How can I get the old value of a field in fieldChange function in Client Script?

AI generated answer (using internal Slack threads):

In a client script, you can't directly get the old value of a field in the fieldChange function. However, you can use a workaround by using a global variable to store the initial value of the field in the pageInit function, and then compare or update this value in the fieldChanged function. Here is a sample code snippet:

javascript
var OLDVALS = {
    entity: '',
    trandate: '',
    status: '',
    location: ''
};

/**
* @param {ClientScriptContext.pageInit} context
*/
function pageInit(context) {
    var rec = context.currentRecord;

    Object.keys(OLDVALS).forEach(function (fieldId) {
        OLDVALS[fieldId] = rec.getValue(fieldId);
    });
}

/**
* @param {ClientScriptContext.fieldChanged} context
*/
function fieldChanged(context) {
    var fieldId = context.fieldId;
    var rec = context.currentRecord;

    if (Object.keys(OLDVALS).indexOf(fieldId) > -1 && rec.getValue(fieldId) !== OLDVALS[fieldId]) {
        // Do stuff
    }
}

In this code,

OLDVALS

is a global object that holds the initial values of the fields. In the

pageInit

function, it sets the initial values of the fields. In the

fieldChanged

function, it checks if the current value of the field is different from the initial value. If it is, you can perform your desired operations. Remember to update the

OLDVALS

object in the

fieldChanged

function if the user changes the field more than once. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******