Get parameters using EL expression

This time I will introduce to you the use of EL expressions to obtain parameters. What are the precautions for using EL expressions to obtain parameters? The following is a practical case, let's take a look.

1. Action returns 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 expressions in js to obtain parameter values

<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: Take numeric parameter value, EL expression in js does not need to be quoted; take string parameter value, in js EL expressions 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!

Recommended reading:

What are the ways to make an Observer in Vue

Summary of Angular server-side rendering methods

The above is the detailed content of Get parameters using EL expression. For more information, please follow other related articles on the PHP Chinese website!