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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})();

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