/// <summary>
/// Evaluates an expression that returns true or false.
/// </summary>
public static async Task <bool> EvaluateCondition(this Runtime.RuntimeAdapter runtimeAdapter, string condition, long?contextId = null, CancellationToken cancellationToken = default(CancellationToken))
{
var evaluateResponse = await runtimeAdapter.Session.SendCommand <Runtime.EvaluateCommand, Runtime.EvaluateCommandResponse>(new Runtime.EvaluateCommand
{
AwaitPromise = false,
ContextId = contextId,
Expression = $@"
!!((function() {{
return {condition}
}})());
",
GeneratePreview = false,
IncludeCommandLineAPI = true,
ObjectGroup = "Skrapr",
ReturnByValue = false,
Silent = true,
UserGesture = false,
}, cancellationToken : cancellationToken);
if (evaluateResponse.ExceptionDetails != null)
{
throw new JavaScriptException(evaluateResponse.ExceptionDetails);
}
if (evaluateResponse.Result.Type == "boolean" && evaluateResponse.Result.Value is bool)
{
return((bool)evaluateResponse.Result.Value);
}
throw new InvalidOperationException($"Unexpected response from condition evaluation: {evaluateResponse.Result.Type}");
}
/// <summary>
/// Returns an object that contains the css page dimensions as returned by the JavaScript object model.
/// </summary>
/// <returns></returns>
public static async Task <PageDimensions> GetReportedPageDimensions(this Runtime.RuntimeAdapter runtimeAdapter, long?contextId = null)
{
var result = await runtimeAdapter.Session.Runtime.Evaluate(@"
(function() {
'use strict';
var max = function (nums) {
return Math.max.apply(Math, nums.filter(function(x) { return x; }));
};
var widths = [
document.documentElement.clientWidth,
document.body.scrollWidth,
document.documentElement.scrollWidth,
document.body.offsetWidth,
document.documentElement.offsetWidth
];
var heights = [
document.documentElement.clientHeight,
document.body.scrollHeight,
document.documentElement.scrollHeight,
document.body.offsetHeight,
document.documentElement.offsetHeight
];
var result = {
scrollX: window.scrollX,
scrollY: window.scrollY,
fullWidth: max(widths),
fullHeight: max(heights),
windowWidth: window.innerWidth,
windowHeight: window.innerHeight,
devicePixelRatio: window.devicePixelRatio,
originalOverflowStyle: document.documentElement.style.overflow
};
return JSON.stringify(result);
})();
", contextId : contextId);
var resultObject = JObject.Parse(result.Value as string);
return(resultObject.ToObject <PageDimensions>());
}
/// <summary>
/// Evaluates the specified script expression on global object.
/// </summary>
/// <param name="script"></param>
/// <param name="isPromise"></param>
/// <returns></returns>
public static async Task <Runtime.RemoteObject> Evaluate(this Runtime.RuntimeAdapter runtimeAdapter, string script, long?contextId = null, bool returnByValue = false, bool awaitPromise = false, bool silent = false, bool userGesture = true, CancellationToken cancellationToken = default(CancellationToken))
{
var evaluateResponse = await runtimeAdapter.Session.SendCommand <Runtime.EvaluateCommand, Runtime.EvaluateCommandResponse>(new Runtime.EvaluateCommand
{
AwaitPromise = awaitPromise,
ContextId = contextId,
Expression = script,
GeneratePreview = false,
IncludeCommandLineAPI = true,
ObjectGroup = "Skrapr",
ReturnByValue = returnByValue,
Silent = silent,
UserGesture = userGesture
}, cancellationToken : cancellationToken);
if (evaluateResponse.ExceptionDetails != null)
{
throw new JavaScriptException(evaluateResponse.ExceptionDetails);
}
return(evaluateResponse.Result);
}