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New: use native slider instead of rangeslider (fixes adaptlearning#161)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import QuestionView from 'core/js/views/questionView'; | ||
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| class SliderView extends QuestionView { | ||
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| initialize(...args) { | ||
| this.onInput = this.onInput.bind(this); | ||
| this.mapValue = this.mapValue.bind(this); | ||
| this.getIndexFromValue = this.getIndexFromValue.bind(this); | ||
| this.normalise = this.normalise.bind(this); | ||
| this.onNumberSelected = this.onNumberSelected.bind(this); | ||
| this.getCorrectAnswers = this.model.getCorrectAnswers.bind(this.model); | ||
| super.initialize(...args); | ||
| } | ||
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| // Used by question to setup itself just before rendering | ||
| setupQuestion() { | ||
| if (this.model.get('_isSubmitted')) return; | ||
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| this.selectItem(this.getIndexFromValue(this.model.get('_selectedItem').value)); | ||
| } | ||
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| onQuestionRendered() { | ||
| this.setReadyStatus(); | ||
| } | ||
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| // this shoud give the index of item using given slider value | ||
| getIndexFromValue(itemValue) { | ||
| const scaleStart = this.model.get('_scaleStart'); | ||
| const scaleEnd = this.model.get('_scaleEnd'); | ||
| return Math.round(this.mapValue(itemValue, scaleStart, scaleEnd, 0, this.model.get('_items').length - 1)); | ||
| } | ||
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| mapIndexToPixels(value, $widthObject) { | ||
| const numberOfItems = this.model.get('_items').length; | ||
| const width = $widthObject ? $widthObject.width() : this.$('.js-slider-scale').width(); | ||
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| return Math.round(this.mapValue(value, 0, numberOfItems - 1, 0, width)); | ||
| } | ||
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| normalise(value, low, high) { | ||
| const range = high - low; | ||
| return (value - low) / range; | ||
| } | ||
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| mapValue(value, inputLow, inputHigh, outputLow, outputHigh) { | ||
| const normal = this.normalise(value, inputLow, inputHigh); | ||
| return normal * (outputHigh - outputLow) + outputLow; | ||
| } | ||
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| onNumberSelected(event) { | ||
| event.preventDefault(); | ||
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| if (this.model.get('_isInteractionComplete')) { | ||
| return; | ||
| } | ||
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| const itemValue = parseFloat($(event.currentTarget).attr('data-id')); | ||
| const index = this.getIndexFromValue(itemValue); | ||
| this.selectItem(index); | ||
| } | ||
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| onCannotSubmit() { } | ||
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| // according to given item index this should make the item as selected | ||
| selectItem(itemIndex) { | ||
| // deselect all items before selecting the chosen item | ||
| this.model.deselectAllItems(); | ||
| const item = this.model.get('_items')[itemIndex]; | ||
| if (!item) return; | ||
| item.selected = true; | ||
| this.model.set('_selectedItem', item); | ||
| } | ||
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| onInput(e) { | ||
| const value = e.target.value; | ||
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| if (this.oldValue === value) { | ||
| return; | ||
| } | ||
| const itemIndex = this.getIndexFromValue(value); | ||
| this.selectItem(itemIndex); | ||
| this.oldValue = value; | ||
| } | ||
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| } | ||
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| SliderView.template = 'slider.jsx'; | ||
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| export default SliderView; |
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