I know how this works in C#, however not so much in javascript so I am hoping it is similar.
With Javascript can I create say a master.js, with a variable (var defaultValue = "1234"), which I can reference in all other javascript files associated with the project?
so in terms of Lightswitch HTML, each screen has the ability to have a js file, and on the screen I want to be able to retrieve this defaultValue.
so far I have created a main.js file, added this function:
function getDefaultValue(value) {
var value = "1234";
return value;
}
and declared the js file in the default.htm file:
<script type="text/javascript" src="Scripts/main.js"></script>
I know this is how i am using other JavaScript files like blob.js, lsWires.js etc...
using this method in by screen.js doesn't work so one of these stages is causing an error...
window.alert(main.getDefaultValue(value));
ideally i would like to use this defaultvalue for setting a value, i.e. var test = main.getDefaultValue(value)
This is certainly possible, and the script declaration you've used in your default.htm appears correct.
However, as the approach you've described creates a global getDefaultValue function (added to the global window object context) you wouldn't specify a main 'namespace' prefix like you would in c#.
Instead, rather than calling the function using main.getDefaultValue, you'd use the the following approach within your LightSwitch screens:
myapp.BrowseProducts.created = function (screen) {
window.alert(window.getDefaultValue("123")); // This will display 1234
// As window is a global object, its window prefix can be omitted e.g.
alert(getDefaultValue("123")); // This will display 1234
};
Or, if you want to define a global defaultValue variable in your main.js (probably the approach you're looking to implement) you would have the following code in your main.js file:
var defaultValue = "5678";
Then you'd access it as follows in your LightSwitch screens:
myapp.BrowseProducts.created = function (screen) {
alert(defaultValue); // This will display 5678
defaultValue = "Hello World";
alert(defaultValue); // This will now display Hello World
};
Also, if you'd like to organise your functions/properties in a main 'namespace', you could use the following type of approach in your main.js file: -
var main = (function (ns) {
ns.getDefaultValue = function (value) {
var value = "1234";
return value;
};
ns.defaultValue = "5678";
return ns;
})(main || {});
These would then be called as follows in your LightSwitch screens: -
myapp.BrowseProducts.created = function (screen) {
alert(main.getDefaultValue("123")); // This will display 1234
alert(main.defaultValue); // This will display 5678
main.defaultValue = "Hello World";
alert(main.defaultValue); // This will now display Hello World
};
This type of approach is covered in the following posts: -