键入时如何设置文本输入的样式? [英] How can I style text input as I type?

问题描述

每次我在输入字段中键入一个字符时，我都会解析表达式以便得到:

1. 令牌数组，即tokenArray = [2，*，COS，(，4，)]
2. 相应的令牌类型数组，即tokenType = [NUMBER，OPERATOR，FUNCTION，(，NUMBER，)]

我需要根据每个令牌的令牌类型设置其样式(例如，为每个令牌分配不同的颜色).

我已经能够轻松地将输入文本的动态副本设置为不同的<div>样式(不是输入文本本身，这是我要帮助的内容)，如下所示:

JavaScript:

 function processExpression() {
    var userInput = document.getElementById('inputText').value;

        var resultOutput =  parse(userInput); //this generates the two arrays described above

        for (i in tokenArray) 
          newHTML += "<span style='color: " + colorMap[ tokenType[i] ] + " '>" +  tokenArray[i] + "</span>";

          document.getElementById('styledExpression').innerHTML = newHTML; 
}
 

HTML:

 <input type="text" id="inputText" value="" placeholder="Type expression" size="40"
        onKeyDown="processExpression();" 
        onKeyUp="processExpression();"/>

<div id="styledExpression" value=""></div>
 

如何在输入的输入字段中直接设置输入文字的样式? 任何JavaScript解决方案?

更新

蒂姆对问题的答案在contenteditable div中替换innerHTML 提供了一些很好的帮助.

您将如何修改 http://jsfiddle.net/2rTA5/2/来解决在每次击键时都会重新解析整个可编辑内容?例如，假设您键入"= if(AND(3 = 2，A1:A4，OR(0,1))，5,6)"，然后在每次击键时都以编程方式重写可编辑项(请参见上面的令牌描述) )，然后我失去了光标.

此解决方案如何忽略令牌，字符或节点的类型，而仅保存和恢复键击之前的绝对光标(从的开头)?

解决方案

文本输入不支持样式化的内容.故事结束.

常见的解决方案是改用 contenteditable ./p>

Every time I type a character in an input field, I parse the expression so that I get:

1. An array of tokens, i.e., tokenArray=[2, *, COS, (, 4, )]
2. A corresponding array of token types, i.e., tokenType=[NUMBER, OPERATOR, FUNCTION, (, NUMBER, )]

I need to style each token (for instance assigning a different color to each token) based on its respective token type.

I have been able to easily style a dynamic copy of the input text in a different <div> (not the input text itself, which is what I am asking for help) as follows:

JavaScript:

function processExpression() {
    var userInput = document.getElementById('inputText').value;

        var resultOutput =  parse(userInput); //this generates the two arrays described above

        for (i in tokenArray) 
          newHTML += "<span style='color: " + colorMap[ tokenType[i] ] + " '>" +  tokenArray[i] + "</span>";

          document.getElementById('styledExpression').innerHTML = newHTML; 
}

HTML:

<input type="text" id="inputText" value="" placeholder="Type expression" size="40"
        onKeyDown="processExpression();" 
        onKeyUp="processExpression();"/>

<div id="styledExpression" value=""></div>

How can I style the input text directly in the input field where I type? Any JavaScript solution?

UPDATE

Tim's answer to the question replace innerHTML in contenteditable div provides some good help.

How would you modify http://jsfiddle.net/2rTA5/2/ to solve for when at every keydown, one reparses the entire editable? For example, imagine you type "=if(AND(3=2,A1:A4,OR(0,1)),5,6)" and, at every keydown the editable gets programmatically re-written (see token description above) and I lose the cursor.

How can this solution ignore the type of token or character or node and simply save and restore the absolute cursor (from the beginning of the ) position that was before the keydown?

解决方案

Text inputs do not support styled content. End of story.

A common solution is to use contenteditable instead.

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