConditionalOperations.js
Die WebAPIConditionalOperations.js-Webressource ist die JavaScript-Bibliothek, die die Operationen definiert, die dieses Beispiel ausführt.
"use strict";
var Sdk = window.Sdk || {};
/**
* @function getClientUrl
* @description Get the client URL.
* @return {string} The client URL.
*/
Sdk.getClientUrl = function () {
var context;
// GetGlobalContext defined by including reference to
// ClientGlobalContext.js.aspx in the HTML page.
if (typeof GetGlobalContext != "undefined") {
context = GetGlobalContext();
} else {
if (typeof Xrm != "undefined") {
// Xrm.Page.context defined within the Xrm.Page object model for form scripts.
context = Xrm.Page.context;
} else {
throw new Error("Context is not available.");
}
}
return context.getClientUrl();
};
// Global variables.
var clientUrl = Sdk.getClientUrl(); // e.g.: https://org.crm.dynamics.com
var webAPIPath = "/api/data/v8.1"; // Path to the web API.
var account1Uri; // e.g.: Contoso Ltd (sample)
var initialAcctETagVal; // The initial ETag value of the account created
var updatedAcctETagVal; // The ETag value of the account after it is updated
// Entity properties to select in a request.
var contactProperties = ["fullname", "jobtitle", "annualincome"];
var accountProperties = ["name"];
var taskProperties = ["subject", "description"];
/**
* @function request
* @description Generic helper function to handle basic XMLHttpRequest calls.
* @param {string} action - The request action. String is case-sensitive.
* @param {string} uri - An absolute or relative URI. Relative URI starts with a "/".
* @param {object} data - An object representing an entity. Required for create and update actions.
* @param {object} addHeader - An object with header and value properties to add to the request
* @returns {Promise} - A Promise that returns either the request object or an error object.
*/
Sdk.request = function (action, uri, data, addHeader) {
if (!RegExp(action, "g").test("POST PATCH PUT GET DELETE")) {
// Expected action verbs.
throw new Error(
"Sdk.request: action parameter must be one of the following: " +
"POST, PATCH, PUT, GET, or DELETE."
);
}
if (!typeof uri === "string") {
throw new Error("Sdk.request: uri parameter must be a string.");
}
if (RegExp(action, "g").test("POST PATCH PUT") && !data) {
throw new Error(
"Sdk.request: data parameter must not be null for operations that create or modify data."
);
}
if (addHeader) {
if (
typeof addHeader.header != "string" ||
typeof addHeader.value != "string"
) {
throw new Error(
"Sdk.request: addHeader parameter must have header and value properties that are strings."
);
}
}
// Construct a fully qualified URI if a relative URI is passed in.
if (uri.charAt(0) === "/") {
uri = clientUrl + webAPIPath + uri;
}
return new Promise(function (resolve, reject) {
var request = new XMLHttpRequest();
request.open(action, encodeURI(uri), true);
request.setRequestHeader("OData-MaxVersion", "4.0");
request.setRequestHeader("OData-Version", "4.0");
request.setRequestHeader("Accept", "application/json");
request.setRequestHeader("Content-Type", "application/json; charset=utf-8");
if (addHeader) {
request.setRequestHeader(addHeader.header, addHeader.value);
}
request.onreadystatechange = function () {
if (this.readyState === 4) {
request.onreadystatechange = null;
switch (this.status) {
case 200: // Success with content returned in response body.
case 204: // Success with no content returned in response body.
case 304: // Success with Not Modified.
resolve(this);
break;
default: // All other statuses are error cases.
var error;
try {
error = JSON.parse(request.response).error;
} catch (e) {
error = new Error("Unexpected Error");
}
reject(error);
break;
}
}
};
request.send(JSON.stringify(data));
});
};
/**
* @function startSample
* @description Runs the sample.
* This sample demonstrates conditional operations using CRM Web API.
* Results are sent to the debugger's console window.
