CODEWITHSUNDEEP
javascriptgetvariable-assignment
Mathias Maes
Mathias Maes

Reputation: 501

Get request fails in javascript

I'm trying to call another page with javascript, but I can't imagine what is wrong. This is what I wrote:

function updatesomething(id) {
   var xmlHttp = null;
   var theUrl = "";
   xmlHttp = new XMLHttpRequest();
   alert('works');
   theUrl = 'testpage.php?id=' + id + '&hoeveelheid=' + document.getElementById("hoeveelheid_textfield").value;
   alert(theUrl);
   xmlHttp.open("GET", theUrl, false);
   xmlHttp.send(null);
}

The first alert that shows 'works', is actually working. The second alert never shows up. But I don't know what would be wrong with assignment of 'theUrl'.

Thanks

Upvotes: 0

Views: 73

Answers (1)

EduardoFernandes
EduardoFernandes

Reputation: 3449

The line theUrl = 'testpage.php?id=' + id + '&hoeveelheid=' + document.getElementById("hoeveelheid_textfield").value; has something which is null and is causing problems. Check whether id or document.getElementById("hoeveelheid_textfield") is null. Probably the latter is null and when you try to access the value property the code breaks.

Upvotes: 3

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