Problems and solutions related to passing variable parameters in JavaScript calls

Problems and solutions related to passing variable parameters in JavaScript calls_javascript skills

WBOY

Release： 2016-05-16 15:34:27

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Example

There is a js method that receives parameters:

Copy code The code is as follows:

function f1(myValue){ alert(myValue); }

has a variable:

Copy code The code is as follows:

var passValue="Hello World";

When calling this method (I appear when Ajax submits):

@Ajax.ActionLink("Text","Controller",new{parameter},new AjaxOptions(){ HttpMethod="post",OnSuccess="f1(PassValue)" })

Pay attention to the last OnSuccess here. If you throw the variable directly, the variable will be considered a string

It won’t work if you change it to OnSuccess="f1(" PassValue ")"

After searching, it turns out that escape characters are needed

OnSuccess="f1('" PassValue "')"

That’ll be fine

But I didn’t pay attention when calling Ajax above. This is just to pass parameters to the asynchronous calling method f1()

So there is no need for @Ajax. Just change it to a normal A tag. Otherwise, the controller will be called twice

ps:js calls the method as a parameter

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  <title>js调用</title>  
  <script src="cssjs/jquery.js" type="text/javascript"></script>
  <script type="text/javascript">
    $().ready(function () {
      $.dialog = function (settings) {
        if ($.isFunction(settings.okCallback)) {
          if (settings.height == null) {
            if (settings.okCallback.apply() != false) {
              alert("1");
            }
          } else {
            
            if (settings.okCallback.call(this, settings.height) != false) {
              alert("2");
            }
            
            /*
            if (settings.okCallback.apply(this, arguments) != false) {
              alert("2");
            }
            */
          }
        }
      }
    });    
  </script>
  <script type="text/javascript">
    $(function () {
      $.dialog({
        okCallback: print,
        height: {data:"你好"}
      });
    });
  function print(ee1) {
    alert("print(ee1)");
    
    alert(ee1.data);
    
    /*
    alert(ee1.height.data);
    */
  /*
  function print(a, b, c, d) {
  alert(a + b + c + d);
  }
  function example(a, b, c, d) {
  //用call方式借用print,参数显式打散传递
  print.call(this, a, b, c, d);
  //用apply方式借用print, 参数作为一个数组传递,
  //这里直接用JavaScript方法内本身有的arguments数组
  print.apply(this, arguments);
  //或者封装成数组
  print.apply(this, [a, b, c, d]);
  }
  //下面将显示"背光脚本"
  example("背", "光", "脚", "本"); 
  */
  </script>
</head>
<body> 
</body>
</html>

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