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HS_Nico
Helper II
Helper II

Best Practice - Where to place JavaScript

Hello everyone,

 

what is your experience with JavaScript in PowerApps? Where is the best place to put my code, in which scenario? My goal is not to have to paste the same code twice.

 

Example 1: Business Process Flows
Can you store code globally for a BPF? E.g. to show or hide the create button (https://docs.microsoft.com/en-us/power-apps/developer/model-driven-apps/clientapi/reference/formcont... ).

 

Example 2: columns/form fields
Multi-selection option fields are not supported by business rules. However, you can implement the desired rule with JavaScript. Is there a way to assign this code to the appropriate column so that it is active in every form.

 

Alternatively, the code of the two examples would have to be stored in every form that works with the BPF or the column.

 

I look forward to feedback
Nico

1 ACCEPTED SOLUTION

Accepted Solutions

Helper Script:

 

// helper functions
'use strict';
var cdmtHelper = window.cdmtHelper || {};
(function () {
	//required for refreshing ESRI map
	// refresh web resource
	this.refreshIframe = function (executionContext, controlName) {
		var formContext = executionContext.getFormContext();
		var control = formContext.getControl(controlName);

		if (control !== null) {
			var iFrame = control.getObject();

			if (iFrame !== null) {
				iFrame.contentDocument.location.reload(true);
			}
		}
	};

	//required for Map.HTML
	// get data parameter from query string, e.g. in HTML web resource
	this.getDataParameter = function () {
		return decodeURIComponent(cdmtHelper.getUrlParameter('data'));
	};

	//required for Map.HTML
	// get parameter from URL
	this.getUrlParameter = function (name) {
		name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
		var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
		var results = regex.exec(location.search);
		return results === null
			? ''
			: decodeURIComponent(results[1].replace(/\+/g, ' '));
	};

	//required for Map.HTML
	// function to fetch records recursively in batches
	this.retrieveMultipleRecordsRecursive = function (
        webApi,
        entityLogicalName,
        options,
        maxPageSize
    ) {
        var totalEntities = [];

        return new Promise(function (resolve, reject) {
            var resolution = function (result) {
                // add current batch to the total array
                totalEntities = totalEntities.concat(result.entities);

                // if more results to be retrieved
                if (result.nextLink) {
                    var nextLinkOptions = "?" + result.nextLink.split("?")[1];
                    cccHelper
                        .retrieveMultipleRecordsRecursive(
                            webApi,
                            entityLogicalName,
                            nextLinkOptions,
                            maxPageSize
                        )
                        .then(resolution, reject);
                }

                // if no more results to be retrieved
                else {
                    resolve({ entities: totalEntities });
                }
            };

            webApi
                .retrieveMultipleRecords(
                    entityLogicalName,
                    options,
                    maxPageSize
                )
                .then(resolution, reject);
        });
    };

	//required for Create Document from Template feature
	this.sendHttpRequestPromise = function (url, data, method, headers) {
		return new Promise(function (resolve, reject) {
			if (method === null || method === undefined) {
				method = 'GET';
			}

			if (headers === null || headers === undefined) {
				headers = [['Accept', 'application/json']];
			}

			var req = new XMLHttpRequest();
			req.open(method, url, true);

			// set request headers
			for (var headerName in headers) {
				if (headers.hasOwnProperty(headerName)) {
					req.setRequestHeader(headerName, headers[headerName]);
				}
			}

			req.onreadystatechange = function () {
				// if complete
				if (req.readyState === 4) {
					// if 200 OK
					if (req.status === 200) {
						resolve(req);
					}

					// if 204 No Content
					else if (req.status === 204) {
						resolve(req);
					}

					// otherwise
					else {
						reject(req);
					}
				}
			};
			req.send(data);
		});
	};

	this.executeFlowFromEV = function (varName, recordID, progressMessage) {
		return new Promise((resolve, reject) => {
			Xrm.Utility.showProgressIndicator(progressMessage);
			cdmtHelper.getEnvironmentVariable(varName).then(
				function (flowUrl) {
					cdmtHelper.executeFlow(flowUrl, recordID).then(
						function () {
							Xrm.Utility.closeProgressIndicator();
							resolve();
						},
						function () {
							Xrm.Utility.closeProgressIndicator();
							reject();
						}
					);
				},
				function () {
					Xrm.Utility.closeProgressIndicator();
					reject();
				}
			);
		});
	};

	this.executeFlow = function (flowUrl, recordID) {
		'use strict';

