I have a map which loads a GeoJSON file with multiple line features. When I click a line, the map performs some action (in this case, it's changing the bounds and adds some text underneath it).
var trails = new L.GeoJSON.AJAX('https://googledrive.com/host/0B55_4P6vMjhITEU4Ym9iVG8yZUU/trasee.geojson', {
onEachFeature: function(feature, layer){
layer.on({
click: function() {
map.fitBounds(this.getBounds());
$('#description').html('some text ' + feature.properties.id);
}
});
}
}).addTo(map);
Is it possible to have a different URL for every line, so I can access a particular feature directly (for example, https://websiteurl.com#thisfeatureid)? The link would load the map with the bounds and description of the selected feature.
Here's a JSFiddle of the map:
http://jsfiddle.net/pufanalexandru/qxbuwaeg/
Given a url for a trail such as https://websiteurl.com#5, here's one approach.
When the document is ready (leaflet loaded, geojson loaded, map initialized), but before you set the map bounds, use javascript or a URI parser to check for the param for trail id from the url. Simple example:
var trail_id = document.URL.split('#')[1];
If you get an id, search the trails features for a match on that id, and zoom to the bounds, just as you already are on click
trails.eachLayer(function(layer) {
if (layer.feature.properties.id == trail_id) {
map.fitBounds(this.getBounds());
$('#description').html('some text ' + feature.properties.id);
return;
}
}
Related
A Feature is made of several parts, how do i select just one of them on mouse click in openLayers?
By default the whole feature gets selected.
I think you would need to create a new source containing features with single polygon geometry. Give them a parent property if you need to access the original feature. For example
mainSource.on('addfeature', function(event) {
var geometry = event.feature.getGeometry();
if (geometry.getType() == 'MultiPolygon') {
geometry.getPolygons().forEach(function(polygon) {
splitSource.addFeature(new Feature({
geometry: polygon,
parent: event.feature
});
} else {
splitSource.addFeature(event.feature);
}
});
Using OL3, I set the text on a style dynamically:
var myLayer = new ol.layer.Vector({
source: mySource,
style: function (feature, resolution) {
var style = new ol.style.Style({
text: new ol.style.Text({
text: setText(feature)
})
});
return [style];
}
});
I am trying to later read what is stored in text:
text: setText(feature)
I am trying to retrieve the text on a click event but not sure how to access that property under the feature style (feature is the variable from the event containing the clicked feature):
// Get current display text
var currentFeatureStyle = feature.getStyle();
But when I do that, I get a null currentFeatureStyle.
Also tried looping through the feature:
for (var fid in feature)
{
//what to look for to extract the feature text?
But not sure what to look for to extract the feature text. Any help getting back the feature text from a feature would be appreciated.
Thanks
If someone can come up with a more correct answer please by all means post below. I have created a "workaround" since I could not retrieve the text from the feature. The workaround involves the following:
Inside the method the text is originally set, add the following:
function setText(feature)
{
// First do your normal stuff (set the text of the feature)
var output = "myFeatureText";
// Here is the workaround step 1:
// Create a property and set it to the text
feature.displayText = output;
// Return back value for the setting of the style text
return output;
}
Now the text is also saved in a property called displayText. Note: displayText is a made up property, it does not exist in openlayers.
Step 2 is to retrieve the property you created in step 1 to get the display text. In this example we are retrieving the feature from singleclick but it can be from anywhere else you are using the feature:
map.on('singleclick', function (evt) {
var feature = map.forEachFeatureAtPixel(evt.pixel,
function (feature, layer) {
return feature;
});
// Here is the workaround step 2:
// Get "display text" custom field for this feature
var displayText = feature.displayText;
.
And thats all there is to it. There must be a "correct" way to retrieve the text from the style of the feature but I am not aware of it. If someone know how to by all means post your answer.
I am attempting to create a bar graph that when independent sliders are moved they change two bar graph svg heights at the same time and they are stacked, they are different colors show it shows two separate values in the same graph, basically showing growth vs the current. I am using jquery-ui and D3.js. Currently it only moves the one svg elements instead of both at the same time, Id like them both to move at the same time.
