How get script by pass pamater in script? [duplicate] - javascript

This question already has answers here:
How can I get query string values in JavaScript?
(73 answers)
Closed 7 years ago.
In html page, I'm include js
<script src="/script/lib.js?file=bootstrap,jquery"></script>
And in lib.js, I can include like this:
if(file=="jquery"){
$.getScript("//cdn.optimizely.com/js/jquery.js");
}
if(file=="ecomotion"){
$.getScript("//cdn.jsdelivr.net/emojione/1.3.0/lib/js/emojione.min.js");
}
if(file=="bootstrap"){
$.getScript("//maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js");
}
ect
How can we do that?

You can't pass parameters to JavaScript files, like that.
You could, however, do this:
<script>
window.file = ['bootstrap', 'jquery'];
</script>
<script src="/script/lib.js"></script>
In your script:
if(window.file.indexOf("bootstrap") !== -1){
// Same for the other file types.
The disadvantage here is that you're creating a global variable, which is arguably a bad idea.
The advantage is that you can easily specify a list of files to include, while working around the fact that it's impossible to pass query strings to a JS file.

OPTION 1
The only way that you can really do this like you have written is if lib.js was interpreted on the server side. For instance in PHP (or Node, or .Net) you could then read the GET and spit out the appropriate $.getScript blocks as output.
Pros are that it'll work without any weird hacks. You could even work to make the file cache-able.
A simple .htaccess mod-rewrite can direct calls to libs.js to a PHP script.
OPTION 2
Another option would be to expose a function from libs.js that would initialise the includes:
libs.js
function getMyScripts(scripts){
/* loop through the `scripts` array and spit out
the `$.getScript` calls */
}
You page would then do this:
<script src="libs.js"></script>
<script>
getMyScripts(['lib1', 'lib2']);
</script>

Related

How to place other JavaScript file links in a Javascript? [duplicate]

This question already has answers here:
How do I include a JavaScript file in another JavaScript file?
(70 answers)
Closed 6 years ago.
I have a bunch of JavaScript links at the bottom of one of my HTML template. I want to create a separate JavaScript file that will only contain all the source links in it.
So instead of cluttering my template footer I want all the links in one JavaScript file. How can I achieve that?
What I'm really asking is how I can get a similar effect as the CSS #import functionality for JavaScript.
And if that is not possible can I place a block of HTML at the footer of my template from a different HTML file?
You could do this with ajax but an easy way is to just append them with jquery
$('.div').append('<script src="myscript.js"></script>');
hope that helps
You can create a seperate js file and a object in it. This object can have multiple keys and their value will these links. Return this object from the file
Hope this snippet will be useful
linkFile.js
var AllLinks = function(){
var _links ={};
_links.keyOne ="link1";
_links.keyTwo ="link2";
return {
links:_links
}
}
Also include this file using script tag
In other file you can retrieve this value as
AllLinks.links.keyOne & so on
Have an array that holds the link to your script files and then you have two options either to use $.getScript() to load each one Or by building an HTML out of it and appending it to your head or body tag. I prefer head tag to keep all the scripts and css files.
Your array of script files
var JsFiles = ["script1.js","script2.js","script3.js","script4.js"];
First approach using $.getScript()
JsFiles.each(function(i,v){
$.getScript(JsFiles[i], function( data, textStatus, jqxhr){
console.log( textStatus ); // Success
});
});
Disadvantage of the above approach is that the getScript makes a async calls to your script files that means if the script2.js is dependent on the script1.js (for example if script1.js is some plugin file which use initialize in script2.js) Then you will face issues.
To overcome you might have to then use Promises or write a callback on each getScript success function which will trigger next script load and so on..
If the order of the script loading is not important then above approach is good to go.
Second approach by building HTML
var scriptTags ="";
JsFiles.each(function(i,v){
scriptTags += "<script src='"+ JsFiles[i] +"'></script>";
});
$('head').append(scriptTags);
Good thing about this approach is that the script files will now load synchronously and you will not face the dependency problem. But make sure the independent files start from first and the dependent files come at last.

PHP logic to Javascript front into html tags

I am currently trying to convert a lot of backend code to front end (to lighten the load on a small system).
The code at the moment calls a PHP function to return specific information. (e.g. image locations, strings, styling)
I am converting this code to its js equivalent, the content from Mysql was converted to JSON and stored in a read only file and I am accessing that file using this code:
<script>
function jsread(tag) {
$.getJSON("/strings.json", function(result){
document.write(result[tag]['value']);
});
}
</script>
I want the function to "print" where ever it is invoked. document write writes the value to the page but stops all other loading and write only the value.
Let me be very clear on this: I DO NOT want to use anything that needs extra calls or references out side of this function, that will take months of work so no getting elements by their IDs I have already view many questions on this subject and none are what I can work with. I need something that can be applied to every situation. Other wise I will just have to read the JSON using PHP as a middle compromise.
The problem here is, document.write()'s behaviour is crazy across all the browsers, because, it directly modifies the document object and messes up with the events attached. So it is always better to avoid this function as each browser defines it differently and has a different effect on the same code, with different browsers.
Is there a way to use them without a direct reference?
Solution
The wise thing is, as I said in the comments, it is better to use one of the jQuery functions safely, which create a textNode and insert it the right way, without affecting the others:
<script>
function jsread(tag) {
$.getJSON("/strings.json", function(result){
$("body").append(result[tag]['value']);
});
}
</script>
In case, if you wanna do something like having a placeholder and doing stuff, then you can try giving something like this:
$(function () {
var data = "Dummy Data, that would probably get returned from the getJSON";
// Inside the Success function, do this:
$("span.placeholder-of-the-json").replaceWith(data);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span class="placeholder-of-the-json">This gets replaced</span>

