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Access model object with JSTL

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2018 | 作者 红领巾 ] 0人收藏点击收藏

I'm currently trying to get to grips with AJAX, and have a problem accessing the model object.

What my test code does is get the value of the selected from a drop down list, when the button is pressed it passes this value to AjaxTest() , which attaches the param to the model, but I can't get seem to output the model object - I was wondering why this might be?

There is definitely a value for param .

<div id="result"></div> <script type="text/javascript"> var param = document.getElementById("blah").value; var loadUrl = "/ajax/" + param; $("#button").click(function(){ $.post(loadUrl, function(data){ alert("Data Loaded: " + data); $("#result").html("<p>Param: ${output}</p>"); }); }); </script> @RequestMapping(value = "/ajax/{param}", method = RequestMethod.POST) public @ResponseBody String AjaxTest(@PathVariable String param, final ModelMap model){ model.addAttribute("output", param); return param; }

I think you are getting a bit mixed up with what is client side and server side. You java looks correct, but your js is trying to access a jstl expression ( ${output} ). The jstl expression won't resolve when the page is rendered, which will be before the Ajax request/response has happened.

Your js needs to work with the variable 'data' which is the data that your java adds to the model. Something like this:

$("#result).html("<p>Param: " + data.output + "</p>");

This assumes the model is json Hope this helps

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