		//do something here
		return new Promise((resolve, reject) => {
			const input = JSON.stringify({
				id: recordID.replace('{', '')?.replace('}', ''),
			});
			const req = new XMLHttpRequest();
			req.open('POST', flowUrl, true);
			req.setRequestHeader('Content-Type', 'application/json');
			req.send(input);
			req.onreadystatechange = function () {
				'use strict';
				if (this.readyState === 4) {
					req.onreadystatechange = null;
					//if response is 200
					if (this.status === 200) {
						resolve();
					} else {
						reject();
					}
				}
			};
		});
	};

	// Returns a promise to retrieve the given environment variable's value
	this.getEnvironmentVariable = function (varName, currentValue) {
		return new Promise(function (resolve, reject) {
			// If value has been retrieved already
			if (currentValue !== undefined) {
				// Don't bother retrieving again
				resolve(currentValue);
			} else {
				// Retrieve environment variable record
				Xrm.WebApi.retrieveMultipleRecords(
					'environmentvariabledefinition',
					`?$top=1&fetchXml=<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='true'>
                            <entity name='environmentvariabledefinition'>
                                <attribute name='defaultvalue' />
                                <filter type='and'>
                                    <condition attribute='schemaname' operator='eq' value='${varName}' />
                                </filter>
                                <link-entity name='environmentvariablevalue' from='environmentvariabledefinitionid' to='environmentvariabledefinitionid' link-type='outer' alias='varvalue'>
                                    <attribute name='value' />      
                                </link-entity>
                            </entity>
                        </fetch>`
				).then(function (result) {
					if (result.entities.length === 0) {
						reject(`Environment variable "${varName}" not found.`);
					} else {
						var environmentVariable = result.entities[0];

						if (typeof environmentVariable['varvalue.value'] !== 'undefined') {
							resolve(environmentVariable['varvalue.value']);
						} else if (
							typeof environmentVariable.defaultvalue !== 'undefined'
						) {
							resolve(environmentVariable.defaultvalue);
						} else {
							reject(
								`Environment variable "${varName}" does not contain a value.`
							);
						}
					}
				}, reject);
			}
		});
	};
	//function to open a form as a dialog

	this.openDialog = function (
		FirstSelectedItemId,
		SelectedEntityTypeName,
		HeightValue,
		WidthValue,
		PostionValue
	) {
		const pageInput = {
			pageType: 'entityrecord',
			entityName: SelectedEntityTypeName, //uses the entiyty type of the record selected in your subgrid
			entityId: FirstSelectedItemId, //uses the id of the record you have selected
		};
		const navigationOptions = {
			target: 2, //show on top of current record
			height: { value: HeightValue, unit: '%' }, //controls hieght of dialog
			width: { value: WidthValue, unit: '%' }, //controls width of dialog
			position: PostionValue, //1 = centre of screen, 2 = right of screen
		};

		Xrm.Navigation.navigateTo(pageInput, navigationOptions);
	};
}.call(cdmtHelper));

 

 

 

 

Form Script:

 

 

 

 

function cancelSlot(primaryControl, environmentVariableName) {
	const formContext = primaryControl;
	const recordId = formContext.data.entity
		.getId()
		.replace('{', '')
		.replace('}', '');

	cdmtHelper
		.executeFlowFromEV(
			environmentVariableName,
			recordId,
			'Slot cancellation in progress...'
		)
		.then(
			function () {
				const alertStrings = {
					confirmButtonLabel: 'OK',
					text: 'Slot Cancellation Successful',
					title: 'Information',
				};
				const alertOptions = { height: 120, width: 260 };
				Xrm.Navigation.openAlertDialog(alertStrings, alertOptions).then(
					function confirmButtonPressed() {
						formContext.data.refresh(true);
					},
					function dialogClosed() {
						formContext.data.refresh(true);
					}
				);
			},

			function () {
				const alertStrings = {
					confirmButtonLabel: 'OK',
					text: 'Slot Cancellation Failed',
					title: 'Information',
				};
				const alertOptions = { height: 120, width: 260 };
				Xrm.Navigation.openAlertDialog(alertStrings, alertOptions).then(
					function confirmButtonPressed() {
						formContext.data.refresh(true);
					},
					function dialogClosed() {
						formContext.data.refresh(true);
					}
				);
			}
		);
}

