Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use addBindingToContext method in Puppeteer

Best JavaScript code snippet using puppeteer

DOMWorld.js

Source:DOMWorld.js

...53            this._contextResolveCallback.call(null, context);54            this._contextResolveCallback = null;55            this._ctxBindings.clear();56            for (const name of this._boundFunctions.keys()) {57                await this.addBindingToContext(name);58            }59            for (const waitTask of this._waitTasks)60                waitTask.rerun();61        }62        else {63            this._documentPromise = null;64            this._contextPromise = new Promise((fulfill) => {65                this._contextResolveCallback = fulfill;66            });67        }68    }69    _hasContext() {70        return !this._contextResolveCallback;71    }72    _detach() {73        this._detached = true;74        for (const waitTask of this._waitTasks)75            waitTask.terminate(new Error('waitForFunction failed: frame got detached.'));76    }77    executionContext() {78        if (this._detached)79            throw new Error(`Execution context is not available in detached frame "${this._frame.url()}" (are you trying to evaluate?)`);80        return this._contextPromise;81    }82    async evaluateHandle(pageFunction, ...args) {83        const context = await this.executionContext();84        return context.evaluateHandle(pageFunction, ...args);85    }86    async evaluate(pageFunction, ...args) {87        const context = await this.executionContext();88        return context.evaluate(pageFunction, ...args);89    }90    async $(selector) {91        const document = await this._document();92        const value = await document.$(selector);93        return value;94    }95    async _document() {96        if (this._documentPromise)97            return this._documentPromise;98        this._documentPromise = this.executionContext().then(async (context) => {99            const document = await context.evaluateHandle('document');100            return document.asElement();101        });102        return this._documentPromise;103    }104    async $x(expression) {105        const document = await this._document();106        const value = await document.$x(expression);107        return value;108    }109    async $eval(selector, pageFunction, ...args) {110        const document = await this._document();111        return document.$eval(selector, pageFunction, ...args);112    }113    async $$eval(selector, pageFunction, ...args) {114        const document = await this._document();115        const value = await document.$$eval(selector, pageFunction, ...args);116        return value;117    }118    async $$(selector) {119        const document = await this._document();120        const value = await document.$$(selector);121        return value;122    }123    async content() {124        return await this.evaluate(() => {125            let retVal = '';126            if (document.doctype)127                retVal = new XMLSerializer().serializeToString(document.doctype);128            if (document.documentElement)129                retVal += document.documentElement.outerHTML;130            return retVal;131        });132    }133    async setContent(html, options = {}) {134        const { waitUntil = ['load'], timeout = this._timeoutSettings.navigationTimeout(), } = options;135        // We rely upon the fact that document.open() will reset frame lifecycle with "init"136        // lifecycle event. @see https://crrev.com/608658137        await this.evaluate((html) => {138            document.open();139            document.write(html);140            document.close();141        }, html);142        const watcher = new LifecycleWatcher(this._frameManager, this._frame, waitUntil, timeout);143        const error = await Promise.race([144            watcher.timeoutOrTerminationPromise(),145            watcher.lifecyclePromise(),146        ]);147        watcher.dispose();148        if (error)149            throw error;150    }151    /**152     * Adds a script tag into the current context.153     *154     * @remarks155     *156     * You can pass a URL, filepath or string of contents. Note that when running Puppeteer157     * in a browser environment you cannot pass a filepath and should use either158     * `url` or `content`.159     */160    async addScriptTag(options) {161        const { url = null, path = null, content = null, type = '' } = options;162        if (url !== null) {163            try {164                const context = await this.executionContext();165                return (await context.evaluateHandle(addScriptUrl, url, type)).asElement();166            }167            catch (error) {168                throw new Error(`Loading script from ${url} failed`);169            }170        }171        if (path !== null) {172            if (!isNode) {173                throw new Error('Cannot pass a filepath to addScriptTag in the browser environment.');174            }175            const fs = await helper.importFSModule();176            let contents = await fs.promises.readFile(path, 'utf8');177            contents += '//# sourceURL=' + path.replace(/\n/g, '');178            const context = await this.executionContext();179            return (await context.evaluateHandle(addScriptContent, contents, type)).asElement();180        }181        if (content !== null) {182            const context = await this.executionContext();183            return (await context.evaluateHandle(addScriptContent, content, type)).asElement();184        }185        throw new Error('Provide an object with a `url`, `path` or `content` property');186        async function addScriptUrl(url, type) {187            const script = document.createElement('script');188            script.src = url;189            if (type)190                script.type = type;191            const promise = new Promise((res, rej) => {192                script.onload = res;193                script.onerror = rej;194            });195            document.head.appendChild(script);196            await promise;197            return script;198        }199        function addScriptContent(content, type = 'text/javascript') {200            const script = document.createElement('script');201            script.type = type;202            script.text = content;203            let error = null;204            script.onerror = (e) => (error = e);205            document.head.appendChild(script);206            if (error)207                throw error;208            return script;209        }210    }211    /**212     * Adds a style tag into the current context.213     *214     * @remarks215     *216     * You can pass a URL, filepath or string of contents. Note that when running Puppeteer217     * in a browser environment you cannot pass a filepath and should use either218     * `url` or `content`.219     *220     */221    async addStyleTag(options) {222        const { url = null, path = null, content = null } = options;223        if (url !