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This time I will show you how EL obtains the context parameter value (with code). What are the precautions for EL to obtain the context parameter value? The following is a practical case, let's take a look.
1. actionReturn parameters to the page
/** * 测试js中获取后台传值 * @param model * @param req * @return String */ @RequestMapping("getValue") public String getValue(Model model, HttpServletRequest req){ model.addAttribute("stringValue", "测试在js中取值..."); model.addAttribute("numberValue", 111); List<String> list = new ArrayList<String>(); list.add("aaa"); list.add("bbb"); list.add("ccc"); model.addAttribute("arrayValue", list); model.addAttribute("jsonStringValue", JSON.toJSONString(list)); User user = new User(); user.setUserID("1"); user.setUserName("test"); user.setMobile("13800000000"); user.setEmail("test@163.com"); user.setNickName("test"); model.addAttribute("objJsonString", JSON.toJSONString(user)); return "/getValue.htm"; }
2. Use EL in js ExpressionGet the parameter value
<script type="text/javascript"> $(function(){ var stringValue = '${stringValue}'; console.log('stringValue-------------' + stringValue); var numberValue = ${numberValue}; console.log('numberValue-------------' + numberValue); var jsonStringValue = ${jsonStringValue}; console.log('jsonValue---------------' + jsonStringValue); var jsonStringValue1 = '${jsonStringValue}'; console.log('jsonValue1---------------' + jsonStringValue1); var objJsonString = '${objJsonString}'; console.log("objJsonString------------------- " + objJsonString); var obj = JSON.parse(objJsonString); console.log("userName ------------ " + obj.userName); }); </script>
Remarks: Get the numeric parameter value, not used in EL expressions in js Add quotation marks; take the string type parameter value. EL expressions in js need to be quoted; object and collection type parameter values need to be converted using JSON.toJSONString() in the background.
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
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