 

 

 

 

 

Basically the helper script holds my reusable code, the form scipt calls that piece of code, and passes in parameters required for the function to run

 

 

View solution in original post

6 REPLIES 6
SBax
Super User
Super User

I use a helper script to hold my commonly used functions.

 

For example I have a script that sends a HTTP request, another that shows/hides a section based on a defined criteria, and other functions that I use in multiple places.

 

I then create a function in whichever relevant location(s) to simply call the function from my helper script and pass in the required inputs 

 

Hopefully this makes sense, if not, let me know and I'll share some screenshots of the helper script, and an example function to call one of the functions from the helper script

HS_Nico
Helper II
Helper II

Many thanks for your response.

 

I would be very happy to see more details (screenshots, examples) of your solution.

SBax
Super User
Super User

I will upload an example later today, most likely on my lunch break 

 

Helper Script:

 

// helper functions
'use strict';
var cdmtHelper = window.cdmtHelper || {};
(function () {
	//required for refreshing ESRI map
	// refresh web resource
	this.refreshIframe = function (executionContext, controlName) {
		var formContext = executionContext.getFormContext();
		var control = formContext.getControl(controlName);

		if (control !== null) {
			var iFrame = control.getObject();

			if (iFrame !== null) {
				iFrame.contentDocument.location.reload(true);
			}
		}
	};

	//required for Map.HTML
	// get data parameter from query string, e.g. in HTML web resource
	this.getDataParameter = function () {
		return decodeURIComponent(cdmtHelper.getUrlParameter('data'));
	};

	//required for Map.HTML
	// get parameter from URL
	this.getUrlParameter = function (name) {
		name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
		var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
		var results = regex.exec(location.search);
		return results === null
			? ''
			: decodeURIComponent(results[1].replace(/\+/g, ' '));
	};

	//required for Map.HTML
	// function to fetch records recursively in batches
	this.retrieveMultipleRecordsRecursive = function (
        webApi,
        entityLogicalName,
        options,
        maxPageSize
    ) {
        var totalEntities = [];

        return new Promise(function (resolve, reject) {
            var resolution = function (result) {
                // add current batch to the total array
                totalEntities = totalEntities.concat(result.entities);

                // if more results to be retrieved
                if (result.nextLink) {
                    var nextLinkOptions = "?" + result.nextLink.split("?")[1];
                    cccHelper
                        .retrieveMultipleRecordsRecursive(
                            webApi,
                            entityLogicalName,
                            nextLinkOptions,
                            maxPageSize
                        )
                        .then(resolution, reject);
                }

                // if no more results to be retrieved
                else {
                    resolve({ entities: totalEntities });
                }
            };

            webApi
                .retrieveMultipleRecords(
                    entityLogicalName,
                    options,
                    maxPageSize
                )
                .then(resolution, reject);
        });
    };

	//required for Create Document from Template feature
	this.sendHttpRequestPromise = function (url, data, method, headers) {
		return new Promise(function (resolve, reject) {
			if (method === null || method === undefined) {
				method = 'GET';
			}

			if (headers === null || headers === undefined) {
				headers = [['Accept', 'application/json']];
			}

			var req = new XMLHttpRequest();
			req.open(method, url, true);

			// set request headers
			for (var headerName in headers) {
				if (headers.hasOwnProperty(headerName)) {
					req.setRequestHeader(headerName, headers[headerName]);
				}
			}

			req.onreadystatechange = function () {
				// if complete
				if (req.readyState === 4) {
					// if 200 OK
					if (req.status === 200) {
						resolve(req);
					}

					// if 204 No Content
					else if (req.status === 204) {
						resolve(req);
					}