HTML
<div id="slider" class="slider">
<label for="amount">Age</label>
<input type="text" id="amount1" style="border:0; font-weight:bold;">
</div>
<div id="slider1" class="slider">
<label for="amount2">Retirement Age</label>
<input type="text" id="amount2" style="border:0; font-weight:bold;">
</div>
JS
//initialize sliders
jQuery(document).ready(function($) {
$("#slider").slider({
max: 100
});
$("#slider").slider({
min: 18
});
$("#slider1").slider({
max: 100
});
$("#slider1").slider({
min: 18
});
//slider actions
$("#slider, #slider1").slider({
value: 10,
animate: "fast" ,
slide: function (event, ui) {
//capture the value of the specified slider
var selection = $("#slider").slider("value");
var selection1 = $("#slider1").slider("value");
//fill the input box with the slider value
$( "#amount1" ).val( selection );
$( "#amount2" ).val( selection1 );
//set width and height, actually I'm a little confused what this is for
var w = 200;
var h = 200;
//data arrays for svgs
var dataset = [];
var dataset1 = [];
//fill the data arrays with slider values
dataset.push(selection);
dataset.push(selection1 + selection);
//draw rectangle on the page
var rectangle = svg.selectAll("rect")
.classed("collapse", true)
.data(dataset);
**
THIS IS WHERE IT CONFUSES ME
**
//I draw the second rectangle here, however I choose the same svg element,
//Im not sure what other way to get it to appear in the same space but
//I am sure this is what is causing my issues
var rectangle1 = svg.selectAll("rect")
.classed("collapse", true)
.data(dataset1);
//not sure what this does
rectangle.enter().append("rect");
rectangle1.enter().append("rect");
rectangle.attr("width", 200).transition().attr("fill", "#A02222").attr("height", function (d) { console.log('d is ' + d);
return d;
}).attr("x", function (d) {
return 40; //I dont know why I return 40?
}).attr("y", function (d) {
return 40; //Same here dont know why I return 40?
});
rectangle1.attr("width", 200).transition().attr("height", function (d) { console.log('d is ' + d);
return d;
}).attr("x", function (d) {
return 40; //I dont know why I return 40?
}).attr("y", function (d) {
return 40; //Same here dont know why I return 40?
});
}
// slider actions ends here
});
//Create SVG element
var svg = d3.select(".svgContain").append("svg").attr("width", 125).attr("height", 300);
});
For starters, you may want to follow this tutorial: http://bl.ocks.org/mbostock/3886208
The "return 40;" that you are wondering about are actually what will specify the position and dimensions of the rect's you're appending to the svg. Those shouldn't just be 40, they should be bound to values in the data set, or based on the index of the bar's series in the set of series or something more meaningful than 40.
There is a stacked bar chart data processor that will take a set of series and spit out a new set of series coordinate definitions that make it easier to calculate how rect's will stack in svg coordinate space: https://github.com/mbostock/d3/wiki/Stack-Layout
Then, there's the more general issue of how to deal with these "nested" data sets where you have series, and in the series there are values and you don't want to have to manually track and select individual series. There are several ways to handle this sort of situation. If you know you will only ever have two series, and you really want fine-grained control over each independently, you could assign the top level object an id and then start the data join for each of the plots by selecting that top level object by id... eg:
var container1 = d3.select("#myContainer1);
container1.selectAll("rect").data(myData1).append("rect");
var container2 = d3.select("#myContainer2);
container2.selectAll("rect").data(myData2).append("rect");
If you do something like that, the first select basically sets the context of the subsequent selects. So, only the rects inside of the "#myContainer1" or "#myContainer2" will get selected by each "selectAll" based on which context you're in.
The other approach is to use nested selections. Nested selections are a little more complicated to wrap your head around, but 90% of the time, this is the approach I use. With nested selections, you would restructure your data slightly and then apply nested selects/joins to bind each series to a dom element and then the values of each series to subelements of each of the series dom elements.
