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Getting value GET OR POST variable using JavaScript?

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一个人的身影
一个人的身影 2020-11-27 05:59

How to get value of the get or post variable on page load using JavaScript?

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  • 情歌与酒
    2020-11-27 06:48

    You can't get the value of POST variables using Javascript, although you can insert it in the document when you process the request on the server.

    <script type="text/javascript">
    window.some_variable = '<?=$_POST['some_value']?>'; // That's for a string
</script>

    GET variables are available through the window.location.href, and some frameworks even have methods ready to parse them.

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  • 忘了有多久
    2020-11-27 06:50

    Here is my answer for this given a string returnURL which is like http://host.com/?param1=abc&param2=cde. It's fairly basic as I'm beginning at JavaScript (this is actually part of my first program ever in JS), and making it simpler to understand rather than tricky.

    Notes

    • No sanity checking of values
    • Just outputting to the console - you'll want to store them in an array or something

    • this is only for GET, and not POST

      var paramindex = returnURL.indexOf('?');
if (paramindex > 0) {
    var paramstring = returnURL.split('?')[1];
    while (paramindex > 0) {
        paramindex = paramstring.indexOf('=');
        if (paramindex > 0) {
            var parkey = paramstring.substr(0,paramindex);
            console.log(parkey)
            paramstring = paramstring.substr(paramindex+1) // +1 to strip out the =
        }
        paramindex = paramstring.indexOf('&');
        if (paramindex > 0) {
            var parvalue = paramstring.substr(0,paramindex);
            console.log(parvalue)
            paramstring = paramstring.substr(paramindex+1) // +1 to strip out the &
        } else { // we're at the end of the URL
            var parvalue = paramstring
            console.log(parvalue)
            break;
        }
    }
}
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  • 心在旅途
    2020-11-27 06:55

    When i had the issue i saved the value into a hidden input:

    in html body:

        <body>
    <?php 
    if (isset($_POST['Id'])){
      $fid= $_POST['Id']; 
    }
    ?>

    ... then put the hidden input on the page and write the value $fid with php echo

        <input type=hidden id ="fid" name=fid value="<?php echo $fid ?>">

    then in $(document).ready( function () {

        var postId=document.getElementById("fid").value;

    so i got my hidden url parameter in php an js.

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