How to find substring in javascript if index is unknown?

Question

Suppose I have a string which contains an HTML file. How do I get the script part only as my sub string?

The example string is :

str="<html>...<script>...</script>...</html>"

I only need the script part.

<script type = "text/javascript">
function Showques()
{
    var xmlhttp;
    if (window.XMLHttpRequest)
    {
        xmlhttp=new XMLHttpRequest();
    } 
    else 
    {
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    //getting response from servlet
    xmlhttp.onreadystatechange=function();
    {
        if (xmlhttp.readyState==4 && xmlhttp.status==200) 
        {
            var localString=xmlhttp.responseText;
            var locationstart =localString.indexOf('<script>');
            var locationend = localString.indexOf('</script>');
            //eval(xmlhttp.responseText);
            document.getElementById("ques").innerHTML=xmlhttp.responseText;
        }
    }
    xmlhttp.open("POST","XmlApp",true);
    xmlhttp.send();
}
</script>

When I give </script> within indexOf method it's considering as the end of my script which i declared in the beginning and rest of things I am getting error.

Gerald P. Wright · Accepted Answer · 2012-01-02 06:55:59Z

2

Use

string.indexOf(searchstring, start)

to find the proper index in the string. You can then use the index in your substr function.

Hope this helps.

answered Jan 2, 2012 at 6:55

Gerald P. Wright

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1 Comment

Harini Over a year ago

my string looks like this: str="<html>...<script>...</script>...</html>, i need the script part alone.

gion_13 · Accepted Answer · 2012-01-02 09:29:23Z

1

you should probably better use a dom parser if your string is an actual html file.
If you are working with javascript, here is a simple jQuery way to do it :

str="<html>...<script>...</script>...</html>";
$(str).find("script").get(0).outerHtml;

answered Jan 2, 2012 at 9:29

gion_13

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Comments

PresleyDias · Accepted Answer · 2012-01-02 09:08:28Z

0

try this from aNd This

 String str = "yourStringTosearch"
 int location = str.indexOf('String');
 string.substring(location , to)

Ok according to ur example do this

 String str = "<html>...<script>...</script>...</html>"
 int locationStart = str.indexOf('<script>');
 int locationend = str.indexOf('</script>');
 strinf finalString =string.substring(locationStart , locationend );   //ur final string value

edited Jan 2, 2012 at 9:08

answered Jan 2, 2012 at 7:00

PresleyDias

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3 Comments

Harini Over a year ago

my string looks like this: str="<html>...<script>...</script>...</html>, i need the script part alone.

Harini Over a year ago

PresleyDias Over a year ago

@user1101422 : this was the output ? <script type = "text/javascript">

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