javascript - 绑定到表单的进度条

问题描述

我做了这个（为了好玩和教育，我知道这不是最有效的）

我需要帮助的 JS 代码

class App extends React.Component {

validate () {
    event.preventDefault();
    var name = document.getElementById("documentName").value;
    var email = document.getElementById("email").value;
    var re = /\S+@\S+\.\S+/;
    var type = document.getElementById("documentType");
    var typeChosen = type.options[type.selectedIndex].value;
    var category = document.getElementById("category");
    var categoryChosen = category.options[category.selectedIndex].value;

    if (name.length < 2 || name.length > 32) {
        alert("Invalid name length.");
    }
    else if (typeChosen === "" || categoryChosen === "") {
        alert("Please select a value from the dropdown list.");
    }
    else if (email.length > 128) {
        alert("Email exceedes character length.")
    }
    else if (re.test(email) === false) {
        alert("Invalid email adress.");
    }

}
getValue () {
    return "";
}

fillBar () {
    return (<progress max="100" value = {this.getValue()} id="progress">
            </progress>);
}

  render() {
    return (
        <form onSubmit = {this.validate}>
         <div className = "form-progress-bar">
         {this.fillBar()}
        </div>
        <label htmlFor="documentName">Input the document name:</label>
        <br />
          <input id = "documentName"
          type="text" 
          placeholder="Document Name" 
        />
        <br />
        <label htmlFor="documentType">Select document type:</label>
        <br />
        <select className = "dropdown" id = "documentType">
        <option defaultValue = ""> </option>
        <option value = "Plain" label = "Plain" />
        <option value = "PDF" label = "PDF" />
        </select> 
        <br />
        <label htmlFor="category">Select document category:</label>
        <br />
        <select className = "dropdown" id = "category">
        <option defaultValue >  </option>
        <option value = "Audit" label = "Audit" />
        <option value = "Application" label="Application" />
        <option value = "Other" label = "Other" />
        </select>
        <br />
        <label htmlFor="email">Input your email adress:</label>
        <br />
        <input id = "email"
          type="text" 
          placeholder="Email" 
        />
        <br />
        <button id = "button">Submit</button>
      </form>
    );
  }
}

ReactDOM.render(
  <App />,
  document.getElementById('app')
);

我坚持的是每次填写表单字段时如何将进度值添加 25。

代码笔也包含 html 和 css 代码

欢迎任何帮助！

标签： javascripthtmlcssreactjs

您可以添加一个更改处理程序并使用该字段是否已填充来设置您的状态。然后在 get value 函数中，您将总结该状态中的所有真值。

例子：

state = {
    (each field)
    emailFilled: false,
}

handleChange = (stateKey) => (event) => {
    const value = event.target.value;
    this.setState({
        [stateKey]: Boolean(value),
    });
}

getValue = () => {
    let value = 0;
    if(this.state.emailFilled) {
        value += 0.25;
    }
}

...
render(){
    ...
    <input id="email"
        type="text"
        placeholder="Email"
        onChange={this.handleChange('emailFilled')}
    />
    ...
}

javascript - 绑定到表单的进度条

问题描述

解决方案

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