== null) {224            try {225                const context = await this.executionContext();226                return (await context.evaluateHandle(addStyleUrl, url)).asElement();227            }228            catch (error) {229                throw new Error(`Loading style from ${url} failed`);230            }231        }232        if (path !== null) {233            if (!isNode) {234                throw new Error('Cannot pass a filepath to addStyleTag in the browser environment.');235            }236            const fs = await helper.importFSModule();237            let contents = await fs.promises.readFile(path, 'utf8');238            contents += '/*# sourceURL=' + path.replace(/\n/g, '') + '*/';239            const context = await this.executionContext();240            return (await context.evaluateHandle(addStyleContent, contents)).asElement();241        }242        if (content !== null) {243            const context = await this.executionContext();244            return (await context.evaluateHandle(addStyleContent, content)).asElement();245        }246        throw new Error('Provide an object with a `url`, `path` or `content` property');247        async function addStyleUrl(url) {248            const link = document.createElement('link');249            link.rel = 'stylesheet';250            link.href = url;251            const promise = new Promise((res, rej) => {252                link.onload = res;253                link.onerror = rej;254            });255            document.head.appendChild(link);256            await promise;257            return link;258        }259        async function addStyleContent(content) {260            const style = document.createElement('style');261            style.type = 'text/css';262            style.appendChild(document.createTextNode(content));263            const promise = new Promise((res, rej) => {264                style.onload = res;265                style.onerror = rej;266            });267            document.head.appendChild(style);268            await promise;269            return style;270        }271    }272    async click(selector, options) {273        const handle = await this.$(selector);274        assert(handle, 'No node found for selector: ' + selector);275        await handle.click(options);276        await handle.dispose();277    }278    async focus(selector) {279        const handle = await this.$(selector);280        assert(handle, 'No node found for selector: ' + selector);281        await handle.focus();282        await handle.dispose();283    }284    async hover(selector) {285        const handle = await this.$(selector);286        assert(handle, 'No node found for selector: ' + selector);287        await handle.hover();288        await handle.dispose();289    }290    async select(selector, ...values) {291        const handle = await this.$(selector);292        assert(handle, 'No node found for selector: ' + selector);293        const result = await handle.select(...values);294        await handle.dispose();295        return result;296    }297    async tap(selector) {298        const handle = await this.$(selector);299        await handle.tap();300        await handle.dispose();301    }302    async type(selector, text, options) {303        const handle = await this.$(selector);304        assert(handle, 'No node found for selector: ' + selector);305        await handle.type(text, options);306        await handle.dispose();307    }308    async waitForSelector(selector, options) {309        const { updatedSelector, queryHandler } = getQueryHandlerAndSelector(selector);310        return queryHandler.waitFor(this, updatedSelector, options);311    }312    /**313     * @internal314     */315    async addBindingToContext(name) {316        // Previous operation added the binding so we are done.317        if (this._ctxBindings.has(name))318            return;319        // Wait for other operation to finish320        if (this._settingUpBinding) {321            await this._settingUpBinding;322            return this.addBindingToContext(name);323        }324        const bind = async (name) => {325            const expression = helper.pageBindingInitString('internal', name);326            try {327                const context = await this.executionContext();328                await context._client.send('Runtime.addBinding', {329                    name,330                    executionContextId: context._contextId,331                });332                await context.evaluate(expression);333            }334            catch (error) {335                // We could have tried to evaluate in a context which was already336                // destroyed. This happens, for example, if the page is navigated while337                // we are trying to add the binding338                const ctxDestroyed = error.message.includes('Execution context was destroyed');339                const ctxNotFound = error.message.includes('Cannot find context with specified id');340                if (ctxDestroyed || ctxNotFound) {341                    // Retry adding the binding in the next context342                    await bind(name);343                }344                else {345                    debugError(error);346                    return;347                }348            }349            this._ctxBindings.add(name);350        };351        this._settingUpBinding = bind(name);352        await this._settingUpBinding;353        this._settingUpBinding = null;354    }355    /**356     * @internal357     */358    async addBinding(name, puppeteerFunction) {359        this._boundFunctions.set(name, puppeteerFunction);360        await this.addBindingToContext(name);361    }362    async _onBindingCalled(event) {363        let payload;364        try {365            payload = JSON.parse(event.payload);366        }367        catch {368            // The binding was either called by something in the page or it was369            // called before our wrapper was initialized.370            return;371        }372        const { type, name, seq, args } = payload;373        if (type !== 'internal' || !this._ctxBindings.has(name))374            return;...

Using AI Code Generation

1const puppeteer = require('puppeteer');2(async () => {3  const browser = await puppeteer.launch({headless: false});4  const page = await browser.newPage();5  const context = browser.defaultBrowserContext();6  await context.addBindingToContext('add', (a, b) => a + b);7  const result = await page.evaluate(() => add(5, 6));8  console.log(result);9  await browser.close();10})();

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.