javascript 如何将数组从java传递给javascript
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How to pass array from java to javascript
提问by Veena Sujith
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"])
我想将字符串数组从 java 传递给 javascript。我怎样才能达到同样的目标。使用 loadUrl，我将 Java 字符串 [] 传递给 javascript 函数。(String[] StringName--> ["hello", "hi"])
But when i try to access the same in javascript
但是当我尝试在 javascript 中访问相同的内容时
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
我期望长度为 2，因为 Java String[] 中只有 2 个项目。但在 javascript 中，它是作为字符串出现的。我必须使用什么格式才能将其作为数组
回答by midhunhk
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.
我想到了两个想法。您可以使用 jsp 创建一个 javascript 数组，或者您可以使用 java 数组的分隔符并创建一个字符串，然后在字符串上使用 split() 在 javascript 中读回。
Method 1:
方法一：
<% String array[] = // is your initialized array %>
<% 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.
这应该使用 Java 数组中包含的值创建一个随时可用的 Javascript 数组。
Method 2: (Using separator as #)
方法2：（使用分隔符作为#）
<% StringBuilder sb = new StringBuilder();
for(String element:array){
sb.append(element + "#");
}
%>
<script>
var temp = <% sb.toString() %>
var array = temp.split('#');
...
</script>
回答by madmik3
Java to JSON and JSON to Java is fairly well covered ground.
Java to JSON 和 JSON to Java 是相当广泛的领域。
you should check this out.
你应该检查一下。
https://stackoverflow.com/questions/338586/a-better-java-json-library
https://stackoverflow.com/questions/338586/a-better-java-json-library
回答by Amin Sh
<%
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>
