Find and change multiple paragraph styles and apply condition

Hi @diana_5192, here is a script that can do what I think you want. Give it a try and let me know how it goes. (Note: you must edit the `targetStyleNames` array and `targetConditionName` to match your needs.)

- Mark

/**
 * @file Apply Condition To Target Styles.js
 *
 * You must edit the settings object below, so that
 * the `targetStyleNames` array includes your target
 * paragraph styles, and also the `targetConditionName`
 * string must match the condition you want to apply.
 *
 * @author m1b
 * @discussion https://community.adobe.com/t5/indesign-discussions/find-and-change-multiple-paragraph-styles-and-apply-condition/m-p/14992843/thread-id/598410
 */
function main() {

    var settings = {

        // change these to match your document, add as many as you need
        targetStyleNames: ['Heading A', 'Body A'],

        // change this to match your document's condition
        targetConditionName: 'My Condition',

        showResults: true,

    };

    var doc = app.activeDocument,
        counter = 0;

    for (var i = 0; i < settings.targetStyleNames.length; i++) {

        var result = applyCondition(doc, settings.targetConditionName, settings.targetStyleNames[i]);

        if (undefined == result)
            break;

        counter += result;

    }

    if (settings.showResults)
        alert('Applied condition to ' + counter + ' paragraphs.');

};
app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Apply Condition to Paragraphs');

/**
 * Apply a condition to paragraphs styled with a given style name.
 * @author m1b
 * @version 2024-11-21
 * @param {Document} doc - an Indesign Document.
 * @param {String} conditionName - the target condition's name.
 * @param {String} styleName - the target style's name.
 * @returns {Boolean?} - returns true when operation completed successfully.
 */
function applyCondition(doc, conditionName, styleName) {

    var condition = doc.conditions.itemByName(conditionName),
        style = doc.paragraphStyles.itemByName(styleName),
        counter = 0

    if (!condition.isValid)
        return alert('No condition "' + conditionName + '" found.');

    if (!style.isValid)
        return alert('No paragraph style "' + styleName + '" found.');

    app.findTextPreferences = NothingEnum.NOTHING;
    app.findTextPreferences.appliedParagraphStyle = style;

    var found = doc.findText();

    for (var i = 0; i < found.length; i++) {
        found[i].paragraphs.everyItem().appliedConditions = condition;
        counter += found[i].paragraphs.length;
    }

    return counter;

};

Edit 2024-11-21: added a test to see if applyCondition was successful. Added an optional counter to report on success.