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How to check if a URL contains a hash using JavaScript?
- 王林forward
- 2023-09-07 14:57:111056browse
Overview
Use JavaScript to check if the Uniform Resource Locator (U.R.L.) contains a hash value (#text), as JavaScript includes some pre-built methods that make getting a specific target a simple task. This can be done by using the hash property in JavaScript, which can be accessed by initializing the window.location object. It simplifies the user interface and provides all-important web navigation.
To build this solution we need prior knowledge of the following topics -
HTML- Builds the skeleton of the page. Where we will use the internal 7239f9c7b7d151b366b41e07a1e7636c tag.
HTML events (onclick(), onchange(), etc.)
JavaScript window object, position object, hash attribute.
grammar
The basic syntax used by this program is -
window.location.hash
Window - This is a JavaScript object that specifies the web browser frame. It handles methods specific to your browser. The properties of windows can be accessed through
grammar:
(window.property/methodName)
Location - It is a property of the window object that contains information about the current web page URL.
grammar:
window.location.propertyName
Hash - It is a property of the position object containing the text after #. If the URL contains "/tutorialspoint/#java". Then location.hash will return the value "java".
algorithm
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Step 1 - Create an HTML button using the bb9345e55eb71822850ff156dfde57c8
tag -
Step 2- Insert the onclick event in the button label 3b0c972ff6cb77ed3535e06ec1321ba5 and insert the function in it , such as 4626f3e1ab2a856a463d5a673373b42e. Function names are user-defined so you can change them as per your convenience.
-
Step 3 - Create JavaScript arrow function checkHash().
-
Step 4 - Use the windowobject method location and the location method hash. Store the result of window.location.hash in a variable.
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Step 5- Pass variables as conditions in if-else.
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Step 6- If the variable passed in if-else is true, return "Hash found", otherwise if the variable passed is false, return "Hash not found" .
In the given code, it contains an HTML button which contains "onclick()" event handler which gives JavaScript user defined function "checkHash()". When bb9345e55eb71822850ff156dfde57c8 is clicked, the checkHash() function is triggered.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Check the Hash in URL</title>
<style>
body{
border: 1px solid black;
text-align: center;
}
</style>
</head>
<body>
<p>
<strong> OUTPUT HASH- </strong>
<span id="outputVal" style="padding:3px;"> </span>// Output will be shown here
</p>
<button onclick="checkHash()">Check URL Hash</button><br>
<a href="#java">add hash(#) to url</a><br>
<!-- JavaScript function starts from here -->
<script>
checkHash=()=>{
var h = window.location.hash;
if(window.location.hash){
document.getElementById("outputVal").innerText="Hash found "+h;
document.getElementById("outputVal").style.background="lightgreen";
} else {
document.getElementById("outputVal").innerText="No Hash Found";
document.getElementById("outputVal").style.background="tomato";
}
}
</script>
<!-- JavaScript function ends here -->
</body>
</html>
After clicking on the anchor text -
In this state, the URL of the web page (http://127.0.0.1:3000/index.html) does not contain any #text, as shown in the address bar below, so window.location .hash will not be referenced to store anything in the variable, so it returns false and prints "Hash value not found."After clicking the anchor text, the value of the HTML attribute href="#java" is concatenated with the current URL, so window.location.hash contains the concatenated hash text "#java", so the name of the hash that returns true is stored in in variable "h" and "h" variable will be checked in if-else condition and its output will be displayed inside "outputVal" id container.
in conclusion
When the anchor link is clicked, it will redirect us to the hash content.
This provides the user with an interactive interface with directions to the hashed linked content. Location objects also have many beneficial properties, such as href, origin, pathname, and more. The Window object also provides various methods for operating the browser, such as location, history, open(), close(), etc.
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