How do I pass an array to a Spring controller method with jquery ajax
Solution 1
Try changing your RequestParam annotation value to this:
@RequestParam(value="objectValues[]", required=false)
If this solves the problem, then it is due to a parameter naming incompatibility between Spring and jQuery, where jQuery wants to put square brackets in to indicate that a parameter is an array (I think PHP likes this too), but where Spring doesn't care. To see the reverse try setting the "data" parameter of the ajax request to the string: 'objectValues=1234567890&objectValues=0987654321'
Solution 2
There are multiple ways to do this, depending on which component you think is sending or receiving data in the incorrect format (or which component you have access to modify).
If you believe the default way that jQuery sends data is correct, modify your controller appropriately (note you'll need to change both on the method signature and the annotation if you use both):
@RequestMapping(value = "/location", method=RequestMethod.GET, params="objectValues[]")
public @ResponseBody String loadLocation(@RequestParam(value="objectValues[]", required=false) String[] objectValues) {
...
}
If you believe Spring functions correctly, but data sent from jQuery is incorrect, modify jQuery:
$.ajax({
traditional: true,
...
});
See more on jQuery AJAX settings for the traditional
setting.
I myself think it is cleaner to modify the way jQuery sends data; it keeps my Controller syntax looking like I want.
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coder
Updated on May 27, 2022Comments
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coder almost 2 years
Here's my ajax call:
$.ajax({ type: 'GET', url: contextPath + '/test/location', data: {'objectValues': object.objectValues }, datatype: 'json', success: function( data ) { var obj = jQuery.parseJSON( data ); } });
it gives me this URL:
http://localhost:8080/test/location?objectValues[]=1234567890&objectValues[]=0987654321
My Spring method signature looks like this:
@RequestMapping(value = "/location", method=RequestMethod.GET) public @ResponseBody String loadLocation(@RequestParam(value="objectValues", required=false) String[] objectValues)
Why do I keep getting null for the value of objectValues?
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coder about 13 yearssame result...since this is your suggestion, can I assume that everything else looks right?
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Patricia about 13 yearsi've never worked with spring, but i had trouble with asp.net mvc and jquery not playing nice with arrays/objects. setting it to true makes the query string the same still?
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Drazen Bjelovuk over 9 yearsAlternatively, you can set
traditional: true
in your Ajax call. -
gene b. almost 5 yearsWorked for me too... without the
@RequestParam(value="array[]")
it was setting a NULL into the String[] parameter.