mirror of
https://github.com/ariya/phantomjs.git
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59 lines
2.5 KiB
JavaScript
59 lines
2.5 KiB
JavaScript
/**
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* Wait until the test condition is true or a timeout occurs. Useful for waiting
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* on a server response or for a ui change (fadeIn, etc.) to occur.
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*
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* @param testFx javascript condition that evaluates to a boolean,
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* it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
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* as a callback function.
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* @param onReady what to do when testFx condition is fulfilled,
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* it can be passed in as a string (e.g.: "1 == 1" or "$('#bar').is(':visible')" or
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* as a callback function.
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* @param timeOutMillis the max amount of time to wait. If not specified, 3 sec is used.
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*/
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"use strict";
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function waitFor(testFx, onReady, timeOutMillis) {
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var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 3000, //< Default Max Timout is 3s
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start = new Date().getTime(),
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condition = false,
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interval = setInterval(function() {
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if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
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// If not time-out yet and condition not yet fulfilled
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condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
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} else {
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if(!condition) {
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// If condition still not fulfilled (timeout but condition is 'false')
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console.log("'waitFor()' timeout");
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phantom.exit(1);
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} else {
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// Condition fulfilled (timeout and/or condition is 'true')
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console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");
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typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
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clearInterval(interval); //< Stop this interval
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}
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}
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}, 250); //< repeat check every 250ms
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};
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var page = require('webpage').create();
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// Open Twitter on 'sencha' profile and, onPageLoad, do...
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page.open("http://twitter.com/#!/sencha", function (status) {
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// Check for page load success
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if (status !== "success") {
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console.log("Unable to access network");
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} else {
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// Wait for 'signin-dropdown' to be visible
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waitFor(function() {
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// Check in the page if a specific element is now visible
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return page.evaluate(function() {
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return $("#signin-dropdown").is(":visible");
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});
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}, function() {
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console.log("The sign-in dialog should be visible now.");
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phantom.exit();
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});
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}
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});
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