*/
Sdk.startSample = function () {
// Initializing...
console.log("-- Sample started --");
// Create the CRM account instance.
var account = {
name: "Contoso, Ltd",
telephone1: "555-0000", // Phone number value will increment with each update attempt.
revenue: 5000000,
description: "Parent company of Contoso Pharmaceuticals, etc.",
};
var uri = "/accounts"; // A relative URi to the account entity.
Sdk.request("POST", uri, account)
.then(function (request) {
console.log("Account entity created.");
// Assign the Uri to the created account to a global variable.
account1Uri = request.getResponseHeader("OData-EntityId");
// Retrieve the created account entity.
return Sdk.request(
"GET",
account1Uri + "?$select=name,revenue,telephone1,description"
);
})
.then(function (request) {
// Show the current entity properties.
var account = JSON.parse(request.response);
console.log(JSON.stringify(account, null, 2));
initialAcctETagVal = account["@odata.etag"]; // Save the current ETag value.
// Conditional Get START.
// Attempt to retrieve using conditional GET with current ETag value.
// Expecting nothing in the response because entity was not modified.
console.log("-- Conditional GET section started --");
var ifNoneMatchETag = {
header: "If-None-Match",
value: initialAcctETagVal,
};
return Sdk.request(
"GET",
account1Uri + "?$select=name,revenue,telephone1,description",
null,
ifNoneMatchETag
);
})
.then(function (request) {
console.log("Instance retrieved using ETag: %s", initialAcctETagVal);
if (request.status == 304) {
//Expected:
console.log("\tEntity was not modified so nothing was returned.");
console.log(request.response); //Nothing
} else {
//Not Expected:
console.log(JSON.stringify(JSON.parse(request.response), null, 2));
}
// Modify the account instance by updating telephone1.
// This request operation will also update the ETag value.
return Sdk.request("PUT", account1Uri + "/telephone1", {
value: "555-0001",
});
})
.then(function (request) {
console.log("Account telephone number updated.");
// Re-attempt conditional GET with original ETag value.
var ifNoneMatchETag = {
header: "If-None-Match",
value: initialAcctETagVal,
};
return Sdk.request(
"GET",
account1Uri + "?$select=name,revenue,telephone1,description",
null,
ifNoneMatchETag
);
})
.then(function (request) {
if (request.status == 200) {
// Expected.
console.log("Instance retrieved using ETag: %s", initialAcctETagVal);
var account = JSON.parse(request.response);
updatedAcctETagVal = account["@odata.etag"]; //Capture updated ETag.
console.log(JSON.stringify(account, null, 2));
} else {
// Not Expected.
console.log("Unexpected status: %s", request.status);
}
// Conditional Get END.
// Optimistic concurrency on delete and update START.
console.log("-- Optimistic concurrency section started --");
// Attempt to delete original account (only if matches original ETag value).
var ifMatchETag = { header: "If-Match", value: initialAcctETagVal };
return Sdk.request("DELETE", account1Uri, null, ifMatchETag);
})
.then(
function (request) {
// Success not expected.
console.log("Unexpected status: %s", request.status);
},
// Catch error.
function (error) {
// DELETE: Precondition failed error expected.
console.log("Expected Error: %s", error.message);
console.log(
"\tAccount not deleted using ETag '%s', status code: '%s'.",
initialAcctETagVal,
412
);
// Attempt to update account (if matches original ETag value).
var accountUpdate = {
telephone1: "555-0002",
revenue: 6000000,
};
var ifMatchETag = { header: "If-Match", value: initialAcctETagVal };
return Sdk.request("PATCH", account1Uri, accountUpdate, ifMatchETag);
}
)
.then(
function (request) {
// Success not expected.
console.log("Unexpected status: %s", request.status);
},
// Catch error.
function (error) {
// UPDATE: Precondition failed error expected.
console.log("Expected Error: %s", error.message);
console.log(
"\tAccount not updated using ETag '%s', status code: '%s'.",
initialAcctETagVal,
412
);
// Re-attempt update if matches current ETag value.
