[GIS] Map Application Requires Refresh to Initialize

arcgis-javascript-apiarcgis-server

I tried this question over on StackOverflow but didn't get any answers. Hoping you all might be able to help.

Creating a web mapping application in Javascript/Dojo:

When I load the app in a browser it loads the html elements but then stops processing. I have to refresh the browser to get it to load the rest of the page and the javascript.

I have done testing and debugging all day and figured out I had my external JS files in the wrong spot (I'm a rookie). Fixed that and the app loads great…EXCEPT one of my files isn't getting read correctly, or at all.

When I move the contents of the external JS file in question to the main code in the default, the functionality that they contain, work fine… BUT the map requires the refresh again.

Stumped. Below is the code in the external JS file that is causing my issue. I can't figure out why it is a problem because the functions work as expected when it is not external.

Any help is greatly appreciated.

//Toggles
function basemapToggle() {
            basemaptoggler = new dojo.fx.Toggler({
                node: "basemaptoggle",
                showFunc : dojo.fx.wipeIn,
                showDuration: 1000,
                hideDuration: 1000,
                hideFunc : dojo.fx.wipeOut
            })
        }
        dojo.addOnLoad(basemapToggle);

        function layerToggle() {
            layertoggler = new dojo.fx.Toggler({
                node: "layertoggle",
                showFunc : dojo.fx.wipeIn,
                showDuration: 750,
                hideDuration: 750,
                hideFunc : dojo.fx.wipeOut
            })
        }
        dojo.addOnLoad(layerToggle);

        function legendToggle() {
            legendtoggler = new dojo.fx.Toggler({
                node: "legendtoggle",
                showFunc : dojo.fx.wipeIn,
                hideFunc : dojo.fx.wipeOut
            })
        }
        dojo.addOnLoad(legendToggle);

Here is the front part of my code

<!DOCTYPE HTML> 
  <html>  
  <head> 
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=7, IE=8, IE=9" />
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no"/>
    <title> 
        Zoning Classifications
    </title> 
        <link rel="Stylesheet" href="ZoningClassifications.css" />
    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/dojo/dijit/themes/claro/claro.css">
        <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/esri/dijit/css/Popup.css">
        <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/dojo/dojox/grid/resources/Grid.css">
    <link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/3.0/js/dojo/dojox/grid/resources/claroGrid.css">
    <style type="text/css"> 
    </style> 

        <script src="JS/layers.js"></script>
        <script src="JS/search.js"></script>
        <script src="JS/basemapgallery.js"></script>

        <script src="JS/identify.js"></script>
        <script src="JS/toggles.js"></script>
        <script type="text/javascript"> 
      var djConfig = {
        parseOnLoad: true
      };
    </script> 
    <script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=3.0"></script>
    <script type="text/javascript"> 

            dojo.require("dijit.dijit"); // optimize: load dijit layer
      dojo.require("dijit.layout.BorderContainer");
      dojo.require("dijit.layout.ContentPane");
      dojo.require("esri.map");
      dojo.require("dijit.TitlePane");
      dojo.require("esri.dijit.BasemapGallery");
      dojo.require("esri.arcgis.utils");
            dojo.require("esri.tasks.locator");
            dojo.require("esri.dijit.Legend");
            dojo.require("esri.dijit.Popup");
            dojo.require("dijit.form.Button");
            dojo.require("dojo.fx");
            dojo.require("dijit.Dialog");
            dojo.require("dojo.ready");
      dojo.require("dijit.TooltipDialog");
            dojo.require("dojox.grid.DataGrid");
      dojo.require("dojo.data.ItemFileReadStore");
      dojo.require("esri.tasks.find");

EDIT 2
I've completely rewritten the app placing all the code (except the css) in the main default.html file. I tested piece by piece to make sure it functioned how I want. Adding the toggles code is the only code that throws it and causes the extra refresh.

So for now I am using dijit.TitlePane to hold the drop down elements (basemap gallery, layers, legend). However with this you can not change the look and feel to make them images, which is my end goal.

Can anybody suggest an alternative so I can use 3 different images so that when you click on the image and drop down menu opens holding the basemap gallery, layer list and legend?

Best Answer

I would consolidate all of those dojo.addOnLoad() calls. I suspect something isn't getting loaded before a function is getting called.

Strip all dojo.addOnLoad calls from all of your external javascript files and bundle them into one call in your main HTML file. Put all the functions you want to fire on load into a new function at the bottom of your javascript like this:

function init() {
  basemapToggle();
  layerToggle();
  whatEver();
}
dojo.addOnLoad(init);

This will ensure that everything has loaded before trying to fire off any functions.

Related Question