/// <summary>
/// Waits for an expression to be evaluated to a truthy value
/// </summary>
/// <param name="script">Expression to be evaluated in browser context</param>
/// <param name="options">Optional waiting parameters</param>
/// <returns>A task that resolves when the <c>script</c> returns a truthy value</returns>
/// <seealso cref="Page.WaitForExpressionAsync(string, WaitForFunctionOptions)"/>
/// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>
public async Task <JSHandle> WaitForExpressionAsync(string script, WaitForFunctionOptions options)
{
using (var waitTask = new WaitTask(this, script, true, "function", options.Polling, options.PollingInterval, options.Timeout))
{
return(await waitTask.Task);
}
}
/// <summary>
/// Waits for a function to be evaluated to a truthy value
/// </summary>
/// <param name="script">Function to be evaluated in browser context</param>
/// <param name="options">Optional waiting parameters</param>
/// <param name="args">Arguments to pass to <c>script</c></param>
/// <returns>A task that resolves when the <c>script</c> returns a truthy value</returns>
/// <seealso cref="Page.WaitForFunctionAsync(string, WaitForFunctionOptions, object[])"/>
/// <exception cref="WaitTaskTimeoutException">If timeout occurred.</exception>
public async Task <JSHandle> WaitForFunctionAsync(string script, WaitForFunctionOptions options, params object[] args)
{
using (var waitTask = new WaitTask(this, script, false, "function", options.Polling, options.PollingInterval, options.Timeout, args))
{
return(await waitTask.Task);
}
}
private async Task <ElementHandle> WaitForSelectorOrXPathAsync(string selectorOrXPath, bool isXPath, WaitForSelectorOptions options = null)
{
options = options ?? new WaitForSelectorOptions();
var timeout = options.Timeout ?? _timeoutSettings.Timeout;
const string predicate = @"
function predicate(selectorOrXPath, isXPath, waitForVisible, waitForHidden) {
const node = isXPath
? document.evaluate(selectorOrXPath, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue
: document.querySelector(selectorOrXPath);
if (!node)
return waitForHidden;
if (!waitForVisible && !waitForHidden)
return node;
const element = node.nodeType === Node.TEXT_NODE ? node.parentElement : node;
const style = window.getComputedStyle(element);
const isVisible = style && style.visibility !== 'hidden' && hasVisibleBoundingBox();
const success = (waitForVisible === isVisible || waitForHidden === !isVisible);
return success ? node : null;
function hasVisibleBoundingBox() {
const rect = element.getBoundingClientRect();
return !!(rect.top || rect.bottom || rect.width || rect.height);
}
}";
var polling = options.Visible || options.Hidden ? WaitForFunctionPollingOption.Raf : WaitForFunctionPollingOption.Mutation;
using var waitTask = new WaitTask(
this,
predicate,
false,
$"{(isXPath ? "XPath" : "selector")} '{selectorOrXPath}'{(options.Hidden ? " to be hidden" : string.Empty)}",
polling,
null,
timeout,
new object[] { selectorOrXPath, isXPath, options.Visible, options.Hidden });
var handle = await waitTask.Task.ConfigureAwait(false);
if (!(handle is ElementHandle elementHandle))
{
if (handle != null)
{
await handle.DisposeAsync().ConfigureAwait(false);
}
return(null);
}
return(elementHandle);
}
internal async Task <JSHandle> WaitForExpressionAsync(string script, WaitForFunctionOptions options)
{
using var waitTask = new WaitTask(
this,
script,
true,
"function",
options.Polling,
options.PollingInterval,
options.Timeout ?? _timeoutSettings.Timeout);
return(await waitTask
.Task
.ConfigureAwait(false));
}