					// otherwise
					else {
						reject(req);
					}
				}
			};
			req.send(data);
		});
	};

	this.executeFlowFromEV = function (varName, recordID, progressMessage) {
		return new Promise((resolve, reject) => {
			Xrm.Utility.showProgressIndicator(progressMessage);
			cdmtHelper.getEnvironmentVariable(varName).then(
				function (flowUrl) {
					cdmtHelper.executeFlow(flowUrl, recordID).then(
						function () {
							Xrm.Utility.closeProgressIndicator();
							resolve();
						},
						function () {
							Xrm.Utility.closeProgressIndicator();
							reject();
						}
					);
				},
				function () {
					Xrm.Utility.closeProgressIndicator();
					reject();
				}
			);
		});
	};

	this.executeFlow = function (flowUrl, recordID) {
		'use strict';

		//do something here
		return new Promise((resolve, reject) => {
			const input = JSON.stringify({
				id: recordID.replace('{', '')?.replace('}', ''),
			});
			const req = new XMLHttpRequest();
			req.open('POST', flowUrl, true);
			req.setRequestHeader('Content-Type', 'application/json');
			req.send(input);
			req.onreadystatechange = function () {
				'use strict';
				if (this.readyState === 4) {
					req.onreadystatechange = null;
					//if response is 200
					if (this.status === 200) {
						resolve();
					} else {
						reject();
					}
				}
			};
		});
	};

	// Returns a promise to retrieve the given environment variable's value
	this.getEnvironmentVariable = function (varName, currentValue) {
		return new Promise(function (resolve, reject) {
			// If value has been retrieved already
			if (currentValue !== undefined) {
				// Don't bother retrieving again
				resolve(currentValue);
			} else {
				// Retrieve environment variable record
				Xrm.WebApi.retrieveMultipleRecords(
					'environmentvariabledefinition',
					`?$top=1&fetchXml=<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='true'>
                            <entity name='environmentvariabledefinition'>
                                <attribute name='defaultvalue' />
                                <filter type='and'>
                                    <condition attribute='schemaname' operator='eq' value='${varName}' />
                                </filter>
                                <link-entity name='environmentvariablevalue' from='environmentvariabledefinitionid' to='environmentvariabledefinitionid' link-type='outer' alias='varvalue'>
                                    <attribute name='value' />      
                                </link-entity>
                            </entity>
                        </fetch>`
				).then(function (result) {
					if (result.entities.length === 0) {
						reject(`Environment variable "${varName}" not found.`);
					} else {
						var environmentVariable = result.entities[0];

						if (typeof environmentVariable['varvalue.value'] !== 'undefined') {
							resolve(environmentVariable['varvalue.value']);
						} else if (
							typeof environmentVariable.defaultvalue !== 'undefined'
						) {
							resolve(environmentVariable.defaultvalue);
						} else {
							reject(
								`Environment variable "${varName}" does not contain a value.`
							);
						}
					}
				}, reject);
			}
		});
	};
	//function to open a form as a dialog

	this.openDialog = function (
		FirstSelectedItemId,
		SelectedEntityTypeName,
		HeightValue,
		WidthValue,
		PostionValue
	) {
		const pageInput = {
			pageType: 'entityrecord',
			entityName: SelectedEntityTypeName, //uses the entiyty type of the record selected in your subgrid
			entityId: FirstSelectedItemId, //uses the id of the record you have selected
		};
		const navigationOptions = {
			target: 2, //show on top of current record
			height: { value: HeightValue, unit: '%' }, //controls hieght of dialog
			width: { value: WidthValue, unit: '%' }, //controls width of dialog
			position: PostionValue, //1 = centre of screen, 2 = right of screen
		};

		Xrm.Navigation.navigateTo(pageInput, navigationOptions);
	};
}.call(cdmtHelper));

 

 

 

 

Form Script:

 

 

 

