In the case of multiple field events on the same page, you can create a single script with an if or switch.. case statement to check which field is updated.

For example, to add validation for fields Product, Phone Number, Country, and Category in create page you can create four Client Scripts on create page with field events for each of the fields separately. But it is a best practice to create one Client Script on create page with onChange page event instead of multiple Client Scripts. In page event, you can use conditions to check which field is being changed and add actions inside those conditions. Below is the sample script which has multiple conditions for multiple fields.

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switch (field_name) { case 'Product': var product_name = ZDK.Page.getField('Product').getValue(); var category_field = ZDK.Page.getField('Category'); if (['Sparking cable', 'Ignition box', 'Ignition coil', 'Spark plug'].includes(product_name)) {  category_field.setValue("Ignition system"); ZDK.Page.getField('Number_of_Boxes').setMandatory(true); } else  if (['Speedometer', 'Odometer', 'Voltmeter', 'Temperature gauge'].includes(product_name)) {  category_field.setValue('Gauges and meters'); } break;    case 'Phone_Number': var phone_field = ZDK.Page.getField('Phone_Number'); if (phone_field.getValue().length < 10) { phone_field.showError('Enter a valid phone number'); } break;    case 'Country': ZDK.Page.getField('Phone_Number').setMaxLength(10); break; case 'Category':
if (ZDK.Page.getField('Category').getValue() === 'Ignition system') { ZDK.Page.getField('Number_of_Boxes').setMandatory(true); } break; }

Use the log statement to debug the script wherever required and run the script using the Run option in Client Script IDE. The logs will be available in the Messages panel of Run option. Here is the screenshot of how you can add log statements in your script and where you can see the logs when the script executes.

Whenever you want to try our ZDKs instantly, you can do it in the Terminal Section available in the Run option of Client Script IDE. For example, when you type the below script in the Terminal section and hit enter, you can see the alert message on the screen.

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ZDK.Client.showMessage('Test ZDK Functionality using Terminal section', { type: 'info' });

Client Scripts will execute only for the layout you specify while configuring the Client Script. If you want the script to execute for other layouts or all the layouts of a module, you should create a separate script for each layout.

Make sure that the API calls from a Client Script to other domains are whitelisted in Trusted Domains.

For instance, consider that you want to populate the field Distance with the distance between the Seller Location and the Manufacturer Location fields. In order to achieve this you can write a script onChange page event.

Script:

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//Check if the Location fields are updated
if (field_name === "Seller_Location" || field_name === "Manufacturer_Location") {
//Assign the third party API key to a variable
var api_key = "2Ty9CbowZU8Nu3pl3LQb*********";
//Assign the field "Distance" to a variable
var distance = ZDK.Page.getField("Distance");
//Make the field "Distance" read-only.
distance.setReadOnly(true);
//Get form values
var formObj = ZDK.Page.getForm(); var form = formObj.getValues();
if (form.Manufacturer_Location && form.Seller_Location) {
/*Third party API call with the Location fields values. The domain of the API call should be added to Trusted Domains of Zoho CRM */
var response = fetch("https://api.***/maps/api/dist**/json?origins="+form.Manufacturer_Location+"&destinations="+form.Seller_Location+"&key="+api_key);
//Populate the response in the "Distance field".
response.then(res => res.json()).then(data => { distance.setValue(data.rows[0].elements[0].distance.text); });
}
}

The script will be able to get the response successfully only if the API calls to the domain used is whitelisted in Trusted Domains. Click here to know how to whitelist third party API calls.

Whenever you want to change the order of execution of Client Scripts for a particular page and a particular event, use the Reorder button available in the Client Script Screen.

Remember that the order change is applicable only within a particular event for a particular page in a module.

• To perform validations before the record is saved, use onSave Page Event. So that after entering data for all fields, when the user hits on the save button, the script will get executed.
• To perform validation as soon as data is entered on a particular field use onChange Field Event.
• To perform validation as soon as data is entered for multiple fields use onChange Page Event.
• If you want to display a custom message/ Information box whenever a page is opened, use onLoad Page Event.