How to globally replace div values ​​in Vue (detailed steps)

Vue.js is a popular progressive JavaScript framework that allows you to easily build interactive user interfaces. In Vue.js, we usually use directives to modify the state of components. However, sometimes we need to globally replace certain values ​​across the entire DOM tree, especially when we are making some visually large-scale changes.

This article will introduce how to use Vue.js to globally replace the value of a div in the entire DOM.

Step 1: Create a Vue instance

First, we need to create a simple Vue instance and bind it to a DOM element. We can create an empty div element in HTML and set it as the root element of our Vue instance.

<div id="app"></div>

Then, in JavaScript, we need to create a Vue instance by passing in an options object. We store the data in a property called message which will be used throughout the application.

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  }
})

Now, we have created a simple Vue instance and bound it to the div element with the id "app". Next, we'll learn how to globally replace the value of a div.

Step 2: Use Vue instructions to replace the value of div

Vue provides many instructions to modify elements in the template. One of the most commonly used directives is v-text, which allows us to insert a string value directly into an element.

We can create a div element in HTML and replace its value using the v-text directive. We set the ID of the div element to "mydiv".

<div id="mydiv" v-text="message"></div>

Now we have created a div element that displays "Hello Vue!" and used the v-text directive to replace it with the message data attribute in our Vue instance.

However, this can only replace one div. What if we want to globally replace the value of every div in the entire DOM?

Step 3: Create a global replacement function

In order to globally replace the value of the div, we need to write a recursive function that traverses the entire DOM tree and replaces it with the data attributes of our example Vue instance The value of each div.

function replaceDivs(el) {
  if (el.tagName === 'DIV') {
    el.textContent = app.message
  }
  Array.from(el.children).forEach(replaceDivs)
}

This is a very simple recursive function that will check if the element passed to it is a div element. If so, the text content of that element is set to the message property of our Vue instance. We will then use Array.from(el.children) to iterate over all the children under that element and call the replaceDivs function recursively for each child.

Step 4: Call the global replacement function

Now, we are ready to call the replaceDivs function in our application. We can call this function in the mounted lifecycle hook of the Vue instance to ensure that its value is replaced after the DOM tree is fully loaded.

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  },
  mounted: function () {
    replaceDivs(document.body)
  }
})

Now, in the mounted lifecycle hook of the Vue instance, we will call the replaceDivs function, passing document.body as a parameter. This will run the function and apply it to the entire DOM tree.

Conclusion

Now, we have learned how to globally replace the value of a div using Vue.js. We created a simple Vue instance, modified the value of a single div using the v-text directive, and then wrote a recursive function to globally replace the div's value.

Vue.js is very important for developers who write interactive front-ends. It provides a simple yet powerful toolset that helps us create complex applications and easily modify the state of elements throughout the DOM tree.

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