代码编辑器:
x
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<form action="/dy/html/getpost">
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搜索: <input type="search" id="mySearch" name="filter" required>
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<input type="submit">
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</form>
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<p>点击 "点我" 按钮查看在表单提交前搜索字段是否为必填字段</p>
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<button onclick="myFunction()">点我</button>
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<p id="demo"></p>
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<script>
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function myFunction() {
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var x = document.getElementById("mySearch").required;
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document.getElementById("demo").innerHTML = x;
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}
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</script>
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