Using ‘page.evaluate’ method, we can evaluate an expression.
Signature
Object evaluate(String expression)
Object evaluate(String expression, Object arg)
Object evaluate(String expression, Object arg, EvaluateOptions options)
Object evaluateAll(String expression)
Object evaluateAll(String expression, Object arg)
JSHandle evaluateHandle(String expression, Object arg)
JSHandle evaluateHandle(String expression)
JSHandle evaluateHandle(String expression, Object arg, EvaluateHandleOptions options)
Example
page.evaluate("someJavaScriptSnippet");
Find the below working application.
runJs.html
<!DOCTYPE html>
<html>
<head> </head>
<body>
<p id="defaultTitle">Hello World</p>
</body>
</html>
FileUtil.java
package com.sample.app.util;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
public class FileUtil {
public static String resourceAsString(String resourceName) throws IOException {
ClassLoader classLoader = FileUtil.class.getClassLoader();
URL url = classLoader.getResource(resourceName);
if (url == null) {
return null;
}
URLConnection urlConnection = url.openConnection();
urlConnection.setUseCaches(false);
try (InputStreamReader inputStreamReader = new InputStreamReader(urlConnection.getInputStream())) {
char[] buffer = new char[1048];
StringBuilder builder = new StringBuilder();
int count = -1;
while ((count = inputStreamReader.read(buffer, 0, buffer.length)) != -1) {
builder.append(buffer, 0, count);
}
return builder.toString();
}
}
}
RunJSFunction.java
package com.sample.app.miscellaneous;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import com.microsoft.playwright.Browser;
import com.microsoft.playwright.BrowserType;
import com.microsoft.playwright.Page;
import com.microsoft.playwright.Playwright;
import com.sample.app.util.FileUtil;
public class RunJSFunction {
public static void main(String[] args) throws IOException, InterruptedException {
try (Playwright playwright = Playwright.create()) {
Browser browser = playwright.chromium()
.launch(new BrowserType.LaunchOptions().setHeadless(false).setSlowMo(100));
final String content = FileUtil.resourceAsString("miscellaneous" + File.separator + "runJs.html");
Page page = browser.newPage();
page.setContent(content);
String title = page.locator("#defaultTitle").textContent();
System.out.println("title : " + title);
TimeUnit.SECONDS.sleep(2);
page.evaluate("document.getElementById('defaultTitle').innerHTML = 'Changed the title';");
title = page.locator("#defaultTitle").textContent();
System.out.println("title : " + title);
TimeUnit.SECONDS.sleep(2);
}
}
}
Output
title : Hello World title : Changed the title
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