 

function cancelSlot(primaryControl, environmentVariableName) {
	const formContext = primaryControl;
	const recordId = formContext.data.entity
		.getId()
		.replace('{', '')
		.replace('}', '');

	cdmtHelper
		.executeFlowFromEV(
			environmentVariableName,
			recordId,
			'Slot cancellation in progress...'
		)
		.then(
			function () {
				const alertStrings = {
					confirmButtonLabel: 'OK',
					text: 'Slot Cancellation Successful',
					title: 'Information',
				};
				const alertOptions = { height: 120, width: 260 };
				Xrm.Navigation.openAlertDialog(alertStrings, alertOptions).then(
					function confirmButtonPressed() {
						formContext.data.refresh(true);
					},
					function dialogClosed() {
						formContext.data.refresh(true);
					}
				);
			},

			function () {
				const alertStrings = {
					confirmButtonLabel: 'OK',
					text: 'Slot Cancellation Failed',
					title: 'Information',
				};
				const alertOptions = { height: 120, width: 260 };
				Xrm.Navigation.openAlertDialog(alertStrings, alertOptions).then(
					function confirmButtonPressed() {
						formContext.data.refresh(true);
					},
					function dialogClosed() {
						formContext.data.refresh(true);
					}
				);
			}
		);
}

 

 

 

 

 

Basically the helper script holds my reusable code, the form scipt calls that piece of code, and passes in parameters required for the function to run

 

 

HS_Nico
Helper II
Helper II

How do you make your helper script available globally? I am assuming you are uploading the files as web resources. But that doesn't automatically run the code. Or do you load the helper script in each form individually?

SBax
Super User
Super User

Hi @HS_Nico 

 

I add the helper script on the forms that call functions from it 

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As we continue to grow and learn together, it's important to reflect on the valuable insights we've shared. For today's #TuesdayTip, we're excited to take a moment to look back at the last 10 tips we've shared in case you missed any or want to revisit them. Thanks for your incredible support for this series--we're so glad it was able to help so many of you navigate your community experience!   Getting Started in the Community An overview of everything you need to know about navigating the community on one page!  Community Links: ○ Power Apps ○ Power Automate  ○ Power Pages  ○ Copilot Studio    Community Ranks and YOU Have you ever wondered how your fellow community members ascend the ranks within our community? We explain everything about ranks and how to achieve points so you can climb up in the rankings! Community Links: ○ Power Apps ○ Power Automate  ○ Power Pages  ○ Copilot Studio    Powering Up Your Community Profile Your Community User Profile is how the Community knows you--so it's essential that it works the way you need it to! From changing your username to updating contact information, this Knowledge Base Article is your best resource for powering up your profile. Community Links: ○ Power Apps ○ Power Automate  ○ Power Pages  ○ Copilot Studio    Community Blogs--A Great Place to Start There's so much you'll discover in the Community Blogs, and we hope you'll check them out today!  Community Links: ○ Power Apps ○ Power Automate  ○ Power Pages  ○ Copilot Studio    Unlocking Community Achievements and Earning Badges Across the Communities, you'll see badges on users profile that recognize and reward their engagement and contributions. Check out some details on Community badges--and find out more in the detailed link at the end of the article! Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio    Blogging in the Community Interested in blogging? Everything you need to know on writing blogs in our four communities! Get started blogging across the Power Platform communities today! Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio   Subscriptions & Notifications We don't want you to miss a thing in the community! Read all about how to subscribe to sections of our forums and how to setup your notifications! Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio   Getting Started with Private Messages & Macros Do you want to enhance your communication in the Community and streamline your interactions? One of the best ways to do this is to ensure you are using Private Messaging--and the ever-handy macros that are available to you as a Community member! Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio   Community User Groups Learn everything about being part of, starting, or leading a User Group in the Power Platform Community. Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio   Update Your Community Profile Today! Keep your community profile up to date which is essential for staying connected and engaged with the community. Community Links: ○ Power Apps  ○ Power Automate  ○ Power Pages  ○ Copilot Studio   Thank you for being an integral part of our journey.   Here's to many more Tuesday Tips as we pave the way for a brighter, more connected future! As always, watch the News & Announcements for the next set of tips, coming soon!

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Hear from Principal Program Manager, Dimpi Gandhi, to discover the latest enhancements to the Microsoft #PowerUpProgram, including a new accelerated video-based curriculum crafted with the expertise of Microsoft MVPs, Rory Neary and Charlie Phipps-Bennett. If you’d like to hear what’s coming next, click the link below to sign up today! https://aka.ms/PowerUp  

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