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97 lines
3.4 KiB
JavaScript
97 lines
3.4 KiB
JavaScript
M.core_question_engine = M.core_question_engine || {};
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/**
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* Flag used by M.core_question_engine.prevent_repeat_submission.
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*/
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M.core_question_engine.questionformalreadysubmitted = false;
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/**
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* Initialise a question submit button. This saves the scroll position and
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* sets the fragment on the form submit URL so the page reloads in the right place.
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* @param id the id of the button in the HTML.
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* @param slot the number of the question_attempt within the usage.
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*/
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M.core_question_engine.init_submit_button(Y, button, slot) {
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Y.on('click', function(e) {
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var scrollpos = document.getElementById('scrollpos');
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if (scrollpos) {
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scrollpos.value = YAHOO.util.Dom.getDocumentScrollTop();
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}
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button.form.action = button.form.action + '#q' + slot;
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}, button);
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}
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/**
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* Initialise a form that contains questions printed using print_question.
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* This has the effect of:
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* 1. Turning off browser autocomlete.
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* 2. Stopping enter from submitting the form (or toggling the next flag) unless
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* keyboard focus is on the submit button or the flag.
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* 3. Removes any '.questionflagsavebutton's, since we have JavaScript to toggle
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* the flags using ajax.
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* 4. Scroll to the position indicated by scrollpos= in the URL, if it is there.
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* 5. Prevent the user from repeatedly submitting the form.
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* @param Y the Yahoo object. Needs to have the DOM and Event modules loaded.
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* @param form something that can be passed to Y.one, to find the form element.
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*/
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M.core_question_engine.init_form = function(Y, form) {
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Y.one(form).setAttribute('autocomplete', 'off');
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Y.on('submit', M.core_question_engine.prevent_repeat_submission, form, form, Y);
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Y.on('key', function (e) {
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if (!e.target.test('a') && !e.target.test('input[type=submit]') &&
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!e.target.test('input[type=img]')) {
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e.preventDefault();
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}
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}, form, 'press:13');
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Y.one(form).all('.questionflagsavebutton').remove();
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var matches = window.location.href.match(/^.*[?&]scrollpos=(\d*)(?:&|$|#).*$/, '$1');
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if (matches) {
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// onDOMReady is the effective one here. I am leaving the immediate call to
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// window.scrollTo in case it reduces flicker.
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window.scrollTo(0, matches[1]);
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Y.on('domready', function() { window.scrollTo(0, matches[1]); });
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// And the following horror is necessary to make it work in IE 8.
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// Note that the class ie8 on body is only there in Moodle 2.0 and OU Moodle.
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if (YAHOO.util.Dom.hasClass(document.body, 'ie')) {
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question_force_ie_to_scroll(matches[1])
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}
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}
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}
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/**
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* Event handler to stop the quiz form being submitted more than once.
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* @param e the form submit event.
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* @param form the form element.
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*/
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M.core_question_engine.prevent_repeat_submission(e, Y) {
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if (M.core_question_engine.questionformalreadysubmitted) {
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e.halt();
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return;
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}
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setTimeout(function() {
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Y.all('input[type=submit]').disabled = true;
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}, 0);
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M.core_question_engine.questionformalreadysubmitted = true;
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}
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/**
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* Beat IE into submission.
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* @param targetpos the target scroll position.
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*/
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M.core_question_engine.force_ie_to_scroll(targetpos) {
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var hackcount = 25;
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function do_scroll() {
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window.scrollTo(0, targetpos);
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hackcount -= 1;
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if (hackcount > 0) {
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setTimeout(do_scroll, 10);
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}
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}
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Y.on('load', do_scroll, window);
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}
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