var accountUpdate = {
telephone1: "555-0003",
revenue: 6000000,
};
var ifMatchETag = { header: "If-Match", value: updatedAcctETagVal };
return Sdk.request("PATCH", account1Uri, accountUpdate, ifMatchETag);
}
)
.then(function (request) {
if (request.status == 204) {
//No Content
// Expected.
console.log(
"Account successfully updated using ETag '%s', status code: '%s'.",
updatedAcctETagVal,
request.status
);
} else {
// Not Expected.
console.log("Unexpected status: %s", request.status);
}
// Retrieve and output current account state.
return Sdk.request(
"GET",
account1Uri + "?$select=name,revenue,telephone1,description"
);
})
.then(function (request) {
var account = JSON.parse(request.response);
updatedAcctETagVal = account["@odata.etag"]; // Capture updated ETag.
console.log(JSON.stringify(account, null, 2));
// Optimistic concurrency on delete and update END.
// Controlling upsert operations START.
console.log("-- Controlling upsert operations section started --");
// Attempt to insert (without update) some properties for this account.
var accountUpsert = {
telephone1: "555-0004",
revenue: 7500000,
};
var ifNoneMatchResource = { header: "If-None-Match", value: "*" };
return Sdk.request(
"PATCH",
account1Uri,
accountUpsert,
ifNoneMatchResource
);
})
.then(
function (request) {
// Success not expected.
console.log("Unexpected status: %s", request.status);
},
// Catch error.
function (error) {
// Precondition failed error expected.
console.log("Expected Error: %s", error.message);
console.log(
"\tAccount not updated using ETag '%s', status code: '%s'.",
initialAcctETagVal,
412
);
// Attempt to perform same update without creation.
var accountUpsert = {
telephone1: "555-0005",
revenue: 7500000,
};
// Perform operation only if matching resource exists.
var ifMatchResource = { header: "If-Match", value: "*" };
return Sdk.request(
"PATCH",
account1Uri,
accountUpsert,
ifMatchResource
);
}
)
.then(function (request) {
if (request.status == 204) {
// No Content.
// Expected.
console.log("Account updated using If-Match '*'");
} else {
// Not Expected.
console.log("Unexpected status: %s", request.status);
}
// Retrieve and output current account state.
return Sdk.request(
"GET",
account1Uri + "?$select=name,revenue,telephone1,description"
);
})
.then(function (request) {
var account = JSON.parse(request.response);
updatedAcctETagVal = account["@odata.etag"]; // Capture updated ETag.
console.log(JSON.stringify(account, null, 2));
// Controlling upsert operations END.
// Prevent update of deleted entity START.
// Delete the account.
return Sdk.request("DELETE", account1Uri);
})
.then(function (request) {
if (request.status == 204) {
console.log("Account was deleted");
// Attempt to update it.
var accountUpsert = {
telephone1: "555-0005",
revenue: 7500000,
};
// Perform operation only if matching resource exists.
var ifMatchResource = { header: "If-Match", value: "*" };
return Sdk.request(
"PATCH",
account1Uri,
accountUpsert,
ifMatchResource
);
}
})
.then(
function (request) {
// Success not expected.
// Without the If-Match header while using PATCH a new entity would have been created with the
// same ID as the deleted entity.
console.log("Unexpected status: %s", request.status);
},
// Catch error.
function (error) {
// Not found error expected.
console.log("Expected Error: %s", error.message);
console.log("\tAccount not updated because it doesn't exist.");
}
)
.catch(function (error) {
console.log(error.message);
});
};
Siehe auch
Dataverse-Web-API verwenden
Bedingte Vorgänge mithilfe der Web-API ausführen
Web API Beispiele
Beispiel bedingter Web-API-Operationen
Beispiel bedingter Web-API-Operationen (C#)
Web API Beispiele (Clientseitiges JavaScript)
Beispiele grundlegender Web API-Operationen (clientseitiges JavaScript)
Web API-Abfragedatenbeispiele (clientseitiges JavaScript)
Beispiele von Web API-Funktionen und Aktionen (clientseitiges JavaScript)
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