How to implement ajax comment function without refreshing

This time I will show you how to implement ajax without refreshing the comment function. What are the precautions for ajax to implement the non-refresh comment function. The following is a practical case, let's take a look.

This is the interface of the message board. When the user clicks to submit a message, it will be automatically submitted to my message.

The message content is empty, or there is a gray "No message content is filled in" A pop-up message will pop up, please fill in the message content. When the user fills in the information, the number of words in the current message will be displayed in the lower right corner.

The following is the code of javascript

//去掉左右尖括号 并用去掉空格后的字符串替代显示 
function replaceBrackets(id) { 
  var inputValue = $("#" + id).val(); 
  while (inputValue.indexOf("<") != -1) { 
    inputValue = inputValue.replace("<", "["); 
  } 
  while (inputValue.indexOf(">") != -1) { 
    inputValue = inputValue.replace(">", "]"); 
  } 
  while (inputValue.indexOf("&") != -1) { 
    inputValue = inputValue.replace("&", " "); 
  } 
  $("#" + id).val(inputValue); 
} 
 
function replaceChar(name, char) { 
  var inputValue = $("#" + name).val(); 
  while (inputValue.indexOf(char) != -1) { 
    inputValue = inputValue.replace(char, ""); 
  } 
  return inputValue; 
} 
 
$("#txtMessage").blur(function () { 
  $("#txtMessage").val(replaceChar("txtMessage", "<!--")); 
  if ($("#txtMessage").val() == "") { 
    document.getElementById("txtMessage").style.color = "#8C8C8C"; 
    $("#txtMessage").val("没有填写留言内容"); 
    return false; 
  } 
  replaceBrackets("txtMessage"); 
  return true; 
}); 
 
$("#txtMessage").focus(function () { 
  if ($("#txtMessage").val() == "没有填写留言内容") { 
    document.getElementById("txtMessage").style.color = "#000000"; 
    $("#txtMessage").val(""); 
  } 
}); 
 
function txtanum(id, name)  //统计txta的输入字数 
{ 
  var maxl = 151; 
  var num = 150; 
  var content = $("#" + id).val(); 
  content.slice(0, maxl); 
  var nowlength = content.length; 
  if (nowlength >= 0) { 
    if (nowlength < num) 
      $("#" + name).text(nowlength); 
    else 
      $("#" + name).text(num); 
  } else 
    $("#" + id).val(content.substring(0, maxl - 1)); 
 
  if (nowlength == 0) 
    $("#" + name).text(0); 
 
  if (nowlength > num) 
    $("#" + id).val(content.substring(0, num)); 
} 
 
 
var isSubmit = false; 
$('#subMessage').click(function () { 
 
  if (isSubmit) { 
    return; 
  } 
  isSubmit = true; 
  if ($("#txtMessage").val() == "没有填写留言内容" || $.trim($("#txtMessage").val()) == "") { 
    alert("请输入留言内容！"); 
    isSubmit = false; 
    return; 
  } 
  $.ajax({ 
    type: "POST", 
    url: app_param.path_context+"/user/member/msgboard/save", 
    data: { "context": ($("#txtMessage").val()) }, 
    error: function () { 
      isSubmit = false; 
    }, 
    success: function (data) { 
      if (data) { 
        addRow(data); 
        isSubmit=false; 
       $('#zanwu').hide(); 
        document.getElementById("txtMessage").style.color = "#8C8C8C"; 
    $("#txtMessage").val("没有填写留言内容"); 
      }  
    } 
  }); 
  function addRow(messageboard) { 
    var table = $("#tblmsg"); 
    var html = []; 
    html.push("<tr>"); 
    html.push("<td class=&#39;m_time&#39;>"); 
    html.push(messageboard.createDate); 
    html.push("</td>"); 
    html.push("<td>"); 
    html.push(messageboard.context); 
    html.push("</td>"); 
    html.push("<td style=&#39;border-right: 0;&#39; class=&#39;m_order_procz&#39;>"); 
    html.push("<a class=&#39;xxx&#39; href=&#39;messagereply/"+messageboard.id+"&#39;>查看</a>"); 
    html.push("</td>"); 
    html.push("</tr>"); 
    html = html.join(''); 
    table.append(html); 
  } 
 
});

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to php Other related articles on the Chinese website!

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