JavaScript - Save ArrayList to variable in format manner

Question

I am trying to create an arraylist with three dates. I then want to save the arraylist into variable in a formatted way. However, when I try to document.write the variable, the elements are completely different.

<script>
<% List<String> strList = new ArrayList<String>();
strList.add("23-2-2016");
strList.add("24-2-2016");
strList.add("25-2-2016"); %>


var unavailableDates = [<% for (int i = 0; i < strList.size(); i++) { %><%= strList.get(i) %><%= i + 1 < strList.size() ? ",":"" %><% } %>];

document.write(unavailableDates);
</script>

The result I want is "23-2-2016", "24-2-2016", "25-2-2016".

However, I am getting this displayed: -1995,-1994,-1993

@NinaScholz The OP is generating javascript from a JSP, the dates are bing evaluated as expressions. — Peter Lawrey
– Peter Lawrey, Commented Feb 20, 2016 at 17:43

BackSlash · Accepted Answer · 2016-02-20 17:43:10Z

1

You need to use string literals when printing javascript, otherwise your dates will be treated as arithmetic expressions (23 - 2 - 2016 = -1995).

var unavailableDates = [
    <% for (int i = 0; i < strList.size(); i++) { %>
        '<%= strList.get(i) %>'
    //  ^                     ^
        <%= i + 1 < strList.size() ? ",":"" %>
    <% } %>
];

answered Feb 20, 2016 at 17:43

BackSlash

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7 Comments

abcdefg Over a year ago

I've tried this before but getting an error with everything between the two ' '. Error = Syntax error on token "'$tag_________________$tag__________________________________$tag_'", delete this token

abcdefg Over a year ago

Another error. "Syntax error on tokens, delete these tokens." It is pointing to every single quote.

BackSlash Over a year ago

@abcdefg Is it your IDE? if it is your IDE, just try to execute the JSP and see the output, for example eclipse's JSP editor is crap and sees errors everywhere

abcdefg Over a year ago

hahaha. You're right. I am using Eclipse but when I run, it displays. However, can I somehow add double quotes between each date. E.g. "23-2-2016", ...

BackSlash Over a year ago

@abcdefg Absolutely! Just change the single quotes to double quotes, it will work!

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