How to pass array from java to javascript

Question

I want to pass a String Array From java to javascript. How can i acheive the same. using loadUrl, i am passing the Java String [] to a javascript Function. (String[] StringName--> ["hello", "hi"])

But when i try to access the same in javascript

function displayString(StringName) {
    for(var i=0;i<StringName.length;i++) {
         alert("path : " + StringName[i]);
    }
}

i am expecting length to be 2 as there are only 2 items in the Java String[]. But in javascript it is cominng as a String. Whatformat i have to use to get it as an array

From Android Using WebView i have created the page and i want to send a String Array to Javascript to execute some commands. — Veena Sujith
– Veena Sujith, Commented Jun 5, 2013 at 4:11

midhunhk · Accepted Answer · 2013-06-05 04:13:47Z

2

Two ideas come to my mind. You can create a javascript array using jsp or you can use a separator for the java array and create into a string, then read back in javascript using split() on the string.

Method 1:

<% String array[] = // is your initialized array %>

<script>
var jsArray = new Array();
<% for(String element:array){
%> jsArray[jsArray.length] = <% element %>
<% } %>
</script>

This should create a ready to use Javascript array with the values contained in your Java array.

Method 2: (Using separator as #)

<% StringBuilder sb = new StringBuilder();
for(String element:array){
sb.append(element + "#");
}
%>
<script>
var temp = <% sb.toString() %>
var array = temp.split('#');
...
</script>

answered Jun 5, 2013 at 4:13

midhunhk

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1 Comment

midhunhk Over a year ago

I thought you were developing for a jsp page. Please ignore this post if you are not looking for this.

Community · Accepted Answer · 2017-05-23 12:18:04Z

1

Java to JSON and JSON to Java is fairly well covered ground.

you should check this out.

https://stackoverflow.com/questions/338586/a-better-java-json-library

edited May 23, 2017 at 12:18

CommunityBot

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answered Jun 5, 2013 at 4:08

madmik3

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Comments

Amin Sh · Accepted Answer · 2013-10-10 15:37:32Z

0

<%
    String[] jArray= new String[2];
    jArray[0]="a";
    jArray[1]="b";

    StringBuilder sb = new StringBuilder();
    for(int i=0;i<jArray.length;i++) 
        sb.append(jArray[i]+",");
%>

<script type="text/javascript">
    temp="<%=sb.toString()%>";
    var array = new Array();
    array = temp.split(',','<%=jArray.length%>');

    alert("array: "+array);
</script>

answered Oct 10, 2013 at 15:37

Amin Sh

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