Insert JavaScript data chunk (JSON) into an HTML page

I need to include a JavaScript object (JSON) in my HTML page.
JSON is rendered at the same time page HTML is rendered on server. Data is not retrieved using AJAX call.
I can think of two ways of doing this, and looking for feedback and recommendations.
What are good practices for passing JavaScript (JSON) blob with a page?
Option 1
HTML:
<script type='text/javascript'>
var model = { <JSON> };
</script>
.js:
function doSomething() { <use this.model here> }
Option 2
HTML:
<script type='text/javascript'>
loadModel({<JSON>});
</script>
.js (included at the top of the html file):
var model = null;
function loadModel(model) { this.model = model; }
function doSomething() { <use this.model here> }
Variation
Instead of including JSON in HTML, JSON can be stored in a separate .js file. Any comments on doing so?
Option 1 lets you include .js file anywhere, and including it at the bottom of the page makes it render faster (good thing), but since JavaScript renders the model on the page, this makes it a moot point. Still not depending on the location of the .js inclusion makes it less error prone.
Also R# complains (reasonably) about model being uninitialized.
Option 2 feels better (it encapsulate details better, for one), but .js must be included before call to loadModel.
I have seen and done both ways, but didn't notice any significant advantages of one way over the other.
Server platform should be irrelevant, but it is IIS 7.5/ASP.NET MVC 3/Razor
Forget your two suggestions - both are extremely vulnerable to XSS. NEVER PUT UNTRUSTED TEXT IN A SCRIPT TAG.
Instead, use the owasp recommendation.
Stick your (HTML encoded) JSON in the DOM like so:
<div id="init_data" hidden>
<%= html_escape(data.to_json) %>
</div>
Then read it in JavaScript like so:
// external js file
var dataElement = document.getElementById('init_data');
// decode and parse the content of the div
var initData = JSON.parse(dataElement.textContent);
There would be ever so slightly more overhead with option two. As you have the overhead of a function call, and an extra variable (your parameter), which will be allocated and deallocated.
As you said, there is little advantage/disadvantage to either way.
Can you use jQuery? Then you can use the DOM ready event instead of including javascript in your HTML.
EDIT:
Hmm, in that case you could include the JSON inside a hidden element when the page is generated. Then inside the DOM ready event you could read and parse it from the page using jQuery.
Another alternative might be to use HTML 5 data attributes and including the data in one of those.
If it were me I'd probably just use an ajax call since it is easier and seems a little cleaner.

How to get texts from Resx to be used in Javascript?

