这是我的做法。因为 web 上下文包含 jQuery,我们可以使用它来触发事件,并且一个重要的步骤是我们必须在每次 ajax 调用之后等待和验证,然后才能处理任何下一步。
//set select values
var optionFirstSelect = 125;
var optionSecondSelect = 6;
var optionThirdSelect = 47;
//create casper object
var casper = require('casper').create({
loadImages:false,
verbose: true,
logLevel: 'debug'
});
//open url
casper.start('http://thewebsite.com');
casper.then(function(){
//select option on first select
this.evaluate(function(valueOptionSelect){
$('select#s1').val(valueOptionSelect);
$('select#s1').trigger('change');
},optionFirstSelect);
//wait until the second select is populated
this.waitFor(function check() {
return this.evaluate(function() {
return document.querySelectorAll('select#s2 option').length > 1;
});
}, function then() {
//select option on second select
this.evaluate(function(valueOptionSelect){
$('select#s2').val(valueOptionSelect);
$('select#s2').trigger('change');
},optionSecondSelect);
//wait until the third select is populated
this.waitFor(function check() {
return this.evaluate(function() {
return document.querySelectorAll('select#s3 option').length > 1;
});
}, function then() {
//select option on third select
this.evaluate(function(valueOptionSelect){
$('select#s3').val(valueOptionSelect);
$('select#s3').trigger('change');
},optionThirdSelect);
//wait until table with info is populated after an option is seleted on third select.
this.waitFor(function check() {
return this.evaluate(function() {
return document.querySelectorAll('table#info tbody tr').length > 1;
});
}, function then() {
//Do verifications here ...
});
});
});
});
casper.run(function() {
//finish execution script
this.exit();
});