CODEWITHSUNDEEP
javascriptjqueryhtmljspparameters
Musti
Musti

Reputation: 139

Getting Parameters out of Query String doesn't work...Javascript

I've got to code a webapplication for a university project. It's something like a calender using JSP, Javascript, Java, JQuery and SQL. So I've come pretty far, but i've got a Problem with my Query Strings. I am trying to give the Id of the clicked Cell on to another Page, which is supposed to look in the Database for an Entry with that id. I am Passing this Id through a QueryString, but can't get it out. I've tried everything. Every little Piece of Code, which was supposed to get the Parameters out. That's my latest try:

    var i = location.search.split('i=')[1];

to test if the parameter has been cut out, i've tried this, which isn't working...

    var x = document.getElementById("vname");
    x.setAttribute("value",i);

vname ist the id of an input field of the form on that site. Thanks for the help :) EDIT: My ID isn't just Integer it's something like this "fr21" for friday 21:00.

I've literally tried everything u recommended, but it's not working. If i use firebug on firefox it says: "ReferenceError: functionxyz is not defined" although it is... Don't know what to do.

Upvotes: 4

Views: 408

Answers (1)

ViRuSTriNiTy
ViRuSTriNiTy

Reputation: 5155

Using an approach like split('i=') is not very robust. Better use regex and filter for the specific query string value like

<script>
  var matches = location.href.match(/&?i=(\w+)&?/);

  if (matches !== null)
  {
    var id = matches[1];

    alert(id);
  }
</script>

This way you have the advantage of supporting multiple query string parameters. So when a query string like abc=d&i=123&g=h is used, the script will return 123.

Edit

/&?i=(\w+)&?/ means

/ begin regular expression

&? match optional & character

i= i=

( start capture group, to read value later with matches[1]

\w match all characters A-Z, a-z, 0-9 and _

) close capture group

&? match optional & character

/ end regular expression

Upvotes: 1

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