We are building large ASP.NET applications for the intranet use in multiple languages/cultures. We utilize the Globalization with RESX files and use GetResourceText on the server side to get the localized texts.
Lately we are doing more and more client side logic with JQuery.
How do I get the RESX texts to be used in Javascript?
e.g. texts used for validation, dynamic messages etc.
All our Javascripts are in .JS files, we do not want to mix HTML in the ASPX page and Javascript blocks.
Thanks for your help.
Unfortunately, in an external JS file the server side code is not being processed by the server. However I have seen a workaround where you can set your translated values in hidden fields on the page - this way your javascript will be able to read the values in.
For example:
<%-- This goes into your page --%>
<input type="hidden" id="translatedField" name="translatedField" value="<%=Resources.Resources.translatedText %>" />
and use this inside your javascript file:
// This is the js file
$(document).ready(function() {
alert($("#translatedField").attr("value"));
});
You will be able to separate the values and still see it in your external JS file.
There is also another workaround that creates a .aspx file that only outputs Javascript instead of HTML. Check out the link below:
Using server side method in an external JavaScript file
Always separate functionality from human readable strings.
If you're creating jQuery-plugins you should be able to pass an array of localized strings as parameter when you call your different jQuery functions. The array could be defined as inline javascript directly on the page calling the different jQuery plugins or you could load the from external resource in the format /scripts/localization/strings.js?ci=en-US and register a Generic ASP.Net Handler in web.config that would respond to scripts/localization/strings.js
The DatePicker control is a fine example of how to localize text for the jQuery datepick control - this js file is dynamically created from resource files (resx) and when included on a page it will make sure the calendar control will have danish text.
Create a HttpHandler (.ashx file), and return JSON with your text resource strings.
You may also "publish" it to global namespace, i.e.
Response.Write("window.Resources=");
Response.Write((new JavaScriptSerializer()).Serialize(strings));
set up HTML like:
<script src="Resx.ashx?lang=en-US" />
<button class="LogoutButtonResourceId OtherButtonClasses">(generic logout text)</button>
<a href="#"><span class="SomeLinkTextResourceId OtherClasses">
(generic link text)
</span></a>
and apply texts like this:
$(document).ready(function() {
for(var resId in Resources){
$("."+resId).html(Resources[resId]);
}
});
If you don't want to use ASP.NET to generate your main JavaScript, here are two other options:
Use ASP.NET to generate a script file that contains variable-to-string assignments, such as var mystring = 'my value';. Your main script would then reference the localized text with variables names rather than as embedded values. If that's still too "dirty" for you, you could encode the strings as JSON rather than as variable assignments, using an HttpHandler rather than straight .aspx.
Have your JavaScript code issue an Ajax call to retrieve an array or list of localized strings from the server. The server-side part of the call would retrieve the text from your resx files.
Have you considered using $.ajax in combination with ASP.NET WebMethods? It's hard to suggest a more concrete solution to this problem without understanding how your JavaScript/jQuery would consume/process the resources. I assume that they're organized into logical groups (or could be) where you could return several resource strings that belong on a single page.
Assuming that, you could write a very simple C# class -- or use a Dictionary<string, string> -- to return data from your ASP.NET WebMethod. The results would look something like:
[WebMethod]
public Dictionary<string, string> GetPageResources(string currentPage)
{
// ... Organizational stuff goes here.
}
I always separate out my AJAX calls into separate .js files/objects; that would look like:
function GetPageResources (page, callback)
$.ajax({ // Setup the AJAX call to your WebMethod
data: "{ 'currentPage':'" + page + "' }",
url: /Ajax/Resources.asmx/GetPageResources, // Or similar.
success: function (result) { // To be replaced with .done in jQuery 1.8
callback(result.d);
}
});
Then, in the .js executed on the page, you should be able to consume that data like:
// Whatever first executes when you load a page and its JS files
// -- I assume that you aren't using something like $(document).ready(function () {});
GetPageResources(document.location, SetPageResources);
function SetPageResources(resources) {
for (currentResource in resources) {
$("#" + currentResource.Key).html(currentResource.Value);
}
}
I know it's to late but want share my experience in this task)
I use AjaxMin. It can insert resx key values into js file on build event.
It's not common way but it keeps html without unneeded script blocks and can be done during minification process if you have it.
It works like this:
ajaxmin.exe test.js -RES:Strings resource.resx -o test.min.js
Also you need to do the same for ech locale if you have many.
Syntax to write resource keys in js (and also css) is written here:
Js localization
Css localization
How about injecting it as part of a javascript control initialization? what i do is as follows:
I have a self-contained javascript control - call it CRMControl, which has an init method called setupCRMControl, to which i pass a settings object. When i initialize it, i pass an object containing all the resources i need inside javascript as follows:
CRMControl.setupCRMControl({
numOfCRMs: 3,
maxNumOfItems: 10,
// then i pass a resources object with the strings i need inside
Resources: {
Cancel: '#Resources.Cancel',
Done: '#Resources.Done',
Title: '#Resources.Title'
}
});
Then, inside this javascript control:
var crmSettings = {};
this.setupCRMControl(settings) {
crmSettings = settings;
};
and whenever i want to show a resource, i say (for example, show an alert saying 'Done'):
alert(crmSettings.Resources.Done);
You can call it "R" to make it shorter or something, but this is my approach. Maybe this may not work if you have a whole bunch of strings, but for manageable cases, this may work.

Passing Querystring style parameters into Javascript file

Not sure if this is possible or even if I should do it, but I think it's quite interesting.
I have a javascript file which I'm referencing in a flat HTML page. I'd like to pass in a parameter or two via the path to the script. Like this;
<script src="/scripts/myJavascriptFile.js?config1=true" type="text/javascript"></script>
Not really sure if it can work but it would make my solution a little easier for others to take my script and implement (arguable).
Cheers,
Mike
I don't think that passing in variables via the src attribute is possible out of the box without some extra coding on your part (there is an article here if you are interested!). You could do the following though, which should provide the same functionality as you are looking for:
Define your "config" variables in a single script block on your HTML page:
<script type="text/javascript">
var config1 = true;
</script>
Reference your external JS file in a second script block:
<script src="/scripts/myJavascriptFile.js" type="text/javascript"></script>
Add this code to your external JS file to reference the "local" variable in your HTML:
var conf1 = window.config1;
if (conf1) {
// Do stuff
}
This is a variation on Matt's answer. I have a similar case where I need a jQuery file to use a value that is generated in the HTML (by Razor in this case). I write the value to a meta tag, generated as it is from the controller:
<meta name="sessionId" content="#ViewBag.SessionId">
and then read it in the jQuery file:
var sessionId = $("meta[name=sessionId]").attr("content");
It's not quite the same as passing it in by querystring, but useful if that information is considered "meta-information" of the HTML page.

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