Detailed explanation of the use of filter() method in jquery

This time I will bring you a detailed explanation of the use of the filter() method in jquery. What are the precautions when using the filter() method in jquery. The following is a practical case, let’s take a look.

Definition and usage

The filter() method returns elements that meet certain conditions.

This method lets you specify a condition. Elements that do not meet the criteria will be removed from the selection and elements that meet the criteria will be returned.

This method is usually used to narrow the scope of searching for elements in the selected element combination.

Tip: The filter() method is opposite to the not() method.

filter() filters based on the attributes in brackets. For example: $("p").filter("p") This is not allowed. There are only some attributes in the filter brackets, or what they contain. It cannot be an element, such as "p"

//filter() --获取具有某些属性值的标签 :(指定的对象集合进行过滤)
  $("li").filter(".item-1") //获取class属性值为item-1的li元素
  $("li").filter(":even").css("background", "red"); //获取所有偶数号的li元素,并将它们的背景颜色设为红色
  $("li").filter(".item-1,#abc").css("background-color", "yellow"); //获取class属性值为item-1的所有li标签 ，同时获取id属性值为abc的所有li标签
  $("p").filter(".selected, :first");//获取class属性值为selected的所有P标签，同时获取第一个P标签
//:contains() --获取标签里包含了某些文字的标签 (contains是判断文本的)
  //jQuery:has()和jQuery:contains()两个方法比较类似。不同点在于：has是判断标签的 contains是判断文本的
  $("p p:contains('测试')").text(); //获取p标签下包含“测试”的p标签的text值 //打印一下，结果为“测试1 测试2”
  //alert($("p").contains("测试").text()); //不能这么用，提示错误“contains不是一个函数”

html

<p class="model_content" style="">
      <p class="model_content_search layui-bg-gray">
        <form class="layui-form">
          <p class="layui-form-item fl" style="margin-top: 15px;">
            <label class="layui-form-label" style="width:66px;">选择框</label>
            <p class="layui-input-inline" style="width:174px;">
              <input id="search_val" class="layui-input" name="keyword" type="text" placeholder="请输入关键字">
            </p>
          </p>
          <p class="layui-input-inline fl" style="margin-top: 15px;">
            <button class="layui-btn">搜索</button>
          </p>
          <p class="clear"></p>
        </form>
      </p>
      <p class="search_result">
        <p class="mapAddress">
          <ul>
            <li>
              <p class="addressInfo">
                <h3>要素大市场</h3>
                <span class="bold">地址：</span>徽州大道与锦绣大道交叉口<br>
              </p>
            </li>
            <li>
              <p class="addressInfo">
                <h3>锦绣大道</h3>
                <span class="bold">地址：</span>徽州大道与锦绣大道交叉口<br>
              </p>
            </li>
            <li>
              <p class="addressInfo">
                <h3>蜀山区</h3>
                <span class="bold">地址：</span>徽州大道与锦绣大道交叉口<br>
              </p>
            </li>
            <li>
              <p class="addressInfo">
                <h3>瑶海区</h3>
                <span class="bold">地址：</span>徽州大道与锦绣大道交叉口<br>
              </p>
            </li>
          </ul>
        </p>
      </p>
    </p>
 //input中输入筛选
    var $sub2 = $("#search_val");
    $sub2.on("input", function () {
      var $iptVal2 = $sub2.val();
      $(".mapAddress li").hide();
      $(".mapAddress .addressInfo h3").filter(":contains('" + $iptVal2 + "')").parents("li").show();
    });

I believe you have mastered the method after reading the case in this article, and there will be more exciting things. Please pay attention to other related articles on php Chinese website!

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