Replace the contents of a div with regex match of string
Question
I'm trying to figure out how to replace the contents of a <div> with the results from a regex .match() statement on a string. This is the code I have so far but I can't get it to work. I want the button to stay on screen but the <div> to reflect the matched word.
<html>
<body>
<script type="text/javascript">
function search(){
var str = "Visit W3Schools";
var patt1 = /w3schools/i;
document.write(str.replace(document.getElementById("results"),
(str.match(patt1))));
}
</script>
</body>
<div id="results">So this is some text.</div>
<button name="Search" onclick="search()">Click Here</button>
</html>
Any ideas as to why it's not working?
3 answers
solution1
2 ACCPTED 2011-09-10 00:18:50
You need to stop the button completing it's default event, which is to submit the page. (Edit: No it's not, its default event is nothing - assumed it was a <submit> :) )
In addition, to get a div from the document basic on it's id attribute, you use document.getElementById('id-of-element') and to set the contents of a div, you use .innerHTML on the element we just got.
// We need to take the event handler as a parameter for the function, let's call it e
function search(e){
var str = "Visit W3Schools";
var patt1 = /w3schools/i;
document.getElementById("results").innerHTML = str.match(patt1)[0];
// This line stops the default action occurring
e.preventDefault();
}
Note: we don't need to specify an argument here, e goes in automatically
<button name="Search" onclick="search()">Click Here</button>
solution2
1 2011-09-10 00:19:11
document.write will replace the entire page with the passed in parameter. So you just want to update that single DIV, results . So you want to use innerHTML :
function search() {
var str = "Visit W3Schools";
var patt1 = /w3schools/i;
document.getElementById("results").innerHTML = str.match(patt1)[0];
}
solution3
1 2011-09-10 00:27:38
Your code is searching for the String "So this is come text." in the String "Visit W3Schools" and replacing it with the array ["W3Schools"] , then writing it to the screen. This doesn't make much sense.
Try something like this instead:
function search(){
var str = "Visit W3Schools";
var patt1=/w3schools/i;
document.getElementById("results").innerHTML=(str.match(patt1))[0];
}
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