How to add a parameter to the URL?

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遇见更好的自我

My current URL is: http://something.com/mobiles.php?brand=samsung

Now when a user clicks on a minimum price filter (say 300), I want my URL to become

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9条回答

悲&欢浪女

2020-11-30 07:18

try something like this, it should consider also cases when you already have that param in url:

function addOrUpdateUrlParam(name, value)
{
  var href = window.location.href;
  var regex = new RegExp("[&\\?]" + name + "=");
  if(regex.test(href))
  {
    regex = new RegExp("([&\\?])" + name + "=\\d+");
    window.location.href = href.replace(regex, "$1" + name + "=" + value);
  }
  else
  {
    if(href.indexOf("?") > -1)
      window.location.href = href + "&" + name + "=" + value;
    else
      window.location.href = href + "?" + name + "=" + value;
  }
}

then you invoke it like in your case:

addOrUpdateUrlParam('priceMin', 300);

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花落未央

2020-11-30 07:18

<html>
<body>
..
..
..

<?php
$priceMinValue= addslashes ( $_GET['priceMin']);
if (!empty($priceMin)) {
        $link = "currentpage.php?priceMin=". $priceMinValue;
        die("<script>location.href = '".$link. "'</script>");    
}
?>
</body>
</html>

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长发绾君心

2020-11-30 07:21
```
if(location.search === "") {
    location.href = location.href + "?priceMin=300";
} else {
    location.href = location.href + "&priceMin=300";
}
```
In case location.search === "", then there is no ? part.

So add ?newpart so that it becomes .php?newpart.

Otherwise there is a ? part already.

So add &newpart so that it becomes .php?existingpart&newpart.

Thanks to hakre, you can also simply set it like:
```
location.search += "&newpart";
```
It will automatically add ? if necessary (if not apparent, it will make it ?&newpart this way, but that should not matter).
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自闭症患者

2020-11-30 07:25

use var urlString = window.location to get the url

check if the url already contains a '?' with urlString.indexOf('?'), -1 means it doesnt exist.

set window.location to redirect

this is like 101 of javascript. try some search engines!

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礼貌的吻别

2020-11-30 07:26

I rewrite the correct answer in PHP:

function addOrUpdateUrlParam($name, $value){
$href = $_SERVER['REQUEST_URI'];
$regex = '/[&\\?]' . $name . "=/";
if(preg_match($regex, $href)){
    $regex = '([&\\?])'.$name.'=\\d+';
    $link = preg_replace($regex, "$1" . $name . "=" . $value, $href);
}else{
    if(strpos($href, '?')!=false){
        $link = $href . "&" . $name . "=" . $value;
    }else{
        $link = $href . "?" . $name . "=" . $value;
    }
}
return $link;
}

I hope that help's someone...

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眼角桃花

2020-11-30 07:26

<FORM action="" method="get">
<P>
<LABEL for="brand">Brand: </LABEL>
          <INPUT type="text" id="brand"><BR>
<LABEL for="priceMin">Minimum Price: </LABEL>
          <INPUT type="text" id="priceMin"><BR>
</P>

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