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How to obtain the current file path in a javascript file

Source: Internet
Author: User
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The _ FILE _ constant like PHP does not exist in javascript files for us to obtain the path of the current FILE. After research, we can use the following methods:

1. Get the current JS file path in jQuery

It is relatively simple to obtain the path of the current JS file in jQuery. You only need the following line of code.

Var _ FILE _ = $ ("script"). last (). attr ("src ");

Note: We usually place this line of code at the beginning of the file so that the file is executed immediately when it is loaded. In this way, the current file is exactly the last script in the script element on the page. We should never put this line of code

The Code is as follows: Copy code

$ (Document). ready ();
$ (Function (){});


Run in, because if you put it in these statements, the DOM object on the page has been loaded, and the current script is not necessarily the last script, resulting in incorrect paths.

2. Native javascript gets the current JS file path

In Native javascript, there are two methods to obtain the current JS file path. The first approach is the same as in jQuery:

The Code is as follows: Copy code

Var _ FILE __, scripts = document. getElementsByTagName ("script ");
_ FILE _ = scripts [scripts. length-1]. getAttribute ("src ");


The second method is to use the Exception Handling Mechanism of the browser, but this method does not support IE10 or earlier versions of IE:

The Code is as follows: Copy code

Var _ FILE __;
Try {
Throw Error ("An Error occurred while obtaining the JS path ");
} Catch (ex ){
If (ex. fileName) // Firefox
_ FILE _ = ex. fileName;
Else if (ex. stack) // Chrome or IE10
_ FILE _ = (ex. stack. match (/ats + (.*?) : D +/) | ['','']) [1];
Else if (ex. sourceURL) // Safari
_ FILE _ = ex. sourceURL;
}

When obtaining the current file path in native javascript, we recommend that you use the first method, which is compatible with all browsers. The second method is for reference only.

Now let's look at a complete instance.

The Code is as follows: Copy code

<! Doctype html>
<Html lang = "en">
<Head>
<Meta charset = "UTF-8"/>
<Meta content = "IE = 8" http-equiv = "X-UA-Compatible"/>

<Title> obtain the JS file path by situ zhengmei </title>

<Meta http-equiv = "content-type" content = "text/html; charset = UTF-8"/>
<Script src = "/javascripts/dom-1.0.js? 1270565974 "type =" text/javascript "> </script>

</Head>
<Body>
<Div> get the JS file path by situ zhengmei </div>


</Body>
</Html>

The following is the content of the JS file. Of course, the content is only discussed in this blog post:

The Code is as follows: Copy code

Dom = {};
Dom. getBasePath = function (){
Var result = ""
Try {
A = B
} Catch (e ){
If (e. fileName) {// firefox
Result = e. fileName;
} Else if (e. sourceURL) {// safari
Result = e. sourceURL;
} Else if (e. stacktrace) {// opera
Var m = e. stacktrace. match (/() ins + (.*? : // S +)/m );
If (m & m [1])
Result = m [1]
}
}
If (! Result) {// IE and chrome
Var scripts = document. getElementsByTagName ("script ");
Var reg =/dom ([.-] d) *. js (W | $)/I
For (var I = 0, n = scripts. length; I <n; I ++ ){
Var src = !! Document. querySelector? Scripts [I]. src
: Scripts [I]. getAttribute ("src", 4 );
If (src & reg. test (src )){
Result = src
Break;
}
}
}
Return result. substr (0, result. lastIndexOf ('/') + 1 );
}
Alert (dom. getBasePath (); // http: // localhost: 3000/javascripts/

Add related methods

// Obtain the full path of the current file

The Code is as follows: Copy code

<Script language = "javascript">

Alert (window. location. href );

Alert (window. location );

Alert (location. href );

Alert (parent. location. href );

Alert (top. location. href );

Alert (document. location. href );

Alert (document. URL );

</Script>

// Obtain the current directory

<Script type = "text/javascript">

// Method 1

Var str = location. href;

Var arr = str. split ("/");

Delete arr [arr. length-1];

Var dir = arr. join ("/");

Alert (dir );

 

Method for obtaining relative paths

The Code is as follows: Copy code

Function getRelativePath ()
{
Var url = location. href; // The current url
Var path = url. length-url. replace (// g, ""). length-4;

// Hierarchy is the length of the url containing/-the length of the uncontained/minus the number of project headers/(such as the http://hi.baidu.com/zdz8207)
Var str = "";
For (var I = 0; I <path; I ++)
{
Str + = "../"; // returns the result of combining the string with a relative path.
}
Return str;
}

 

// Method 2

Alert (location. href. substring (0, location. href. lastIndexOf ('/')));

</Script>

// Get the current file name

<Script language = javascript>

Var filename = location. href;

Filename = filename. substr (filename. lastIndexOf ('/') + 1 );

Alert (filename );

</Script>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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