Imagine having a website
http://example.com/page.html
Is there a method to create a link to that page which, for instance, changes the color of all <b> sections to red?
I suppose I would need some code in page.html and a URL like this:
http://example.com/page.html?style="b{color:red;}"Is it actually possible and if yes, what is the standard way to achieve it?
To retrieve information from the query string, use location.search and implement necessary logic for processing the data.
It is crucial to protect against potential XSS vulnerabilities when working with query strings.
Have you ever considered experimenting with CSS?
Within the example.css document:
br
{
color:red;
}
One way to easily and abstractly append styles directly to the head is by using a script on window load. However, it is crucial to parse and verify the format of the appended style to prevent any security attacks. By adding styles in this manner, you are essentially granting every web user access to manipulate your stylesheet directly from the head section.
window.onload = function() {
if(document.location.search.indexOf('style=')>-1) {
var style = decodeURI(document.location.search.substring(document.location.search.indexOf('style=') + 6));
if(style.indexOf(',')>-1) { style = style.substring(0,style.indexOf(',')); }
var elem = document.createElement('style');
elem.type='text/css';
elem.innerHTML = style;
document.head.appendChild(elem);
}
};
Another approach is to add style modifications through the URI parameter like
?style=body{background-color:blue;}%20b{color:red;}When it comes to Javascript customization, the possibilities are endless. There is no one-size-fits-all solution for achieving your desired outcome.
One approach could be utilizing document.location.hash to extract a value and apply a specific style to b elements. Parsing query strings may pose a greater challenge as JavaScript does not inherently support this feature.
If you want to change the style of specific elements on a web page, one way to do it is by adding a click handler to a link element.
Here's an example of how you can achieve this:
document.getElementById('clickme').onclick = function(){
var italicTags = document.body.getElementsByTagName("i");
for(var j = 0; j < italicTags.length; j++){
italicTags[j].style.color = 'blue';
}
}
Check out the live demo here: http://example.com/demo
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