为什么要等待ClickOldShares'不管用?即使我在评估中,等待也不起作用。我相信这是一个带引用的小细节,但我现在没有想法。
function clickOldShares(){
console.log("Waiting for Old Shares");
element = document.querySelector("#pagelet_scrolling_pager > div > div > a");
console.log("ELEMENT: " + element);
if(element){
console.log('click and waiting...');
element.click();
console.log('clicked!'+ element);
//THIS WAIT IS NOT WORKING!!!! I DON'T KNOW WHY!!!!
this.wait(2000,clickOldShares);
}
else {
console.log("done!");
}
return element;
};
//Initializing Casper
casper.start('https://www.facebook.com/', function() {
console.log("Entering on Facebook");
});
//Remote Message Handler - now I can see what happen inside evaluates
casper.on('remote.message', function(msg) {
this.echo(msg);
})
//Facebook login
casper.then(function(){
console.log("Login using username and password");
this.evaluate(function(){
document.getElementById("email").value = 'foo@bar';
document.getElementById("pass").value = 'somepass';
document.getElementById("login_form").submit();
})
if(this.exists('#u_0_2 > div:nth-child(1) > div:nth-child(1) > div > a > span')){
console.log("Login ok!");
}
else {
console.log("Login not ok!");
casper.exit();
}
});
casper.thenOpen("https://www.facebook.com/shares/view?id=1063249230414580" ,function(){
console.log("Open post with object-id");
});
casper.thenClick("#pagelet_scrolling_pager > div > div > a",function(){
this.wait(2000,function(){ this.evaluate(clickOldShares)});
});
答案 0 :(得分:0)
this
内)的 casper.evaluate()
指的是window
而不是casper
。您无法在页面上下文中使用casper
。
你需要移动东西:
function clickOldShares(){
var elementAvailable = this.evaluate(function(){
console.log("Waiting for Old Shares");
element = document.querySelector("#pagelet_scrolling_pager > div > div > a");
console.log("ELEMENT: " + element);
if(element){
console.log('click and waiting...');
element.click();
console.log('clicked!'+ element);
}
return !!element;
});
if (elementAvailable) {
this.wait(2000, clickOldShares);
}
};
并像这样使用它:
casper.thenClick("#pagelet_scrolling_pager > div > div > a",function(){
this.wait(2000, clickOldShares);
});
由于无法传递DOM节点,因此需要在页面上下文中存在DOM元素的某种表示形式。这可以通过使用!element
将DOM节点强制转换为布尔值然后立即取消!!element
以检查element
是否为“真实”来轻松实现。