How to solve the problem of ajax data parameter error causing page crash-JS Tutorial-php.cn

How to solve the problem of ajax data parameter error causing page crash

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Release： 2018-06-01 14:17:01

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This time I will show you how to solve the problem of page crash caused by ajax data parameter error, and how to solve the problem of page crash caused by ajax data parameter error. What are the precautions?The following is a practical case, let's take a look .

The code is as follows:

$('.icon-edit').click(function (event) {  这是一个按钮
    o=$('.icon-edit').index($(this))+1;
    edit.style.display='block';
    //console.log('$(this)',$(this).parent().parent());
    let message=$(this).parent().parent();
    $("#non").val(message.children('td:eq(0)').html());
    $("#name").val(message.children('td:eq(1)').html());
    $("#sex").val(message.children('td:eq(2)').html());
    $("#age").val(message.children('td:eq(3)').html());
    $("#xueyuan").val(message.children('td:eq(4)').html());
    $("#grade").val(message.children('td:eq(5)').html());
    $("#phone").val(message.children('td:eq(6)').html());
    $("#room").val(message.children('td:eq(7)').html());
    l=message.children('td:eq(0)').html();
  });
  $('#ok').click(function () {
    //event.stopImmediatePropagation();
    let text=$('table');
    id=$('#non').val();
    username=$('#name').val();
    sex=$('#sex').val();
    age=$('#age').val();
    institute=$('#xueyuan').val();
    grade=$('#grade').val();
    phone=$('#phone').val();
    hlbhl=$('#room').val()
    text.find("tr:eq("+o+")").children('td:eq(0)').text(id);
    text.find("tr:eq("+o+")").children('td:eq(1)').text(username);
    text.find("tr:eq("+o+")").children('td:eq(2)').text(sex);
    text.find("tr:eq("+o+")").children('td:eq(3)').text(age);
    text.find("tr:eq("+o+")").children('td:eq(4)').text(institute);
    text.find("tr:eq("+o+")").children('td:eq(5)').text(grade);
    text.find("tr:eq("+o+")").children('td:eq(6)').text(phone);
    text.find("tr:eq("+o+")").children('td:eq(7)').text(hlbhl);
    $.ajax({
      type: "POST",
      url: "doAction2.php",//请求的后台地址
      data: {
            non:o,
            id: id,
            username: username,
            sex: sex,
            age: age,
            institute: institute,
            grade: grade,
            phone: phone,
            hlbhl: hlbhl
      },//前台传给后台的参数
      dataType: "json",
      ansync: true,
      ContentType: "application/json; charset=utf-8",
      success: function (msg) {//msg:返回值
        a=2;
        console.log(a);
      }
    });
    edit.style.display='none';
  });

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The general idea of the code is that I click a button ($('.icon-edit')) and then a form (edit) pops up. The form is the data derived from the click. Then modify the content of the table grid
and click the OK button ($('#ok')) to overwrite the form data with the data of the previously clicked row to achieve the purpose of modifying the table. When OK is clicked, ajax is triggered. ,
Send the modified data to the backend, get the data and update the database.

The result page did not report an error, but crashed directly. After checking for a long time, I found that the data parameter of ajax was written incorrectly. It was written like this before:

    id=text.find("tr:eq("+o+")").children('td:eq(0)').text(id);
    username=text.find("tr:eq("+o+")").children('td:eq(1)').text(username);
    sex=text.find("tr:eq("+o+")").children('td:eq(2)').text(sex);
    age=text.find("tr:eq("+o+")").children('td:eq(3)').text(age);
    institute=text.find("tr:eq("+o+")").children('td:eq(4)').text(institute);
    grade=text.find("tr:eq("+o+")").children('td:eq(5)').text(grade);
    phone=text.find("tr:eq("+o+")").children('td:eq(6)').text(phone);
    hlbhl=text.find("tr:eq("+o+")").children('td:eq(7)').text(hlbhl);
    $.ajax({
      type: "POST",
      url: "doAction2.php",//请求的后台地址
      data: {
            non:o,
            id: id,
            username: username,
            sex: sex,
            age: age,
            institute: institute,
            grade: grade,
            phone: phone,
            hlbhl: hlbhl
      },//前台传给后台的参数
      dataType: "json",
      ansync: true,
      ContentType: "application/json; charset=utf-8",
      success: function (msg) {//msg:返回值
        a=2;
        console.log(a);
      }
    });
    edit.style.display='none';
  });

Copy after login

As can be seen from the above, The data I pass to data is not string or the like, but a n.fn.init [td, prevObject: n.fn.init(1), context: document],
Due to my carelessness and little understanding of the situations that caused ajax errors, I found out the cause after reading the code for a long time. At first, I thought it would not be caused by parameters.
Because I thought the parameters were wrong. The data I got was wrong, the report was wrong or the results were different. As expected, I was still too young.

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!