se/SE/static/p5WFS/GetFeature.js

// @require WFS_URL
if (!WFS_URL) throw "Missing WFS_URL"

function p5WFS_ParseFeatureMember(featureMember) { // @returns object from xml element <gml:featureMemeber>
	if (!featureMember) return null
	if (!featureMember.children.length) return null
	var featureNode = featureMember.children[0]
	if (!featureNode) return null
	if (!featureNode.children.length) return null
	var item = {}
	var i = 0
	for (i = 0; i < featureNode.children.length; i++) {
		var field = featureNode.children[i]
		item[ field.localName ] = field.textContent
	}
	return item
}

/**
 * @usage

	p5WFS_GetFeature('p5_default_db:CRM_PROCES', {
		'featureID': 'CRM_PROCES.' + id,
	}).then(function (features) {
		// ...
	}).catch(function (e) {
		// ...
	})

 * @usage

	p5WFS_GetFeature('p5_default_db:CRM_PROCES', {
		'featureID': 'CRM_PROCES.' + id,
	}).then(function (features) {
		if (!features) throw "Nie odnaleziono rekordu id = " + id
		if (!features.length) throw "Nie odnaleziono rekordu id = " + id
		if (1 !== features.length) throw "Bład: API zwróciło za dużo rekordów"
		return features[0]
		console.log('fetched features', features)
	}).then(function (feature) {
		// ...
	}).catch(function (e) {
		// ...
	})

 */
function p5WFS_GetFeature(typeName, query) { // @returns Promise
	var link = WFS_URL + '?SERVICE=WFS&VERSION=1.0.0' +
		'&REQUEST=GetFeature' +
		'&TYPENAME=' + typeName +
		'&SRSNAME=EPSG:3003'
	//	'&Filter=<ogc:Filter><ogc:Or><ogc:PropertyIsEqualTo><ogc:PropertyName>ID</ogc:PropertyName><ogc:Literal>' + id + '</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Or></ogc:Filter>'
	var query = query || {}
	if ('featureID' in query) link += '&featureID=' + query['featureID']
	if ('Filter' in query && 'string' === typeof query['Filter']) {
		var ogcFilter = ('<ogc:Filter>' !== query['Filter'].substr(0, '<ogc:Filter>'.length))
			? '<ogc:Filter>' + query['Filter'] + '</ogc:Filter>'
			: query['Filter']
		;
		link += '&Filter=' + ogcFilter
	}
	if ('sortBy' in query) link += '&sortBy=' + query['sortBy']
	var method = 'GET' // TODO: if long 'ogc:Filter' then POST

	return window.fetch(link, {
		method: method,
		credentials: 'same-origin',
	}).then(function (response) {
		return response.text()
	}).then(function (responseText) {
		return (new DOMParser()).parseFromString(responseText, "text/xml");
	}).then(function (xmlResponse) {
		if (!xmlResponse.children.length) throw "Missing response xml root element"
		return xmlResponse.children[0]
	}).then(function (xmlRoot) {
		if ('FeatureCollection' !== xmlRoot.localName) throw "Missing FeatureCollection as root element in wfs response"
		var features = []
		for (var i = 0; i < xmlRoot.children.length; i++) {
			features.push(p5WFS_ParseFeatureMember(xmlRoot.children[i]))
		}
		return features.filter(function (item) { return !!item; })
	})
}

global.p5WFS_ParseFeatureMember = p5WFS_ParseFeatureMember
global.p5WFS_GetFeature = p5WFS_GetFeature