First, read this: http://bost.ocks.org/mike/nest/
and then try making your data something more like this:
data = [
{ key: "series1", values: [...]},
{ key: "series2", values: [...]}
];
Then, you will want to do a nested selection where you start with a selection of the "data" array and bind it to whatever svg or html element you have that wraps each of the two series.
var series = d3.select("svg").selectAll("g.series")
.data(data, function(d){return d.key; });
series.enter().append("g").attr("class", "series");
At this point, d3 will have added a "g" element to your svg element for each series and bound the series object (including the key and values array) to the appended elements. Next, you can make a nested selection to add series-specific elements to the g element... ie:
var rect = series.selectAll("rect").data(function(d) { return d.values });
rect.enter().append("rect");
Note that we used a function in our ".data(...)" call. That's because the values we want passed to the join actually depend on which specific series is being processed by D3.
Now, you'd have a rect added to the g element for each value in each series. Since you used d3 to do the data binding and you used the key function in the first select (".data(data, function(d){return d.key;}"), future selects done in the same nested/keyed manner will update the right g and rect elements.
Here's a Fiddle that demonstrates the concept:
http://jsfiddle.net/reblace/bWp8L/2/
A key takeaway is that you can update the data (including adding additional series) and the whole thing will redraw correctly according to the new nested join.
I often have charts that require a design element like a curly brace to call attention to call attention to a range or comparison in a graph, such as the y-difference in two points at the end of a graph.
My first take is that this would be a job for Highcharts Renderer API. Load the graph, and run a callback that adds an image (or line, shape, whatever) via chart.renderer.image(...) or similar.
That's the approach I have started down, but I'm just missing how to get the coordinates for chart data points within the callback. Here's a working codepen of the code below. What doesn't work is that there's no logic to give it proper placement on the canvas (suppose I want the bracket to go from the final top point to the final bottom point)
$('#container').highcharts({
data: { table: document.getElementById('datatable') },
chart: { type: 'line' },
title: { text: 'Data extracted from a HTML table in the page'
}
}, function(chart){
var img = 'http://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Curly_bracket_right.svg/30px-Curly_bracket_right.svg.png';
// How can I populate these values?
var x = 0; // should programmatically get x-position of last point
var y = 0; // should programmatically get y-position of last point
var h = 100; // should programmatically get distance between y-position of top and bottom points
var w = 50;
chart.renderer.image( img, x, y, w, h ).add();
});
Is there a straightforward way to populate those values? Or is there a better way to do this entirely?
to get the position you want you can use few methods provided by highcharts in their API.
methods like toPixels(), toValue() will help you to alter your required position as per the chart demogrphics.
please refer their api
toPixels() : http://api.highcharts.com/highcharts#Axis.toPixels()
toValue() : http://api.highcharts.com/highcharts#Axis.toValue()
hope using this will solve your requirement of positioning
I'm building a page with a Google MAP that has a side bar with dynamically created divs linked to positions of markers in the map.
I'm using ASP.NET MVC with JQuery and Google Maps API v3.
Here is a look of it.
This page is loaded in a splash window and is generated dynamically.
In the background page the user types a state or city in an input field and in my controller action I search for all people that are located in that area and return a JSON.
I get the JSON and populate the map with markers and then I make the list of divs in the side bar.
I'd like to add a function to those divs that when they are clicked the map will center at the marker.
I came up with an idea for this solution which I could not finish.
I added class="clickable" and the attributes "Lat" and "Lng" with the values equal to the ones in the markers they are related to, and I tried to get their click event with JQuery and then set the map center with its Lat and Lng like this:
$(".clickable div").click(function(){
$('map_canvas').panTo($(this).attr('lat'), $(this).attr('lng'));
}
I had 2 problems with this approach.
- First, I didn't know how to get the map with JQuery.
I found 2 ways using like $('map_canvas').gMap but it didn't work. Tried a couple more things that I've found here in Stackoverflow but also didn't work.
Second - The JQuery would not catch the event click from the DIVs.
I tested on Google Chrome console the JQuery code and It worked but then my code would not trigger the click.
