94 lines
2.5 KiB
JavaScript
94 lines
2.5 KiB
JavaScript
// # Foreach Helper
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// Usage: `{{#foreach data}}{{/foreach}}`
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//
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// Block helper designed for looping through posts
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var hbs = require('express-hbs'),
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_ = require('lodash'),
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errors = require('../errors'),
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i18n = require('../i18n'),
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hbsUtils = hbs.handlebars.Utils,
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foreach;
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foreach = function (context, options) {
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if (!options) {
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errors.logWarn(i18n.t('warnings.helpers.foreach.iteratorNeeded'));
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}
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var fn = options.fn,
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inverse = options.inverse,
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columns = options.hash.columns,
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length = _.size(context),
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limit = parseInt(options.hash.limit, 10) || length,
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from = parseInt(options.hash.from, 10) || 1,
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to = parseInt(options.hash.to, 10) || (from - 1) + limit,
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output = '',
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data,
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contextPath;
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if (options.data && options.ids) {
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contextPath = hbsUtils.appendContextPath(options.data.contextPath, options.ids[0]) + '.';
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}
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if (hbsUtils.isFunction(context)) {
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context = context.call(this);
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}
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if (options.data) {
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data = hbs.handlebars.createFrame(options.data);
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}
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function execIteration(field, index, last) {
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if (data) {
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data.key = field;
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data.index = index;
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data.number = index + 1;
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data.first = index === from - 1; // From uses 1-indexed, but array uses 0-indexed.
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data.last = !!last;
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data.even = index % 2 === 1;
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data.odd = !data.even;
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data.rowStart = index % columns === 0;
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data.rowEnd = index % columns === (columns - 1);
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if (contextPath) {
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data.contextPath = contextPath + field;
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}
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}
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output = output + fn(context[field], {
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data: data,
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blockParams: hbsUtils.blockParams([context[field], field], [contextPath + field, null])
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});
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}
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function iterateCollection(context) {
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var count = 1,
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current = 1;
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_.each(context, function (item, key) {
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if (current < from) {
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current += 1;
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return;
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}
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if (current <= to) {
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execIteration(key, current - 1, current === to);
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}
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count += 1;
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current += 1;
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});
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}
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if (context && typeof context === 'object') {
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iterateCollection(context);
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}
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if (length === 0) {
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output = inverse(this);
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}
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return output;
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};
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module.exports = foreach;
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