I tried something like $(".clickable div").click(function(){ alert("test"); } on Google Chrome and it worked, but in my script it did not.
I also tried to add listeners using addDomListener in my code but couldn't get around that either.
Could anyone please give me a light what would be a good way to do this without having to recreate the map when a div is clicked.
I also don't like the idea of adding Lat and Lng attributes to the divs, I don't know if that would work in any browser or if its good practice. I'm just out of solutions to this.
Here is the code I'm using. (I removed some of it to make it shorter and easier to read)
$(document).ready(function () {
//Google Maps API V3 - Prepares the ajaxForm options.
var options = {
beforeSubmit: showRequestPesquisaAdvogados,
success: showResponsePesquisaAdvogados,
type: 'post',
resetForm: false
};
$('#form-pesquisaAdvogado').ajaxForm(options);
//$(".clickable").click(function () { alert($(this).attr('lat')) });
});
function showRequestPesquisaAdvogados(formData, jqForm, options) {
$("#modal-processing-background").show(); //Shows processing splash window
}
function showResponsePesquisaAdvogados(responseText, statusText, xhr, $form) {
$("#modal-processing-background").hide();
//Hide processing window
loadSplashWindow();
CreateMap(responseText);
CreateSideBar(responseText);
}
}
function CreateMap(json) {
var mapOptions = {
center: new google.maps.LatLng(json[0].Endereco.Lat, json[0].Endereco.Lng),
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP
// marker:true
};
var infoWindow = new google.maps.InfoWindow();
var map = new google.maps.Map(document.getElementById("map-result"), mapOptions);
for (i = 0; i < json.length; i++) {
var data = json[i]
var myLatlng = new google.maps.LatLng(data.Endereco.Lat, data.Endereco.Lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.Endereco.Logradouro
});
(function (marker, data) {
// Attaching a click event to the current marker
google.maps.event.addListener(marker, "click", function (e) {
// Prepare the infoWindows content.
var contentString = //my content;
infoWindow.setContent(contentString);
infoWindow.open(map, marker);
});
//here I tried to add the listener to the div.
google.maps.event.addDomListener($(".clickable")[i], 'click',
function () {
map.panTo(new google.maps.LatLng($(this).attr('lat'),
$(this).attr('lng')));
});
})(marker, data);
}
}
function CreateSideBar(json) {
$(".sideBarConteiner").empty();
for (i = 0; i < json.length; i++) {
var contentString =
"<div class='clickable' lat='" + data.Endereco.Lat +
"' lng='" + data.Endereco.Lng + "' >" +
//...div's content here
"</div>";
$(".sideBarConteiner").append(contentString);
}
}
If you have any suggestions to make the code better or better practices, since I have only 3 months of experience with programming I might be going in the wrong direction without knowing, so please, feel free to change something if you think it'd be a better way.
I know my post is a bit lenghty, I just wanted to make it clear.
Thank you for your support in advance.
Regards,
Cesar.
I've found a way to do this by creating a global variable in javascript and keeping the map information in order to call it again later.
To to this I just added a var "map" right at the top of the .
<script type="text/javascript">
$.ajaxSetup({ cache: false }); //Forces IE to renew the cash for ajax.
var zoom = 8;
var mapOptions, map;
And then call a method to pan to the right point.
I added the properties Lat and Lng to the div and then pass the div in the javascript function and get the attributes from it.
function CreateSideBar(json) {
$(".sideBarConteiner").empty();
for (i = 0; i < json.length; i++) {
var contentString =
"<div class='clickable' data-lat='" + data.Endereco.Lat +
"' data-lng='" + data.Endereco.Lng + "' onclick='MarkerFocus(this)'>" +
//...div's content here
"</div>";
$(".sideBarConteiner").append(contentString);
}
}
And in my function:
function MarkerFocus(obj) {
var myLatlng =
new google.maps.LatLng($(obj).attr('data-lat'), $(obj).attr('data-lng'));
map.panTo(myLatlng);
}
It worked for me. I hope it helps you too.
Thanks to all for the help and support.
Cesar